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Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7017 • www.exar.com SP3223E/EB/EU_101_062712
SP3223E/EB/EU
Intelligent +3.0V to +5.5V RS-232 Transceivers
FEATURES
• Meets true EIA/TIA-232-F Standards
from a +3.0V to +5.5V power supply
• Interoperable with EIA/TIA-232 and
adheres to EIA/TIA-562 down to a +2.7V
power source
• AUTO ON-LINE® circuitry automatically
wakes up from a 1µA shutdown
• Minimum 250Kbps data rate under load
(EB)
• 1 Mbps data rate for high speed RS-232
(EU)
• Regulated Charge Pump Yields Stable
RS-232 Outputs Regardless of VCC
Variations
• ESD Specications:
+15KV Human Body Model
+15KV IEC61000-4-2 Air Discharge
+8KV IEC61000-4-2 Contact Discharge DESCRIPTION
SELECTION TABLE
Now Available in Lead Free Packaging
V-
1
2
3
417
18
19
20
5
6
7
16
15
14
SHUTDOWN
C1+
V+
C1-
C2+
C2-
ONLINE
EN
R
1
IN
GND
Vcc
T
1
OUT
STATUS
8
9
10 11
12
13
R
2
IN
R
2
OUT
SP3223E
T
2
OUT T
1
IN
T
2
IN
R
1
OUT
The SP3223 products are RS-232 transceiver solutions intended for portable applications
such as notebook and hand held computers. These products use an internal high-efciency,
charge-pump power supply that requires only 0.1µF capacitors in 3.3V operation. This charge
pump and Exar's driver architecture allow the SP3223 series to deliver compliant RS-232
performance from a single power supply ranging from +3.3V to +5.0V. The SP3223 is a 2-
driver/2-receiver device ideal for laptop/notebook computer and PDA applications.
The AUTO ON-LINE® feature allows the device to automatically "wake-up" during a shut-
down state when an RS-232 cable is connected and a connected peripheral is turned on.
Otherwise, the device automatically shuts itself down drawing less than 1µA.
Device Power
Supplies
RS- 232
Drivers
RS-232
Receivers
AUTO ON-LINE ® TTL
3-state
Data Rate
(kbps)
SP3223E +3.0V to +5.5V 2 2 YES YES 120
SP3223EB +3.0V to +5.5V 2 2 YES YES 250
SP3223EU +3.0V to +5.5V 2 2 YES YES 1000
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7017 • www.exar.com SP3223E/EB/EU_101_062712
2
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation
of the device at these ratings or any other above those
indicated in the operation sections of the specications
below is not implied. Exposure to absolute maximum
rating conditions for extended periods of time may
affect reliability and cause permanent damage to the
device.
VCC.......................................................-0.3V to +6.0V
V+ (NOTE 1).......................................-0.3V to +7.0V
V- (NOTE 1)........................................+0.3V to -7.0V
V+ + |V-| (NOTE 1)...........................................+13V
ICC (DC VCC or GND current).........................+100mA
Input Voltages
TxIN, ONLINE,
SHUTDOWN, EN......................-0.3V to VCC + 0.3V
RxIN...................................................................+15V
Output Voltages
TxOUT.............................................................+13.2V
RxOUT, STATUS.......................-0.3V to (VCC + 0.3V)
Short-Circuit Duration
TxOUT.....................................................Continuous
Storage Temperature......................-65°C to +150°C
Power Dissipation per package
20-pin SSOP (derate 9.25mW/oC above +70oC)..750mW
20-pin TSSOP (derate 11.1mW/oC above +70oC..900mW
NOTE 1: V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V.
Unless otherwise noted, the following specications apply for VCC = +3.0V to +5.5V with TAMB = TMIN to TMAX.
Typical values apply at VCC = +3.3V or +5.0V and TAMB = 25°C (Note 2).
ELECTRICAL CHARACTERISTICS
NOTE 2: C1 - C4 = 0.1µF, tested at 3.3V ±10%.
C1 = 0.047µF, C2-C4 = 0.33µF, tested at 5V±10%.
PARAMETER MIN. TYP. MAX. UNITS CONDITIONS
DC CHARACTERISTICS
Supply Current,
AUTO ON-LINE®
1.0
10 µA
All RxIN open, ONLINE = GND,
SHUTDOWN = Vcc, TxIN = Vcc or
GND, Vcc = +3.3V, TAMB = +25ºC
Supply Current, Shutdown 1.0 10 µA
SHUTDOWN = GND, TxIN =
Vcc or GND, Vcc = +3.3V, TAMB =
+25ºC
Supply Current,
AUTO ON-LINE® Disabled
0.3 1.0 mA ONLINE = SHUTDOWN = Vcc, No
Load, Vcc = +3.3V, TAMB = +25ºC
LOGIC INPUTS AND RECEIVER OUTPUTS
Input Logic Threshold
LOW
HIGH
GND
2.0
0.8
Vcc
V
Vcc = 3.3V or 5.0V,
TxIN, EN, SHUTDOWN, ONLINE
Input Leakage Current +/-0.01 +/-1.0 µA TxIN, EN, ONLINE, SHUTDOWN,
TAMB = +25ºC, Vin = 0V to Vcc
Output Leakage Current +/-0.05 +/-10 µA Receivers disabled, Vout = 0V to
Vcc
Output Voltage LOW 0.4 V IOUT = 1.6mA
Output Voltage HIGH Vcc - 0.6 Vcc - 0.1 V IOUT = -1.0mA
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Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7017 • www.exar.com SP3223E/EB/EU_101_062712
Unless otherwise noted, the following specications apply for VCC = +3.0V to +5.5V with TAMB = TMIN to TMAX.
Typical values apply at VCC = +3.3V or +5.0V and TAMB = 25°C (Note 2).
ELECTRICAL CHARACTERISTICS
NOTE 2: C1 - C4 = 0.1µF, tested at 3.3V ±10%.
C1 = 0.047µF, C2-C4 = 0.33µF, tested at 5V±10%.
PARAMETER MIN. TYP. MAX. UNITS CONDITIONS
Driver Outputs
Output Voltage Swing
+/-5.0 +/-5.4 V
All Driver outputs loaded with 3kΩ
to GND, TAMB = +25ºC
Output Resistance 300 Ω Vcc = V+ = V- = 0V, Vout = +/-2V
Output Short-Circuit Current +/-35 +/-60 mA Vout = 0V
Output Leakage Current +/-25 µA Vcc = 0V or 3.0V to 5.5V, Vout =
+/-12V, Driver disabled
RECEIVER INPUTS
Input Voltage Range
-15 +15 V
Input Threshold LOW 0.6 1.2 V Vcc = 3.3V
Input Threshold LOW 0.8 1.5 V Vcc = 5.0V
Input Threshold HIGH 1.5 2.4 V Vcc = 3.3V
Input Threshold HIGH 1.8 2.4 V Vcc = 5.0V
Input Hysteresis 0.3 V
Input Resistance 3 5 7 k Ω
AUTO ON-LINE® CIRCUITRY CHARACTERISTICS (ONLINE = GND, SHUTDOWN = Vcc)
STATUS Output Voltage LOW 0.4 V IOUT = 1.6mA
STATUS Output Voltage HIGH Vcc - 0.6 V IOUT = -1.0mA
Receiver Threshold to Drivers
Enabled (tONLINE)
200 µs Figure 15
Receiver Positive or Negative
Threshold to STATUS HIGH
(tSTSH)
0.5 µs Figure 15
Receiver Positive or Negative
Threshold to STATUS LOW
(tSTSL)
20 µs Figure 15
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Unless otherwise noted, the following specications apply for VCC = +3.0V to +5.5V with TAMB = TMIN to TMAX.
Typical values apply at VCC = +3.3V or +5.0V and TAMB = 25°C.
TIMING CHARACTERISTICS
PARAMETER MIN. TYP. MAX. UNITS CONDITIONS
Maximum Data Rate
SP3223E 120 235
kbps
RL = 3kΩ, CL = 1000pF, One
Driver active
SP3223EB 250
SP3223EU 1000 RL = 3kΩ, CL = 250pF, One Driver
active
Receiver Propagation Delay
tPHL and tPLH 0.15 µA Receiver input to Receiver output,
CL = 150pF
Receiver Output Enable Time 200 ns Normal Operation
Receiver Output Disable Time 200 ns Normal Operation
Driver Skew
E, EB 100 500 ns │tPHL - tPLH│, TAMB = 25°C
EU 50 100 ns
Receiver Skew
E, EB, EU 200 1000 ns │tPHL - tPLH│
Transition-Region Slew Rate
E, EB 30
V/µs
Vcc = 3.3V, RL = 3kΩ, TAMB =
25°C, measurements taken from
-3.0V to +3.0V or +3.0V to -3.0V
EU 90
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Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7017 • www.exar.com SP3223E/EB/EU_101_062712
Figure 1. SP3223E Typical Operating Circuit
TYPICAL OPERATING CIRCUIT
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Unless otherwise noted, the following performance characteristics apply for VCC = +3.3V, 250Kbps data rate, all
drivers loaded with 3kΩ, 0.1µF charge pump capacitors, and TAMB = +25°C.
TYPICAL PERFORMANCE CHARACTERISTICS
Figure 2. Transmitter Output Voltage VS. Load
Capacitance for the SP3223EB
Figure 3. Slew Rate VS. Load Capacitance for the
SP3223EB
30
25
20
15
10
5
00 500 1000 2000 3000 4000 5000
Load Capacitance (pF)
- Slew
+ Slew
1 Transmitter at 250Kbps
1 Transmitter at 15.6Kbps
All drivers loaded 3K + Load Cap
35
30
25
20
15
10
5
0
Load Capacitance (pF)
0 1000 2000 3000 4000 5000
250Kbps
125Kbps
20Kbps
1 Transmitter at 250Kbps
1 Transmitter at 15.6Kbps
All drivers loaded 3K + Load Cap
Figure 4. Supply Current VS. Load Capacitance
when Transmitting Data for the SP3223EB
Figure 5. Supply Current VS. Supply Voltage for
the SP3223EB
20
15
10
5
02.7 3 3.5 4 4.5 5
Supply V oltage (V
DC
)
1 Transmitter at 250Kbps
2 Transmitters at 15.6Kbps
All drivers loaded with 3K // 1000pF
Figure 6. Transmitter Output Voltage VS. Supply
Voltage for the SP3223EB
6
4
2
0
-2
-4
-6 0 1000 2000 3000 4000 5000
TxOUT +
TxOUT -
Load Capacitance (pF)
6
4
2
0
-2
-4
-6 2.7 3 3.5 4 4.5 5
Supply V oltage (V
DC
)
Tx OUT -
Tx OUT +
Supply Voltage (Vdc)
Supply Voltage (Vdc)
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Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7017 • www.exar.com SP3223E/EB/EU_101_062712
Unless otherwise noted, the following performance characteristics apply for VCC = +3.3V, 1000Kbps data rate, all
drivers loaded with 3kΩ, 0.1µF charge pump capacitors, and TAMB = +25°C.
Figure 8. Transmitter Output Voltage VS. Supply
Voltage for the SP3223EU
Figure 12. Transmitter Output Voltage VS. Supply
Voltage for the SP3223EU
0 250 500 1000 1500
Load Capacitance (pF)
35
30
25
20
15
10
5
0
T1 at 1Mbps
T2 at 62.5Kbps
2.7 3 3.5 4 4.5 5
Supply V oltage (V)
6
4
2
0
-2
-4
-6
T1 at 1Mbps
T2 at 62.5Kbps
All Drivers loaded
with 3K//250pF
Figure 7. Transmitter Skew VS. Load Capacitance
for the SP3223EU
0 250 500 1000 1500 2000
200
150
100
50
0
Load Capacitance (pF)
T1 at 500Kbps
T2 at 31.2Kbps
All TX loaded 3K // CLoad
Figure 9. Transmitter Output Voltage VS. Load
Capacitance for the SP3223EU
Figure 11. Supply Current VS. Supply Voltage for
the SP3223EU
0 250 500 1000 1500
Load Capacitance (pF)
6
4
2
0
-2
-4
-6
T1 at 1Mbps
T2 at 62.5Kbps
2.7 3 3.5 4 4.5 5
Supply V oltage (V)
20
15
10
5
0
T1 at 1Mbps
T2 at 62.5Kbps
All Drivers loaded
with 3K//250pF
Figure 10. Supply Current VS. Load Capacitance for
the SP3223EU
TYPICAL PERFORMANCE CHARACTERISTICS
Supply Voltage (V) Supply Voltage (V)
Supply Voltage (V)
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PIN DESCRIPTION
Name Function Pin #
EN Receiver Enable, Apply logic LOW for normal operation. Apply logic HIGH to
disable receiver outputs (high-Z state). 1
C1+ Positive terminal of the voltage doubler charge-pump capacitor 2
V+ Regulated +5.5V output generated by charge pump 3
C1- Negative terminal of the voltage doubler charge-pump capacitor 4
C2+ Positive terminal of the inverting charge-pump capacitor 5
C2- Negative terminal of the inverting charge-pump capacitor 6
V- Regulated -5.5V output generated by charge pump 7
T2OUT RS-232 Driver output 8
R2IN RS-232 receiver input 9
R2OUT TTL/CMOS receiver output 10
STATUS TTL/CMOS output indicating online and shutdown status 11
T2IN TTL/CMOS driver input 12
T1IN TTL/CMOS driver input 13
ONLINE Apply logic HIGH to override AUTO ON-LINE ® circuitry keeping drivers active
(SHUTDOWN must also be logic HIGH, refer to table 2). 14
R1OUT TTL/CMOS receiver output 15
R1IN RS-232 receiver input 16
T1OUT RS-232 Driver output 17
GND Ground 18
Vcc +3.0V to +5.5V supply voltage 19
SHUTDOWN Apply logic LOW to shut down drivers and charge pump. This overrides all
AUTO ON-LINE ® circuitry and ONLINE (refer to table 2). 20
Table 2. Pin Description
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Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7017 • www.exar.com SP3223E/EB/EU_101_062712
DESCRIPTION
The SP3223 is a 2-driver/2-receiver device
ideal for portable or handheld applications.
The SP3223 transceivers meet the EIA/TIA-
232 and ITU-T V.28/V.24 communication
protocols and can be implemented in battery-
powered, portable, or handheld applications
such as notebook or handheld computers.
The SP3223 devices feature Exar's propri-
etary on-board charge pump circuitry that
generates ±5.5V RS-232 voltage levels from
a single +3.0V to +5.5V power supply.
These devices are an ideal choice for power
sensitive designs. Featuring AUTO ON-LINE®
circuitry, the SP3223 reduces the power sup-
ply drain to a 1µA supply current. In many
portable or handheld applications, an RS-232
cable can be disconnected or a connected
peripheral can be turned off. Under these
conditions, the internal charge pump and
the drivers will be shut down. Otherwise, the
system automatically comes online. This
feature allows design engineers to address
power saving concerns without major design
changes.
THEORY OF OPERATION
The SP3223 series is made up of four basic
circuit blocks:
1. Drivers, 2. Receivers, 3. The Exar pro-
prietary charge pump, and 4. AUTO ON-
LINE® circuitry.
Drivers
The drivers are inverting level transmitters
that convert TTL or CMOS logic levels to 5.0V
EIA/TIA-232 levels with an inverted sense
relative to the input logic levels. Typically, the
RS-232 output voltage swing is +5.4V with
no load and +5V minimum fully loaded. The
driver outputs are protected against innite
short-circuits to ground without degrada-
tion in reliability. These drivers comply with
the EIA-TIA-232F and all previous RS-232
versions. Unused driver inputs should be
connected to GND or VCC.
The drivers can guarantee output data
rates fully loaded with 3kΩ in parallel with
1000pF, (SP3223EU, CL= 250pF) ensuring
compatibility with PC-to-PC communication
software.
The slew rate of the driver output on the
E and EB versions is internally limited to a
maximum of 30V/µs in order to meet the EIA
standards (EIA RS-232D 2.1.7, Paragraph 5).
The Slew Rate of EU version is not limited
to enable higher speed data transfers. The
transition of the loaded output from HIGH to
LOW also meets the monotonicity require-
ments of the standard.
Figure 14 shows a loopback test circuit used
to test the RS-232 Drivers. Figure 15 shows
the test results where one driver was active
at 250kbps and all drivers are loaded with
an RS-232 receiver in parallel with a 1000pF
capacitor. RS-232 data transmission rate of
120kbps to 1Mbps provide compatibility with
designs in personal computer peripherals
and LAN applications.
Figure 13. Interface Circuitry Controlled by Micropro-
cessor Supervisory Circuit
SP3223E
2
4
6
5
3
7
19
5KΩ
5KΩ
GND
C1+
C1-
C2+
C2-
V+
V-
V
CC
11
12
15
10
0.1µF
+
C2
C5
C1
+
+C3
C4
+
+
17
8
16
9
RS-232
OUTPUTS
RS-232
INPUTS
14
20
11
V
CC
18
R
1
OUT R
1
IN
T
1
OUT
T
1
IN
T
2
IN
R
2
IN
R
2
OUT
ONLINE
SHUTDOWN
STATUS
UART
or
Serial µC
µP
Supervisor
IC
TTL/CMOS INPUTS
V
CC
V
IN
RESET
0.1µF
0.1µF 0.1µF
0.1µF
T
2
OUT
EN
TTL/CMOS OUTPUTS
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Receivers
The receivers convert ±5.0V EIA/TIA-232
levels to TTL or CMOS logic output levels.
Receivers have an inverting output that can
be disabled by using the EN pin.
Receivers are active when the AUTO ON-
LINE® circuitry is enabled or when in shut-
down. During the shutdown, the receivers will
continue to be active. If there is no activity
present at the receivers for a period longer
than 100µs or when SHUTDOWN is enabled,
the device goes into a standby mode where
the circuit draws 1µA. Driving EN to a logic
HIGH forces the outputs of the receivers into
high-impedance. The truth table logic of the
SP3223 driver and receiver outputs can be
found in Table 2.
Since receiver input is usually from a trans-
mission line where long cable lengths and
system interference can degrade the signal,
the inputs have a typical hysteresis margin
of 300mV. This ensures that the receiver
is virtually immune to noisy transmission
lines. Should an input be left unconnected,
an internal 5kΩ pull-down resistor to ground
will commit the output of the receiver to a
HIGH state.
Table 3. SHUTDOWN and EN Truth Tables
Note: In AUTO ON-LINE® Mode where ONLINE = GND
and SHUTDOWN = VCC, the device will shut down if
there is no activity present at the Receiver inputs.
Figure 14. Loopback Test Circuit for RS-232 Driver
Data Transmission Rates
Charge Pump
The charge pump uses a unique approach
compared to older less–efcient designs.
The charge pump still requires four external
capacitors, but uses a four–phase voltage
shifting technique to attain symmetrical
5.5V power supplies. The internal power
supply consists of a regulated dual charge
pump that provides output voltages of
+/-5.5V regardless of input voltage (VCC)
over the +3.0V to +5.5V range. This
is important to maintain compliant RS-
232 levels regardless of power supply
uctuations.
Figure 15. Loopback Test Circuit result at 250Kbps
(All Drivers Fully Loaded)
Device: SP3223
SHUTDOWN EN TXOUT RXOUT
0 0 High Z Active
0 1 High Z High Z
1 0 Active Active
1 1 Active High Z
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The charge pump operates in a discontinu-
ous mode using an internal oscillator. If the
output voltages are less than a magnitude
of 5.5V, the charge pump is enabled. If the
output voltages exceed a magnitude of 5.5V,
the charge pump is disabled. This oscillator
controls the four phases of the voltage shift-
ing. A description of each phase follows.
Phase 1
— VSS charge storage — During this phase
of the clock cycle, the positive side of capaci-
tors C1 and C2 are initially charged to VCC.
Cl
+ is then switched to GND and the charge
in C1
– is transferred to C2
–. Since C2
+ is con-
nected to VCC, the voltage potential across
capacitor C2 is now 2 times VCC.
Phase 2
— VSS transfer — Phase two of the clock
connects the negative terminal of C2 to the VSS
storage capacitor and the positive terminal of
C2 to GND. This transfers a negative gener-
ated voltage to C3. This generated voltage is
regulated to a minimum voltage of -5.5V.
Simultaneous with the transfer of the volt-
age to C3, the positive side of capacitor C1
is switched to VCC and the negative side is
connected to GND.
Phase 3
— VDD charge storage — The third phase of
the clock is identical to the rst phase — the
charge transferred in C1 produces –VCC in
the negative terminal of C1, which is applied
to the negative side of capacitor C2. Since
C2
+ is at VCC, the voltage potential across C2
is 2 times VCC.
Phase 4
— VDD transfer — The fourth phase of
the clock connects the negative terminal
of C2 to GND, and transfers this positive
generated voltage across C2 to C4, the
VDD storage capacitor. This voltage is
regulated to +5.5V. At this voltage, the in-
ternal oscillator is disabled. Simultaneous
with the transfer of the voltage to C4, the
positive side of capacitor C1 is switched to VCC
and the negative side is switched to GND, al-
lowing the charge pump cycle to begin again.
The charge pump cycle will continue as long
as the operational conditions for the internal
oscillator are present.
Since both V+ and V– are separately gener-
ated from VCC, in a no–load condition V+
and V– will be symmetrical. Older charge
pump approaches that generate V– from
V+ will show a decrease in the magnitude
of V– compared to V+ due to the inherent
inefciencies in the design.
The Exar charge pump is designed to
operate reliably with a range of low cost
capacitors. Either polarized or non polar-
ized capacitors may be used. If polarized
capacitors are used they should be oriented
as shown in the Typical Operating Circuit.
The V+ capacitor may be connected to either
ground or Vcc (polarity reversed.)
The charge pump operates with 0.1µF
capacitors for 3.3V operation. For other
supply voltages, see table 4 for required
capacitor values. Do not use values smaller
than those listed. Increasing the capacitor
values (e.g., by doubling in value) reduces
ripple on the transmitter outputs and may
slightly reduce power consumption. C2, C3,
and C4 can be increased without changing
C1’s value.
For best charge pump efciency locate the
charge pump and bypass capacitors as
close as possible to the IC. Surface mount
capacitors are best for this purpose. Using
capacitors with lower equivalent series re-
sistance (ESR) and self-inductance, along
with minimizing parasitic PCB trace induc-
tance will optimize charge pump operation.
Designers are also advised to consider that
capacitor values may shift over time and
operating temperature.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7017 • www.exar.com SP3223E/EB/EU_101_062712
12
Figure 16. Charge Pump - Phase 1
Figure 17. Charge Pump - Phase 2
V
CC
= +5V
–5V –5V
+5V
V
SS
Storage Capacitor
V
DD
Storage Capacitor
C
1
C
2
C
3
C
4
+
+
+ +
–
–
––
V
CC
= +5V
–10V
V
SS
Storage Capacitor
V
DD
Storage Capacitor
C
1
C
2
C
3
C
4
+
+
+ +
–
–
––
Ch1 2.00V Ch2 2.00V M 1.00ms Ch1 1.96V
2
1T
T[ ]
T
2
+6V
a) C
2+
b) C
2
-
-6V
0V
0V
Figure 18. Charge Pump Waveforms
Figure 19. Charge Pump - Phase 3
V
CC
= +5V
–5V
+5V
–5V
V
SS
Storage Capacitor
V
DD
Storage Capacitor
C
1
C
2
C
3
C
4
+
+
+ +
–
–
––
Figure 20. Charge Pump - Phase 4
V
CC
= +5V
+10V
V
SS
Storage Capacitor
V
DD
Storage Capacitor
C
1
C
2
C
3
C
4
+
+
+ +
–
–
––
Minimum recommended charge pump capacitor value
Input Voltage VCC Charge pump capacitor value
3.0V to 3.6V C1 - C4 = 0.1µF
4.5V to 5.5V C1 = 0.047µF, C2-C4 = 0.33µF
3.0V to 5.5V C1 - C4 = 0.22µF
Table 4. Minimum Charge Pump Capacitor values
13
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7017 • www.exar.com SP3223E/EB/EU_101_062712
AUTO ON-LINE® Circuitry
The SP3223 device has AUTO ON-LINE®
circuitry on board that saves power in ap-
plications such as laptop computers, PDA's,
and other portable systems.
The SP3223 device incorporates an AUTO
ON-LINE® circuit that automatically enables
itself when the external transmitter is enabled
and the cable is connected. Conversely,
the AUTO ON-LINE® circuit also disables
most of the internal circuitry when the device
is not being used and goes into a standby
mode where the device typically draws 1µA.
This function is externally controlled by the
ONLINE pin. When this pin is tied to a logic
LOW, the AUTO ON-LINE® function is ac-
tive. Once active, the device is enabled until
there is no activity on receiver inputs. The
receiver input typically sees at least ±3V,
which are generated from the transmitter
at the other end of the cable with a ±5V
minimum. When the external transmitter is
disabled or the cable is disconnected, the
receiver input will be pulled down by its
internal 5kΩ resistor to ground. When this
occurs over a period of time, the internal
transmitters will be disabled and the device
goes into a shutdown or standby mode.
When the ONLINE pin is HIGH, the AUTO
ON-LINE® mode is disabled.
The AUTO ON-LINE® circuit has two
stages:
1) Inactive Detection
2) Accumulated Delay
The rst stage, shown in Figure 22, detects
an inactive input. A logic HIGH is asserted
on RXINACT if the cable is disconnected
or the external transmitters are disabled.
Otherwise, RXINACT will be at a logic LOW.
This circuit is duplicated for each of the other
receivers.
The second stage of the AUTO ON-LINE®
circuitry, shown in Figure 23, processes
the receiver's RXINACT signal with an ac-
cumulated delay that disables the device to
a 1µA typical supply current. The STATUS
pin goes to a logic LOW when the cable
is disconnected, the external transmit-
ter is disabled, or the SHUTDOWN pin is
invoked. The typical accumulated delay
is around 20µs. When the SP3223 drivers
and internal charge pump are disabled, the
supply current is reduced to 1µA typical.
This can commonly occur in handheld or
portable applications where the RS-232
cable is disconnected or the RS-232 drivers
of the connected peripheral are truned off.
The AUTO ON-LINE® mode can be disabled
by the SHUTDOWN pin. If this pin is a logic
LOW, the AUTO ON-LINE® function will not
operate regardless of the logic state of the
ONLINE pin. Table 5 summarizes the logic
of the AUTO ON-LINE® operating modes.
The truth table logic of the SP3223 driver and
receiver outputs can be found in Table 3.
The STATUS pin outputs a logic LOW signal
if the device is shutdown. This pin goes to
a logic HIGH when the external transmitter
is enabled and the cable is connected.
When the SP3223 device is shutdown, the
charge pumps are turned off. V+ charge
pump output decays to VCC,the V- output
decays to GND. The decay time will depend
on the size of capacitors used for the charge
pump. Once in shutdown, the time required
to exit the shut down state and have valid
V+ and V- levels is typically 200µs.
For easy programming, the STATUS can
be used to indicate DTR or a Ring Indicator
signal. Tying ONLINE and SHUTDOWN
together will bypass the AUTO ON-LINE®
circuitry so this connection acts like a shut-
down input pin
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Figure 21. AUTO ON-LINE® Timing Waveforms
RECEIVER
RS-232 INPUT
VOLTAGES
STATUS
+5V
0V
-5V
tSTSL
tSTSH
tONLINE
V
CC
0V
DRIVER
RS-232 OUTPUT
VOLTAGES
0V
+2.7V
-2.7V
S
H
U
T
D
O
W
N
Table 5. AUTO ON-LINE® Logic
Figure 22. Stage I of AUTO ON-LINE® Circuitry
Figure 23. Stage II of AUTO ON-LINE® Circuitry
RS-232
Receiver Block
RXINACT
Inactive Detection Block
RXIN RXOUT
R
1
ON R
2
ON
Delay
Buffer Delay
Buffer
SHUTDOWN
INACTIVE
RS-232 SIGNAL
AT RECEIVER
INPUT
SHUTDOWN ONLINE STATUS TRANSCEIVER
STATUS
YES HIGH LOW HIGH Normal Operation
(AUTO ON-LINE©)
NO HIGH HIGH LOW Normal Operation
NO HIGH LOW LOW Shutdown
(AUTO ON-LINE©)
YES LOW HIGH/LOW HIGH Shutdown
NO LOW HIGH/LOW LOW Shutdown
15
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7017 • www.exar.com SP3223E/EB/EU_101_062712
ESD TOLERANCE
The SP3223 series incorporates
ruggedized ESD cells on all driver output
and receiver input pins. The ESD structure is
improved over our previous family for more
rugged applications and environments
sensitive to electro-static discharges and
associated transients. The improved ESD
tolerance is at least +15kV without damage
nor latch-up.
There are different methods of ESD testing
applied:
a) MIL-STD-883, Method 3015.7
b) IEC61000-4-2 Air-Discharge
c) IEC61000-4-2 Direct Contact
The Human Body Model has been the
generally accepted ESD testing method
for semiconductors. This method is also
specied in MIL-STD-883, Method 3015.7
for ESD testing. The premise of this ESD test
is to simulate the human body’s potential to
store electro-static energy and discharge it
to an integrated circuit. The simulation is
performed by using a test model as shown
in Figure 24. This method will test the IC’s
capability to withstand an ESD transient
during normal handling such as in manu-
facturing areas where the IC's tend to be
handled frequently.
The IEC-61000-4-2, formerly IEC801-2, is
generally used for testing ESD on equipment
and systems. For system manufacturers,
they must guarantee a certain amount of
ESD protection since the system itself is ex-
posed to the outside environment and human
presence. The premise with IEC61000-4-2
is that the system is required to withstand
an amount of static electricity when ESD
is applied to points and surfaces of the
equipment that are accessible to personnel
during normal usage. The transceiver IC
receives most of the ESD current when the
ESD source is applied to the connector pins.
The test circuit for IEC61000-4-2 is shown
on Figure 25. There are two methods within
IEC61000-4-2, the Air Discharge method and
the Contact Discharge method. With the Air
Discharge Method, an ESD voltage is applied
to the equipment under test (EUT) through
air. This simulates an electrically charged
person ready to connect a cable onto the
rear of the system only to nd an unpleas-
ant zap just before the person touches the
back panel. The high energy potential on the
person discharges through an arcing path
to the rear panel of the system before he or
she even touches the system. This energy,
whether discharged directly or through air,
is predominantly a function of the discharge
current rather than the discharge voltage.
Variables with an air discharge such as
approach speed of the object carrying the
ESD potential to the system and humidity
will tend to change the discharge current.
For example, the rise time of the discharge
current varies with the approach speed.
The Contact Discharge Method applies the
ESD current directly to the EUT. This method
was devised to reduce the unpredictability
of the ESD arc. The discharge current rise
time is constant since the energy is directly
transferred without the air-gap arc. In situ-
ations such as hand held systems, the ESD
charge can be directly discharged to the
equipment from a person already holding
the equipment. The current is transferred
on to the keypad or the serial port of the
equipment directly and then travels through
the PCB and nally to the IC.
Figure 24. ESD Test Circuit for Human Body Model
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DEVICE PIN HUMAN BODY IEC61000-4-2
TESTED MODEL Air Discharge Direct Contact Level
Driver Outputs ±15kV ±15kV ±8kV 4
Receiver Inputs ±15kV ±15kV ±8kV 4
The circuit model in Figures 24 and 25 rep-
resent the typical ESD testing circuit used for
all three methods. The CS is initially charged
with the DC power supply when the rst
switch (SW1) is on. Now that the capacitor
is charged, the second switch (SW2) is on
while SW1 switches off. The voltage stored
in the capacitor is then applied through RS,
the current limiting resistor, onto the device
under test (DUT). In ESD tests, the SW2
switch is pulsed so that the device under
test receives a duration of voltage.
For the Human Body Model, the current
limiting resistor (RS) and the source capacitor
(CS) are 1.5kΩ an 100pF, respectively. For
IEC-61000-4-2, the current limiting resistor
(RS) and the source capacitor (CS) are 330Ω
an 150pF, respectively.
The higher CS value and lower RS value in
the IEC61000-4-2 model are more stringent
than the Human Body Model. The larger
storage capacitor injects a higher voltage
to the test point when SW2 is switched on.
The lower current limiting resistor increases
the current charge onto the test point.
Figure 26. ESD Test Waveform for IEC61000-4-2
t=0ns t=30ns
0A
15A
30A
t →
i→
Figure 25. ESD Test Circuit for IEC61000-4-2
Table 6. Transceiver ESD Tolerance Levels
17
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7017 • www.exar.com SP3223E/EB/EU_101_062712
PACKAGE: 20 Pin TSSOP
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7017 • www.exar.com SP3223E/EB/EU_101_062712
18
PACKAGE: 20 Pin SSOP
19
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7017 • www.exar.com SP3223E/EB/EU_101_062712
Part Number Temperature Range Package Types
SP3223EBCA-L ...................................................0°C to +70°C -------------------------------------------- 20-pin SSOP
SP3223EBCA-L/TR .............................................0°C to +70°C -------------------------------------------- 20-pin SSOP
SP3223EBCY-L ...................................................0°C to +70°C -------------------------------------------20-pin TSSOP
SP3223EBCY-L/TR .............................................0°C to +70°C -------------------------------------------20-pin TSSOP
SP3223EBEA-L ................................................. -40°C to +85°C ------------------------------------------- 20-pin SSOP
SP3223EBEA-L/TR ........................................... -40°C to +85°C ------------------------------------------- 20-pin SSOP
SP3223EBEY-L ................................................. -40°C to +85°C ------------------------------------------20-pin TSSOP
SP3223EBEY-L/TR ........................................... -40°C to +85°C ------------------------------------------20-pin TSSOP
SP3223ECA-L .....................................................0°C to +70°C ..................................................... 20-pin SSOP
SP3223ECA-L/TR ...............................................0°C to +70°C ..................................................... 20-pin SSOP
SP3223ECY-L .....................................................0°C to +70°C ................................................... 20-pin TSSOP
SP3223ECY-L/TR ...............................................0°C to +70°C ................................................... 20-pin TSSOP
SP3223EEA-L ................................................... -40°C to +85°C .................................................... 20-pin SSOP
SP3223EEA-L/TR ............................................. -40°C to +85°C .................................................... 20-pin SSOP
SP3223EEY-L ....................................................-40°C to +85°C .................................................. 20-pin TSSOP
SP3223EEY-L/TR .............................................. -40°C to +85°C .................................................. 20-pin TSSOP
SP3223EUCA-L ..................................................0°C to +70°C ..................................................... 20-pin SSOP
SP3223EUCA-L/TR ............................................0°C to +70°C ..................................................... 20-pin SSOP
SP3223EUCY-L ...................................................0°C to +70°C ................................................... 20-pin TSSOP
SP3223EUCY-L/TR .............................................0°C to +70°C ................................................... 20-pin TSSOP
SP3223EUEA-L ................................................. -40°C to +85°C .................................................... 20-pin SSOP
SP3223EUEA-L/TR ........................................... -40°C to +85°C .................................................... 20-pin SSOP
SP3223EUEY-L ................................................. -40°C to +85°C .................................................. 20-pin TSSOP
SP3223EUEY-L/TR ........................................... -40°C to +85°C .................................................. 20-pin TSSOP
Note: "-L" indicates lead free packaging, "/TR" is for tape and reel option
ORDERING INFORMATION
SP3223 E U EY L /TR
Tape and Reel options
“L” suffix indicates Lead Free packaging
Package Type A= SSOP
Y=TSSOP
Temperature Range C= Commercial Range 0ºc to 70ºC
E= Extended Range -40ºc to 85ºC
Speed Indicator Blank= 120Kbps
B= 250Kbps
U= 1Mbps
ESD Rating E= 15kV HBM and IEC 1000-4
Part Number
PRODUCT NOMENCLATURE
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7017 • www.exar.com SP3223E/EB/EU_101_062712
20
DATE REVISION DESCRIPTION
10-06-06 --- Legacy Sipex data sheet
Nov 2010 1.0.0 Convert to Exar data sheet format and remove EOL parts.
June 2012 1.0.1 Correct type error on page 1 pin diagram. Pin 9 should be R2IN not R1IN,
Change ESD protection levels to IEC61000-4-2.
REVISION HISTORY
Notice
EXAR Corporation reserves the right to make changes to any products contained in this publication in order to improve design, performance or
reliability. EXAR Corporation assumes no representation that the circuits are free of patent infringement. Charts and schedules contained herein are
only for illustration purposes and may vary depending upon a user's specic application. While the information in this publication has been carefully
checked;
no responsibility, however, is assumed for inaccuracies.
EXAR Corporation does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can
reasonably be expected to cause failure of the life support system or to signicantly affect its safety or effectiveness. Products are not authorized for
use in such applications unless EXAR Corporation receives, in writing, assurances to its satisfaction that: (a) the risk of injury or damage has been
minimized ; (b) the user assumes all such risks; (c) potential liability of EXAR Corporation is adequately protected under the circumstances.
Copyright 2012 EXAR Corporation
Datasheet June 2012
For technical support please email Exar's Serial Technical Support group at: serialtechsupport@exar.com
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