1
LTC1350
1350fa
3.3V Low Power
EIA/TIA-562 3-Driver/
5-Receiver Transceiver
■
Low Supply Current: 300µA
■
Receivers 4 and 5 Kept Alive
in Shutdown: 35µA
■
ESD Protection: ±10kV
■
Operates from a Single 3.3V Supply
■
Uses Small Capacitors: 0.1µF
■
Operates to 120kBaud
■
Three-State Outputs are High Impedance
When Off
■
Output Overvoltage Does Not Force Current
Back into Supplies
■
EIA/TIA-562 I/O Lines Can Be Forced to ±25V
Without Damage
■
Flowthrough Architecture
The LTC
®
1350 is a 3-driver/5-receiver EIA/TIA-562
transceiver with very low supply current. In the no load
condition, the supply current is only 300µA. The charge
pump only requires four 0.1µF capacitors.
In Shutdown mode, two receivers are kept alive and the
supply current is only 35µA. All RS232 outputs assume
a high impedance state in Shutdown or with the power
off.
T
he LTC1350 is fully compliant with all data rate and
overvoltage EIA/TIA-562 specifications. The transceiver
can operate up to 120kbaud with a 1000pF and 3kΩ load.
Both driver outputs and receiver inputs can be forced to
±25V without damage and can survive multiple ±10kV
ESD strikes.
■
Notebook Computers
■
Palmtop Computers
3-Drivers/5-Receivers with Shutdown
Quiescent and Shutdown Supply Current
vs Temperature
1
2
3
4
5
6
7
8
9
10
11
12
13
14
V+
VCC
C1+
C1–
DR1 OUT
RX1 IN
DR2 OUT
RX2 IN
RX3 IN
RX4 IN
DR3 OUT
RX5 IN
ON/OFF
NC
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V–
C2+
C2–
DR1 IN
RX1 OUT
DR2 IN
RX2 OUT
RX3 OUT
RX4 OUT
DR3 IN
RX5 OUT
GND
NC
NC
LTC1350
LTC1350 • TA01
TEMPERATURE (˚C)
–40
QUIESCENT CURRENT (µA)
400
500
600
20 60
LTC1350 • TA02
300
200
–20 0 40 80 100
100
0
TEST CONDITION: VCC = 3.3V
ALL DRIVER INPUTS TIED TO VCC
SHUTDOWN CURRENT (µA)
65
75
85
55
45
35
0
QUIESCENT
CURRENT
SHUTDOWN CURRENT
FEATURES
APPLICATIO S
U
DESCRIPTIO
U
TYPICAL APPLICATIO
U
, LTC and LT are registered trademarks of Linear Technology Corporation.
2
LTC1350
1350fa
Supply Voltage (V
CC
)................................................ 5V
Input Voltage
Driver ....................................... –0.3V to V
CC
+ 0.3V
Receiver ............................................... – 25V to 25V
ON/OFF Pin ................................ –0.3V to V
CC
+ 0.3V
Output Voltage
Driver .................................................... – 25V to 25V
Receiver .................................... – 0.3V to V
CC
+ 0.3V
Short-Circuit Duration
V
+
................................................................... 30 sec
V
–
................................................................... 30 sec
Driver Output .............................................. Indefinite
Receiver Output .......................................... Indefinite
Operating Temperature Range
Commercial (LTC1350C) ........................ 0°C to 70°C
Industrial (LTC1350I) ........................ –40°C to 85°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
The ● denotes specifications which apply over the full operating
temperature range. VCC = 3.3V, C1 = C2 = C3 = C4 = 0.1µF, unless noted.
ABSOLUTE AXI U RATI GS
WWWU
PACKAGE/ORDER I FOR ATIO
UU
W
DC ELECTRICAL CHARACTERISTICS
ORDER PART
NUMBER
LTC1350CG
LTC1350CNW
LTC1350CSW
LTC1350IG
LTC1350INW
LTC1350ISW
T
JMAX
= 125°C, θ
JA
= 96°C/W (G)
T
JMAX
= 125°C, θ
JA
= 56°C/W (NW)
T
JMAX
= 125°C, θ
JA
= 85°C/W (SW)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
V+
VCC
C1+
C1–
DR1 OUT
RX1 IN
DR2 OUT
RX2 IN
RX3 IN
RX4 IN
DR3 OUT
RX5 IN
ON/OFF
NC
V–
C2+
C2–
DR1 IN
RX1 OUT
DR2 IN
RX2 OUT
RX3 OUT
RX4 OUT
DR3 IN
RX5 OUT
GND
NC
NC
NW PACKAGE
28-LEAD PDIP
TOP VIEW
SW PACKAGE
28-LEAD PLASTIC SO WIDE
G PACKAGE
28-LEAD SSOP
Consult LTC Marketing for parts specified with wider operating temperature
ranges.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Any Driver
Output Voltage Swing 3k to GND Positive ● 3.7 4.5 V
Negative ●–3.7 – 4.5 V
Logic Input Voltage Level Input Low Level (V
OUT
= High) ●1.4 0.8 V
Input High Level (V
OUT
= Low) ●2.0 1.4 V
Logic Input Current V
IN
= V
CC
● 5 µA
V
IN
= 0V ●–5 µA
Output Short-Circuit Current V
OUT
= 0V ±9±10 mA
Output Leakage Current Shutdown (Note 3), V
OUT
= ±20V 10 500 µA
Any Receiver
Input Voltage Thresholds Input Low Threshold ●0.8 1.3 V
Input High Threshold ●1.7 2.4 V
Hysteresis ●0.1 0.4 1 V
Input Resistance V
IN
= ±10V 3 5 7 kΩ
Output Voltage Output Low, I
OUT
= – 1.6mA (V
CC
= 3.3V) ●0.2 0.4 V
Output High, I
OUT
= 160µA (V
CC
= 3.3V) ●3.0 3.2 V
Output Short-Circuit Current Sinking Current, V
OUT
= V
CC
–3 –20 mA
Output Leakage Current Shutdown (Note 3), 0V ≤ V
OUT
≤ V
CC
●110 µA
3
LTC1350
1350fa
The ● denotes specifications which apply over the full operating
temperature range. VCC = 3.3V, C1 = C2 = C3 = C4 = 0.1µF, unless noted.
The ● denotes specifications which apply over the full operating temperature range.
VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF, unless noted.
Note 3: Supply current measurement in Shutdown mode is performed
with V
ON/OFF
= 0V.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Slew Rate R
L
= 3k, C
L
= 51pF 8 30 V/µs
R
L
= 3k, C
L
= 1000pF 3 5 V/µs
Driver Propagation Delay t
HLD
(Figure 1) ●23.5 µs
(TTL to EIA/TIA-562) t
LHD
(Figure 1) ●23.5 µs
Receiver Propagation Delay t
HLR
(Figure 2) ●0.3 0.8 µs
(EIA/TIA-562 to TTL) t
LHR
(Figure 2) ●0.3 0.8 µs
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2: Supply current is measured with driver and receiver outputs
unloaded.
DC ELECTRICAL CHARACTERISTICS
AC CHARACTERISTICS
PARAMETER CONDITIONS MIN TYP MAX UNITS
Power Supply Generator
V
+
Output Voltage I
OUT
= 0mA 5.7 V
I
OUT
= 5mA 5.5 V
V
–
Output Voltage I
OUT
= 0mA –5.3 V
I
OUT
= –5mA –5.0 V
Supply Rise Time Shutdown to Turn-On 0.2 ms
Power Supply
V
CC
Supply Current No Load (All Drivers V
IN
= V
CC
)(Note 2) 0°C ≤ T
A
≤ 70°C●0.3 0.6 mA
No Load (All Drivers V
IN
= 0)(Note 2) 0°C ≤ T
A
≤ 70°C●0.5 1.0 mA
No Load (All Drivers V
IN
= V
CC
)(Note 2) 0°C ≤ T
A
≤ 85°C●0.3 1.0 mA
No Load (All Drivers V
IN
= V
CC
)(Note 2) –40°C ≤ T
A
≤ 0°C●0.3 1.5 mA
No Load (All Drivers V
IN
= 0)(Note 2) –40°C ≤ T
A
≤ 85°C●0.5 1.5 mA
Shutdown (Note 3) ●35 50 µA
ON/OFF Threshold Low ●1.4 0.8 V
ON/OFF Threshold High ●2.0 1.4 V
4
LTC1350
1350fa
TYPICAL PERFOR A CE CHARACTERISTICS
UW
TEMPERATURE (˚C)
–40
SHORT-CIRCUIT CURRENT (mA)
35
20
I
SC–
I
SC+
LTC1350 • TPC07
20
10
–20 0 40
5
0
40
30
25
15
60 80 100
Driver Output Voltage
vs Temperature
Receiver Input Thresholds
vs Temperature
Driver Short-Circuit Current
vs Temperature
Driver Leakage in Shutdown
vs Temperature
VCC Supply Current
vs Temperature
Supply Current vs Data Rate
TEMPERATURE (°C)
–40
–5
DRIVER OUTPUT VOLTAGE (V)
–4
–2
–1
0
5
2
040 60
LTC1350 • TPC01
–3
3
4
1
–20 20 80 100
V
CC
= 3.3V
OUTPUT HIGH
V
CC
= 3.3V
OUTPUT LOW
ALL DRIVERS WITH LOAD, R
L
= 3k
TEMPERATURE (˚C)
–40
THRESHOLD VOLTAGE (V)
1.8
2.0
V
TH+
V
TH–
2.2
20 60
LT1350 • TPC02
1.6
1.4
–20 0 40 80 100
1.2
1.0
DATA RATE (k Baud)
0
SUPPLY CURRENT (mA)
20
25
30
60 100
LTC1350 • TPC03
15
10
20 40 80 120 140
5
0
V
CC
= 3.3V
R
L
= 3k
C
L
= 2500pF
3 DRIVERS ACTIVE
TEMPERATURE (°C)
–40
0
SUPPLY CURRENT (mA)
0.5
1.5
2.0
2.5
5.0
3.5
040 60
LTC1350 • TPC04
1.0
4.0
4.5
3.0
–20 20 80 100
RL = 3k
3 DRIVERS LOADED
RL = 3k
1 DRIVER LOADED
TEMPERATURE (°C)
0
LEAKAGE CURRENT (µA)
60
45
40
35
30
25
20
15
10
5
0
LTC1350 • TPC05
20 7010 30 40 50
V
OUT
= –20V
V
OUT
= 20V
TEMPERATURE (˚C)
–40
SHORT-CIRCUIT CURRENT (mA)
14
20
I
SC–
I
SC+
LTC1350 • TPC06
8
4
–20 0 40
2
0
16
12
10
6
60 80 100
Receiver Short-Circuit Current
vs Temperature
DRIVER
OUTPUT
R
L
= 3k
C
L
= 1000pF
DRIVER
OUTPUT
R
L
= 3k
INPUT
LTC1350 • TPC08
RECEIVER
OUTPUT
C
L
= 50pF
INPUT
LTC1350 • TPC09
Driver Output Waveforms Receiver Output Waveform
5
LTC1350
1350fa
UU
U
PI FU CTIO S
SWITCHI G TI E WAVEFOR S
UWW
1.4V
0V
VCC
0V
V+
V–
0V
DR
INPUT
DR
OUTPUT
1.4V
tHLD
tLHD
LTC1350 • F01
0.8V
VCC
0V
2.4V
RX
INPUT
RX
OUTPUT
1.3V
tHLR
1.7V
tLHR
LTC1350 • F02
VCC
0V
Figure 2. Receiver Propagation Delay Timing
Figure 1. Driver Propagation Delay Timing
C1
+
, C1
–
, C2
+
, C2
–
: Commutating Capacitor Inputs. These
pins require two external capacitors (C = 0.1µF): one from
C1
+
to C1
–
and another from C2
+
to C2
–
. To maintain
charge pump efficiency, the capacitor’s effective series
resistance should be less than 20Ω.
DR IN: EIA/TIA-562 Driver Input Pins. Inputs are TTL/
CMOS compatible. Inputs should not be allowed to float.
Tie unused inputs to V
CC
.
DR OUT: Driver Outputs at EIA/TIA-562 Voltage Levels.
Outputs are in a high impedance state when in the Shutdown
mode or V
CC
= 0V. The driver outputs are protected against
ESD to ±10kV for human body model discharges.
RX IN: Receiver Inputs. These pins can be forced to ±25V
without damage. The receiver inputs are protected against
ESD to ±10kV for human body model discharges. Each
receiver provides 0.4V of hysteresis for noise immunity.
RX OUT: Receiver Outputs with TTL/CMOS Voltage Levels.
Receiver 1, 2 and 3 outputs are in a high impedance state
when in Shutdown mode to allow data line sharing.
Receivers 4 and 5 are kept alive in Shutdown.
V
CC
: 3.3V Input Supply Pin. Supply current is typically
35µA in the Shutdown mode. This pin should be decoupled
with a 0.1µF ceramic capacitor.
GND: Ground Pin.
ON/OFF: TTL/CMOS Compatible Shutdown Pin. A logic
low puts the device in the Shutdown mode with receivers
4 and 5 kept alive and the supply current equal to 35µA. All
driver and other receiver outputs are in high impedance
state. This pin cannot float.
V
+
: Positive Supply Output. V
+
≅ 2V
CC
– 1V. This pin
requires an external capacitor (C = 0.1µF) for charge
storage. The capacitor may be tied to ground or V
CC
. With
multiple devices, the V
+
and V
–
pins may be paralleled into
common capacitors. For a large number of devices,
increasing the size of the shared common storage
capacitors is recommended to reduce ripple.
V
–
:
Negative Supply Output. V – ≅ – (2VCC – 1.3V). This
pin requires an external capacitor (C = 0.1µF) for charge
storage.
6
LTC1350
1350fa
TEST CIRCUITS
ESD Test Circuit
Receiver Timing Test LoadDriver Timing Test Load
DRIVER
DRIVER
INPUT
3k
51pF
DRIVER
OUTPUT
LTC1350 • TA03
RX
RX INPUT
51pF
RX
OUTPUT
LTC1350 • TA04
LTC1350 • TC0
1
VCC
C1
0.1µF
LTC1350
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
C3
0.1µF
V–
V+
C2
0.1µF
C4
0.1µF
RS232
LINE PINS
PROTECTED
TO ±10kV
DR1 IN
RX1 OUT
DR2 IN
RX2 OUT
RX3 OUT
RX4 OUT
DR3 IN
RX5 OUT
GND
NC
NC
DR1 OUT
RX1 IN
DR2 OUT
RX2 IN
RX3 IN
RX4 IN
DR3 OUT
RX5 IN
ON/OFF
NC
7
LTC1350
1350fa
U
PACKAGE DESCRIPTIO
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
G Package
28-Lead Plastic SSOP (5.3mm)
(Reference LTC DWG # 05-08-1640)
G28 SSOP 0802
0.09 – 0.25
(.0035 – .010)
0° – 8°
0.55 – 0.95
(.022 – .037)
5.00 – 5.60**
(.197 – .221)
7.40 – 8.20
(.291 – .323)
1234567891011 12 1413
9.90 – 10.50*
(.390 – .413)
2526 22 21 20 19 18 17 16 1523242728
2.0
(.079)
0.05
(.002)
0.65
(.0256)
BSC 0.22 – 0.38
(.009 – .015)
MILLIMETERS
(INCHES)
DIMENSIONS DO NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED .152mm (.006") PER SIDE
DIMENSIONS DO NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED .254mm (.010") PER SIDE
*
**
NOTE:
1. CONTROLLING DIMENSION: MILLIMETERS
2. DIMENSIONS ARE IN
3. DRAWING NOT TO SCALE
0.42 ±0.03 0.65 BSC
5.3 – 5.7
7.8 – 8.2
RECOMMENDED SOLDER PAD LAYOUT
1.25 ±0.12
NW28 1002
.505 – .560*
(12.827 – 14.224)
1.467*
(36.957)
MAX
12345678910
27 19
20212224 23
252628
11 12 13 14
15
16
1718
.008 – .015
(0.203 – 0.381)
.625 +.035
–.015
+0.889
–0.381
15.87
()
.600 – .625
(15.240 – 15.875)
.070
(1.778)
TYP
.015
(0.381)
MIN
.120
(3.175)
MIN
.150 ± .005
(3.810 ± 0.127)
.018 ± .003
(0.457 ± 0.076)
.035 – .080
(0.889 – 2.032)
.045 – .065
(1.143 – 1.651)
NOTE:
1. DIMENSIONS ARE INCHES
MILLIMETERS
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
.100
(2.54)
BSC
NW Package
28-Lead PDIP (Wide .600 Inch)
(Reference LTC DWG # 05-08-1520)
8
LTC1350
1350fa
LINEAR TECHNOLOGY CORPORATION 1993
LW/TP 0103 1K REV A • PRINTED IN USA
PART NUMBER DESCRIPTION COMMENTS
LT®1137A 5V, 3 Driver, 5 Receiver RS232 Transceiver ±15kV ESD per IEC 1000-4
LTC1327 3.3V, 3 Driver, 5 Receiver RS562 Transceiver 300µA Supply Current, 0.2µA in Shutdown
LTC1337 5V, 3 Driver, 5 Receiver RS232 Transceiver 300µA Supply Current, 1µA in Shutdown
LTC1348 3.3V to 5V, 3 Driver, 5 Receiver RS232 Transceiver True RS232 on 3.3V, 5 Receivers Active in Shutdown
LTC1385 3.3V, 2 Driver, 2 Receiver RS562 Transceiver 200µA Supply Current, 2 Receivers Active in Shutdown
LTC1386 3.3V, 2 Driver, 2 Receiver RS562 Transceiver 200µA Supply Current, Narrow 16-Pin SO
LTC2844 3.3V, Software-Selectable Multiprotocol Transceiver 4 Drivers, 4 Receivers for Control Signals Including LL
LTC2845 3.3V, Software-Selectable Multiprotocol Transceiver 5 Drivers, 5 Receivers for Control Signals Including LL, RL and TM
LTC2846 3.3V, Software-Selectable Multiprotocol Transceiver 4 Drivers, 4 Receivers with Termination for Data/Clock
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7487
(408) 432-1900
●
FAX
: (408) 434-0507
●
WWW
.linear.com
U
PACKAGE DESCRIPTIO
S28 (WIDE) 0502
0° – 8° TYP
NOTE 3
.009 – .013
(0.229 – 0.330)
.016 – .050
(0.406 – 1.270)
.291 – .299
(7.391 – 7.595)
NOTE 4
× 45°
.010 – .029
(0.254 – 0.737)
.037 – .045
(0.940 – 1.143)
.004 – .012
(0.102 – 0.305)
.093 – .104
(2.362 – 2.642)
.050
(1.270)
BSC .014 – .019
(0.356 – 0.482)
TYP
NOTE 3
.697 – .712
(17.70 – 18.08)
NOTE 4
12345678
.394 – .419
(10.007 – 10.643)
910
2526
11 12
22 21 20 19 18 17 16 152324
14
N/2
13
2728
N
.420
MIN
.325 ±.005
RECOMMENDED SOLDER PAD LAYOUT
.045 ±.005
N
123 N/2
.050 BSC
.030 ±.005
TYP
.005
(0.127)
RAD MIN
INCHES
(MILLIMETERS)
NOTE:
1. DIMENSIONS IN
2. DRAWING NOT TO SCALE
3. PIN 1 IDENT, NOTCH ON TOP AND CAVITIES ON THE BOTTOM OF PACKAGES ARE THE MANUFACTURING OPTIONS.
THE PART MAY BE SUPPLIED WITH OR WITHOUT ANY OF THE OPTIONS
4. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
RELATED PARTS
SW Package
28-Lead Plastic Small Outline (Wide .300 Inch)
(Reference LTC DWG # 05-08-1620)
