DS3695,DS3695T,DS3696,DS3697
DS3695/DS3695T/DS3696/DS3697 Multipoint RS485/RS422 Transceivers/Repeaters
Literature Number: SNLS072B
DS3695/DS3695T/DS3696/DS3697
Multipoint RS485/RS422 Transceivers/Repeaters
General Description
The DS3695, DS3696, and DS3697 are high speed differ-
ential TRI-STATE®bus/line transceivers/repeaters designed
to meet the requirements of EIA standard RS485 with ex-
tended common mode range (+12V to −7V), for multipoint
data transmission.
The driver and receiver outputs feature TRI-STATE capabil-
ity. The driver outputs remain in TRI-STATE over the entire
common mode range of +12V to −7V. Bus faults that cause
excessive power dissipation within the device trigger a ther-
mal shutdown circuit, which forces the driver outputs into the
high impedance state. The DS3696 provides an output pin
TS (thermal shutdown) which reports the occurrence of the
thermal shutdown of the device. This is an “open collector”
pin with an internal 10 kΩpull-up resistor. This allows the line
fault outputs of several devices to be wire OR-ed.
Both AC and DC specifications are guaranteed over the 0˚C
to 70˚C temperature and 4.75V to 5.25V supply voltage
range.
Features
nMeets EIA standard RS485 for multipoint bus
transmission and is compatible with RS-422
n15 ns driver propagation delays with 2 ns skew (typical)
nSingle +5V supply
n−7V to +12V bus common mode range permits ±7V
ground difference between devices on the bus
nThermal shutdown protection
nHigh impedance to bus with driver in TRI-STATE or with
power off, over the entire common mode range allows
the unused devices on the bus to be powered down
nCombined impedance of a driver output and receiver
input is less than one RS485 unit load, allowing up to 32
transceivers on the bus
n70 mV typical receiver hysteresis
Connection and Logic Diagrams
01040801
Top View
01040812
Top View
01040813
Top View
Order Number DS3695N, DS3695TN, DS3696N, or DS3697NSee NS Package Number N08E
Note 1: TS pin was LF (Line Fault) in previous datasheets and reports the occurrence of a thermal shutdown of the device.
TRI-STATE®is a registered trademark of National Semiconductor Corporation.
May 1998
DS3695/DS3695T/DS3696/DS3697 Multipoint RS485/RS422 Transceivers/Repeaters
© 2004 National Semiconductor Corporation DS010408 www.national.com
Absolute Maximum Ratings (Note 2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage, V
CC
7V
Control Input Voltages 7V
Driver Input Voltage 7V
Driver Output Voltages +15V/−10V
Receiver Input Voltages
(DS3695, DS3696) +15V/−10V
Receiver Common Mode Voltage
(DS3697) ±25V
Receiver Output Voltage 5.5V
Continuous Power Dissipation @25˚C
N Package 1.07W (Note
4)
Storage Temperature Range −65˚C to
+150˚C
Lead Temperature (Soldering, 4
sec.) 260˚C
Recommended Operating
Conditions
Min Max Units
Supply Voltage, V
CC
4.75 5.25 V
Bus Voltage −7 +12 V
Operating Free Air Temp. (T
A
)
Commercial 0 +70 ˚C
Industrial −40 +85 ˚C
Electrical Characteristics (Notes 3, 4)
0˚C ≤T
A
≤+70˚C, 4.75V <V
CC
<5.25V unless otherwise specified
Symbol Parameter Conditions Min Typ Max Units
V
OD1
Differential Driver Output I
O
=0 5 V
Voltage (Unloaded)
V
OD2
Differential Driver Output (Figure 1 ) R=50Ω; (RS-422) (Note
6)
2V
Voltage (with Load) R = 27Ω; (RS-485) 1.5 V
∆V
OD
Change in Magnitude of Driver
Differential Output Voltage for 0.2 V
Complementary Output States
V
OC
Driver Common Mode Output Voltage (Figure 1 ) R=27Ω3.0 V
∆|V
OC
| Change in Magnitude of Driver
Common Mode Output Voltage 0.2 V
for Complementary Output States
V
IH
Input High Voltage 2V
V
IL
Input Low Voltage DI, DE, 0.8 V
V
CL
Input Clamp Voltage RE , E, RE /DE I
IN
= −18 mA −1.5 V
I
IL
Input Low Current V
IL
= 0.4V −200 µA
I
IH
Input High Current V
IH
= 2.4V 20 µA
I
IN
Input Current DO/RI, DO /RI V
CC
=0Vor
5.25V
V
IN
= 12V +1.0 mA
RI, RI RE /DE or DE =
0V
V
IN
= −7V −0.8 mA
I
OZD
TRI-STATE Current DO, DO V
CC
= 0V or 5.25V,E=0V ±100 µA
DS3697 & DS3698 −7V <V
O
<+12V
V
TH
Differential Input Threshold −7V ≤V
CM
≤+12V −0.2 +0.2 V
Voltage for Receiver
∆V
TH
Receiver Input Hysteresis V
CM
=0V 70 mV
V
OH
Receiver Output High Voltage I
OH
= −400 µA 2.4 V
V
OL
Output Low Voltage RO I
OL
= 16 mA (Note 6) 0.5 V
TS I
OL
= 8 mA 0.45 V
I
OZR
OFF-State (High Impedance) V
CC
= Max ±20 µA
Output Current at Receiver 0.4V ≤V
O
≤2.4V
R
IN
Receiver Input Resistance −7V ≤V
CM
≤+12V 12 kΩ
DS3695/DS3695T/DS3696/DS3697
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Electrical Characteristics (Notes 3, 4) (Continued)
0˚C ≤T
A
≤+70˚C, 4.75V <V
CC
<5.25V unless otherwise specified
Symbol Parameter Conditions Min Typ Max Units
I
CC
Supply Current No Load Driver Outputs Enabled 42 60 mA
(Note 6) Driver Outputs Disabled 27 40 mA
I
OSD
Driver Short-Circuit Output Current V
O
= −7V (Note 6) −250 mA
V
O
= +12V (Note 6) +250 mA
I
OSR
Receiver Short-Circuit Output Current V
O
= 0V −15 −85 mA
Note 2: “Absolute Maximum Ratings” are those beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the device should
be operated at these limits. The tables of “Electrical Characteristics” provide conditions for actual device operation.
Note 3: All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to device ground unless otherwise specified.
Note 4: All typicals are given for VCC = 5V and TA= 25˚C.
Note 5: Derate linearly at 11.1 mW/˚C to 570 mW at 70˚C.
Note 6: All limits for which Note 5 is applied must be derated by 10% for DS3695T and DS3696T. Other parameters remain the same for this extended temperature
range device (−40˚C ≤TA≤+85˚C).
Switching Characteristics (Notes 4, 7) 0˚C ≤T
A
≤+70˚C, 4.75V <V
CC
<5.25V unless otherwise speci-
fied
Receiver Switching Characteristics
(Figures 2, 3, 4)
Symbol Conditions Min Typ Max Units
t
PLH
C
L
=15pF 15 25 37 ns
t
PHL
S1 and S2 15 25 37 ns
|t
PLH
–t
PHL
| Closed 0 ns
t
PLZ
C
L
= 15 pF, S2 Open 5 12 16 ns
t
PHZ
C
L
= 15 pF, S1 Open 5 12 16 ns
t
PZL
C
L
= 15 pF, S2 Open 7 15 20 ns
t
PZH
C
L
= 15 pF, S1 Open 7 15 20 ns
Driver Switching Characteristics
Symbol Conditions Min Typ Max Units
SINGLE ENDED CHARACTERISTICS (Figures 5, 6, 7)
t
PLH
R
L
DIFF = 60Ω91522 ns
t
PHL
C
L1
=C
L2
= 100 pF 9 15 22 ns
t
SKEW
|t
PLH
–t
PHL
|28ns
t
PLZ
C
L
= 15 pF, S2 Open 7 15 30 ns
t
PHZ
C
L
= 15 pF, S1 Open 7 15 30 ns
t
PZL
C
L
= 100 pF, S2 Open 30 35 50 ns
t
PZH
C
L
= 100 pF, S1 Open 30 35 50 ns
DIFFERENTIAL CHARACTERISTICS (Figures 5, 8)
t
r
,t
f
R
L
DIFF = 60Ω61018 ns
C
L1
=C
L2
= 100 pF
Note 7: Switching Characteristics apply for DS3695, DS3695T, DS3696, DS3697 only.
DS3695/DS3695T/DS3696/DS3697
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AC Test Circuits and Switching Waveforms
01040815
FIGURE 1. Driver V
OD
and V
OC
01040803
FIGURE 2. Receiver Propagation Delay Test Circuit
01040804
Note: Differential input voltage may be realized by grounding RI and pulsing RI between +2.5V and −2.5V.
FIGURE 3. Receiver Input-to-Output Propagation Delay Timing
01040805
FIGURE 4. Receiver Enable/Disable Propagation Delay Timing
DS3695/DS3695T/DS3696/DS3697
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AC Test Circuits and Switching Waveforms (Continued)
01040806
Note: Unless otherwise specified the switches are closed.
01040807
FIGURE 5. Driver Propagation Delay and Transition Time Test Circuits
01040808
Note: tPLH and tPHL are measured to the respective 50% points. tSKEW is the difference between propagation delays of the complementary outputs.
FIGURE 6. Driver Input-to-Output Propagation Delay Timing (Single-Ended)
01040809
FIGURE 7. Driver Enable/Disable Propagation Delay Timing
DS3695/DS3695T/DS3696/DS3697
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AC Test Circuits and Switching Waveforms (Continued)
Function Tables
DS3695/DS3696 Transmitting
Inputs Thermal Outputs
RE DE DI Shutdown DO DO TS *
(DS3696 Only)
X 1 1 OFF 0 1 H
X 1 0 OFF 1 0 H
X 0 X OFF Z Z H
X1X ON ZZ L
DS3695/DS3696 Receiving
Inputs Outputs
RE DE RI–RI RO TS *
(DS3696 Only)
00≥+0.2V 1 H
00≤−0.2V 0 H
10 X Z H
DS3697
Inputs Thermal Outputs
E RI-RI Shutdown DO DO RO
(DS3697 Only)
1≥+0.2V OFF 0 1 1
1≤−0.2V OFF 1 0 0
0 X OFF Z Z Z
1≥+0.2V ON Z Z 1
1≤−0.2V ON Z Z 0
X — Don’t care condition
Z — High impedance state
*TS is an “open collector” output with an on-chip 10 kΩpull-up resistor that reports the occurrence of a thermal shutdown of the device.
01040810
FIGURE 8. Driver Differential Transition Timing
DS3695/DS3695T/DS3696/DS3697
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Typical Application
01040811
Note: Repeater control logic not shown, see AN-702.
Typical Performance Characteristics
Driver V
OH
vs
I
OH
vs Temperature Driver V
OH
vs I
OH
vs V
CC
Driver V
OH
vs I
OH
vs V
CC
01040819 01040820
Driver V
OL
vs
I
OL
vs Temperature Driver V
OH
vs I
OH
vs V
CC
01040821 01040822
DS3695/DS3695T/DS3696/DS3697
www.national.com7
Typical Performance Characteristics (Continued)
Driver Differential
Propagation
Delay vs Temperature
Driver Differential Propagation
Delay vs V
CC
01040823 01040824
Driver Single-Ended Propagation
Delay vs Temperature
Driver Single-Ended Propagation
Delay vs V
CC
01040825 01040826
Driver Transition Time
vs Temperature
Driver Transition Time
vs V
CC
01040827 01040828
DS3695/DS3695T/DS3696/DS3697
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Typical Performance Characteristics (Continued)
Cable Length vs Data Rate
Supply Current vs
Temperature
01040829 01040830
Supply Current vs Power
Supply Voltage
Driver I
CC
vs Switching
Frequency
01040831 01040832
Driver Short
Circuit Current
vs Temperature
Receiver V
OH
vs I
OH
vs Temperature
01040833
01040834
DS3695/DS3695T/DS3696/DS3697
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Typical Performance Characteristics (Continued)
Receiver V
OH
vs
I
OH
vs V
CC
Driver Short
Circuit Current
vs Temperature
01040835
01040833
Receiver V
OH
vs I
OH
vs Temperature
Receiver V
OH
vs
I
OH
vs V
CC
01040834 01040835
Receiver V
OL
vs I
OL
vs Temperature
Receiver V
OL
vs
I
OL
vs V
CC
01040836 01040837
DS3695/DS3695T/DS3696/DS3697
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Typical Performance Characteristics (Continued)
Receiver Differential
Propagation Delay
vs Temperature
Receiver Differential
Propagation Delay
vs V
CC
01040838 01040839
Receiver Short
Circuit Current
vs Temperature
Receiver Short
Circuit Current
vs Power Supply
01040840 01040841
Receiver Non-Inverting
Input Current
vs Temperature
Receiver Non-Inverting
Input Current vs
Power Supply Voltage
01040842 01040843
DS3695/DS3695T/DS3696/DS3697
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Typical Performance Characteristics (Continued)
Receiver Inverting
Input Current
vs Temperature
Receiver Inverting
Input Current vs
Power Supply Voltage
01040844 01040845
Hysteresis and Differential
Transition Voltage
vs Temperature
Hysteresis and
Differential Transition
Voltage vs V
CC
01040846 01040847
DS3695/DS3695T/DS3696/DS3697
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Physical Dimensions inches (millimeters) unless otherwise noted
8-Lead Molded Dual-In-Line Package (N)
Order Number DS3695N, DS3696N, DS3697N, or DS3695TN
NS Package Number N08E
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves
the right at any time without notice to change said circuitry and specifications.
For the most current product information visit us at www.national.com.
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DS3695/DS3695T/DS3696/DS3697 Multipoint RS485/RS422 Transceivers/Repeaters
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