DS3695A,DS3695AT,DS3696A
DS3695A/DS3695AT/DS3696A Multipoint RS485/RS422 Transceivers
Literature Number: SNLS353B
DS3695A/DS3695AT/DS3696A
Multipoint RS485/RS422 Transceivers
General Description
The DS3695A and DS3696A are high speed differential
TRI-STATE®bus/line transceivers designed to meet the re-
quirements of EIA standard RS485 with extended common
mode range (+12V to −7V), for multipoint data transmission.
In addition they are compatible with requirements of RS-422.
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 DS3696A provides an output pin
(TS) which reports the thermal shutdown of the device. TS is
an “open collector” pin with an internal 10 kΩpull-up resistor.
This allows the TS 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
n10 ns driver propagation delays (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
nAvailable in SOIC packaging
Connection and Logic Diagram
Molded Package, Small Outline (M)
00527201
Top View
00527202
TS was LF (Line Fault) on previous datasheets, TS goes low upon thermal shutdown.
Top View
Order Number DS3695AM, DS3695ATM or DS3696AM
See NS Package Number M08A
TRI-STATE®is a registered trademark of National Semiconductor Corporation.
February 1996
DS3695A/DS3695AT/DS3696A Multipoint RS485/RS422 Transceivers
© 2004 National Semiconductor Corporation DS005272 www.national.com
Absolute Maximum Ratings (Note 1)
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 +15V/−10V
Receiver Output Voltage 5.5V
Continuous Power Dissipation @
25˚C
M Package 630 mW (Note 4)
Storage Temp. Range −65˚C to +150˚C
Lead Temp. (Soldering 4 seconds) 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 (DS3695AM) 0 +70 ˚C
Industrial (DS3695ATM) −40 +85 ˚C
Commercial (DS3696AM) 0 +70 ˚C
Electrical Characteristics (Notes 2, 3)
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 5V
Voltage (Unloaded)
V
OD2
Differential Driver Output R = 50Ω; (RS-422) (Note 5) 2 V
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 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 , 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
= 0V or 5.25V V
IN
= 12V +1.0 mA
RI, RI DE or RE /DE = 0V V
IN
= −7V −0.8 mA
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 5) 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
I
CC
Supply Current No Load Driver Outputs Enabled 42 60 mA
(Note 5) Driver Outputs Disabled 27 40 mA
I
OSD
Driver Short-Circuit V
O
= −7V (Note 5) −250 mA
Output Current V
O
= +12V (Note 5) +250 mA
I
OSR
Receiver Short-Circuit V
O
= 0V −15 −85 mA
Output Current
Note 1: “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.
DS3695A/DS3695AT/DS3696A
www.national.com 2
Note 2: 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 3: All typicals are given for VCC = 5V and TA= 25˚C.
Note 4: Derate linearly at 6.5 mW/˚C to 337 mW at 70˚C.
Note 5: All limits for which Note 5 is applied must be derated by 10% for DS3695AT. Other parameters remain the same for this extended temperature range device
(−40˚C ≤TA≤+85˚C).
Switching Characteristics
0˚C ≤T
A
≤70˚C, 4.75V <V
CC
<5.25V unless otherwise specified (Note 3)
Receiver Switching Characteristics
(Figures 1, 2 and Figure 3)
Symbol Conditions Min Typ Max Units
t
PLH
C
L
=15pF 15 28 42 ns
t
PHL
S1 and S2 15 28 42 ns
|t
PLH
–t
PHL
| Closed 0 3 ns
t
PLZ
C
L
= 15 pF, S2 Open 5 29 35 ns
t
PHZ
C
L
= 15 pF, S1 Open 5 12 16 ns
t
PZL
C
L
= 15 pF, S2 Open 7 15 28 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 4, 5 and Figure 7)
t
PLH
R
LDIFF
=60Ω91522ns
t
PHL
C
L1
=C
L2
= 100 pF 9 15 22 ns
t
SKEW
|t
PLH
–t
PHL
| 028ns
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 SWITCHING CHARACTERISTICS (Figure 7)
t
r
,t
f
R
LDIFF
=60Ω
C
L1
=C
L2
= 100 pF 61018ns
AC Test Circuits and Switching Waveforms
00527206
FIGURE 1. Receiver Propagation Delay Test Circuit
DS3695A/DS3695AT/DS3696A
www.national.com3
AC Test Circuits and Switching Waveforms (Continued)
00527207
Differential input voltage may be realized by grounding RI and pulsing RI between +2.5V and −2.5V
FIGURE 2. Receiver Input-to-Output Propagation Delay Timing
00527208
FIGURE 3. Receiver Enable/Disable Propagation Delay Timing
00527209
Unless otherwise specified the switches are closed.
00527210
FIGURE 4. Driver Propagation Delay Test Circuits
DS3695A/DS3695AT/DS3696A
www.national.com 4
AC Test Circuits and Switching Waveforms (Continued)
00527211
tPLH and tPHL are measured to the respective 50% points. tSKEW is the difference between propagation delays of the complementary outputs.
FIGURE 5. Driver Input-to-Output Propagation Delay Timing (Single-Ended)
00527212
FIGURE 6. Driver Enable/Disable Propagation Delay Timing
00527213
FIGURE 7. Driver Differential Transition Timing
DS3695A/DS3695AT/DS3696A
www.national.com5
Function Tables
DS3695A/DS3696A Transmitting
Inputs Line Outputs
RE DE DI Condition DO DO TS * (DS3696A Only)
X 1 1 No Fault 0 1 H
X 1 0 No Fault 1 0 H
X0X X ZZ H
X 1 X Fault Z Z L
DS3695A/DS3696A Receiving
Inputs Output
RE DE RI–RI RO TS * (DS3696A Only)
00 ≥+0.2V 1 H
00 ≤−0.2V 0 H
0 0 Inputs Open** 1 H
10 X Z H
X — Don’t care condition
Z — High impedance state
Fault — Improper line conditions causing excessive power dissipation in the driver, such as shorts or bus contention situations
* TS is an “open collector” output with an on-chip 10 kΩpull-up resistor.
** This is a fail safe condition
Typical Application
00527218
Repeater control logic not shown. See AN-702.
DS3695A/DS3695AT/DS3696A
www.national.com 6
Physical Dimensions inches (millimeters) unless otherwise noted
Molded SOIC Package (M)
Order Number DS3695AM, DS3695ATM or DS3696AM
NS Package Number M08A
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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NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS
WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR
CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body, or
(b) support or sustain life, and whose failure to perform when
properly used in accordance with instructions for use
provided in the labeling, can be reasonably expected to result
in a significant injury to the user.
2. A critical component is any component of a life support
device or system whose failure to perform can be reasonably
expected to cause the failure of the life support device or
system, or to affect its safety or effectiveness.
BANNED SUBSTANCE COMPLIANCE
National Semiconductor certifies that the products and packing materials meet the provisions of the Customer Products Stewardship
Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned
Substances’’ as defined in CSP-9-111S2.
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DS3695A/DS3695AT/DS3696A Multipoint RS485/RS422 Transceivers
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