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DS3695/DS3695T/DS3696/DS3697
Multipoint RS485/RS422 Transceivers/Repeaters
DS3695/DS3695T/DS3696/DS3697 Multipoint RS485/RS422 Transceivers/Repeaters
May 1998
General Description
The DS3695, DS3696, and DS3697 are high speed differential TRI-STATE
meet the requirementsofEIAstandard RS485 with extended
common mode range (+12V to −7V), for multipoint data
transmission.
The driver and receiver outputs feature TRI-STATE capability. 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 thermal 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 aninternal10 kΩ pull-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.
®
bus/line transceivers/repeaters designed to
Connection and Logic Diagrams
DS010408-1
Top View
Features
n Meets EIA standard RS485 for multipoint bus
transmission and is compatible with RS-422
n 15 ns driver propagation delays with 2 ns skew (typical)
n Single +5V supply
n −7V to +12V bus common mode range permits
ground difference between devices on the bus
n Thermal shutdown protection
n High 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
n Combined impedance of a driver output and receiver
input is less than one RS485 unit load, allowing up to 32
transceivers on the bus
n 70 mV typical receiver hysteresis
Top View
DS010408-12
±
7V
DS010408-13
Top View
Order Number DS3695N, DS3695TN,
DS3696N, or DS3697N
See 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.
© 1998 National Semiconductor Corporation DS010408 www.national.com
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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
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)
Receiver Output Voltage 5.5V
@
Continuous Power Dissipation
25˚C
N Package 1.07W (Note
7V
±
25V
Storage Temperature Range −65˚C to
Lead Temperature (Soldering, 4
sec.) 260˚C
+150˚C
Recommended Operating
Conditions
Min Max Units
)
A
4.75 5.25 V
Supply Voltage, V
CC
Bus Voltage −7 +12 V
Operating Free Air Temp. (T
Commercial 0 +70 ˚C
Industrial −40 +85 ˚C
4)
Electrical Characteristics (Notes 3, 4)
0˚C ≤ TA≤ +70˚C, 4.75V<V
Symbol Parameter Conditions Min Typ Max Units
V
Differential Driver Output I
OD1
Voltage (Unloaded)
V
Differential Driver Output (
OD2
Voltage (with Load) R=27Ω; (RS-485) 1.5 V
∆V
Change in Magnitude of Driver
OD
Differential Output Voltage for 0.2 V
Complementary Output States
V
∆|V
Driver Common Mode Output Voltage (
OC
| Change in Magnitude of Driver
OC
Common Mode Output Voltage 0.2 V
for Complementary Output States
V
V
V
I
I
I
I
Input High Voltage 2V
IH
Input Low Voltage DI, DE, 0.8 V
IL
Input Clamp Voltage RE , E, RE /DE I
CL
Input Low Current V
IL
Input High Current V
IH
Input Current DO/RI, DO /RI V
IN
TRI-STATE Current DO, DO V
OZD
DS3697 & DS3698 −7V
V
Differential Input Threshold −7V ≤ VCM≤ +12V −0.2 +0.2 V
TH
Voltage for Receiver
∆V
V
V
I
Receiver Input Hysteresis V
TH
Receiver Output High Voltage I
OH
Output Low Voltage RO I
OL
OFF-State (High Impedance) V
OZR
Output Current at Receiver 0.4V ≤ V
R
Receiver Input Resistance −7V ≤ VCM≤ +12V 12 kΩ
IN
<
5.25V unless otherwise specified
CC
O
Figure 1
Figure 1
CC
5.25V
RI, RI
TS
RE /DE or DE
0V
CC
CM
OH
OL
I
OL
CC
=
05V
=
+12V
=
50Ω; (RS-422) (Note6)2V
=
27Ω 3.0 V
=
−18 mA −1.5 V
IN
=
0.4V −200 µA
IL
=
2.4V 20 µA
IH
=
V
12V +1.0 mA
IN
=
V
−7V −0.8 mA
IN
±
100 µA
±
20 µA
)R
)R
=
0V or
=
0V or 5.25V, E=0V
<
<
V
O
=
0V 70 mV
=
−400 µA 2.4 V
=
16 mA (Note 6) 0.5 V
=
8 mA 0.45 V
=
Max
≤ 2.4V
O
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Page 3
Electrical Characteristics (Notes 3, 4) (Continued)
0˚C ≤ TA≤ +70˚C, 4.75V<V
Symbol Parameter Conditions Min Typ Max Units
I
I
I
Supply Current No Load Driver Outputs Enabled 42 60 mA
CC
Driver Short-Circuit Output Current V
OSD
Receiver Short-Circuit Output Current V
OSR
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: Allcurrents 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 V
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 ≤ T
≤ +85˚C).
A
<
5.25V unless otherwise specified
CC
=
CC
5V and T
=
25˚C.
A
(Note 6) Driver Outputs Disabled 27 40 mA
=
−7V (Note 6) −250 mA
O
=
V
+12V (Note 6) +250 mA
O
=
0V −15 −85 mA
O
Switching Characteristics (Notes 4, 7) 0˚C ≤ T
≤ +70˚C, 4.75V<V
A
<
5.25V unless otherwise specified
CC
Receiver Switching Characteristics
(
Figures 2, 3, 4
)
Symbol Conditions Min Typ Max Units
=
t
PLH
t
PHL
|t
PLH–tPHL
t
PLZ
t
PHZ
t
PZL
t
PZH
| Closed 0 ns
C
15 pF 15 25 37 ns
L
S1 and S2 15 25 37 ns
=
C
15 pF, S2 Open 5 12 16 ns
L
=
C
15 pF, S1 Open 5 12 16 ns
L
=
C
15 pF, S2 Open 7 15 20 ns
L
=
C
15 pF, S1 Open 7 15 20 ns
L
Driver Switching Characteristics
Symbol Conditions Min Typ Max Units
SINGLE ENDED CHARACTERISTICS (
t
PLH
t
PHL
t
SKEW|tPLH–tPHL
t
PLZ
t
PHZ
t
PZL
t
PZH
|28ns
RLDIFF=60Ω 91522 ns
C
C
C
C
C
DIFFERENTIAL CHARACTERISTICS (
t
r,tf
RLDIFF=60Ω 61018 ns
C
Note 7: Switching Characteristics apply for DS3695, DS3695T, DS3696, DS3697 only.
Figures 5, 6, 7
=
=
C
L1
=
L
=
L
=
L
=
L
100 pF 9 15 22 ns
L2
15 pF, S2 Open 7 15 30 ns
15 pF, S1 Open 7 15 30 ns
100 pF, S2 Open 30 35 50 ns
100 pF, S1 Open 30 35 50 ns
Figures 5, 8
=
=
C
L1
100 pF
L2
)
)
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AC Test Circuits and Switching Waveforms
FIGURE 1. Driver VODand V
FIGURE 2. Receiver Propagation Delay Test Circuit
DS010408-15
OC
DS010408-3
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
FIGURE 4. Receiver Enable/Disable Propagation Delay Timing
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DS010408-4
DS010408-5
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AC Test Circuits and Switching Waveforms (Continued)
DS010408-6
Note: Unless otherwise specified the switches are closed.
FIGURE 5. Driver Propagation Delay and Transition Time Test Circuits
DS010408-7
Note: t
PLH
and t
are measured to the respective 50%points. t
PHL
FIGURE 6. Driver Input-to-Output Propagation Delay Timing (Single-Ended)
FIGURE 7. Driver Enable/Disable Propagation Delay Timing
is the difference between propagation delays of the complementary outputs.
SKEW
FIGURE 8. Driver Differential Transition Timing
DS010408-8
DS010408-9
DS010408-10
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Page 6
Function Tables
DS3695/DS3696 Transmitting
Inputs Thermal Outputs
RE
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
DE DI Shutdown DO DO TS
DS3695/DS3696 Receiving
Inputs Outputs
RE
00≥+0.2V 1 H
00≤−0.2V 0 H
10 X Z H
DE RI–RI RO TS
DS3697
Inputs Thermal Outputs
E RI-RI
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 kΩ pull-up resistor that reports the occurrence of a thermal shutdown of the device.
Shutdown DO DO RO
*
(DS3696 Only)
*
(DS3696 Only)
(DS3697 Only)
Typical Application
Note: Repeater control logic not shown, see AN-702.
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DS010408-11
Page 7
Typical Performance Characteristics
Driver VOHvs
I
vs Temperature
OH
Driver VOHvs IOHvs V
CC
DS010408-19
DS010408-22
Driver VOHvs IOHvs VCCDriver
V
vs IOHvs V
OH
CC
DS010408-20
Driver Differential
Propagation
Delay vs Temperature
DS010408-23
Driver VOLvs
I
vs Temperature
OL
DS010408-21
Driver Differential Propagation
Delay vs V
CC
DS010408-24
Driver Single-Ended Propagation
Delay vs Temperature
DS010408-25
Driver Single-Ended Propagation
Delay vs V
CC
DS010408-26
Driver Transition Time
vs Temperature
DS010408-27
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Page 8
Typical Performance Characteristics (Continued)
Driver Transition Time
vs V
CC
Cable Length vs Data Rate
Supply Current vs
Temperature
Driver Short
Circuit Current
vs Temperature
DS010408-30
DS010408-28
Supply Current vs Power
Supply Voltage
Receiver VOHvs I
vs Temperature
DS010408-29
Driver ICCvs Switching
Frequency
DS010408-31
OH
Receiver VOHvs
I
vs V
OH
CC
DS010408-32
DS010408-33
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DS010408-34
DS010408-35
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Typical Performance Characteristics (Continued)
Receiver V
vs Temperature
vs I
OL
OL
Receiver Differential
Propagation Delay
vs V
CC
DS010408-36
Receiver VOLvs
I
vs V
OL
CC
Receiver Short
Circuit Current
vs Temperature
Receiver Differential
Propagation Delay
vs Temperature
DS010408-37
DS010408-38
Receiver Short
Circuit Current
vs Power Supply
Receiver Non-Inverting
Input Current
vs Temperature
DS010408-39
DS010408-42
Receiver Non-Inverting
Input Current vs
Power Supply Voltage
DS010408-40
DS010408-43
DS010408-41
Receiver Inverting
Input Current
vs Temperature
DS010408-44
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Typical Performance Characteristics (Continued)
Receiver Inverting
Input Current vs
Power Supply Voltage
DS010408-45
Hysteresis and Differential
Transition Voltage
vs Temperature
DS010408-46
Hysteresis and
Differential Transition
Voltage vs V
CC
DS010408-47
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Physical Dimensions inches (millimeters) unless otherwise noted
Order Number DS3695N, DS3696N, DS3697N, or DS3695TN
8-Lead Molded Dual-In-Line Package (N)
NS Package Number N08E
LIFE SUPPORT POLICY
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 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 fail-
DS3695/DS3695T/DS3696/DS3697 Multipoint RS485/RS422 Transceivers/Repeaters
ure to perform when properly used in accordance
2. A critical component in 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.
with instructions for use provided in the labeling, can
be reasonably expected to result in a significant injury
to the user.
National Semiconductor
Corporation
Americas
Tel: 1-800-272-9959
Fax: 1-800-737-7018
Email: support@nsc.com
www.national.com
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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.
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