Page 1
March 1996
DS3695/DS3695T/DS3696/DS3696T/DS3697/DS3698
Multipoint RS485/RS422 Transceivers/Repeaters
DS3695/DS3695T/DS3696/DS3696T/DS3697/DS3698
Multipoint RS485/RS422 Transceivers/Repeaters
General Description
The DS3695, DS3696, DS3697 and DS3698 are high speed
differential TRI-STATE
designed to meet the requirements of EIA standard RS485
with extended common mode range (
bus/line transceivers/repeaters
É
a
12V tob7V), 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
a
12V tob7V. 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 and DS3698
provide 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 kX 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
to 70
C temperature and 4.75V to 5.25V supply voltage
§
range.
Connection and Logic Diagrams
Top View
TL/F/10408– 1
Features
Y
Meets EIA standard RS485 for multipoint bus transmission and is compatible with RS-422
Y
15 ns driver propagation delays with 2 ns skew (typical)
Y
Singlea5V supply
Y
b
7V toa12V bus common mode range permitsg7V
ground difference between devices on the bus
Y
Thermal shutdown protection
Y
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
Y
Combined impedance of a driver output and receiver input is less than one RS485 unit load, allowing up to 32
transceivers on the bus
Y
70 mV typical receiver hysteresis
C
§
Top View
TL/F/10408– 12
Top View
TL/F/10408– 13
Top View
Order Number DS3695N, DS3696N, DS3697N, DS3698N,
DS3695TN, DS3696TN, DS3695TJ or DS3696TJ
See NS Package Number J08A or N08E
Note: TS pin was LF (Line Fault) in previous datasheets and reports the occurrence of a thermal shutdown of the device.
TRI-STATEÉis a registered trademark of National Semiconductor Corporation.
C
1996 National Semiconductor Corporation RRD-B30M76/Printed in U. S. A.
TL/F/10408
TL/F/10408– 14
http://www.national.com
Page 2
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
Continuous Power Dissipation
N Package 1.07W (Note 4)
Storage Temperature Range
Lead Temperature (Soldering, 4 sec.) 260
Control Input Voltages 7V
Driver Input Voltage 7V
a
Driver Output Voltages
Receiver Input Voltages
(DS3695, DS3696)
15V/b10V
a
15V/b10V
Receiver Common Mode Voltage
(DS3697, DS3698)
g
25V
Receiver Output Voltage 5.5V
Recommended Operating
Conditions
Supply Voltage, V
Bus Voltage
Operating Free Air Temp. (TA)
Commercial 0
CC
Industrial
Electrical Characteristics 0
CsT
§
s
a
70§C, 4.75VkV
A
k
5.25V unless otherwise specified (Notes2&3)
CC
Symbol Parameter Conditions Min Typ Max Units
V
V
DV
Differential Driver Output I
OD1
Voltage (Unloaded)
Differential Driver Output
OD2
Voltage (with Load)
Change in Magnitude of Driver
OD
Differential Output Voltage for 0.2 V
e
0
O
(Figure 1)
Re50X; (RS-422) (Note 5) 2 V
Re27X; (RS-485) 1.5 V
Complementary Output States
V
DlV
Driver Common Mode Output Voltage
OC
Change in Magnitude of Driver
l
OC
Common Mode Output Voltage 0.2 V
(Figure 1)
Re27X 3.0 V
for Complementary Output States
V
V
V
I
I
I
I
V
DV
V
V
I
R
I
Input High Voltage 2V
IH
Input Low Voltage
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
Differential Input Threshold
TH
Voltage for Receiver
Receiver Input Hysteresis V
TH
Receiver Output High Voltage I
OH
Output Low Voltage RO I
OL
RI, RI RE/DE or DEe0V
TS I
OFF-State (High Impedance) V
OZR
Output Current at Receiver 0.4V
Receiver Input Resistance
IN
Supply Current No Load Driver Outputs Enabled 42 60 mA
CC
DI, DE,
e
0V or 5.25V V
CC
e
0V or 5.25V, Ee0V
CC
b
b
CM
OH
OL
OL
CC
b
k
7VkV
7VsV
eb
e
e
7VsV
a
O
s
CM
e
0V 70 mV
400 mA 2.4 V
16 mA (Note 5) 0.5 V
8 mA 0.45 V
e
Max
s
s
V
2.4V
O
s
CM
(Note 5)
eb
18 mA
IN
e
0.4V
IL
e
2.4V 20 mA
IH
e
12V
IN
eb
V
7V
IN
12V
a
12V
a
12V 12 kX
Driver Outputs Disabled 27 40 mA
@
25§C
b
65§Ctoa150§C
Min Max Units
4.75 5.25 V
b
a
7
12 V
a
b
40
b
0.2
70
a
85
b
b
a
b
g
a
C
§
C
§
C
§
5V
0.8 V
1.5 V
200 mA
1.0 mA
0.8 mA
100 mA
0.2 V
g
20 mA
http://www.national.com 2
Page 3
Electrical Characteristics (Continued)
0
CsT
§
s
a
70§C, 4.75VkV
A
k
5.25V unless otherwise specified (Notes2&3)
CC
Symbol Parameter Conditions Min Typ Max Units
25§C.
O
V
O
O
eb
7V (Note 5)
ea
12V (Note 5)
e
0V
b
15
I
I
Driver Short-Circuit Output Current V
OSD
Receiver Short-Circuit Output Current V
OSR
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.
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 V
Note 4: Derate linearly at 11.1 mW/
Note 5: 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 (
b
40§CsT
s
a
85§C).
A
e
5V and T
CC
C to 570 mW at 70§C.
§
A
e
b
250 mA
a
250 mA
b
85 mA
Switching Characteristics
0§CsT
Receiver Switching Characteristics
s
a
A
70§C, 4.75VkV
k
5.25V unless otherwise specified (Notes 3, 6)
CC
(Figures 2, 3
and
4)
Symbol Conditions Min Typ Max Units
t
PLH
t
PHL
t
l
PLH–tPHL
t
PLZ
t
PHZ
t
PZL
t
PZH
l
e
C
15 pF 15 25 37 ns
L
S1 and S2
Closed
e
C
15 pF, S2 Open 5 12 16 ns
L
e
C
15 pF, S1 Open 5 12 16 ns
L
e
C
15 pF, S2 Open 7 15 20 ns
L
e
C
15 pF, S1 Open 7 15 20 ns
L
15 25 37 ns
0ns
Driver Switching Characteristics
Symbol Conditions Min Typ Max Units
SINGLE ENDED CHARACTERISTICS
t
PLH
t
PHL
t
t
l
SKEW
PLH–tPHL
t
PLZ
t
PHZ
t
PZL
t
PZH
l
DIFFERENTIAL CHARACTERISTICS (
tr,t
f
Note 6: Switching Characteristics apply for DS3695, DS3695T, DS3696, DS3696T, DS3697 only.
(Figures 5, 6
R
L
DIFF
e
C
L1
and
7)
e
60X 91522 ns
e
C
100 pF
L2
91522 ns
28ns
e
C
15 pF, S2 Open 7 15 30 ns
L
e
C
15 pF, S1 Open 7 15 30 ns
L
e
C
100 pF, S2 Open 30 35 50 ns
L
e
C
100 pF, S1 Open 30 35 50 ns
L
Figures 5
R
L
DIFF
C
L1
and8)
e
60X
e
e
C
100 pF
L2
61018 ns
http://www.national.com3
Page 4
AC Test Circuits and Switching Waveforms
FIGURE 1. Driver VODand V
TL/F/10408– 15
OC
FIGURE 2. Receiver Propagation Delay Test Circuit
Note: Differential input voltage may be realized by grounding RI and pulsing RI betweena2.5V andb2.5V.
FIGURE 3. Receiver Input-to-Output Propagation Delay Timing
TL/F/10408– 3
TL/F/10408– 4
FIGURE 4. Receiver Enable/Disable Propagation Delay Timing
http://www.national.com 4
TL/F/10408– 5
Page 5
AC Test Circuits and Switching Waveforms (Continued)
TL/F/10408– 6
Note: Unless otherwise specified the switches are closed.
FIGURE 5. Driver Propagation Delay and Transition Time Test Circuits
TL/F/10408– 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
TL/F/10408– 8
TL/F/10408– 9
TL/F/10408– 10
http://www.national.com5
Page 6
Function Tables
RE DE DI
X 1 1 OFF 0 1 H
X 1 0 OFF 1 0 H
X 0 X OFF Z Z H
X1X ON Z Z L
RE DE RI –RI RO
00
00
10 X Z H
Inputs
E RI-RI
t
1
s
1
0 X OFF Z Z Z H
t
1
s
1
XÐDon’t care condition
ZÐHigh impedance state
*TS
is an ‘‘open collector’’ output with an on-chip 10 kX pull-up resistor that reports the occurrence of a thermal shutdown of the device.
DS3695/DS3696 Transmitting
Inputs
Thermal
Shutdown
DO DO
Outputs
(DS3696 Only)
DS3695/DS3696 Receiving
Inputs Outputs
(DS3696 Only)
t
a
0.2V 1 H
s
b
0.2V 0 H
DS3697/DS3698
Thermal
Shutdown
a
0.2V OFF 0 1 1 H
b
0.2V OFF 1 0 0 H
a
0.2V ON Z Z 1 L
b
0.2V ON Z Z 0 L
DO DO
Outputs
RO TS
(DS3697 Only) (DS3698 Only)
TS
TS
*
*
*
Typical Application
Note: Repeater control logic not shown, see AN-702.
http://www.national.com 6
TL/F/10408– 11
Page 7
Typical Performance Characteristics
Driver V
IOHvs Temperature
Driver V
vs
OH
vs IOLvs V
OL
CC
Driver Single-Ended Propagation
Delay vs Temperature
Driver V
vs IOHvs V
OH
CC
Driver Differential Propagation
Delay vs Temperature
Driver Single-Ended Propagation
Delay vs V
CC
OL
vs
Driver V
IOLvs Temperature
Driver Differential Propagation
Delay vs V
CC
Driver Transition Time
vs Temperature
Driver Transition Time
vs V
CC
Cable Length vs Data Rate
TL/H/10408– 16
http://www.national.com7
Page 8
Typical Performance Characteristics (Continued)
Supply Current vs
Temperature
Driver Short
Circuit Current
vs Temperature
Receiver V
vs Temperature
OL
vs I
OL
Supply Current vs Power
Supply Voltage
Receiver V
vs Temperature
OH
vs I
OH
Receiver VOLvs
IOLvs V
CC
Driver I
Frequency
vs Switching
CC
Receiver VOHvs
IOHvs V
CC
Receiver Differential
Propagation Delay
vs Temperature
Receiver Differential
Propagation Delay
vs V
CC
http://www.national.com 8
Receiver Short
Circuit Current
vs Temperature
Receiver Short
Circuit Current
vs Power Supply
TL/H/10408– 17
Page 9
Typical Performance Characteristics (Continued)
Receiver Non-Inverting
Input Current
vs Temperature
Receiver Non-Inverting
Input Current vs
Power Supply Voltage
Receiver Inverting
Input Current
vs Temperature
Receiver Inverting
Input Current vs
Power Supply Voltage
Hysteresis and Differential
Transition Voltage
vs Temperature
Physical Dimensions inches (millimeters) unless otherwise noted
Hysteresis and
Differential Transition
Voltage vs V
CC
TL/H/10408– 18
8-Lead Ceramic Dual-In-Line Package (J)
Order Number DS3695TJ or DS3696TJ
NS Package Number J08A
http://www.national.com9
Page 10
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
Order Number DS3695N, DS3696N, DS3697N, DS3698N, DS3695TN or DS3696TN
8-Lead Molded Dual-In-Line Package (N)
NS Package Number N08E
Multipoint RS485/RS422 Transceivers/Repeaters
DS3695/DS3695T/DS3696/DS3696T/DS3697/DS3698
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 2. A critical component is any component of a life
systems which, (a) are intended for surgical implant support device or system whose failure to perform can
into the body, or (b) support or sustain life, and whose be reasonably expected to cause the failure of the life
failure to perform, when properly used in accordance support device or system, or to affect its safety or
with instructions for use provided in the labeling, can effectiveness.
be reasonably expected to result in a significant injury
to the user.
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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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