NSC DS3696TN Multipoint rs485/rs422 transceivers/repeater Datasheet

DS3695/DS3695T/DS3696/DS3696T/DS3697/DS3698
Multipoint RS485/RS422 Transceivers/Repeaters
General Description
Features
The DS3695, DS3696, DS3697 and DS3698 are high speed
differential TRI-STATEÉ bus/line transceivers/repeaters
designed to meet the requirements of EIA standard RS485
with extended common mode range ( a 12V to b7V), 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 to b7V. 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§ C
to 70§ C temperature and 4.75V to 5.25V supply voltage
range.
Y
Y
Y
Y
Y
Y
Y
Y
Meets EIA standard RS485 for multipoint bus transmission and is compatible with RS-422
15 ns driver propagation delays with 2 ns skew (typical)
Single a 5V supply
b 7V to a 12V bus common mode range permits g 7V
ground difference between devices on the bus
Thermal shutdown protection
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
Combined impedance of a driver output and receiver input is less than one RS485 unit load, allowing up to 32
transceivers on the bus
70 mV typical receiver hysteresis
Connection and Logic Diagrams
TL/F/10408 – 1
Top View
TL/F/10408 – 12
Top View
TL/F/10408 – 13
Top View
TL/F/10408 – 14
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-STATEÉ is a registered trademark of National Semiconductor Corporation.
C1996 National Semiconductor Corporation
TL/F/10408
RRD-B30M76/Printed in U. S. A.
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DS3695/DS3695T/DS3696/DS3696T/DS3697/DS3698
Multipoint RS485/RS422 Transceivers/Repeaters
March 1996
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
Continuous Power Dissipation
N Package
Storage Temperature Range
Supply Voltage, VCC
7V
7V
7V
a 15V/ b 10V
Lead Temperature (Soldering, 4 sec.)
a 15V/ b 10V
Supply Voltage, VCC
Control Input Voltages
Driver Input Voltage
Driver Output Voltages
Receiver Input Voltages
(DS3695, DS3696)
Receiver Common Mode Voltage
(DS3697, DS3698)
25§ C
1.07W (Note 4)
b 65§ C to a 150§ C
260§ C
Recommended Operating
Conditions
Bus Voltage
Operating Free Air Temp. (TA)
Commercial
Industrial
g 25V
Receiver Output Voltage
@
5.5V
Min
4.75
b7
Max
5.25
a 12
Units
V
V
0
a 70
a 85
§C
§C
b 40
Electrical Characteristics 0§ C s TA s a 70§ C, 4.75V k VCC k 5.25V unless otherwise specified (Notes 2 & 3)
Symbol
Parameter
Conditions
VOD1
Differential Driver Output
Voltage (Unloaded)
IO e 0
VOD2
Differential Driver Output
Voltage (with Load)
(Figure 1)
DVOD
R e 50X; (RS-422) (Note 5)
R e 27X; (RS-485)
Min
Typ
Driver Common Mode Output Voltage
D lVOCl
Change in Magnitude of Driver
Common Mode Output Voltage
for Complementary Output States
VIH
Input High Voltage
VIL
Input Low Voltage
VCL
Input Clamp Voltage
(Figure 1)
Units
5
V
2
V
1.5
V
Change in Magnitude of Driver
Differential Output Voltage for
Complementary Output States
VOC
Max
0.2
V
3.0
V
0.2
V
0.8
V
IIN e b18 mA
b 1.5
V
b 200
mA
20
mA
a 1.0
mA
b 0.8
mA
g 100
mA
a 0.2
V
R e 27X
2
DI, DE,
RE, E, RE/DE
IIL
Input Low Current
VIL e 0.4V
IIH
Input High Current
VIH e 2.4V
IIN
Input Current
DO/RI, DO/RI
RI, RI
VCC e 0V or 5.25V VIN e 12V
RE/DE or DE e 0V V e b7V
IN
DO, DO
VCC e 0V or 5.25V, E e 0V
b 7V k VO k a 12V
IOZD
TRI-STATE Current
DS3697 & DS3698
VTH
Differential Input Threshold
Voltage for Receiver
b 7V s VCM s a 12V
V
b 0.2
DVTH
Receiver Input Hysteresis
VCM e 0V
VOH
Receiver Output High Voltage
IOH e b400 mA
70
VOL
Output Low Voltage
RO
IOL e 16 mA (Note 5)
0.5
V
TS
IOL e 8 mA
0.45
V
g 20
mA
IOZR
OFF-State (High Impedance)
Output Current at Receiver
VCC e Max
0.4V s VO s 2.4V
RIN
Receiver Input Resistance
b 7V s VCM s a 12V
ICC
Supply Current
No Load
(Note 5)
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2
mV
2.4
V
12
kX
Driver Outputs Enabled
42
60
mA
Driver Outputs Disabled
27
40
mA
Electrical Characteristics (Continued)
0§ C s TA s a 70§ C, 4.75V k VCC k 5.25V unless otherwise specified (Notes 2 & 3)
Symbol
Parameter
IOSD
Conditions
Driver Short-Circuit Output Current
IOSR
Receiver Short-Circuit Output Current
Max
Units
VO e b7V (Note 5)
Min
b 250
mA
VO e a 12V (Note 5)
a 250
mA
b 85
mA
VO e 0V
b 15
Typ
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 VCC e 5V and TA e 25§ C.
Note 4: Derate linearly at 11.1 mW/§ C to 570 mW at 70§ C.
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§ C s TA s a 85§ C).
Switching Characteristics
0§ C s TA s a 70§ C, 4.75V k VCC k 5.25V unless otherwise specified (Notes 3, 6)
Receiver Switching Characteristics (Figures 2, 3 and 4)
Symbol
tPLH
tPHL
ltPLH –tPHLl
Conditions
CL e 15 pF
S1 and S2
Closed
Min
Typ
Max
Units
15
25
37
ns
15
25
37
ns
0
ns
tPLZ
CL e 15 pF, S2 Open
5
12
16
ns
tPHZ
CL e 15 pF, S1 Open
5
12
16
ns
tPZL
CL e 15 pF, S2 Open
7
15
20
ns
tPZH
CL e 15 pF, S1 Open
7
15
20
ns
Driver Switching Characteristics
Symbol
Conditions
Min
Typ
Max
Units
9
15
22
ns
9
15
22
ns
2
8
ns
SINGLE ENDED CHARACTERISTICS (Figures 5, 6 and 7)
tPLH
tPHL
RLDIFF e 60X
CL1 e CL2 e 100 pF
tSKEWltPLH – tPHLl
tPLZ
CL e 15 pF, S2 Open
7
15
30
ns
tPHZ
CL e 15 pF, S1 Open
7
15
30
ns
tPZL
CL e 100 pF, S2 Open
30
35
50
ns
tPZH
CL e 100 pF, S1 Open
30
35
50
ns
6
10
18
ns
DIFFERENTIAL CHARACTERISTICS (Figures 5 and 8 )
tr, tf
RLDIFF e 60X
CL1 e CL2 e 100 pF
Note 6: Switching Characteristics apply for DS3695, DS3695T, DS3696, DS3696T, DS3697 only.
3
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AC Test Circuits and Switching Waveforms
TL/F/10408–15
FIGURE 1. Driver VOD and VOC
TL/F/10408 – 3
FIGURE 2. Receiver Propagation Delay Test Circuit
TL/F/10408 – 4
Note: Differential input voltage may be realized by grounding RI and pulsing RI between a 2.5V and b 2.5V.
FIGURE 3. Receiver Input-to-Output Propagation Delay Timing
TL/F/10408 – 5
FIGURE 4. Receiver Enable/Disable Propagation Delay Timing
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4
AC Test Circuits and Switching Waveforms (Continued)
TL/F/10408 – 7
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 – 8
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)
TL/F/10408 – 9
FIGURE 7. Driver Enable/Disable Propagation Delay Timing
TL/F/10408 – 10
FIGURE 8. Driver Differential Transition Timing
5
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Function Tables
DS3695/DS3696 Transmitting
Inputs
RE
DE
DI
Thermal
Shutdown
X
X
X
X
1
1
0
1
1
0
X
X
OFF
OFF
OFF
ON
Outputs
DO
DO
TS*
(DS3696 Only)
0
1
Z
Z
1
0
Z
Z
H
H
H
L
DS3695/DS3696 Receiving
Inputs
Outputs
RE
DE
RI–RI
RO
TS*
(DS3696 Only)
0
0
1
0
0
0
t a 0.2V
s b 0.2V
1
0
Z
H
H
H
X
DS3697/DS3698
Inputs
E
RI-RI
1
1
0
1
1
t a 0.2V
s b 0.2V
X
t a 0.2V
s b 0.2V
Thermal
Shutdown
OFF
OFF
OFF
ON
ON
Outputs
DO
DO
RO
(DS3697 Only)
TS*
(DS3698 Only)
0
1
Z
Z
Z
1
0
Z
Z
Z
1
0
Z
1
0
H
H
H
L
L
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.
Typical Application
TL/F/10408 – 11
Note: Repeater control logic not shown, see AN-702.
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6
Typical Performance Characteristics
Driver VOH vs
IOH vs Temperature
Driver VOH vs IOH vs VCC
Driver VOL vs
IOL vs Temperature
Driver VOL vs IOL vs VCC
Driver Differential Propagation
Delay vs Temperature
Driver Differential Propagation
Delay vs VCC
Driver Single-Ended Propagation
Delay vs Temperature
Driver Single-Ended Propagation
Delay vs VCC
Driver Transition Time
vs Temperature
Driver Transition Time
vs VCC
Cable Length vs Data Rate
TL/H/10408 – 16
7
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Typical Performance Characteristics
(Continued)
Supply Current vs
Temperature
Supply Current vs Power
Supply Voltage
Driver ICC vs Switching
Frequency
Driver Short
Circuit Current
vs Temperature
Receiver VOH vs IOH
vs Temperature
Receiver VOH vs
IOH vs VCC
Receiver VOL vs IOL
vs Temperature
Receiver VOL vs
IOL vs VCC
Receiver Differential
Propagation Delay
vs Temperature
Receiver Differential
Propagation Delay
vs VCC
Receiver Short
Circuit Current
vs Temperature
Receiver Short
Circuit Current
vs Power Supply
TL/H/10408 – 17
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8
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
Hysteresis and
Differential Transition
Voltage vs VCC
TL/H/10408 – 18
Physical Dimensions inches (millimeters) unless otherwise noted
8-Lead Ceramic Dual-In-Line Package (J)
Order Number DS3695TJ or DS3696TJ
NS Package Number J08A
9
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DS3695/DS3695T/DS3696/DS3696T/DS3697/DS3698
Multipoint RS485/RS422 Transceivers/Repeaters
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
8-Lead Molded Dual-In-Line Package (N)
Order Number DS3695N, DS3696N, DS3697N, DS3698N, DS3695TN or DS3696TN
NS Package Number N08E
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