NSC DS3695N Multipoint rs485/rs422 transceivers/repeater Datasheet

DS3695/DS3695T/DS3696/DS3697
Multipoint RS485/RS422 Transceivers/Repeaters
General Description
Features
The DS3695, DS3696, and DS3697 are high speed differential TRI-STATE ® bus/line transceivers/repeaters designed to
meet the requirements of EIA standard 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 an internal 10 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.
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 ± 7V
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
Connection and Logic Diagrams
DS010408-1
Top View
DS010408-12
Top View
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
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DS3695/DS3695T/DS3696/DS3697 Multipoint RS485/RS422 Transceivers/Repeaters
May 1998
Absolute Maximum Ratings (Note 2)
Storage Temperature Range
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Lead Temperature (Soldering, 4
sec.)
Supply Voltage, VCC
Control Input Voltages
Driver Input Voltage
Driver Output Voltages
Receiver Input Voltages
(DS3695, DS3696)
Receiver Common Mode Voltage
(DS3697)
Receiver Output Voltage
Continuous Power Dissipation @ 25˚C
N Package
−65˚C to
+150˚C
260˚C
Recommended Operating
Conditions
7V
7V
7V
+15V/−10V
Supply Voltage, VCC
Bus Voltage
Operating Free Air Temp. (TA)
Commercial
Industrial
+15V/−10V
± 25V
5.5V
Min
4.75
−7
Max
5.25
+12
Units
V
V
0
−40
+70
+85
˚C
˚C
1.07W (Note
4)
Electrical Characteristics (Notes 3, 4)
0˚C ≤ TA ≤ +70˚C, 4.75V < VCC < 5.25V unless otherwise specified
Symbol
VOD1
Parameter
Conditions
Min
Typ
IO = 0
Differential Driver Output
Max
Units
5
V
Voltage (Unloaded)
VOD2
R = 50Ω; (RS-422) (Note
6)
R = 27Ω; (RS-485)
(Figure 1 )
Differential Driver Output
Voltage (with Load)
∆VOD
2
V
1.5
V
Change in Magnitude of Driver
Differential Output Voltage for
0.2
V
3.0
V
0.2
V
0.8
V
Complementary Output States
VOC
Driver Common Mode Output Voltage
∆|VOC|
Change in Magnitude of Driver
R = 27Ω
(Figure 1 )
Common Mode Output Voltage
for Complementary Output States
VIH
Input High Voltage
VIL
Input Low Voltage
VCL
Input Clamp Voltage
IIL
Input Low Current
IIH
Input High Current
IIN
Input Current
2
RE , E, RE /DE
DO/RI, DO /RI
RI, RI
IOZD
VTH
TRI-STATE Current
V
DI, DE,
DO, DO
VCC = 0V or
5.25V
IIN = −18 mA
VIL = 0.4V
−1.5
V
−200
µA
VIH = 2.4V
VIN = 12V
20
µA
+1.0
mA
−0.8
mA
± 100
µA
+0.2
V
RE /DE or DE = VIN = −7V
0V
VCC = 0V or 5.25V, E = 0V
DS3697 & DS3698
−7V < VO < +12V
Differential Input Threshold
−7V ≤ VCM ≤ +12V
−0.2
Voltage for Receiver
∆VTH
Receiver Input Hysteresis
VOH
Receiver Output High Voltage
VOL
Output Low Voltage
RO
TS
IOZR
RIN
VCM = 0V
IOH = −400 µA
IOL = 16 mA (Note 6)
IOL = 8 mA
OFF-State (High Impedance)
VCC = Max
Output Current at Receiver
0.4V ≤ VO ≤ 2.4V
Receiver Input Resistance
−7V ≤ VCM ≤ +12V
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2
70
mV
2.4
12
V
0.5
V
0.45
V
± 20
µA
kΩ
Electrical Characteristics (Notes 3, 4)
(Continued)
0˚C ≤ TA ≤ +70˚C, 4.75V < VCC < 5.25V unless otherwise specified
Symbol
Typ
Max
Units
Supply Current
No Load
Driver Outputs Enabled
42
60
mA
27
40
mA
IOSD
Driver Short-Circuit Output Current
(Note 6)
Driver Outputs Disabled
VO = −7V (Note 6)
VO = +12V (Note 6)
−250
mA
IOSR
Receiver Short-Circuit Output Current
VO = 0V
ICC
Parameter
Conditions
Min
−15
+250
mA
−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 ≤ TA ≤ +70˚C, 4.75V < VCC < 5.25V unless otherwise specified
Receiver Switching Characteristics
(Figures 2, 3, 4)
tPLH
Symbol
Conditions
CL = 15 pF
Min
Typ
Max
Units
15
25
37
tPHL
ns
S1 and S2
15
25
37
|tPLH–tPHL|
0
tPZL
Closed
CL = 15 pF, S2 Open
CL = 15 pF, S1 Open
CL = 15 pF, S2 Open
tPZH
CL = 15 pF, S1 Open
tPLZ
tPHZ
ns
ns
5
12
16
ns
5
12
16
ns
7
15
20
ns
7
15
20
ns
Driver Switching Characteristics
Symbol
Conditions
Min
SINGLE ENDED CHARACTERISTICS (Figures 5, 6, 7)
tPLH
RLDIFF = 60Ω
Typ
Max
Units
9
15
22
ns
CL1 = CL2 = 100 pF
9
15
22
ns
2
8
ns
7
15
30
ns
7
15
30
ns
tPZL
CL = 15 pF, S2 Open
CL = 15 pF, S1 Open
CL = 100 pF, S2 Open
30
35
50
ns
tPZH
CL = 100 pF, S1 Open
30
35
50
ns
6
10
18
ns
tPHL
tSKEW|tPLH–tPHL|
tPLZ
tPHZ
DIFFERENTIAL CHARACTERISTICS (Figures 5, 8)
tr, tf
RLDIFF = 60Ω
CL1 = CL2 = 100 pF
Note 7: Switching Characteristics apply for DS3695, DS3695T, DS3696, DS3697 only.
3
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AC Test Circuits and Switching Waveforms
DS010408-15
FIGURE 1. Driver VOD and VOC
DS010408-3
FIGURE 2. Receiver Propagation Delay Test Circuit
DS010408-4
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
DS010408-5
FIGURE 4. Receiver Enable/Disable Propagation Delay Timing
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4
AC Test Circuits and Switching Waveforms
(Continued)
DS010408-7
DS010408-6
Note: Unless otherwise specified the switches are closed.
FIGURE 5. Driver Propagation Delay and Transition Time Test Circuits
DS010408-8
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)
DS010408-9
FIGURE 7. Driver Enable/Disable Propagation Delay Timing
DS010408-10
FIGURE 8. Driver Differential Transition Timing
5
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Function Tables
DS3695/DS3696 Transmitting
Inputs
RE
Thermal
DE
DI
Outputs
Shutdown
DO
TS *
DO
(DS3696 Only)
X
1
1
OFF
0
1
X
1
0
OFF
1
0
H
H
X
0
X
OFF
Z
Z
H
X
1
X
ON
Z
Z
L
DS3695/DS3696 Receiving
Inputs
RE
Outputs
DE
RI–RI
TS *
RO
(DS3696 Only)
0
0
≥ +0.2V
1
0
0
≤ −0.2V
0
H
1
0
X
Z
H
H
DS3697
Inputs
E
RI-RI
Thermal
Shutdown
Outputs
DO
DO
RO
(DS3697 Only)
1
≥ +0.2V
OFF
0
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
1
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.
Typical Application
DS010408-11
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 VCCDriver
VOH vs IOH vs VCC
DS010408-19
DS010408-20
Driver Differential
Propagation
Delay vs Temperature
Driver VOH vs IOH vs VCC
Driver VOL vs
IOL vs Temperature
DS010408-21
Driver Differential Propagation
Delay vs VCC
DS010408-22
DS010408-23
Driver Single-Ended Propagation
Delay vs Temperature
Driver Single-Ended Propagation
Delay vs VCC
DS010408-25
DS010408-24
Driver Transition Time
vs Temperature
DS010408-26
DS010408-27
7
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Typical Performance Characteristics
(Continued)
Driver Transition Time
vs VCC
Cable Length vs Data Rate
DS010408-29
DS010408-28
Supply Current vs
Temperature
Supply Current vs Power
Supply Voltage
DS010408-30
Driver Short
Circuit Current
vs Temperature
Driver ICC vs Switching
Frequency
Receiver VOH vs IOH
vs Temperature
Receiver VOH vs
IOH vs VCC
DS010408-34
DS010408-33
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DS010408-32
DS010408-31
8
DS010408-35
Typical Performance Characteristics
Receiver VOL vs IOL
vs Temperature
(Continued)
Receiver Differential
Propagation Delay
vs Temperature
Receiver VOL vs
IOL vs VCC
DS010408-36
DS010408-37
DS010408-38
Receiver Differential
Propagation Delay
vs VCC
Receiver Short
Circuit Current
vs Temperature
Receiver Short
Circuit Current
vs Power Supply
DS010408-40
DS010408-41
DS010408-39
Receiver Non-Inverting
Input Current
vs Temperature
Receiver Non-Inverting
Input Current vs
Power Supply Voltage
DS010408-42
Receiver Inverting
Input Current
vs Temperature
DS010408-43
9
DS010408-44
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Typical Performance Characteristics
Receiver Inverting
Input Current vs
Power Supply Voltage
(Continued)
Hysteresis and Differential
Transition Voltage
vs Temperature
DS010408-45
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DS010408-46
10
Hysteresis and
Differential Transition
Voltage vs VCC
DS010408-47
11
DS3695/DS3695T/DS3696/DS3697 Multipoint RS485/RS422 Transceivers/Repeaters
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
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