DS3696T [NSC]
Multipoint RS485/RS422 Transceivers/Repeaters; 多点RS485 / RS422收发器/转发器
| 型号： | DS3696T |
| 厂家： | 
National Semiconductor |
| 描述： | Multipoint RS485/RS422 Transceivers/Repeaters |
| 文件： | 总10页 (文件大小：251K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
March 1996
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 bus/line transceivers/repeaters
É
designed to meet the requirements of EIA standard RS485
Features
Y
Meets EIA standard RS485 for multipoint bus transmis-
sion and is compatible with RS-422
Y
15 ns driver propagation delays with 2 ns skew (typical)
a
b
g
7V to 12V bus common mode range permits 7V
ground difference between devices on the bus
a
b
Y
with extended common mode range ( 12V to 7V), for
multipoint data transmission.
Single 5V supply
a
Y
The driver and receiver outputs feature TRI-STATE capabili-
ty. The driver outputs remain in TRI-STATE over the entire
Y
Y
Thermal shutdown protection
a
b
7V. Bus faults that
common mode range of
12V to
High impedance to bus with driver in TRI-STATE or
with power off, over the entire common mode range al-
lows the unused devices on the bus to be powered
down
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.
Y
Y
Combined impedance of a driver output and receiver in-
put is less than one RS485 unit load, allowing up to 32
transceivers on the bus
70 mV typical receiver hysteresis
Both AC and DC specifications are guaranteed over the 0 C
§
to 70 C temperature and 4.75V to 5.25V supply voltage
§
range.
Connection and Logic Diagrams
TL/F/10408–1
TL/F/10408–12
Top View
Top View
TL/F/10408–13
TL/F/10408–14
Top View
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.
C
1996 National Semiconductor Corporation
TL/F/10408
RRD-B30M76/Printed in U. S. A.
http://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.
@
Continuous Power Dissipation 25 C
§
N Package
1.07W (Note 4)
b
a
65 C to 150 C
Storage Temperature Range
Lead Temperature (Soldering, 4 sec.)
§
§
Supply Voltage, V
CC
7V
7V
7V
260 C
§
Control Input Voltages
Driver Input Voltage
Driver Output Voltages
Recommended Operating
Conditions
a
a
b
15V/ 10V
Min
4.75
Max
5.25
Units
V
Receiver Input Voltages
(DS3695, DS3696)
b
15V/ 10V
Supply Voltage, V
Bus Voltage
CC
b
a
7
12
V
Receiver Common Mode Voltage
(DS3697, DS3698)
g
25V
Operating Free Air Temp. (T )
A
a
a
Commercial
Industrial
0
70
85
C
C
Receiver Output Voltage
5.5V
§
§
b
40
s
s
k
k
5.25V unless otherwise specified (Notes 2 & 3)
a
Electrical Characteristics 0 C
§
T
A
70 C, 4.75V
§
V
CC
Symbol
Parameter
Conditions
Min Typ Max Units
e
0
V
Differential Driver Output
Voltage (Unloaded)
I
OD1
OD2
O
5
V
e
e
V
Differential Driver Output
Voltage (with Load)
(Figure 1)
R
R
50X; (RS-422) (Note 5)
27X; (RS-485)
2
V
V
1.5
DV
Change in Magnitude of Driver
Differential Output Voltage for
Complementary Output States
OD
0.2
3.0
0.2
V
V
V
e
V
Driver Common Mode Output Voltage (Figure 1)
R
27X
OC
D V
Change in Magnitude of Driver
Common Mode Output Voltage
for Complementary Output States
l
OC
l
V
V
V
Input High Voltage
2
V
V
IH
Input Low Voltage
DI, DE,
0.8
IL
e b
IN
b
1.5
Input Clamp Voltage
Input Low Current
Input High Current
Input Current
RE, E, RE/DE
I
18 mA
V
CL
e
b
200
I
I
I
V
V
V
V
0.4V
mA
mA
mA
mA
IL
IL
e
e
2.4V
12V
20
IH
IN
IH
IN
IN
e
RE/DE or DE
a
DO/RI, DO/RI
RI, RI
V
CC
0V or 5.25V
e
1.0
0.8
0V
e b
b
7V
e
CC
e
0V
I
TRI-STATE Current DO, DO
DS3697 & DS3698
V
0V or 5.25V, E
OZD
g
100
mA
k
k
a
b
7V
V
V
12V
O
s
s
a
b
V
Differential Input Threshold
Voltage for Receiver
7V
12V
TH
CM
b
a
0.2
0.2
V
e
DV
Receiver Input Hysteresis
Receiver Output High Voltage
Output Low Voltage RO
TS
V
0V
70
mV
V
TH
CM
e b
V
V
I
I
I
400 mA
2.4
OH
OH
OL
OL
e
e
16 mA (Note 5)
8 mA
0.5
0.45
V
OL
V
e
Max
I
OFF-State (High Impedance)
Output Current at Receiver
V
OZR
CC
g
20
mA
s
s
2.4V
0.4V
V
O
s
s
V
CM
b
a
12V
R
Receiver Input Resistance
Supply Current
7V
12
kX
mA
mA
IN
I
No Load
(Note 5)
Driver Outputs Enabled
Driver Outputs Disabled
42
27
60
40
CC
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2
Electrical Characteristics (Continued)
s
s
k
k
5.25V unless otherwise specified (Notes 2 & 3)
a
0 C
§
T
A
70 C, 4.75V
§
V
CC
Symbol
Parameter
Conditions
Min Typ Max Units
e b
e a
b
a
I
Driver Short-Circuit Output Current
V
O
V
O
V
O
7V (Note 5)
250 mA
250 mA
OSD
12V (Note 5)
e
b
b
85
I
Receiver Short-Circuit Output Current
0V
15
mA
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.
e
e
25 C.
Note 3: All typicals are given for V
5V and T
§
Note 4: Derate linearly at 11.1 mW/ C to 570 mW at 70 C.
CC
A
§
§
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
s
s
a
b
range device ( 40 C
T
85 C).
§
§
A
Switching Characteristics
s
s
k
k
V 5.25V unless otherwise specified (Notes 3, 6)
CC
a
0 C
§
T
A
70 C, 4.75V
§
Receiver Switching Characteristics (Figures 2, 3 and4)
Symbol
Conditions
Min
15
15
0
Typ
25
Max
37
Units
ns
e
15 pF
S1 and S2
Closed
t
t
C
L
PLH
25
37
ns
PHL
t
–t
PLH PHL
ns
l
l
e
e
e
e
t
t
t
t
C
L
C
L
C
L
C
L
15 pF, S2 Open
15 pF, S1 Open
15 pF, S2 Open
15 pF, S1 Open
5
12
12
15
15
16
16
20
20
ns
PLZ
PHZ
PZL
PZH
5
ns
7
ns
7
ns
Driver Switching Characteristics
Symbol
Conditions
Min
Typ
Max
Units
SINGLE ENDED CHARACTERISTICS(Figures 5, 6 and7)
e
t
t
t
t
t
t
t
R
C
60X
e
100 pF
9
9
15
15
2
22
22
8
ns
ns
ns
ns
ns
ns
ns
PLH
PHL
SKEW
PLZ
L
DIFF
e
C
L2
L1
t –t
PLH PHL
l
l
e
C
L
C
L
C
L
C
L
15 pF, S2 Open
15 pF, S1 Open
100 pF, S2 Open
100 pF, S1 Open
7
7
15
15
35
35
30
30
50
50
e
e
e
PHZ
PZL
30
30
PZH
DIFFERENTIAL CHARACTERISTICS (Figures 5 and8 )
e
60X
t , t
r f
R
C
L
DIFF
e
6
10
18
ns
e
100 pF
C
L2
L1
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 V
OD
and V
OC
TL/F/10408–3
FIGURE 2. Receiver Propagation Delay Test Circuit
TL/F/10408–4
a
b
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
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
is the difference between propagation delays of the complementary outputs.
Note: t
and t
are measured to the respective 50% points. t
PHL SKEW
PLH
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
Thermal
Inputs
Outputs
TS*
(DS3696 Only)
Shutdown
DO
RE
DE
DI
DO
X
X
X
X
1
1
0
1
1
0
X
X
OFF
OFF
OFF
ON
0
1
Z
Z
1
0
Z
Z
H
H
H
L
DS3695/DS3696 Receiving
Inputs
Outputs
TS*
(DS3696 Only)
RE
DE
RI–RI
RO
t
a
b
0
0
1
0
0
0
0.2V
0.2V
1
0
Z
H
H
H
s
X
DS3697/DS3698
Inputs
RI-RI
Outputs
RO
Thermal
TS*
(DS3698 Only)
Shutdown
E
DO
DO
(DS3697 Only)
t
s
a
b
1
1
0
1
1
0.2V
0.2V
OFF
OFF
OFF
ON
0
1
Z
Z
Z
1
0
Z
Z
Z
1
0
Z
1
0
H
H
H
L
X
t
s
a
b
0.2V
0.2V
ON
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 V
I
vs
vs Temperature
Driver V vs
OL
OH
Driver V
OH
vs I
OH
vs V
CC
I
vs Temperature
OL
OH
ation
TL/H/10408–16
7
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Typical Performance Characteristics (Continued)
Supply Current vs
Temperature
Supply Current vs Power
Supply Voltage
Driver I vs Switching
CC
Frequency
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
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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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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