DS96172CN [NSC]
RS-485/RS-422 Quad Differential Line Drivers; RS - 485 / RS - 422四路差分线路驱动器
| 型号： | DS96172CN |
| 厂家： | 
National Semiconductor |
| 描述： | RS-485/RS-422 Quad Differential Line Drivers |
| 文件： | 总6页 (文件大小：213K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
June 1998
DS96172/DS96174
RS-485/RS-422 Quad Differential Line Drivers
General Description
Features
n Meets EIA Standard RS-485 and RS-422A
n Monotonic differential output switching
n Transmission rate to 10 Mbs
n TRI-STATE outputs
The DS96172 and DS96174 are high speed quad differential
line drivers designed to meet EIA Standard RS-485. The de-
vices have TRI-STATE® outputs and are optimized for bal-
anced multipoint data bus transmission at rates up to
10 Mbps. The drivers have wide positive and negative com-
mon mode range for multipoint applications in noisy environ-
ments. Positive and negative current-limiting is provided
which protects the drivers from line fault conditions over a
+12V to −7.0V common mode range. A thermal shutdown
feature is also provided and occurs at junction temperature
of approximately 160˚C. The DS96172 features an active
high and active low Enable, common to all four drivers. The
DS96174 features separate active high Enables for each
driver pair. Compatible RS-485 receivers, transceivers, and
repeaters are also offered to provide optimum bus perfor-
mance. The respective device types are DS96173,
DS96175, DS96176 AND DS96177.
n Designed for multipoint bus transmission
n Common mode output voltage range: −7V to +12V
n Operates from single +5V supply
n Thermal shutdown protection
n DS96172/DS96174 are lead and function compatible
with the SN75172/75174 or the AM26LS31/MC3487
respectively
Connection Diagrams
16-Lead DIP
DS96172
16-Lead DIP
DS96174
DS009626-1
DS009626-2
Top View
Top View
Order Number DS96172CN or DS96174CN
See NS Package Number N16E
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
© 1998 National Semiconductor Corporation
DS009626
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Absolute Maximum Ratings (Note 2)
N-Molded Package
1.98W
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Recommended Operating
Conditions
Storage Temperature Range
Min
Typ
Max
Units
Molded DIP
−65˚C to +150˚C
0˚C to +70˚C
Supply Voltage (VCC
Common Mode Output
Voltage (VOC
Output Current HIGH (IOH
Output Current LOW (IOL
Operating Temperature (TA)
)
4.75
5
5.25
V
Operating Temperature Range
Lead Temperature
)
−7
+12
−60
60
V
Molded DIP (soldering, 10
sec.)
)
mA
mA
˚C
265˚C
7V
)
Supply Voltage
0
25
70
Enable Input Voltage
5.5V
Note 1: Derate molded DIP package 16mW/˚C above 25˚C.
Maximum Power Dissipation
(Note 1)
25˚C
Electrical Characteristics (Notes 3, 4)
over recommended temperature and supply voltage ranges, unless otherwise specified
Symbol
VIH
Parameter
Input Voltage HIGH
Conditions
Min
Typ
Max
Units
V
2
VIL
Input Voltage LOW
0.8
V
VOH
VOL
Output Voltage HIGH
Output Voltage LOW
Input Clamp Voltage
Differential Output Voltage
Differential Output Voltage
IOH = −20 mA
3.1
0.8
V
IOL = 20 mA
V
VIC
II = −18 mA
−1.5
6
V
|VOD1
|
|
IO = 0 mA
V
|VOD2
RL = 54Ω, Figure 1
RL = 100Ω, Figure 1
RL = 54Ω or 100Ω, Figure 1
1.5
2
2
V
2.3
V
±
±
∆|VOD
|
Change in Magnitude of Differential
Output Voltage (Note 5)
0.2
V
VOC
Common Mode Output Voltage (Note 6)
Change in Magnitude of Common Mode
Output Voltage (Note 5)
RL = 54Ω, Figure 1
3
V
V
∆|VOC
|
0.2
±
±
IO
Output Current with Power Off
High Impedance State Output Current
Input Current HIGH
VCC = 0V, VO = −7.0V to 12V
VO = −7.0V to 12V
VI = 2.7V
100
200
20
µA
µA
µA
µA
±
IOZ
IIH
IIL
50
Input Current LOW
VI = 0.5V
−100
−250
−150
150
250
70
IOS
Short Circuit Output Current
(Note 7)
VO = −7.0V
VO = 0V
mA
mA
VO = VCC
VO = 12V
ICC
Supply Current (All Drivers)
No Load
Outputs Enabled
Output Disabled
50
50
60
Switching Characteristics
VCC = 5V, TA = 25˚C
Symbol
tDD
Parameter
Differential Output Delay Time
Differential Output Transition Time
Propagation Delay Time,
Conditions
Min
Typ
15
Max
Units
ns
RL = 60Ω, Figure 2
25
25
20
tTD
15
ns
tPLH
RL = 27Ω, Figure 3
12
ns
Low-to-High Level Output
tPHL
Propagation Delay Time,
12
20
ns
High-to-Low Level Output
tPZH
tPZL
Output Enable Time to High Level
Output Enable Time to Low Level
RL = 110Ω, Figure 4
RL = 110Ω, Figure 5
30
30
45
45
ns
ns
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2
Switching Characteristics (Continued)
VCC = 5V, TA = 25˚C
Symbol
tPHZ
tPLZ
Parameter
Conditions
RL = 110Ω, Figure 4
RL = 110Ω, Figure 5
Min
Typ
25
Max
35
Units
ns
Output Disable Time from High Level
Output Disable Time from Low Level
30
45
ns
Note 2: “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the devices
should be operated at these limits. The tables of “Electrical Characteristics” provide conditions for actual device operation.
Note 3: Unless otherwise specified min/max limits apply across the 0˚C to +70˚C range for the DS96172/DS96174. All typicals are given for V = 5V and T = 25˚C.
CC
A
Note 4: All currents into the device pins are positive; all currents out of the device pins are negative. All voltages are referenced to ground unless otherwise specified.
Note 5: ∆ |V | and ∆|V | are the changes in magnitude of V and V respectively, that occur when the input is changed from a high level to a low level.
OD OC OD OC
Note 6: In EIA Standards RS-422A and RS-485, V which is the average of the two output voltages with respect to ground, is called output offset voltage, V
.
OS
OC,
Note 7: Only one output at a time should be shorted.
Parameter Measurement Information
DS009626-4
FIGURE 1. Differential and Common Mode Output Voltage
DS009626-5
DS009626-6
FIGURE 2. Differential Output Delay and Transition Times
DS009626-7
DS009626-8
FIGURE 3. Propagation Delay Times
3
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Parameter Measurement Information (Continued)
DS009626-10
DS009626-9
FIGURE 4. tPZH and tPHZ
DS009626-12
DS009626-11
FIGURE 5. tPZL and tPLZ
Note 8: The input pulse is supplied by a generator having the following characteristics: PRR = 1.0 MHz, duty cycle = 50%, t ≤ 5.0 ns, t ≤ 5.0 ns, Z = 50Ω.
r
f
O
Note 9:
C includes probe and jig capacitance.
L
Note 10: DS96172 with active high and active low Enables is shown here. DS96174 has active high Enable only.
Note 11: To test the active low Enable E of DS96172, ground E and apply an inverted waveform to E . DS96174 has active high Enable only.
Function Tables
DS96172
DS96174
Input
Input
Enables
Outputs
Enable
Outputs
A
H
L
E
H
H
X
X
L
E
X
X
L
Y
H
L
Z
L
Y
H
L
Z
L
H
L
H
H
L
H
L
H
Z
H
L
H
L
X
Z
L
H
Z
H = High Level
X = Immaterial
L = Low Level
X
H
Z
Z = High Impedance (off)
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4
Typical Application
DS009626-13
Note: The line length should be terminated at both ends in its characteristic impedance.
Stub lengths off the main line should be kept as short as possible.
FIGURE 6.
5
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Physical Dimensions inches (millimeters) unless otherwise noted
Molded Dual-In-Line Package (N)
Order Number DS96172CN or DS96174CN
NS Package Number N16E
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to the user.
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