DS8921AN/NOPB [TI]
LINE TRANSCEIVER, PDIP8, PLASTIC, DIP-8;
| 型号： | DS8921AN/NOPB |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | LINE TRANSCEIVER, PDIP8, PLASTIC, DIP-8 驱动 光电二极管 接口集成电路 驱动器 |
| 文件： | 总8页 (文件大小：685K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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May 1998
DS8921/DS8921A/DS8921AT
Differential Line Driver and Receiver Pair
The DS8921, DS8921A are designed to be compatible with
TTL and CMOS.
General Description
The DS8921, DS8921A are Differential Line Driver and Re-
ceiver pairs designed specifically for applications meeting
the ST506, ST412 and ESDI Disk Drive Standards. In addi-
tion, these devices meet the requirements of the EIA Stan-
dard RS-422.
Features
n 12 ns typical propagation delay
n Output skew - 0.5 ns typical
n Meet the requirements of EIA Standard RS-422
n Complementary Driver Outputs
n High differential or common-mode input voltage ranges
of 7V
The DS8921, DS8921A receivers offer an input sensitivity of
200 mV over a 7V common mode operating range. Hys-
teresis is incorporated (typically 70 mV) to improve noise
margin for slowly changing input waveforms.
n
0.2V receiver sensitivity over the input voltage range
The DS8921, DS8921A drivers are designed to provide uni-
polar differential drive to twisted pair or parallel wire trans-
mission lines. Complementary outputs are logically ANDed
and provide an output skew of 0.5 ns (typ.) with propagation
delays of 12 ns.
n Receiver input hysteresis-70 mV typical
n DS8921AT industrial temperature
operation: (−40˚C to +85˚C)
Connection Diagram
00851201
Order Number DS8921M, DS8921N, DS8921AM, DS8921AN,
DS8921ATM, or DS8921ATN
See NS Package Number M08A or N08E
Truth Table
Receiver
Input
Driver
VOUT
Input
VOUT
VOUT
VID ≥ VTH (MAX)
VID ≤ VTH (MIN)
Open
1
0
1
1
0
1
0
0
1
© 2004 National Semiconductor Corporation
DS008512
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Absolute Maximum Ratings (Note 1)
Storage Temperature
Range
−65˚C to +165˚C
+260˚C
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Lead Temperature
(Soldering, 4 sec.)
Maximum Junction
Temperature
+260˚C
Supply Voltage
7V
−0.5V to +7V
5.5V
Driver Input Voltage
Output Voltage
+150˚C
Receiver Output Sink
Current
Recommended Operating
Conditions
50 mA
10V
Receiver Input Voltage
Differential Input Voltage
Min
Max
Units
12V
Supply Voltage
Temperature (TA)
DS8921/DS8921A
DS8921AT
4.5
5.5
V
@
Maximum Package Power Dissipation +25˚C
M Package
N Package
730 mW
0
70
˚C
˚C
1160 mW
9.3 mW/˚C above
+25˚C
−40
+85
Derate M Package
Derate N Package
5.8 mW/˚C above
+25˚C
DS8921/DS8921A Electrical Characteristics (Notes 2, 3, 4)
Symbol
Conditions
Min
Typ
Max
Units
RECEIVER
VTH
−7V ≤ VCM ≤ +7V
−200
15
35
70
+200
mV
mV
kΩ
VHYST
RIN
−7V ≤ VCM ≤ +7V
VIN = −7V, +7V
(Other Input = GND)
VIN = 10V
4.0
6.0
IIN
3.25
mA
mA
V
VIN = −10V
−3.25
VOH
IOH = −400 µA
IOL = 8 mA
2.5
−15
2.0
VOL
0.5
V
ISC
VCC = MAX, VOUT = 0V
−100
mA
DRIVER
VIH
V
V
VIL
0.8
−200
20
IIL
VCC = MAX, VIN = 0.4V
VCC = MAX, VIN = 2.7V
VCC = MAX, VIN = 7.0V
VCC = MIN, IIN = −18 mA
VCC = MIN, IOH = −20 mA
VCC = MIN, IOL = +20 mA
−40
µA
µA
µA
V
IIH
II
100
−1.5
VCL
VOH
2.5
V
VOL
0.5
100
0.4
V
IOFF
VCC = 0V, V
= 5.5V
µA
V
OUT
|VT| – |VT |
VT
2.0
V
|VOS – VOS
ISC
|
0.4
V
VCC = MAX, VOUT = 0V
−30
−150
mA
DRIVER and RECEIVER
ICC
VCC = MAX, VOUT = Logic 0
35
mA
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2
Receiver Switching Characteristics
Figure 1(Figure 2)
Symbol
Conditions
Min
Typ
14
Max
8921A
20
Units
ns
8921
8921AT
TpLH
TpHL
|TpLH–T pHL
CL = 30 pF
22.5
20
(Figures 1, 2 )
CL = 30 pF
14
22.5
5
20
20
5
ns
(Figures 1, 2)
CL = 30 pF
|
0.5
3.5
ns
(Figures 1, 2 )
Driver Switching Characteristics
SINGLE ENDED CHARACTERISTICS (Figures 3, 4)
Symbol
Conditions
Min
Typ
Max
8921A
15
Units
ns
8921
8921AT
TpLH
CL = 30 pF
10
10
5
15
15
8
15
(Figures 3, 4)
CL = 30 pF
TpHL
TTLH
TTHL
Skew
15
8
15
9.5
9.5
3.5
ns
(Figures 3, 4)
CL = 30 pF
ns
(Figures 7, 8)
CL = 30 pF
5
8
8
ns
(Figures 7, 8)
CL = 30 pF
(Figures 3, 4)
1
5
3.5
ns
Driver Switching Characteristics(Note 6)
DIFFERENTIAL CHARACTERISTICS (Figures 3, 5)
Symbol
Conditions
Min
Typ
10
Max
8921A
15
Units
ns
8921
8921AT
TpLH
TpHL
|TpLH–T pHL
CL = 30 pF
15
15
(Figures 3, 5, 6)
CL = 30 pF
10
15
6
15
15
ns
(Figures 3, 5, 6)
CL = 30 pF
|
0.5
2.75
2.75
ns
(Figures 3, 5, 6)
Note 1: “Absolute Maximum Ratings” are those values 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 Table of “Electrical Characteristics” provides conditions for actual device operation.
Note 2: All currents into device pins are shown as positive values; all currents out of the device are shown as negative; all voltages are referenced to ground unless
otherwise specified. All values shown as max or min are classified on absolute value basis.
Note 3: All typical values are V
= 5V, T = 25˚C.
A
CC
Note 4: Only one output at a time should be shorted.
Note 5: Difference between complementary outputs at the 50% point.
Note 6: Differential Delays are defined as calculated results from single ended rise and fall time measurements. This approach in establishing AC performance
specifications has been taken due to limitations of available Automatic Test Equipment (ATE).
The calculated ATE results assume a linear transition between measurement points and are a result of the following equations:
Where: T = Crossing Point
cr
T
, T , T and T are time measurements with respect to the input. See Figure 6 .
fb
ra rb fa
3
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AC Test Circuits and Switching Diagrams
00851207
FIGURE 5.
00851203
FIGURE 1.
00851202
FIGURE 6.
FIGURE 7.
FIGURE 8.
00851204
FIGURE 2.
00851210
00851205
FIGURE 3.
00851211
00851206
FIGURE 4.
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4
Typical Applications
ST506 and ST412 Application
00851208
ESDI Application
00851209
5
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Physical Dimensions inches (millimeters)
unless otherwise noted
SO Package (M)
Order Number DS8921M, DS8921AM or DS8921ATM
NS Package Number M08A
Molded Dual-In-Line Package (N)
Order Number DS8921N, DS8921AN or DS8921ATN
NS Package Number N08E
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6
Notes
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.
For the most current product information visit us at www.national.com.
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