TI UA9638CP

uA9638C
DUAL HIGH-SPEED DIFFERENTIAL LINE DRIVER
SLLS112C – OCTOBER 1980 – REVISED APRIL 1994
D
D
D
D
D
D
D OR P PACKAGE
(TOP VIEW)
Meets or Exceeds ANSI Standard
EIA/ TIA-422-B
Operates From a Single 5-V Power Supply
Drives Loads as Low as 50 Ω up
to 15 Mbps
TTL- and CMOS-Input Compatibility
Output Short-Circuit Protection
Interchangeable With National
Semiconductor DS9638
VCC
1A
2A
GND
1
8
2
7
3
6
4
5
1Y
1Z
2Y
2Z
description
The uA9638C is a dual high-speed differential line driver designed to meet ANSI Standard EIA / TIA-422-B. The
inputs are TTL and CMOS compatible and have input clamp diodes. Schottky-diode-clamped transistors are
used to minimize propagation delay time. This device operates from a single 5-V power supply and is supplied
in an 8-pin package.
The uA9638 provides the current needed to drive low-impedance loads at high speeds. Typically used with
twisted-pair cabling and differential receiver(s), base-band data transmission can be accomplished up to and
exceeding 15 Mbps in properly designed systems. The uA9637A dual line receiver is commonly used as the
receiver. For even faster switching speeds in the same pin configuration, see the SN75ALS191.
The uA9638C is characterized for operation from 0°C to 70°C.
logic symbol†
1A
2A
2
3
logic diagram
8
7
6
5
1A
1Y
1Z
2A
2Y
2
3
8
7
6
5
1Y
1Z
2Y
2Z
2Z
† This symbol is in accordance with ANSI/IEEE Std 91-1984 and
IEC Publication 617-12.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
National Semiconductor is a trademark of National Semiconductor Corporation.
Copyright  1994, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
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• DALLAS, TEXAS 75265
1
uA9638C
DUAL HIGH-SPEED DIFFERENTIAL LINE DRIVER
SLLS112C – OCTOBER 1980 – REVISED APRIL 1994
schematics of inputs and outputs
EQUIVALENT OF EACH INPUT
TYPICAL OF ALL OUTPUTS
VCC
VCC
4 kΩ NOM
Input
9.6 Ω NOM
Output
GND
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)†
Supply voltage range, VCC (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.5 V to 7 V
Input voltage range, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.5 V to 7 V
Continuous total power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Dissipation Rating Table
Operating free-air temperature range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 65°C to 150°C
Lead temperature 1,6 mm (1/16 inch) from 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°C
† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTE 1: Voltage values except differential output voltages are with respect to network GND.
DISSIPATION RATING TABLE
TA = 25°C
POWER RATING
DERATING FACTOR
ABOVE TA = 25°C
TA = 70°C
POWER RATING
D
725 mW
5.8 mW/°C
464 mW
P
1000 mW
8.0 mW/°C
640 mW
PACKAGE
recommended operating conditions
Supply voltage, VCC
High-level input voltage, VIH
MIN
NOM
MAX
UNIT
4.75
5
5.25
V
2
Low-level input voltage, VIL
High-level output current, IOH
Low-level output current, IOL
Operating free-air temperature, TA
2
0
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• DALLAS, TEXAS 75265
V
0.8
V
– 50
mA
50
mA
70
°C
uA9638C
DUAL HIGH-SPEED DIFFERENTIAL LINE DRIVER
SLLS112C – OCTOBER 1980 – REVISED APRIL 1994
electrical characteristics over operating free-air temperature range (unless otherwise noted)
PARAMETER
TEST CONDITIONS
VIK
Input clamp voltage
VCC = 4.75 V,
II = – 18 mA
VOH
High level output voltage
High-level
VCC = 4.75 V,,
VIL = 0.8 V
VIH = 2 V,,
VOL
Low level output voltage
Low-level
VCC = 4.75 V,,
IOL = 40 mA
VIH = 2 V,,
|VOD1|
Magnitude of differential output voltage
VCC = 5.25 V,
IO = 0
|VOD2|
Magnitude of differential output voltage
∆|VOD|
Change in magnitude of differential
output voltage‡
VOC
Common-mode output voltage§
∆|VOC|
Change in magnitude of common-mode
common mode
output voltage‡
IO
Output current with power off
IOH = – 10 mA
IOH = – 40 mA
MIN
2.5
TYP†
MAX
UNIT
–1
– 1.2
V
3.5
V
2
VIL = 0.8 V,,
05
0.5
V
2VOD2
V
2
VCC = 4.75 V to 5.25 V,,
See Figure 1
RL = 100 Ω,,
VO = 6 V
VO = – 0.25 V
VCC = 0
V
Input current
High-level input current
VCC = 5.25 V,
VCC = 5.25 V,
IIL
Low-level input current
VCC = 5.25 V,
VI = 2.7 V
VI = 0.5 V
IOS
Short-circuit output current¶
VCC = 5.25 V,
VO = 0
V
3
V
04
± 0.4
V
0.1
100
– 0.1
– 100
µA
± 100
VO = – 0.25 V to 6 V
VI = 5.5 V
II
IIH
± 0.4
04
– 50
50
µA
25
µA
– 200
µA
– 150
mA
ICC
Supply current (both drivers)
VCC = 5.25 V, No load,
All inputs at 0 V
45
65
mA
† All typical values are at VCC = 5 V and TA = 25°C.
‡ ∆ | VOD | and ∆ | VOC | are the changes in magnitude of VOD and VOC, respectively, that occur when the input is changed from a high level to a
low level or vice versa.
§ In Standard EIA-422-A, VOC, which is the average of the two output voltages with respect to ground, is called output offset voltage, VOS.
¶ Only one output at a time should be shorted, and duration of the short circuit should not exceed one second.
switching characteristics, VCC = 5 V, TA = 25°C
PARAMETER
td(OD)
tt(OD)
Differential output delay time
tsk(o)
Output skew
Differential output transition time
TEST CONDITIONS
CL = 15 pF,
pF
RL = 100 Ω
Ω,
See Figure 2
See Figure 2
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• DALLAS, TEXAS 75265
MIN
TYP
MAX
10
20
ns
10
20
ns
1
UNIT
ns
3
uA9638C
DUAL HIGH-SPEED DIFFERENTIAL LINE DRIVER
SLLS112C – OCTOBER 1980 – REVISED APRIL 1994
PARAMETER MEASUREMENT INFORMATION
50 Ω
VOD2
Input
VOC
50 Ω
Figure 1. Differential and Common-Mode Output Voltages
3V
Input
1.5 V
1.5 V
0V
Y Output
Differential
Output
CL
Generator
(see Note A)
td(OD)
RL = 100 Ω
50 Ω
td(OD)
90%
90%
10%
10%
tt(OD)
tt(OD)
Z Output
CL = 15 pF
(see Note B)
VOH
Y Output
50%
50%
tsk(o)
tsk(o)
VOL
VOH
50%
Z Output
50%
VOL
TEST CIRCUIT
VOLTAGE WAVEFORMS
NOTES: A. The input pulse generator has the following characteristics: ZO = 50 Ω, PRR ≤ 500 kHz, tw = 100 ns, tr = ≤ 5 ns.
B. CL includes probe and jig capacitance.
Figure 2. Test Circuit and Voltage Waveforms
4
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