uA9638C
DUAL HIGH-SPEED DIFFERENTIAL LINE DRIVER
SLLS112C − OCTOBER 1980 − REVISED APRIL 1994
D Meets or Exceeds ANSI Standard
D
D
D
D
D
D OR P PACKAGE
(TOP VIEW)
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.
POST OFFICE BOX 655303
• 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
25°C
TA = 25
C
POWER RATING
DERATING FACTOR
ABOVE TA = 25°C
70°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
V
Low-level input voltage, VIL
0.8
V
High-level output current, IOH
−50
mA
Low-level output current, IOL
50
mA
70
°C
Operating free-air temperature, TA
2
0
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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
VIK
MIN
TYP†
MAX
UNIT
−1
−1.2
V
IOH = − 10 mA
2.5
3.5
IOH = − 40 mA
2
TEST CONDITIONS
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
Δ|VOD|
Change in magnitude of differential
output voltage‡
VOC
Common-mode output voltage§
Δ|VOC|
Change in magnitude of common-mode
output voltage‡
VIL = 0.8 V,
Output current with power off
05
0.5
V
2VOD2
V
2
VCC = 4.75 V to 5.25 V,
See Figure 1
VO = − 0.25 V
VCC = 0
V
RL = 100 Ω,
VO = 6 V
IO
V
± 0.4
04
V
3
V
04
± 0.4
V
0.1
100
−0.1
−100
μA
± 100
VO = − 0.25 V to 6 V
II
Input current
VCC = 5.25 V,
VI = 5.5 V
50
μA
IIH
High-level input current
VCC = 5.25 V,
VI = 2.7 V
25
μA
IIL
Low-level input current
VCC = 5.25 V,
VI = 0.5 V
−200
μA
VCC = 5.25 V,
VO = 0
−150
mA
VCC = 5.25 V,
No load,
65
mA
current¶
IOS
Short-circuit output
ICC
Supply current (both drivers)
−50
All inputs at 0 V
45
†
All typical values are at VCC = 5 V and TA = 25°C.
Δ | VOD | and Δ | 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, V , which is the average of the two output voltages with respect to ground, is called output offset voltage, V .
OC
OS
¶ 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)
Differential output delay time
tt(OD)
Differential output transition time
tsk(o)
Output skew
TEST CONDITIONS
CL = 15 pF,
pF
RL = 100 Ω,
Ω
See Figure 2
See Figure 2
POST OFFICE BOX 655303
• 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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PACKAGE OPTION ADDENDUM
www.ti.com
14-Aug-2021
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
(2)
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
(4/5)
(6)
UA9638CD
ACTIVE
SOIC
D
8
75
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
0 to 70
9638C
UA9638CDE4
ACTIVE
SOIC
D
8
75
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
0 to 70
9638C
UA9638CDR
ACTIVE
SOIC
D
8
2500
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
0 to 70
9638C
UA9638CDRG4
ACTIVE
SOIC
D
8
2500
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
0 to 70
9638C
UA9638CP
ACTIVE
PDIP
P
8
50
RoHS & Green
NIPDAU
N / A for Pkg Type
0 to 70
UA9638CP
UA9638CPE4
ACTIVE
PDIP
P
8
50
RoHS & Green
NIPDAU
N / A for Pkg Type
0 to 70
UA9638CP
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of