uA9638C
DUAL HIGH-SPEED DIFFERENTIAL LINE DRIVER
SLLS112C − OCTOBER 1980 − REVISED APRIL 1994
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
DMeets or Exceeds ANSI Standard
EIA/TIA-422-B
DOperates From a Single 5-V Power Supply
DDrives Loads as Low as 50 Ω up
to 15 Mbps
DTTL- and CMOS-Input Compatibility
DOutput Short-Circuit Protection
DInterchangeable With National
Semiconductor™ DS9638
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†
†This symbol is in accordance with ANSI/IEEE Std 91-1984 and
IEC Publication 617-12.
2A
1A
5
6
7
8
2Z
2Y
1Z
1Y
3
2
logic diagram
2Z
2Y
1Z
1Y
3
2
2A
1A
5
6
7
8
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.
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.
1
2
3
4
8
7
6
5
VCC
1A
2A
GND
1Y
1Z
2Y
2Z
D OR P PACKAGE
(TOP VIEW)
uA9638C
DUAL HIGH-SPEED DIFFERENTIAL LINE DRIVER
SLLS112C − OCTOBER 1980 − REVISED APRIL 1994
2POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
schematics of inputs and outputs
VCC
EQUIVALENT OF EACH INPUT TYPICAL OF ALL OUTPUTS
Input
4 kΩ NOM
VCC
Output
GND
9.6 Ω NOM
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
PACKAGE
TA = 25°CDERATING FACTOR TA = 70°C
PACKAGE
TA
=
25 C
POWER RATING
DERATING
FACTOR
ABOVE TA = 25°C
TA
=
70 C
POWER RATING
D725 mW 5.8 mW/°C464 mW
P1000 mW 8.0 mW/°C640 mW
recommended operating conditions
MIN NOM MAX UNIT
Supply voltage, VCC 4.75 5 5.25 V
High-level input voltage, VIH 2 V
Low-level input voltage, VIL 0.8 V
High-level output current, IOH −50 mA
Low-level output current, IOL 50 mA
Operating free-air temperature, TA0 70 °C
uA9638C
DUAL HIGH-SPEED DIFFERENTIAL LINE DRIVER
SLLS112C − OCTOBER 1980 − REVISED APRIL 1994
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
electrical characteristics over operating free-air temperature range (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP†MAX UNIT
VIK Input clamp voltage VCC = 4.75 V, II = −18 mA −1 −1.2 V
V
High level output voltage
V
CC
= 4.75 V, VIH = 2 V, IOH = −10 mA 2.5 3.5
V
VOH High-level output voltage
VCC
=
4
.
75
V
,
VIL = 0.8 V
VIH
=
2
V
,
IOH = −40 mA 2V
V
Low level output voltage
V
CC
= 4.75 V, VIH = 2 V, VIL = 0.8 V,
V
VOL Low-level output voltage
VCC
=
4
.
75
V
,
IOL = 40 mA
VIH
=
2
V
,
VIL
=
0
.
8
V
, 0.5 V
|VOD1|Magnitude of differential output voltage VCC = 5.25 V, IO = 0 2VOD2 V
|VOD2|Magnitude of differential output voltage 2 V
Δ|V |
Chan
g
e in ma
g
nitude of differential
V
Δ|VOD|
Change
in
magnitude
of
differential
output voltage‡V
CC
= 4.75 V to 5.25 V, RL = 100 Ω, ±0.4 V
VOC Common-mode output voltage§
VCC
=
4
.
75
V
to
5
.
25
V
,
See Figure 1
RL
=
100
Ω
,
3 V
Δ|V |
Chan
g
e in ma
g
nitude of common-mode
V
Δ|VOC|
Change
in
magnitude
of
common-mode
output voltage‡±0.4 V
VO = 6 V 0.1 100
IOOutput current with power off VCC = 0 VO = − 0.25 V −0.1 −100 μA
IO
Output
current
with
power
off
VCC
0
VO = − 0.25 V to 6 V ±100
μA
IIInput 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
IOS Short-circuit output currentVCC = 5.25 V, VO = 0 −50 −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.
‡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, 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 TEST CONDITIONS MIN TYP MAX UNIT
td(OD) Differential output delay time
C15 pF
R100 Ω
See Figure 2
10 20 ns
tt(OD) Differential output transition time CL = 15 pF, RL = 100 Ω, See Figure 2 10 20 ns
tsk(o) Output skew See Figure 2 1 ns
uA9638C
DUAL HIGH-SPEED DIFFERENTIAL LINE DRIVER
SLLS112C − OCTOBER 1980 − REVISED APRIL 1994
4POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
PARAMETER MEASUREMENT INFORMATION
50 ΩVOC
50 Ω
Input VOD2
Figure 1. Differential and Common-Mode Output Voltages
Differential
Output
td(OD)
TEST CIRCUIT
Z Output
CL = 15 pF
(see Note B)
50 Ω
VOLTAGE WAVEFORMS
Input 1.5 V
3 V
tt(OD)
0 V
td(OD)
10% 10%
90% 90%
Y Output
RL = 100 Ω
CL
1.5 V
tt(OD)
VOL
50%
VOL
50%
tsk(o) tsk(o)
Y Output
Z Output
VOH
VOH
Generator
(see Note A)
50% 50%
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
PACKAGE OPTION ADDENDUM
www.ti.com 12-Dec-2011
Addendum-Page 1
PACKAGING INFORMATION
Orderable Device Status (1) Package Type Package
Drawing Pins Package Qty Eco Plan (2) Lead/
Ball Finish MSL Peak Temp (3) Samples
(Requires Login)
UA9638CD ACTIVE SOIC D 8 75 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR Add to cart
UA9638CDE4 ACTIVE SOIC D 8 75 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR Add to cart
UA9638CDG4 ACTIVE SOIC D 8 75 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR Add to cart
UA9638CDR ACTIVE SOIC D 8 2500 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR Add to cart
UA9638CDRE4 ACTIVE SOIC D 8 2500 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR Add to cart
UA9638CDRG4 ACTIVE SOIC D 8 2500 Green (RoHS
& no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR Add to cart
UA9638CP ACTIVE PDIP P 8 50 Pb-Free (RoHS) CU NIPDAU N / A for Pkg Type Add to cart
UA9638CPE4 ACTIVE PDIP P 8 50 Pb-Free (RoHS) CU NIPDAU N / A for Pkg Type Add to cart
(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) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability
information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that
lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between
the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight
in homogeneous material)
(3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
PACKAGE OPTION ADDENDUM
www.ti.com 12-Dec-2011
Addendum-Page 2
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
OTHER QUALIFIED VERSIONS OF UA9638 :
•Enhanced Product: UA9638-EP
NOTE: Qualified Version Definitions:
•Enhanced Product - Supports Defense, Aerospace and Medical Applications
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device Package
Type Package
Drawing Pins SPQ Reel
Diameter
(mm)
Reel
Width
W1 (mm)
A0 (mm) B0 (mm) K0 (mm) P1
(mm) W
(mm) Pin1
Quadrant
UA9638CDR SOIC D 8 2500 330.0 12.4 6.4 5.2 2.1 8.0 12.0 Q1
PACKAGE MATERIALS INFORMATION
www.ti.com 19-Mar-2008
Pack Materials-Page 1
*All dimensions are nominal
Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)
UA9638CDR SOIC D 8 2500 340.5 338.1 20.6
PACKAGE MATERIALS INFORMATION
www.ti.com 19-Mar-2008
Pack Materials-Page 2
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