74AC11257 Datasheet, PDF (1/12 Pages) Texas Instruments – QUADRUPLE 2-LINE TO 1-LINE DATA SELECTOR/MULTIPLEXER WITH 3-STATE OUTPUTS

74AC11257
QUADRUPLE 2ĆLINE TO 1ĆLINE DATA SELECTOR/MULTIPLEXER
WITH 3ĆSTATE OUTPUTS
SCAS049C − MARCH 1989 − REVISED MAY 2004
D 3-State Outputs Interface Directly With
System Bus
D Flow-Through Architecture Optimizes
PCB Layout
D Center-Pin V_CC and GND Configurations
Minimize High-Speed Switching Noise
D 500-mA Typical Latch-Up Immunity at
125°C
D Provides Bus Interface From Multiple
Sources in High-Performance Systems
description/ordering information
DB, DW, N, OR PW PACKAGE
(TOP VIEW)
A/B ₁
1Y 2
2Y 3
GND 4
GND 5
GND 6
GND 7
3Y 8
4Y 9
OE 10
20 ^1A
19 1B
18 2A
17 2B
16 V_CC
15 V_CC
14 3A
13 3B
12 4A
11 4B
This device is designed to multiplex signals from 4-bit data sources to four output data lines in bus-organized
systems. The 3-state outputs do not load the data lines when the output-enable (OE) input is at a high logic level.
To ensure the high-impedance state during power up or power down, OE should be tied to V_CC through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
ORDERING INFORMATION
TA
PACKAGE†
ORDERABLE
PART NUMBER
TOP-SIDE MARKING
PDIP − N
Tube
74AC11257N
74AC11257N
−40°C to 85°C
SOIC − DW
SSOP − DB
Tube
Tape and reel
Tape and reel
74AC11257DW
74AC11257DWR
74AC11257DBR
AC11257
AE257
TSSOP − PW
Tube
Tape and reel
74AC11257PW
74AC11257PWR
AE257
† _{Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are}
available at www.ti.com/sc/package.
FUNCTION TABLE
INPUTS
SELECT
OE
A/B
DATA
A
B
OUTPUT
Y
H
X
X
X
Z
L
L
L
X
L
L
L
H
X
H
L
H
X
L
L
L
H
X
H
H
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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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Copyright  2004, Texas Instruments Incorporated
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