QUADRUPLE 2-LINE TO 1-LINE DATA SELECTOR/MULTIPLEXER
Description
74AC11257
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTOR/MULTIPLEXER
WITH 3-STATE 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 VCC 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 1Y 2Y GND GND GND GND 3Y 4Y OE
1 2 3 4 5 6 7 8 9 10
20 1A 19 1B 18 2A 17 2B 16 VCC 15 VCC 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 VCC 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 AB
OUTPUT Y
H X XX Z
L L LX L
L L HX H
L H XL L
L H XH H
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.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments standard warranty.
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