SN54AHC257 Datasheet, PDF (1/9 Pages) Texas Instruments – QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS

SN54AHC257, SN74AHC257
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS
WITH 3-STATE OUTPUTS
SCLS349C – MAY 1996 – REVISED JULY 1998
D Operating Range 2-V to 5.5-V V_CC
D EPIC™ (Enhanced-Performance Implanted
CMOS) Process
D Package Options Include Plastic
Small-Outline (D), Shrink Small-Outline
(DB), Thin Very Small-Outline (DGV), Thin
Shrink Small-Outline (PW), and Ceramic
Flat (W) Packages, Ceramic Chip Carriers
(FK), and Standard Plastic (N) and Ceramic
(J) DIPs
description
SN54AHC257 . . . J OR W PACKAGE
SN74AHC257 . . . D, DB, DGV, N, OR PW PACKAGE
(TOP VIEW)
A/B ₁
1A 2
1B 3
1Y 4
2A 5
2B 6
2Y 7
GND 8
16 ^V_CC
15 OE
14 4A
13 4B
12 4Y
11 3A
10 3B
9 3Y
These quadruple 2-line to 1-line data
selectors/multiplexers are designed for 2-V to
5.5-V V_CC operation.
The ’AHC257 devices are designed to multiplex
signals from 4-bit data sources to 4-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.
The SN54AHC257 is characterized for operation
over the full military temperature range of –55°C
to 125°C. The SN74AHC257 is characterized for
operation from –40°C to 85°C.
SN54AHC257 . . . FK PACKAGE
(TOP VIEW)
3 2 1 20 19
1B 4
18 4A
1Y 5
17 4B
NC 6
16 NC
2A 7
15 4Y
2B ⁸
14 _3A
9 10 11 12 13
NC – No internal connection
FUNCTION TABLE
INPUTS
OE A/B A
OUTPUT
B
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.
EPIC is a trademark of Texas Instruments Incorporated.
PRODUCT PREVIEW information concerns products in the formative or
design phase of development. Characteristic data and other
specifications are design goals. Texas Instruments reserves the right to
change or discontinue these products without notice.
Copyright © 1998, Texas Instruments Incorporated
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