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SN74AHC257 PDF预览

SN74AHC257

更新时间: 2024-11-02 05:17:55
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描述
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS

SN74AHC257 数据手册

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SN54AHC257, SN74AHC257  
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS  
WITH 3-STATE OUTPUTS  
SCLS349C – MAY 1996 – REVISED JULY 1998  
SN54AHC257 . . . J OR W PACKAGE  
SN74AHC257 . . . D, DB, DGV, N, OR PW PACKAGE  
(TOP VIEW)  
Operating Range 2-V to 5.5-V V  
CC  
EPIC (Enhanced-Performance Implanted  
CMOS) Process  
A/B  
1A  
V
CC  
1
2
3
4
5
6
7
8
16  
15  
14  
13  
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  
OE  
4A  
4B  
1B  
1Y  
2A  
12 4Y  
11  
10  
9
2B  
3A  
3B  
3Y  
2Y  
GND  
description  
These quadruple 2-line to 1-line data  
selectors/multiplexers are designed for 2-V to  
SN54AHC257 . . . FK PACKAGE  
(TOP VIEW)  
5.5-V V  
operation.  
CC  
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.  
3
2
1 20 19  
18  
4A  
1B  
1Y  
NC  
2A  
2B  
4
5
6
7
8
17 4B  
16  
NC  
15  
4Y  
To ensure the high-impedance state during power  
14  
3A  
up or power down, OE should be tied to V  
CC  
9 10 11 12 13  
through a pullup resistor; the minimum value of  
the resistor is determined by the current-sinking  
capability of the driver.  
NC – No internal connection  
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.  
FUNCTION TABLE  
INPUTS  
OUTPUT  
Y
A/B  
A
X
L
B
X
X
X
L
OE  
H
L
X
L
Z
L
L
L
H
X
X
H
L
L
H
H
L
H
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.  
EPIC is a trademark of Texas Instruments Incorporated.  
Copyright 1998, 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.  
1
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  

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