參數(shù)資料
型號： SN54HCT257
廠商： Texas Instruments, Inc.
英文描述： Quadruple 1-Of-2 Data Selecters(四2選1數(shù)據(jù)選擇器(三態(tài)輸出))
中文描述： 四重1 - 2數(shù)據(jù)Selecters（四2選1數(shù)據(jù)選擇器（三態(tài)輸出））
文件頁數(shù)： 1/6頁
文件大小： 147K
代理商： SN54HCT257
SN54HCT257, SN74HCT257
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS
WITH 3-STATE OUTPUTS
SCLS072A – NOVEMBER 1988 – REVISED MARCH 1996
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Inputs Are TTL-Voltage Compatible
Provide Bus Interface From Multiple
Sources in High-Performance Systems
High-Current 3-State Outputs Interface
Directly With System Bus
Buffered Inputs and Outputs
Package Options Include Ceramic Chip
Carriers (FK) and Standard Plastic (N) and
Ceramic (J) 300-mil DIPs
description
The ’HCT257 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 the high logic level.
The SN54HCT257 is characterized for operation
over the full military temperature range of –55
°
C
to 125
°
C. The SN74HCT257 is characterized for
operation from –40
°
C to 85
°
C.
FUNCTION TABLE
INPUTS
OUTPUT
Y
OE
SELECT
A/B
DATA
A
B
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
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.
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
A/B
1A
1B
1Y
2A
2B
2Y
GND
V
CC
OE
4A
4B
4Y
3A
3B
3Y
SN54HCT257 . . . J PACKAGE
SN74HCT257 . . . N PACKAGE
(TOP VIEW)
3
2 1 20 19
9 10 11 12 13
4
5
6
7
8
18
16
15
14
4A
4B
NC
4Y
3A
1B
1Y
NC
2A
2B
1
A
N
3
3
V
O
2
G
N
SN54HCT257 . . . FK PACKAGE
(TOP VIEW)
NC – No internal connection
Copyright
1996, Texas Instruments Incorporated
UNLESS OTHERWISE NOTED this document contains PRODUCTION
DATA information 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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