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SN54F257

更新时间： 2024-11-17 22:53:39
品牌 Logo 应用领域
德州仪器 - TI 复用器输出元件
页数 文件大小 规格书
5页 77K
描述
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS

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SN54F257 数据手册

 浏览型号SN54F257的Datasheet PDF文件第2页浏览型号SN54F257的Datasheet PDF文件第3页浏览型号SN54F257的Datasheet PDF文件第4页浏览型号SN54F257的Datasheet PDF文件第5页 
SN54F257, SN74F257  
QUADRUPLE 2-LINE TO 1-LINE DATA SELECTORS/MULTIPLEXERS  
WITH 3-STATE OUTPUTS  
SDFS065A – D2932, MARCH 1987 – REVISED OCTOBER 1993  
SN54F257 . . . J PACKAGE  
SN74F257 . . . D OR N PACKAGE  
(TOP VIEW)  
• 3-State Outputs Interface Directly With  
System Bus  
• Provides Bus Interface From Multiple  
Sources in High-Performance Systems  
V
A/B  
1A  
1B  
1Y  
2A  
2B  
2Y  
GND  
1
2
3
4
5
6
7
8
16  
15  
14  
13  
12  
11  
10  
9
CC  
• Package Options Include Plastic  
Small-Outline Packages, Ceramic Chip  
Carriers, and Standard Plastic and Ceramic  
300-mil DIPs  
OE  
4A  
4B  
4Y  
3A  
3B  
3Y  
description  
The ′F257 is designed to multiplex signals from  
4-bit data sources to 4-output data lines in  
bus-organized systems. The 3-state outputs will  
not load the data lines when the output enable  
(OE) input is at a high logic level.  
SN54F257 . . . FK PACKAGE  
(TOP VIEW)  
The SN54F257 is characterized for operation over  
the full military temperature range of –55°C to  
125°C. The SN74F257 is characterized for  
operation from 0°C to 70°C.  
3
2
1
20 19  
18  
4A  
4B  
NC  
4Y  
3A  
1B  
1Y  
NC  
2A  
2B  
4
5
6
7
8
17  
16  
15  
14  
FUNCTION TABLE  
INPUTS  
OUTPUT  
9 10 11 12 13  
Y
Z
L
OE  
H
L
A/B  
X
A
X
L
B
X
X
X
L
L
L
L
H
X
X
H
L
NC – No internal connection  
L
H
L
H
H
H
†
logic symbol  
15  
1
EN  
G1  
OE  
A/B  
2
1A  
1B  
2A  
2B  
3A  
3B  
4A  
4B  
MUX  
4
1
1
3
1Y  
5
7
6
2Y  
11  
10  
14  
13  
9
3Y  
12  
4Y  
†
This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.  
Pin numbers shown are for the D, J, and N packages.  
Copyright 1993, Texas Instruments Incorporated  
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.  
2–1  
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265  
12345

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