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SN74F251AD

更新时间： 2024-11-21 13:13:47
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德州仪器 - TI 复用器输出元件
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SN74F251AD 数据手册

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SN54F251B, SN74F251B  
1-OF-8 DATA SELECTORS/MULTIPLEXERS  
WITH 3-STATE OUTPUTS  
SDFS066A – MARCH 1987 – REVISED OCTOBER 1993  
SN54F251B . . . J PACKAGE  
SN74F251B . . . D OR N PACKAGE  
(TOP VIEW)  
• 3-State Versions of SN54F151B and  
SN74F151B  
• 3-State Outputs Interface Directly With  
System Bus  
1
2
3
4
5
6
7
8
16  
15  
14  
13  
12  
11  
10  
9
D3  
D2  
D1  
D0  
Y
W
G
GND  
V
CC  
• Performs Parallel-to-Serial Conversion  
D4  
D5  
D6  
D7  
A
• Complementary Outputs Provide True and  
Inverted Data  
• Package Options Include Plastic  
Small-Outline Packages, Ceramic Chip  
Carriers, and Standard Plastic and Ceramic  
300-mil DIPs  
B
C
description  
SN54F251B . . . FK PACKAGE  
(TOP VIEW)  
These data selectors/multiplexers contain full  
binary decoding to select one of eight data  
sources  
and  
feature  
strobe-controlled  
complementary outputs. The 3-state outputs can  
interface with and drive data lines of bus-  
organized systems. When the strobe (G) input is  
high, both outputs are in a high-impedance state  
in which both the upper and lower transistors of  
each totem-pole output are off, and the output  
neither drives nor loads the bus significantly.  
3
2
1
20 19  
18  
4
5
6
7
8
D5  
D6  
NC  
D7  
A
D1  
D0  
NC  
Y
17  
16  
15  
14  
W
9 10 11 12 13  
The SN54F251B is characterized for operation  
over the full military temperature range of –55°C  
to 125°C. The SN74F251B is characterized for  
operation from 0°C to 70°C.  
NC – No internal connection  
FUNCTION TABLE  
INPUTS  
SELECT  
OUTPUTS  
STROBE  
G
C
X
L
B
X
L
A
X
L
Y
W
Z
H
L
L
L
L
L
L
L
L
Z
D0  
D1  
D2  
D3  
D4  
D5  
D6  
D7  
D0  
D1  
D2  
D3  
D4  
D5  
D6  
D7  
L
L
H
L
L
H
H
L
L
H
L
H
H
H
H
L
H
L
H
H
H
D0, D1, . . . D7 = the level of the respective D input.  
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  
1234567

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