SN54F251B Datasheet, PDF (1/7 Pages) Texas Instruments – 1-OF-8 DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS

• 3-State Versions of SN54F151B and
SN74F151B
• 3-State Outputs Interface Directly With
System Bus
• Performs Parallel-to-Serial Conversion
• 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
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)
D3 1
D2 2
D1 3
D0 4
Y5
W6
G7
GND 8
16 V_CC
15 D4
14 D5
13 D6
12 D7
11 A
10 B
9C
description
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.
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.
SN54F251B . . . FK PACKAGE
(TOP VIEW)
3 2 1 20 19
D1 4
18 D5
D0 ⁵
17 _D6
NC ⁶
16 _NC
Y⁷
15 _D7
W
8
14
9 10 11 12 13
A
NC – No internal connection
FUNCTION TABLE
INPUTS
SELECT
C
B
A
STROBE
G
OUTPUTS
Y
W
X
X
X
H
Z
Z
L
L
L
L
D0 D0
L
L
H
L
D1 D1
L
H
L
L
D2 D2
L
H
H
L
D3 D3
H
L
L
L
D4 D4
H
L
H
L
D5 D5
H
H
L
L
D6 D6
H
H
H
L
D7 D7
D0, D1, . . . D7 = the level of the respective D input.
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.
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
Copyright © 1993, Texas Instruments Incorporated
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