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SN74ALS251DRE4 데이터시트(PDF) 1 Page - Texas Instruments

부품명 SN74ALS251DRE4
상세설명  1-OF-8 DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS
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SN54ALS251, SN74ALS251
1OF8 DATA SELECTORS/MULTIPLEXERS
WITH 3STATE OUTPUTS
SDAS215A − APRIL 1982 − REVISED DECEMBER 1994
Copyright
1994, Texas Instruments Incorporated
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251−1443
3-State Version of the ′ALS151
3-State Outputs Interface Directly With
System Bus
Perform Parallel-to-Serial Conversion
Complementary Outputs Provide True and
Inverted Data
Package Options Include Plastic
Small-Outline (D) Packages, Ceramic Chip
Carriers (FK), and Standard Plastic (N) and
Ceramic (J) 300-mil DIPs
description
These data selectors/multiplexers contain full
binary decoding to select one-of-eight data
sources and feature controlled complementary
3-state outputs.
The 3-state outputs can interface with and drive
data lines of bus-organized systems. With all but
one of the common outputs disabled (at the
high-impedance state), the low impedance of the
signal-enabled output drives the bus line to a high
or low logic level. Both outputs are controlled by
the output-enable (OE) input. The outputs are
disabled when OE is high.
The SN54ALS251 is characterized for operation
over the full military temperature range of − 55
°C
to 125
°C. The SN74ALS251 is characterized for
operation from 0
°C to 70°C.
FUNCTION TABLE
INPUTS
OUTPUTS
SELECT
OE
OUTPUTS
C
B
A
OE
Y
W
X
X
X
H
Z
Z
L
LL
L
D0
D0
L
LHL
D1
D1
L
HL
L
D2
D2
L
HH
L
D3
D3
H
LL
L
D4
D4
H
LHL
D5
D5
H
HL
L
D6
D6
H
H
H
L
D7
D7
D0, D1, . . . D7 = the level of the respective D input
SN54ALS251 ...J PACKAGE
SN74ALS251 ...D OR N PACKAGE
(TOP VIEW)
32
1 20 19
910 11 12 13
4
5
6
7
8
18
17
16
15
14
D5
D6
NC
D7
A
D1
D0
NC
Y
W
SN54ALS251 . . . FK PACKAGE
(TOP VIEW)
NC − No internal connection
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
D3
D2
D1
D0
Y
W
OE
GND
VCC
D4
D5
D6
D7
A
B
C
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.


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