Datasheet

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
SDAS216A − 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 Versions of the ′ALS153 and
SN74AS153
• Permits Multiplexing From n Lines to
One Line
• Performs Parallel-to-Serial Conversion
• 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
inverters and drivers to supply full binary decoding
data selection to the AND-OR gates. Separate
output control inputs are provided for each of the
two 4-line sections.
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 a
high-impedance state), the low impedance of the
single enabled output drives the bus line to a high
or low logic level. Each output has its own
output-enable (OE
) input. The output is disabled
when OE
is high.
The SN54ALS253 is characterized for operation
over the full military temperature range of −55°C
to 125°C. The SN74ALS253 and SN74AS253A
are characterized for operation from 0°C to 70°C.
FUNCTION TABLE
INPUTS
OUTPUT
SELECT
†
DATA
OE
OUTPUT
Y
B A C0 C1 C2 C3
OE
Y
X X X X X X H Z
L LLXXXL L
L LHXXXL H
L HXLXXL L
L HXHXXL H
H LXXLXL L
H LXXHXL H
H HXXXLL L
H H X X X H L H
†
Select inputs A and B are common to both sections.
SN54ALS253 ...J PACKAGE
SN74ALS253, SN74AS253A ...D OR N PACKAGE
(TOP VIEW)
3212019
910111213
4
5
6
7
8
18
17
16
15
14
A
2C3
NC
2C2
2C1
1C3
1C2
NC
1C1
1C0
SN54ALS253 . . . FK PACKAGE
(TOP VIEW)
B 1OE NC
2Y
2C0
2OE
1Y
GND
NC
NC − No internal connection
V
CC
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
1OE
B
1C3
1C2
1C1
1C0
1Y
GND
V
CC
2OE
A
2C3
2C2
2C1
2C0
2Y
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