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SN54AS250A, SN74AS250A
1 OF 16 DATA GENERATORS/MULTIPLEXERS
WITH 3 STATE OUTPUTS
•
•
•
•
4-Line to 1-Line Multiplexers That Can
Select 1-of-16 Data Inputs
Applications:
Boolean Function Generator
Parallel-to-Serial Converter
Data Source Selector
Buffered 3-State Bus Driver Inputs Permit
Multiplexing From n Lines to One Line
Package Options Include Plastic
Small-Outline (DW) Packages, Ceramic
Chip Carriers (FK), and Standard Plastic
(NT) and Ceramic (JT) 300-mil DIPs
SN54AS250A . . . JT PACKAGE
SN74AS250A . . . DW OR NT PACKAGE
(TOP VIEW)
SDAS137A − DECEMBER 1983 − REVISED DECEMBER 1994
description
The
′AS250A
devices provide full binary decoding
to select 1-of-16 data inputs or use sources as an
input with an inverting W output. The selected
sources are buffered with symmetrical
propagation delay times. This reduces the
possibility of transients occurring at the output.
A buffered output-enable (OE) input can be used
for n-line to 1-line cascading. Taking OE high
places the output in the high-impedance state. In
the high-impedance state, the output neither loads
nor drives the bus lines significantly.
OE does not affect the internal operations of the
data selector/multiplexer. New data can be set up
while the outputs are disabled.
The SN54AS250A is characterized for operation
over the full military temperature range of − 55°C
to 125°C. The SN74AS250A is characterized for
operation from 0°C to 70°C.
E4
E3
E2
NC
E1
E0
OE
E7
E6
E5
E4
E3
E2
E1
E0
OE
W
D
GND
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
V
CC
E8
E9
E10
E11
E12
E13
E14
E15
A
B
C
SN54AS250A . . . FK PACKAGE
(TOP VIEW)
E5
E6
E7
NC
V
CC
E8
E9
5
6
7
8
9
10
4 3 2 1 28 27 26
25
24
23
22
21
20
11
19
12 13 14 15 16 17 18
E10
E11
E12
NC
E13
E14
E15
NC − No internal connection
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
POST OFFICE BOX 1443
•
HOUSTON, TEXAS 77251−1443
•
DALLAS, TEXAS 75265
W
D
GND
NC
C
B
A
Copyright
1994, Texas Instruments Incorporated
1
SDAS137A − DECEMBER 1983 − REVISED DECEMBER 1994
SN54AS250A, SN74AS250A
1 OF 16 DATA GENERATORS/MULTIPLEXERS
WITH 3 STATE OUTPUTS
FUNCTION TABLE
INPUTS
OE
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
H
A
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
X
B
L
L
H
H
L
L
H
H
L
L
H
H
L
L
H
H
X
C
L
L
L
L
H
H
H
H
L
L
L
L
H
H
H
H
X
D
L
L
L
L
L
L
L
L
H
H
H
H
H
H
H
H
X
Ei
E0
E1
E2
E3
E4
E5
E6
E7
E8
E9
E10
E11
E12
E13
E14
E15
X
OUTPUT
W
E0
E1
E2
E3
E4
E5
E6
E7
E8
E9
E10
E11
E12
E13
E14
E15
Z
OE
A
B
C
D
E0
E1
E2
E3
E4
E5
E6
E7
E8
E9
E10
E11
E12
E13
E14
E15
logic symbol
†
9
15
14
13
11
8
7
6
5
4
3
2
1
23
22
21
20
19
18
17
16
10
W
3
G
MUX
EN
0
0
15
† This symbol is in accordance with ANSI/IEEE Std 91-1984 and
IEC Publication 617-12.
Pin numbers shown are for the DW, JT, and NT packages.
2
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
•
•
SN54AS250A, SN74AS250A
1 OF 16 DATA GENERATORS/MULTIPLEXERS
WITH 3 STATE OUTPUTS
SDAS137A − DECEMBER 1983 − REVISED DECEMBER 1994
logic diagram (positive logic)
E0
E1
8
7
6
5
4
3
E2
E3
E4
E5
E6
E7
Data
Inputs
E8
E9
E10
E11
2
1
23
10
W
22
21
20
E12
E13
E14
19
18
17
16
15
A
A
E15
A
B
Data
Selects
C
14
B
B
13
C
C
D
11
D
D
OE
Pin numbers shown are for the DW, JT, and NT packages.
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
•
•
3
SDAS137A − DECEMBER 1983 − REVISED DECEMBER 1994
SN54AS250A, SN74AS250A
1 OF 16 DATA GENERATORS/MULTIPLEXERS
WITH 3 STATE OUTPUTS
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
†
Supply voltage, V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Input voltage, V
I
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Operating free-air temperature range, T
A
: SN54AS250A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −55°C to 125°C
SN74AS250A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C
Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65°C to 150°C
† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
recommended operating conditions
SN54AS250A
MIN
VCC
VIH
VIL
IOH
IOL
TA
Supply voltage
High-level input voltage
Low-level input voltage
High-level output current
Low-level output current
Operating free-air temperature
−55
4.5
2
0.8
−12
32
125
0
NOM
5
MAX
5.5
SN74AS250A
MIN
4.5
2
0.8
−15
48
70
NOM
5
MAX
5.5
UNIT
V
V
V
mA
mA
°C
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
VIK
VOH
TEST CONDITIONS
VCC = 4.5 V,
VCC = 4.5 V to 5.5 V,
VCC = 4.5 V
VCC = 4.5 V
VCC = 5.5 V,
VCC = 5.5 V,
VCC = 5.5 V,
VCC = 5.5 V,
VCC = 5.5 V,
VCC = 5.5 V,
VCC = 5.5 V
II = − 18 mA
IOH = − 2 mA
IOH = − 12 mA
IOH = − 15 mA
IOL = 32 mA
IOL = 48 mA
VO = 2.7 V
VO = 0.4 V
VI = 7 V
VI = 2.7 V
VI = 0.4 V
VO = 2.25 V
Outputs high
ICC
Outputs low
Outputs disabled
−30
26
31
30
SN54AS250A
MIN TYP‡
MAX
−1.2
VCC − 2
2.4
VCC − 2
3.3
2.4
0.35
0.5
0.35
50
−50
0.1
20
−0.5
−112
42
50
48
−30
26
31
30
0.5
50
−50
0.1
20
−0.5
−112
42
50
48
mA
V
µA
µA
mA
µA
mA
mA
3.3
V
SN74AS250A
MIN TYP‡
MAX
−1.2
UNIT
V
VOL
IOZH
IOZL
II
IIH
IIL
IO
§
‡ All typical values are at VCC = 5 V, TA = 25°C.
§ The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS.
4
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
•
•
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