Texas Instruments SN74AS250ADW, SN74AS250ADWR, SN74AS250ANT, SN74AS250ANT3, SNJ54AS250AJT Datasheet
SN54AS250A, SN74AS250A
1-OF-16 DATA GENERATORS/MULTIPLEXERS
WITH 3-STATE OUTPUTS
SDAS137A – DECEMBER 1983 – REVISED DECEMBER 1994
• 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
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
sources are buffered with symmetrical
propagation delay times. This reduces the
possibility of transients occurring at the output.
A buffered output-enable (OE
for n-line to 1-line cascading. Taking OE
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.
output. The selected
) input can be used
high
SN54AS250A ...JT PACKAGE
SN74AS250A . . . DW OR NT PACKAGE
SN54AS250A . . . FK PACKAGE
E4
E3
E2
NC
E1
E0
OE
NC – No internal connection
E7
E6
E5
E4
E3
E2
E1
E0
OE
W
GND
4
5
6
7
8
9
10
11
12
(TOP VIEW)
1
2
3
4
5
6
7
8
9
10
D
11
12
(TOP VIEW)
E5E6E7
321
13 14
D
W
24
23
22
21
20
19
18
17
16
15
14
13
CC
VE8E9
NC
28 27 26
15 16 17 18
C
NC
GND
V
E8
E9
E10
E1 1
E12
E13
E14
E15
A
B
C
B
CC
E10
25
E1 1
24
23
E12
22
NC
21
E13
20
E14
19
E15
A
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 1994, Texas Instruments Incorporated
1
†
SN54AS250A, SN74AS250A
1-OF-16 DATA GENERATORS/MULTIPLEXERS
WITH 3-STATE OUTPUTS
SDAS137A – DECEMBER 1983 – REVISED DECEMBER 1994
FUNCTION TABLE
INPUTS
OE A B C D Ei
L L L L L E0 E0
L H LLLE1 E1
LLHLLE2 E2
LHHLLE3 E3
LLLHLE4 E4
LHLHLE5 E5
LLHHLE6 E6
LHHHLE7 E7
LLLLHE8 E8
LHLLHE9 E9
LLH L H E10 E10
L H HLHE11E11
L L L H H E12 E12
L H L H H E13 E13
L L H H H E14 E14
L H H H H E15 E15
H X X X X X Z
OUTPUT
W
logic symbol
9
OE
15
A
14
B
13
C
11
D
8
E0
7
E1
6
E2
5
E3
4
E4
3
E5
2
E6
1
E7
23
E8
22
E9
21
E10
20
E11
19
E12
18
E13
17
E14
16
E15
EN
0
3
G
MUX
0
15
10
W
†
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
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logic diagram (positive logic)
8
E0
7
E1
6
E2
5
E3
4
E4
3
E5
2
E6
1
Data
Inputs
E7
E8
23
SN54AS250A, SN74AS250A
1-OF-16 DATA GENERATORS/MULTIPLEXERS
WITH 3-STATE OUTPUTS
SDAS137A – DECEMBER 1983 – REVISED DECEMBER 1994
10
W
Data
Selects
E9
E10
E11
E12
E13
E14
E15
22
21
20
19
18
17
16
15
A
14
B
13
C
11
D
A
A
B
B
C
C
D
D
OE
Pin numbers shown are for the DW, JT, and NT packages.
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
3
SN54AS250A, SN74AS250A
UNIT
PARAMETER
TEST CONDITIONS
UNIT
V
4.5 V
V
V
V
V
1-OF-16 DATA GENERATORS/MULTIPLEXERS
WITH 3-STATE OUTPUTS
SDAS137A – DECEMBER 1983 – REVISED DECEMBER 1994
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, V
Input voltage, V
Operating free-air temperature range, T
7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CC
7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I
: SN54AS250A –55°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A
†
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 SN74AS250A
MIN NOM MAX MIN NOM MAX
V
V
V
I
I
T
CC
IH
IL
OH
OL
A
Supply voltage 4.5 5 5.5 4.5 5 5.5 V
High-level input voltage 2 2 V
Low-level input voltage 0.8 0.8 V
High-level output current –12 –15 mA
Low-level output current 32 48 mA
Operating free-air temperature –55 125 0 70 °C
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
SN54AS250A SN74AS250A
MIN TYP‡MAX MIN TYP‡MAX
V
IK
V
OH
OL
I
OZH
I
OZL
I
I
I
IH
I
IL
§
I
O
I
CC
‡
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.
VCC = 4.5 V, II = –18 mA –1.2 –1.2 V
VCC = 4.5 V to 5.5 V, IOH = –2 mA VCC –2 VCC –2
=
CC
= 4.5
CC
VCC = 5.5 V, VO = 2.7 V 50 50 µA
VCC = 5.5 V, VO = 0.4 V –50 –50 µA
VCC = 5.5 V, VI = 7 V 0.1 0.1 mA
VCC = 5.5 V, VI = 2.7 V 20 20 µA
VCC = 5.5 V, VI = 0.4 V –0.5 –0.5 mA
VCC = 5.5 V, VO = 2.25 V –30 –112 –30 –112 mA
VCC = 5.5 V
IOH = –12 mA 2.4 3.3
IOH = –15 mA 2.4 3.3
IOL = 32 mA 0.35 0.5
IOL = 48 mA 0.35 0.5
Outputs high 26 42 26 42
Outputs low 31 50 31 50
Outputs disabled 30 48 30 48
V
mA
4
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SN54AS250A, SN74AS250A
Data
W
ns
A, B, C, D
W
ns
OE
W
ns
OE
W
ns
1-OF-16 DATA GENERATORS/MULTIPLEXERS
WITH 3-STATE OUTPUTS
SDAS137A – DECEMBER 1983 – REVISED DECEMBER 1994
switching characteristics (see Figure 1)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
PARAMETER
t
PLH
t
PHL
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
†
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
PLZ
FROM
(INPUT)
TO
(OUTPUT)
R1 = 500 Ω
R2 = 500 Ω,
TA = MIN to MAX
SN54AS250A SN74AS250A
MIN MAX MIN MAX
2 9.5 2 8
2 8.5 2 7
4 15.5 4 13
4 12 4 10.5
2 7.5 2 7
2 10 2 9
1.5 6.5 1.5 6
2 8.5 2 6.5
,
†
UNIT
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
5
SN54AS250A, SN74AS250A
1-OF-16 DATA GENERATORS/MULTIPLEXERS
WITH 3-STATE OUTPUTS
SDAS137A – DECEMBER 1983 – REVISED DECEMBER 1994
PARAMETER MEASUREMENT INFORMATION
SERIES 54ALS/74ALS AND 54AS/74AS DEVICES
From Output
Under Test
(see Note A)
C
L
Test
Point
R
L
From Output
Under Test
C
(see Note A)
L
7 V
V
CC
S1
R
L
Test
Point
From Output
Under Test
(see Note A)
R1
C
L
RL = R1 = R2
Test
Point
R2
LOAD CIRCUIT FOR
BI-STATE
TOTEM-POLE OUTPUTS
Timing
Input
t
su
Data
Input
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
Output
Control
(low-level
enabling)
Waveform 1
S1 Closed
(see Note B)
Waveform 2
S1 Open
(see Note B)
t
PZL
t
PZH
ENABLE AND DISABLE TIMES, 3-STATE OUTPUTS
VOLTAGE WAVEFORMS
1.3 V
t
PHZ
1.3 V
1.3 V
t
1.3 V1.3 V
1.3 V1.3 V
FOR OPEN-COLLECTOR OUTPUTS
h
t
PLZ
LOAD CIRCUIT
3.5 V
0.3 V
3.5 V
0.3 V
3.5 V
0.3 V
[
3.5 V
V
OL
0.3 V
V
OH
0.3 V
[
0 V
High-Level
Low-Level
Out-of-Phase
(see Note C)
Pulse
Pulse
Input
In-Phase
Output
Output
LOAD CIRCUIT
FOR 3-STATE OUTPUTS
1.3 V 1.3 V
t
w
1.3 V 1.3 V
VOLTAGE WAVEFORMS
PULSE DURATIONS
1.3 V 1.3 V
t
PLH
t
PHL
1.3 V 1.3 V
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
1.3 V1.3 V
t
PHL
t
PLH
3.5 V
0.3 V
3.5 V
0.3 V
3.5 V
0.3 V
V
V
V
V
OH
OL
OH
OL
NOTES: A. CL includes probe and jig capacitance.
B. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.
Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.
C. When measuring propagation delay items of 3-state outputs, switch S1 is open.
D. All input pulses have the following characteristics: PRR ≤ 1 MHz, tr = tf = 2 ns, duty cycle = 50%.
E. The outputs are measured one at a time with one transition per measurement.
Figure 1. Load Circuits and Voltage Waveforms
6
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