Texas Instruments JM38510-37701BEA, JM38510-37701B2A, SN54ALS138AJ, SN54AS138J, SN74ALS138AD Datasheet
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SN54ALS138A, SN54AS138, SN74ALS138A, SN74AS138
3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS
SDAS055E – APRIL 1982 – REVISED JUL Y 1996
D
Designed Specifically for High-Speed
Memory Decoders and Data Transmission
Systems
D
Incorporate Three Enable Inputs to Simplify
Cascading and/or Data Reception
D
Package Options Include Plastic
Small-Outline (D) Packages, Ceramic Chip
Carriers (FK), and Standard Plastic (N) and
Ceramic (J) 300-mil DIPs
description
SN54ALS138A, SN54AS138 ...J PACKAGE
SN74ALS138A, SN74AS138 ...D OR N PACKAGE
G2A
G2B
G1
Y7
GND
(TOP VIEW)
A
1
B
2
C
3
4
5
6
7
8
16
15
14
13
12
11
10
V
CC
Y0
Y1
Y2
Y3
Y4
Y5
Y6
9
The ′ALS138A and ′AS138 are 3-line to 8-line
decoders/demultiplexers designed for highperformance memory-decoding or data-routing
SN54ALS138A, SN54AS138 . . . FK PACKAGE
(TOP VIEW)
applications requiring very short propagation
delay times. In high-performance systems, these
devices can be used to minimize the effects of
system decoding. When employed with
high-speed memories with a fast enable circuit,
the delay times of the decoder and the enable time
of the memory are usually less than the typical
access time of the memory . The ef fective system
delay introduced by the Schottky-clamped system
decoder is negligible.
The conditions at the binary-select (A, B, and C)
inputs and the three enable (G1, G2A
, and G2B)
inputs select one of eight output lines. Two
BANC
3 2 1 20 19
C
4
NC
G1
5
6
7
8
910111213
Y7
G2A
G2B
NC – No internal connection
GND
NC
CC
V
Y6
Y0
18
17
16
15
14
Y5
Y1
Y2
NC
Y3
Y4
active-low and one active-high enable inputs
reduce the need for external gates or inverters when expanding. A 24-line decoder can be implemented without
external inverters and a 32-line decoder requires only one inverter. An enable input can be used as a data input
for demultiplexing applications.
The SN54ALS138A and SN54AS138 are characterized for operation over the full military temperature range
of –55°C to 125°C. The SN74ALS138A and SN74AS138 are characterized for operation from 0°C to 70°C.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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 1996, Texas Instruments Incorporated
1
SN54ALS138A, SN54AS138, SN74ALS138A, SN74AS138
OUTPUTS
3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS
SDAS055E – APRIL 1982 – REVISED JUL Y 1996
FUNCTION TABLE
INPUTS
ENABLE SELECT
G1 G2A G2B C B A Y0 Y1 Y2 Y3 Y4 Y5 Y6 Y7
X H X X X X H H H H H H H H
X XHXXXHHHHHHHH
LXXXXXHHHHHHHH
HLLLLLLHHHHHHH
HLLLLHHLHHHHHH
HLLLHLHHLHHHHH
HLLLHHHHHLHHHH
HLLHLLHHHHLHHH
HLLHLHHHHHHLHH
HLLHHLHHHHHHLH
HL LHHHHHHHHHHL
logic symbols (alternatives)
1
A
2
B
3
C
6
G1
4
G2A
5
G2B
†
These symbols are in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.
Pin numbers shown are for the D, J, and N packages.
BIN/OCT
1
2
4
&
EN
†
15
0
1
2
3
4
5
6
7
14
13
12
11
10
Y0
Y1
Y2
Y3
Y4
Y5
9
Y6
7
Y7
G1
G2A
G2B
1
A
2
B
3
C
6
4
5
DMUX
0
G
2
&
0
0
1
7
2
3
4
5
6
7
15
14
13
12
11
10
Y0
Y1
Y2
Y3
Y4
Y5
9
Y6
7
Y7
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
logic diagram (positive logic)
1
A
Select
Inputs
Enable
Inputs
G2A
G2B
G1
2
B
3
C
4
5
6
SN54ALS138A, SN54AS138, SN74ALS138A, SN74AS138
3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS
SDAS055E – APRIL 1982 – REVISED JUL Y 1996
15
Y0
14
Y1
13
Y2
12
11
10
Y3
Y4
Y5
9
Y6
7
Y7
Data
Outputs
Pin numbers shown are for the D, J, and N packages.
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
3
SN54ALS138A, SN54AS138, SN74ALS138A, SN74AS138
UNIT
PARAMETER
TEST CONDITIONS
UNIT
V
V
V
V
(
)
(
)
(INPUT)
(OUTPUT)
A, B, C
Any Y
ns
G
G
Any Y
ns
3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS
SDAS055E – APRIL 1982 – REVISED JUL Y 1996
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
: SN54ALS138A –55°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . .
A
†
SN74ALS138A 0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
†
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.
–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
stg
recommended operating conditions
SN54ALS138A SN74ALS138A
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 0.7 0.8 V
High-level output current –0.4 –0.4 mA
Low-level output current 4 8 mA
Operating free-air temperature –55 125 0 70 °C
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
SN54ALS138A SN74ALS138A
MIN TYP‡MAX MIN TYP‡MAX
V
IK
V
OH
OL
I
I
I
IH
I
IL
§
I
O
I
‡
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.
CC
VCC = 4.5 V, II = –18 mA –1.5 –1.5 V
VCC = 4.5 V, IOH = –0.4 mA VCC –2 VCC –2 V
= 4.5
CC
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 –0.1 –0.1 mA
VCC = 5.5 V, VO = 2.25 V –20 –112 –30 –112 mA
VCC = 5.5 V 5 10 5 10 mA
IOL = 4 mA 0.25 0.4 0.25 0.4
IOL = 8 mA 0.35 0.5
switching characteristics (see Figure 1)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
PARAMETER
t
PLH
t
PHL
t
PLH
t
¶
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
4
PHL
FROM
INPUT
or
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TO
OUTPUT
RL = 500 Ω
TA = MIN to MAX
SN54ALS138A SN74ALS138A
MIN MAX MIN MAX
2 28 5 22
6 22 6 18
2 22 3 17
4 21 4 17
,
¶
UNIT
UNIT
PARAMETER
TEST CONDITIONS
UNIT
SN54ALS138A, SN54AS138, SN74ALS138A, SN74AS138
3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS
SDAS055E – APRIL 1982 – REVISED JUL Y 1996
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
: SN54AS138 –55°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A
†
SN74AS138 0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
†
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.
–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
stg
recommended operating conditions
SN54AS138 SN74AS138
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 –2 –2 mA
Low-level output current 20 20 mA
Operating free-air temperature –55 125 0 70 °C
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
SN54AS138 SN74AS138
MIN TYP‡MAX MIN TYP‡MAX
V
IK
V
OH
V
OL
I
I
I
IH
I
IL
§
I
O
I
CCH
I
‡
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.
CCL
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 V
VCC = 4.5 V, IOL = 20 mA 0.35 0.5 0.35 0.5 V
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 12 17.5 12 17.5 mA
VCC = 5.5 V 14 20 14 20 mA
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
5
SN54ALS138A, SN54AS138, SN74ALS138A, SN74AS138
(
)
(
)
(INPUT)
(OUTPUT)
A, B, C
Any Y
ns
G1
Any Y
ns
G2
Any Y
ns
3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS
SDAS055E – APRIL 1982 – REVISED JUL Y 1996
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
PLH
t
†
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
PHL
FROM
INPUT
TO
OUTPUT
RL = 500 Ω
TA = MIN to MAX
SN54AS138 SN74AS138
MIN MAX MIN MAX
2 11 2 10
2 11 2 9.5
2 11.5 2 10
2 11 2 10
2 9 2 7.5
2 10 2 8.5
,
†
UNIT
6
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
From Output
Under Test
(see Note A)
SN54ALS138A, SN54AS138, SN74ALS138A, SN74AS138
3-LINE TO 8-LINE DECODERS/DEMULTIPLEXERS
SDAS055E – APRIL 1982 – REVISED JUL Y 1996
PARAMETER MEASUREMENT INFORMATION
SERIES 54ALS/74ALS AND 54AS/74AS DEVICES
7 V
V
CC
S1
R
L
Test
Point
C
L
R
L
From Output
Under Test
C
(see Note A)
Test
Point
L
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
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
7
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Copyright 1998, Texas Instruments Incorporated
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