Page 1
INTEGRATED CIRCUITS
74ALS138
1-of-8 decoder/demultiplexer
Product specification 1996 Jul 03
IC05 Data Handbook
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Philips Semiconductors Product specification
74ALS1381-of-8 decoder/demultiplexer
FEA TURES
PIN CONFIGURATION
•Demultiplexing capability
1
•Multiple input enable for easy expansion
•Ideal for memory chip select decoding
DESCRIPTION
The 74ALS138 decoder accepts three binary weighted inputs (A0,
A1, A2) and when enabled, provides eight mutually exclusive,
active-Low outputs (Q
inputs; two active-Low (E
output will be High unless E
multiple enable function allows easy parallel expansion of the device
to 1-of-32 (5 lines to 32 lines) decoder with just four 74ALS138s and
one inverter. The device can be used as an eight output
demultiplexer by using one of the active-Low Enable inputs as the
data input and the remaining Enable inputs as strobes. Enable
inputs not used must be permanently tied to their appropriate
active-High or active-Low state.
TYPE
74ALS138 12.0ns 4.0mA
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS DESCRIPTION
A0 – A2 Address inputs 1.0/1.0 20µA/0.1mA
E0, E1 Enable inputs (active-Low) 1.0/1.0 20µA/0.1mA
E2 Enable input (active-High) 1.0/1.0 20µA/0.1mA
Q0 – Q7 Data outputs (active-Low) 50/33 1.0mA/20mA
NOTE: One (1.0) ALS unit load is defined as: 20µA in the High state and 0.1mA in the Low state.
0 – Q7). The device features three Enable
0, E1) and one active-High (E2). Every
0 and E1 are Low and E2 is High. This
TYPICAL
PROPAGATION DELAY
TYPICAL
SUPPLY CURRENT
(TOTAL)
ORDERING INFORMA TION
DESCRIPTION COMMERCIAL RANGE
16-pin plastic DIP 74ALS138N SOT38-4
16-pin plastic SO 74ALS138D SOT109-1
A0
2
A1
3
A2
4
E
0
5
E
1
6
E2
7
Q
74ALS (U.L.)
HIGH/LOW
ORDER CODE
V
= 5V ±10%,
CC
T
= 0°C to +70°C
amb
16
V
CC
0
15
Q
Q
14
1
13
2
Q
12
Q3
11
Q4
107
Q5
98GND Q6
LOAD VALUE
HIGH/LOW
SF00174
DRAWING
NUMBER
LOGIC SYMBOL
123
4
5
6
VCC = Pin 16
GND = Pin 8
E0
E1
E2
Q114Q0
15
1996 Jul 03 853–1848 17016
A1 A2A0
Q2 Q3 Q4 Q5
13 12 11 10
Q69Q7
7
SF00175
IEC/IEEE SYMBOL
2
1
2
3
4
5
6
DX
0
G
2
0
0
1
7
2
3
&
15
14
13
12
11
10
9
7
SC00047
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Philips Semiconductors Product specification
74ALS1381-of-8 decoder/demultiplexer
LOGIC DIAGRAM
3
A2
2
A1
1
A0
4
0
E
5
1
E
6
E2
15 14 13 12 11 10 9 7
0Q1Q2Q3Q4Q5Q6Q7
Q
V
= Pin 16
CC
GND = Pin 8
FUNCTION TABLE
INPUTS OUTPUTS
E0 E1 E2 A0 A1 A2 Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7
H X X X X X H H H H H H H H
X H X X X X H H H H H H H H
X X L X X X H H H H H H H H
L L H L L L L H H H H H H H
L L H H L L H L H H H H H H
L L H L H L H H L H H H H H
L L H H H L H H H L H H H H
L L H L L H H H H H L H H H
L L H H L H H H H H H L H H
L L H L H H H H H H H H L H
L L H H H H H H H H H H H L
H = High voltage level
L = Low voltage level
X = Don’t care
SF00177
1996 Jul 03
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Philips Semiconductors Product specification
SYMBOL
PARAMETER
UNIT
SYMBOL
PARAMETER
TEST CONDITIONS
1
UNIT
VOLLow-level output voltage
CC
,
IL
,
74ALS1381-of-8 decoder/demultiplexer
ABSOLUTE MAXIMUM RATINGS
(Operation beyond the limit set forth in this table may impair the useful life of the device.
Unless otherwise noted these limits are over the operating free-air temperature range.)
SYMBOL
V
I
T
V
V
I
OUT
OUT
amb
T
CC
IN
stg
Supply voltage –0.5 to +7.0 V
Input voltage –0.5 to +7.0 V
IN
Input current –30 to +5 mA
Voltage applied to output in High output state –0.5 to V
Current applied to output in Low output state 16 mA
Operating free-air temperature range 0 to +70 °C
Storage temperature range –65 to +150 °C
RECOMMENDED OPERATING CONDITIONS
T
V
V
V
I
I
CC
I
OH
OL
amb
Supply voltage 4.5 5.0 5.5 V
High-level input voltage 2.0 V
IH
Low-level input voltage 0.8 V
IL
Input clamp current –18 mA
Ik
High-level output current –0.4 mA
Low-level output current 8 mA
Operating free-air temperature range 0 +70 °C
PARAMETER RATING UNIT
CC
V
LIMITS
MIN NOM MAX
DC ELECTRICAL CHARACTERISTICS
(Over recommended operating free-air temperature range unless otherwise noted.)
LIMITS
MIN TYP
V
OH
High-level output voltage
p
V
I
I
IH
I
I
I
CC
Input clamp voltage VCC = MIN, II = I
IK
Input current at maximum input
I
voltage
High-level input current VCC = MAX, VI = 2.7V 20 µA
Low-level input current VCC = MAX, VI = 0.4V –0.1 mA
IL
O
Output current
3
Supply current (total) VCC = MAX 4 7 mA
VCC = ±10%, VIL = MAX,
V
= MIN
IH
VCC = MIN, VIL = MAX,
VIH = MIN
IK
IOH = –0.4mA V
I
= 4mA 0.25 0.40 V
OL
I
= 8mA 0.35 0.50 V
OL
VCC = MAX, VI = 7.0V 0.1 mA
VCC = MAX, VO = 2.25V –30 –112 mA
– 2 V
CC
NOTES:
1. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions for the applicable type.
2. All typical values are at V
3. The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, I
= 5V, T
CC
amb
= 25°C.
2
MAX
–0.73 –1.5 V
OS
.
1996 Jul 03
4
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Philips Semiconductors Product specification
74ALS1381-of-8 decoder/demultiplexer
AC ELECTRICAL CHARACTERISTICS
LIMITS
T
= 0°C to +70°C
amb
V
SYMBOL PARAMETER TEST CONDITION
t
t
t
t
t
t
PLH
PHL
PLH
PHL
PLH
PHL
Propagation delay
An
to Qn
Propagation delay
E
1, E2 to Qn
Propagation delay
E2
to Qn
Waveform 1, 2
Waveform 2
Waveform 1
AC WAVEFORMS
For all waveforms, VM = 1.3V.
= +5.0V ± 10%
CC
C
= 50pF, RL = 500Ω
L
MIN MAX
3.0
3.0
3.0
3.0
3.0
3.0
22.0
18.0
17.0
17.0
17.0
17.0
UNIT
ns
ns
ns
An, E2
Qn
V
M
t
PHL
V
M
t
PLH
V
M
V
M
Waveform 1. Propagation Delay for Inverting Outputs
TEST CIRCUIT AND WAVEFORMS
V
CC
V
PULSE
GENERATOR
IN
R
T
Test Circuit for Totem-pole Outputs
DEFINITIONS:
R
= Load resistor;
L
see AC electrical characteristics for value.
CL= Load capacitance includes jig and probe capacitance;
see AC electrical characteristics for value.
R
= Termination resistance should be equal to Z
T
pulse generators.
D.U.T.
V
OUT
C
R
L
L
OUT
SF00179
of
NEGATIVE
PULSE
POSITIVE
PULSE
An, E
0, E1
Qn
V
M
t
PHL
V
M
t
PLH
V
M
V
M
Waveform 2. Propagation Delay for Non-inverting Outputs
90%
10%
w
V
V
M
10%
90%
M
t
THL (tf
t
TLH (tr
)
f
)
t
w
t
TLH (tr
t
THL (tf
10%
)
)
90%
90%
V
M
V
M
10%
t
Input Pulse Definition
Family
Amplitude
74ALS
INPUT PULSE REQUIREMENTS
V
Rep.Rate
M
3.5V
1.3V
1MHz
t
w
500ns
t
TLHtTHL
2.0ns 2.0ns
SF00180
AMP (V)
0.3V
AMP (V)
0.3V
SC00005
1996 Jul 03
5
Page 6
Philips Semiconductors Product specification
74ALS1381-of-8 decoder/demultiplexer
DIP16: plastic dual in-line package; 16 leads (300 mil) SOT38-4
1996 Jul 03
6
Page 7
Philips Semiconductors Product specification
74ALS1381-of-8 decoder/demultiplexer
SO16: plastic small outline package; 16 leads; body width 3.9 mm SOT109-1
1996 Jul 03
7
Page 8
Philips Semiconductors Product specification
74ALS1381-of-8 decoder/demultiplexer
DEFINITIONS
Data Sheet Identification Product Status Definition
Objective Specification
Preliminary Specification
Product Specification
Formative or in Design
Preproduction Product
Full Production
Philips Semiconductors and Philips Electronics North America Corporation reserve the right to make changes, without notice, in the products,
including circuits, standard cells, and/or software, described or contained herein in order to improve design and/or performance. Philips
Semiconductors assumes no responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright,
or mask work right to these products, and makes no representations or warranties that these products are free from patent, copyright, or mask
work right infringement, unless otherwise specified. Applications that are described herein for any of these products are for illustrative purposes
only. Philips Semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing
or modification.
LIFE SUPPORT APPLICA TIONS
Philips Semiconductors and Philips Electronics North America Corporation Products are not designed for use in life support appliances, devices,
or systems where malfunction of a Philips Semiconductors and Philips Electronics North America Corporation Product can reasonably be expected
to result in a personal injury. Philips Semiconductors and Philips Electronics North America Corporation customers using or selling Philips
Semiconductors and Philips Electronics North America Corporation Products for use in such applications do so at their own risk and agree to fully
indemnify Philips Semiconductors and Philips Electronics North America Corporation for any damages resulting from such improper use or sale.
Philips Semiconductors
811 East Arques Avenue
P.O. Box 3409
Sunnyvale, California 94088–3409
Telephone 800-234-7381
This data sheet contains the design target or goal specifications for product development. Specifications
may change in any manner without notice.
This data sheet contains preliminary data, and supplementary data will be published at a later date. Philips
Semiconductors reserves the right to make changes at any time without notice in order to improve design
and supply the best possible product.
This data sheet contains Final Specifications. Philips Semiconductors reserves the right to make changes
at any time without notice, in order to improve design and supply the best possible product.
Copyright Philips Electronics North America Corporation 1997
All rights reserved. Printed in U.S.A.
1996 Jul 03
8
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