74ALS138

更新时间:2024-10-29 02:24:56
品牌:NXP
描述:1-of-8 decoder/demultiplexer

74ALS138 概述

1-of-8 decoder/demultiplexer 1 - 8解码器/多路解复用器

74ALS138 数据手册

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INTEGRATED CIRCUITS  
74ALS138  
1-of-8 decoder/demultiplexer  
Product specification  
IC05 Data Handbook  
1996 Jul 03  
Philips  
Semiconductors  
Philips Semiconductors  
Product specification  
1-of-8 decoder/demultiplexer  
74ALS138  
FEATURES  
PIN CONFIGURATION  
Demultiplexing capability  
A0  
A1  
A2  
E0  
E1  
1
2
3
4
5
16  
V
Multiple input enable for easy expansion  
Ideal for memory chip select decoding  
CC  
15 Q0  
14 Q1  
13 Q2  
12 Q3  
11 Q4  
10 Q5  
DESCRIPTION  
The 74ALS138 decoder accepts three binary weighted inputs (A0,  
A1, A2) and when enabled, provides eight mutually exclusive,  
active-Low outputs (Q0 – Q7). The device features three Enable  
inputs; two active-Low (E0, E1) and one active-High (E2). Every  
output will be High unless E0 and E1 are Low and E2 is High. This  
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.  
E2  
Q7  
6
7
8
GND  
9
Q6  
SF00174  
ORDERING INFORMATION  
ORDER CODE  
DRAWING  
NUMBER  
DESCRIPTION  
COMMERCIAL RANGE  
V
amb  
= 5V ±10%,  
= 0°C to +70°C  
CC  
TYPICAL  
TYPICAL  
PROPAGATION DELAY  
T
SUPPLY CURRENT  
(TOTAL)  
TYPE  
16-pin plastic DIP  
16-pin plastic SO  
74ALS138N  
74ALS138D  
SOT38-4  
SOT109-1  
74ALS138  
12.0ns  
4.0mA  
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE  
74ALS (U.L.)  
LOAD VALUE  
PINS  
DESCRIPTION  
HIGH/LOW  
1.0/1.0  
1.0/1.0  
1.0/1.0  
50/33  
HIGH/LOW  
20µA/0.1mA  
20µA/0.1mA  
20µA/0.1mA  
1.0mA/20mA  
A0 – A2  
E0, E1  
E2  
Address inputs  
Enable inputs (active-Low)  
Enable input (active-High)  
Data outputs (active-Low)  
Q0 – Q7  
NOTE: One (1.0) ALS unit load is defined as: 20µA in the High state and 0.1mA in the Low state.  
LOGIC SYMBOL  
IEC/IEEE SYMBOL  
1
2
3
DX  
1
2
3
15  
14  
13  
12  
11  
10  
9
0
1
2
0
2
0
7
G
A0 A1 A2  
4
5
E0  
E1  
E2  
3
6
Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7  
4
5
6
&
15 14 13 12 11 10  
9
7
7
V
= Pin 16  
CC  
GND = Pin 8  
SF00175  
SC00047  
2
1996 Jul 03  
853–1848 17016  
Philips Semiconductors  
Product specification  
1-of-8 decoder/demultiplexer  
74ALS138  
LOGIC DIAGRAM  
3
A2  
2
A1  
1
A0  
4
E0  
5
E1  
6
E2  
15  
Q0  
14  
Q1  
13  
Q2  
12  
Q3  
11  
Q4  
10  
9
7
Q5  
Q6  
Q7  
V
= Pin 16  
CC  
GND = Pin 8  
SF00177  
FUNCTION TABLE  
INPUTS  
E2 A0  
OUTPUTS  
Q3  
E0  
H
X
X
L
E1  
X
H
X
L
A1  
A2  
X
X
X
L
Q0  
H
H
H
L
Q1  
H
H
H
H
L
Q2  
H
H
H
H
H
L
Q4  
H
H
H
H
H
H
H
L
Q5  
H
H
H
H
H
H
H
H
L
Q6  
H
H
H
H
H
H
H
H
H
L
Q7  
H
H
H
H
H
H
H
H
H
H
L
X
X
L
X
X
X
L
X
X
X
L
H
H
H
H
H
H
L
H
H
H
H
H
H
H
H
L
L
H
L
L
L
H
H
H
H
H
H
H
L
L
H
H
L
L
H
H
H
H
H
H
L
L
H
L
L
H
H
H
H
H
L
L
H
H
H
H
H
H
H
H
L
L
H
L
L
H
H
H
L
L
H
H
H
H
L
L
H
H
H
L
X
=
=
=
High voltage level  
Low voltage level  
Don’t care  
3
1996 Jul 03  
Philips Semiconductors  
Product specification  
1-of-8 decoder/demultiplexer  
74ALS138  
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  
PARAMETER  
RATING  
–0.5 to +7.0  
–0.5 to +7.0  
–30 to +5  
UNIT  
V
V
CC  
Supply voltage  
Input voltage  
Input current  
V
V
IN  
IN  
I
mA  
V
V
OUT  
Voltage applied to output in High output state  
Current applied to output in Low output state  
Operating free-air temperature range  
Storage temperature range  
–0.5 to V  
16  
CC  
I
mA  
°C  
°C  
OUT  
T
amb  
0 to +70  
T
stg  
–65 to +150  
RECOMMENDED OPERATING CONDITIONS  
LIMITS  
NOM  
5.0  
SYMBOL  
PARAMETER  
UNIT  
MAX  
MIN  
4.5  
V
CC  
Supply voltage  
5.5  
V
V
V
IH  
High-level input voltage  
Low-level input voltage  
Input clamp current  
2.0  
V
IL  
0.8  
–18  
–0.4  
8
V
I
Ik  
mA  
mA  
mA  
°C  
I
High-level output current  
Low-level output current  
OH  
I
OL  
T
amb  
Operating free-air temperature range  
0
+70  
DC ELECTRICAL CHARACTERISTICS  
(Over recommended operating free-air temperature range unless otherwise noted.)  
LIMITS  
1
SYMBOL  
PARAMETER  
TEST CONDITIONS  
UNIT  
2
MIN  
TYP  
MAX  
V
V
= ±10%, V = MAX,  
= MIN  
CC  
IH  
IL  
V
OH  
High-level output voltage  
I
= –0.4mA  
V
CC  
– 2  
V
OH  
I
I
= 4mA  
= 8mA  
0.25  
0.35  
0.40  
0.50  
–1.5  
V
V
V
OL  
V
V
= MIN, V = MAX,  
IL  
= MIN  
CC  
IH  
V
Low-level output voltage  
Input clamp voltage  
OL  
OL  
V
V
= MIN, I = I  
IK  
–0.73  
IK  
CC  
CC  
I
Input current at maximum input  
voltage  
I
V
= MAX, V = 7.0V  
0.1  
mA  
I
I
I
High-level input current  
Low-level input current  
V
CC  
V
CC  
V
CC  
V
CC  
= MAX, V = 2.7V  
20  
–0.1  
–112  
7
µA  
mA  
mA  
mA  
IH  
I
I
= MAX, V = 0.4V  
I
IL  
3
I
Output current  
= MAX, V = 2.25V  
–30  
O
O
I
Supply current (total)  
= MAX  
4
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 = 5V, T = 25°C.  
CC  
amb  
3. The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, I  
.
OS  
4
1996 Jul 03  
Philips Semiconductors  
Product specification  
1-of-8 decoder/demultiplexer  
74ALS138  
AC ELECTRICAL CHARACTERISTICS  
LIMITS  
T
V
= 0°C to +70°C  
= +5.0V ± 10%  
amb  
CC  
SYMBOL  
PARAMETER  
TEST CONDITION  
UNIT  
C = 50pF, R = 500Ω  
L
L
MIN  
MAX  
t
t
Propagation delay  
An to Qn  
3.0  
3.0  
22.0  
18.0  
PLH  
PHL  
Waveform 1, 2  
Waveform 2  
Waveform 1  
ns  
ns  
ns  
t
t
Propagation delay  
E1, E2 to Qn  
3.0  
3.0  
17.0  
17.0  
PLH  
PHL  
t
t
Propagation delay  
E2 to Qn  
3.0  
3.0  
17.0  
17.0  
PLH  
PHL  
AC WAVEFORMS  
For all waveforms, V = 1.3V.  
M
An, E2  
V
V
M
An, E0, E1  
V
V
M
M
M
t
t
t
t
PLH  
PHL  
PLH  
PHL  
V
V
V
V
M
M
M
M
Qn  
Qn  
SF00179  
SF00180  
Waveform 1. Propagation Delay for Inverting Outputs  
Waveform 2. Propagation Delay for Non-inverting Outputs  
TEST CIRCUIT AND WAVEFORMS  
t
w
AMP (V)  
0.3V  
V
CC  
90%  
90%  
NEGATIVE  
PULSE  
V
V
M
M
10%  
10%  
V
V
OUT  
IN  
PULSE  
GENERATOR  
D.U.T.  
t
t )  
f
t
t )  
THL ( f  
TLH ( r  
R
C
R
L
T
L
t
t )  
t
t )  
TLH ( r  
THL ( f  
AMP (V)  
0.3V  
90%  
M
90%  
POSITIVE  
PULSE  
V
V
M
Test Circuit for Totem-pole Outputs  
10%  
10%  
t
w
Input Pulse Definition  
DEFINITIONS:  
R
L
C
L
R
T
=
=
=
Load resistor;  
INPUT PULSE REQUIREMENTS  
V
see AC electrical characteristics for value.  
Load capacitance includes jig and probe capacitance;  
see AC electrical characteristics for value.  
Termination resistance should be equal to Z  
pulse generators.  
Family  
Rep.Rate  
t
w
t
t
THL  
Amplitude  
M
TLH  
2.0ns  
2.0ns  
of  
74ALS  
3.5V  
1.3V  
1MHz  
500ns  
OUT  
SC00005  
5
1996 Jul 03  
Philips Semiconductors  
Product specification  
1-of-8 decoder/demultiplexer  
74ALS138  
DIP16: plastic dual in-line package; 16 leads (300 mil)  
SOT38-4  
6
1996 Jul 03  
Philips Semiconductors  
Product specification  
1-of-8 decoder/demultiplexer  
74ALS138  
SO16: plastic small outline package; 16 leads; body width 3.9 mm  
SOT109-1  
7
1996 Jul 03  
Philips Semiconductors  
Product specification  
1-of-8 decoder/demultiplexer  
74ALS138  
DEFINITIONS  
Data Sheet Identification  
Product Status  
Definition  
This data sheet contains the design target or goal specifications for product development. Specifications  
may change in any manner without notice.  
Objective Specification  
Formative or in Design  
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.  
Preliminary Specification  
Product Specification  
Preproduction Product  
Full Production  
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.  
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. PhilipsSemiconductorsmakesnorepresentationorwarrantythatsuchapplicationswillbesuitableforthespecifiedusewithoutfurthertesting  
or modification.  
LIFE SUPPORT APPLICATIONS  
Philips Semiconductors and Philips Electronics North America Corporation Products are not designed for use in life support appliances, devices,  
orsystemswheremalfunctionofaPhilipsSemiconductorsandPhilipsElectronicsNorthAmericaCorporationProductcanreasonablybeexpected  
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  
Copyright Philips Electronics North America Corporation 1997  
All rights reserved. Printed in U.S.A.  
Sunnyvale, California 94088–3409  
Telephone 800-234-7381  
Philips  
Semiconductors  

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