74ALS138N [NXP]
1-of-8 decoder/demultiplexer; 1 - 8解码器/多路解复用器
| 型号： | 74ALS138N |
| 厂家： | 
NXP |
| 描述： | 1-of-8 decoder/demultiplexer |
| 文件： | 总8页 (文件大小：80K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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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