Philips 74als139 DATASHEETS
INTEGRATED CIRCUITS
74ALS139
Dual 1-of-4 decoder/demultiplexer
Product specification 1991 Feb 08
IC05 Data Handbook
Philips Semiconductors Product specification
74ALS139Dual 1-of-4 decoder/demultiplexer
FEA TURES
•Demultiplexing capability
•Two independent 1-of-4 decoders
•Multi-function capability
DESCRIPTION
The 74ALS139 is a dual 1-of-4 decoder/demultiplexer. This device
has two independent decoders, each accepting two binary weighted
inputs (A
outputs (Q
When E
used as the data input for a 1-of-4 demultiplexer application.
ORDERING INFORMATION
, A1n) and providing four mutually exclusive active-Low
0n
0n–Q3n). Each decoder has an active-Low enable (E).
is High, every output is forced High. The enable can be
TYPE
TYPICAL
PROPAGATION DELAY
TYPICAL
SUPPLY CURRENT
(TOTAL)
74ALS139 6.0ns 4mA
ORDER CODE
DESCRIPTION COMMERCIAL RANGE
V
= 5V ±10%,
CC
T
= 0°C to +70°C
amb
DRAWING
NUMBER
16-pin plastic DIP 74ALS139N SOT38-4
16-pin plastic SO 74ALS139D SOT109-1
PIN CONFIGURATION
E
1
a
2
A0a
A1a
3
Q
4
0a
5
Q
1a
6
2a
Q
3a
Q
16
V
15
E
A0b
14
13
A1b
12
Q0b
11
Q1b
107
Q2b
98GND Q3b
CC
b
SF00129
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS DESCRIPTION
A0n, A1n Address inputs 1.0/1.0 20µA/0.1mA
Ea, Eb Enable inputs (active-Low) 1.0/1.0 20µA/0.1mA
Q0n, Q1n Data outputs 20/80 0.4mA/8mA
NOTE: One (1.0) ALS unit load is defined as: 20µA in the High state and 0.1mA in the Low state.
LOGIC SYMBOL
123
DECODER a DECODER b
Q0a Q1a Q2a
456
V
= Pin 16
CC
GND = Pin 8
15 14 13
A0a A1aEa
Q3a
7
Q0b Q1b Q2b
12 11 10
A0b A1bEb
Q3b
9
SF00130
IEC/IEEE SYMBOL
74ALS (U.L.)
HIGH/LOW
2
3
1
14
13
15
0
1
DEMUX
0
G
3
0
1
2
3
LOAD VALUE
HIGH/LOW
4
5
6
7
12
11
10
9
SF00131
1991 Feb 08 853–1426 01670
2
Philips Semiconductors Product specification
SYMBOL
PARAMETER
UNIT
74ALS139Dual 1-of-4 decoder/demultiplexer
LOGIC DIAGRAM
E
a A0a A1a
123
E
b A0b A1b
15 14 13
FUNCTION TABLE
INPUTS OUTPUTS
E A0 A1 Q0 Q1 Q2 Q3
H X X H H H H
L L LLHHH
LHLHLHH
LLHHHLH
LHHHHHL
H = High voltage level
L = Low voltage level
X = Don’t care
4567
0a Q1a Q2a Q3a
Q
V
= Pin 16
CC
GND = Pin 8
12 11 10 9
0b Q1b Q2b Q3b
Q
SF00132
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
CC
V
IN
I
IN
V
OUT
I
OUT
T
amb
T
stg
Supply voltage –0.5 to +7.0 V
Input voltage –0.5 to +7.0 V
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
PARAMETER RATING UNIT
CC
V
RECOMMENDED OPERATING CONDITIONS
V
V
V
I
I
OH
I
OL
T
amb
1991 Feb 08
Supply voltage 4.5 5.0 5.5 V
CC
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
LIMITS
MIN NOM MAX
3
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