SN74LS139N 查看數據表（PDF） - Motorola => Freescale
零件编号
产品描述 (功能)
生产厂家
SN74LS139N Datasheet PDF : 5 Pages
| |||
SN54 / 74LS139
FUNCTIONAL DESCRIPTION
The LS139 is a high speed dual 1-of-4 decoder/demultiplex-
er fabricated with the Schottky barrier diode process. The
device has two independent decoders, each of which accept
two binary weighted inputs (A0, A1) and provide four mutually
exclusive active LOW outputs (O0 – O3). Each decoder has an
active LOW Enable (E). When E is HIGH all outputs are forced
HIGH. The enable can be used as the data input for a 4-output
demultiplexer application.
Each half of the LS139 generates all four minterms of two
variables. These four minterms are useful in some applica-
tions, replacing multiple gate functions as shown in Fig. a, and
thereby reducing the number of packages required in a logic
network.
TRUTH TABLE
INPUTS
OUTPUTS
E A0 A1 O0 O1 O2 O3
H
X
X
H
H
H
H
L
L
L
L
H
H
H
L
H
L
H
L
H
H
L
L
H
H
H
L
H
L
H
H
H
H
H
L
H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
E
E
A0
O0 A0
O0
A1
A1
E
E
A0
O1 A0
O1
A1
A1
E
E
A0
O2 A0
O2
A1
A1
E
E
A0
O3 A0
O3
A1
A1
Figure a
GUARANTEED OPERATING RANGES
Symbol
Parameter
VCC
Supply Voltage
TA
Operating Ambient Temperature Range
IOH
Output Current — High
IOL
Output Current — Low
Min
Typ
Max
Unit
54
4.5
5.0
5.5
V
74
4.75
5.0
5.25
54
– 55
25
125
°C
74
0
25
70
54, 74
– 0.4
mA
54
4.0
mA
74
8.0
FAST AND LS TTL DATA
5-236
Share Link: 