Philips 74f538 DATASHEETS
INTEGRATED CIRCUITS
74F538
1-of -8 decoder (3–state)
Product specification
IC15 Data Handbook
1989 Apr 06
Philips Semiconductors Product specification
74F5381-of-8 decoder (3-State)
DESCRIPTION
PIN CONFIGURATION
The 74F538 decoder/demultiplexer accepts three address (A0 - A2)
input signals and decodes them to select one of eight mutually
exclusive outputs. A Polarity control (P) input determines whether
the outputs are active Low or active High. The 74F538 has 3-State
outputs, and a High signal on the Output Enables (OE
n) inputs will
force all outputs to the high impedance state. Two active High (E2,
E3) and two active Low (E
0, E1) inputs are available for easy
expansion to 1-of-32 decoding with four packages, or for data
demultiplexing to 1-of-8 or 1-of-16 destinations.
TYPE
TYPICAL
PROPAGATION DELAY
TYPICAL SUPPL Y
CURRENT
(TOTAL)
74F538 8.5ns 35mA
ORDERING INFORMATION
Q2
1
Q1
2
Q0
3
0
OE
4
OE1
5
A0
6
A1
7
Q5
8
Q6
9
GND
10 11
20
19
18
17
16
15
14
13
12
SF00996
V
Q3
Q4
A2
E
E1
E2
E3
P
Q7
CC
0
COMMERCIAL RANGE
DESCRIPTION
VCC = 5V ±10%,
T
= 0°C to +70°C
amb
PKG DWG #
20-Pin Plastic DIP N74F538N SOT146-1
20-Pin Plastic SOL N74F538D SOT163-1
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS DESCRIPTION
74F(U.L.)
HIGH/LOW
A0 - A2 Address inputs 1.0/1.0 20µA/0.6mA
E0, E1 Enable inputs (active Low) 1.0/1.0 20µA/0.6mA
E2, E3 Enable inputs (active High) 1.0/1.0 20µA/0.6mA
P Polarity control input 1.0/1.0 20µA/0.6mA
OE0, OE1 Output Enable inputs 1.0/1.0 20µA/0.6mA
Q0 - Q7 Data outputs 150/40 3.0mA/24mA
NOTE: One (1.0) FAST Unit Load is defined as: 20µA in the High state and 0.6mA in the Low state.
LOAD VALUE
HIGH/LOW
LOGIC SYMBOL
6717
P
12
E0
16
E1
15
14
E2
13
E3
4
OE0
5
OE1
Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7
= Pin 20
V
CC
GND = Pin 10
1989 Apr 06 853–1273 96267
A0 A1 A2
32119188911
SF00997
LOGIC SYMBOL (IEEE/IEC)
4
5
6
7
17
13
14
15
16
2
DMUX
N8
&
EN
0,8
0
G
2
&
1,8
0
2,8
7
3,8
4,8
5,8
6,8
7,8
3
2
1
19
18
8
9
11
SF00998
Philips Semiconductors Product specification
OPERATING MODE
Active High out ut
Active Low out ut
74F5381-of-8 decoder (3-State)
LOGIC DIAGRAM
17
A2
7
A1
6
A0
16
0
E
15
E
1
14
E2
13
E3
12
P
4
OE0
32119188911
Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7
V
= Pin 20
CC
GND = Pin 10
OE
5
1
FUNCTION TABLE
INPUTS OUTPUTS
OE0OE1E0E1E2E3A2A1A0Q0Q1Q2 Q3 Q4 Q5 Q6 Q7
HXXHXXXXXXXXXXXXXXZZZZZZZZZZZZZZZ
L
L
H
X
X
X
X
X
L
L
X
H
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
X
L
X
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
L
X
X
L
X
X
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
H = High voltage level
L = Low voltage level
X = Don’t care
Z = High impedance “off” state
X
X
X
X
L
X
H
L
H
L
H
L
H
L
H
H
H
H
H
H
H
H
H
L
H
L
H
L
H
L
H
H
H
H
H
H
H
H
X
X
X
X
X
X
X
L
L
L
H
H
L
L
H
H
L
L
H
H
L
L
H
H
H
H
L
L
L
H
L
L
L
H
L
L
L
H
L
L
L
H
H
L
H
H
H
L
H
H
H
L
H
H
H
Outputs equal P input Disable
L
L
L
L
L
H
L
L
L
H
L
L
L
L
L
L
L
L
L
L
H
H
L
H
H
L
H
H
H
H
H
H
H
H
H
H
L
L
L
H
L
L
H
L
L
L
L
L
L
H
H
H
H
H
H
L
H
H
L
H
H
H
H
H
H
L
L
L
L
L
L
L
L
L
H
L
L
H
L
L
H
H
H
H
H
H
H
H
H
H
L
H
H
L
H
H
Z
L
L
L
L
L
L
L
H
H
H
H
H
H
H
H
L
SF00999
High Impedance
Active High output
(P = L)
Active Low output
(P = H)
1989 Apr 06
3
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