74F538 View Datasheet(PDF) - Philips Electronics
Part Name
Description
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74F538 Datasheet PDF : 10 Pages
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Philips Semiconductors
1-of-8 decoder (3-State)
Product specification
74F538
DESCRIPTION
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 (OEn) inputs will
force all outputs to the high impedance state. Two active High (E2,
E3) and two active Low (E0, 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
74F538
8.5ns
TYPICAL SUPPLY
CURRENT
(TOTAL)
35mA
PIN CONFIGURATION
Q2 1
Q1 2
Q0 3
OE0 4
OE1 5
A0 6
A1 7
Q5 8
Q6 9
GND 10
20 VCC
19 Q3
18 Q4
17 A2
16 E0
15 E1
14 E2
13 E3
12 P
11 Q7
ORDERING INFORMATION
DESCRIPTION
COMMERCIAL RANGE
VCC = 5V ±10%,
Tamb = 0°C to +70°C
PKG DWG #
20-Pin Plastic DIP
N74F538N
SOT146-1
20-Pin Plastic SOL
N74F538D
SOT163-1
SF00996
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS
DESCRIPTION
74F(U.L.)
HIGH/LOW
A0 - A2
Address inputs
1.0/1.0
E0, E1
Enable inputs (active Low)
1.0/1.0
E2, E3
Enable inputs (active High)
1.0/1.0
P
Polarity control input
1.0/1.0
OE0, OE1
Output Enable inputs
1.0/1.0
Q0 - Q7
Data outputs
NOTE: One (1.0) FAST Unit Load is defined as: 20µA in the High state and 0.6mA in the Low state.
150/40
LOAD VALUE
HIGH/LOW
20µA/0.6mA
20µA/0.6mA
20µA/0.6mA
20µA/0.6mA
20µA/0.6mA
3.0mA/24mA
LOGIC SYMBOL
6 7 17
12
P
16
E0
15
E1
A0 A1 A2
14
E2
13
E3
4
OE0
5
OE1
Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7
VCC = Pin 20
GND = Pin 10
3 2 1 19 18 8 9 11
SF00997
LOGIC SYMBOL (IEEE/IEC)
DMUX
4
N8
5
& EN
0,8
3
2
6
1,8
7
17
0
2
G
0
7
2,8
3,8
1
19
13
&
14
15
16
18
4,8
8
5,8
6,8
9
7,8
11
SF00998
1989 Apr 06
2
853–1273 96267
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