MC74F257AD Motorola, MC74F257AD Datasheet
MC74F257AD
Manufacturer Part Number
MC74F257AD
Description
Quad 2-input multiplexer with 3-state outputs
Manufacturer
Motorola
Datasheet
1.MC74F257AD.pdf
(3 pages)
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QUAD 2-INPUT MULTIPLEXER
WITH 3-STATE OUTPUTS
of data from two sources can be selected using a common Data Select input.
The four outputs present the selected data in true (non-inverted) form. The
outputs may be switched to a high impedance state with a HIGH on the com-
mon Output Enable (OE) input, allowing the outputs to interface directly with
bus oriented systems.
The MC74F257 is a quad 2-input multiplexer with 3-state outputs. Four bits
Multiplexer Expansion by Tying Outputs Together
Non-Inverting 3-State Outputs
Input Clamp Diodes Limit High-Speed Termination Effects
AC Enhanced Version of the F257
FUNCTION TABLE
Output
Enable
OE
OE
H
L
L
L
L
V CC
16
1
S
I 0a
Select
Input
S
X
H
H
Z a
L
L
OE
15
I 0a
2
I 1a
CONNECTION DIAGRAM
14
I 0c
I 1a
3
I 0b
I 0
X
X
X
H
L
LOGIC DIAGRAM
Inputs
Data
I 1c
13
Z a
4
Z b
I 1b
I 1
X
H
X
X
L
12
I 0b
Z c
5
I 0c
Outputs
I 0d
I 1b
11
6
H
H
Z
Z
L
L
Z c
FAST AND LS TTL DATA
I 1c
10
I 1d
Z b
7
H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
Z = High Impedance
GND
I 0d
Z d
9
8
4-127
Z d
I 1d
S
V CC = PIN 16
GND = PIN 8
QUAD 2-INPUT MULTIPLEXER
16
16
WITH 3-STATE OUTPUTS
16
ORDERING INFORMATION
1
1
MC74F257A
FAST
MC54FXXXAJ Ceramic
MC74FXXXAN Plastic
MC74FXXXAD SOIC
1
LOGIC SYMBOL
12
4
7
9
SCHOTTKY TTL
Z a
Z b
Z c
Z d
CASE 751B-03
S
1
CASE 620-09
CASE 648-08
CERAMIC
N SUFFIX
D SUFFIX
J SUFFIX
PLASTIC
SOIC
OE
I 0a
I 1a
I 0b
I 1b
I 0c
I 1c
I 0d
I 1d
15
14
13
11
10
2
3
5
6
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MC74F257AD Summary of contents
Page 1
QUAD 2-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS The MC74F257 is a quad 2-input multiplexer with 3-state outputs. Four bits of data from two sources can be selected using a common Data Select input. The four outputs present the selected data in ...
Page 2
GUARANTEED OPERATING RANGES Symbol Parameter V CC Supply Voltage T A Operating Ambient Temperature Range I OH Output Current — High I OL Output Current — Low DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified) Symbol Parameter V IH ...
Page 3
AC CHARACTERISTICS Symbol Parameter t PLH Propagation Delay t PHL PLH Propagation Delay t PHL PZH Output Enable Time t PZL t PHZ Output Disable Time t PLZ MC74F257A ...