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MC74F257AJ View Datasheet(PDF) - Motorola => Freescale

Part NameDescriptionManufacturer
MC74F257AJ QUAD 2-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS Motorola
Motorola => Freescale Motorola
MC74F257AJ Datasheet PDF : 3 Pages
1 2 3
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 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.
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
CONNECTION DIAGRAM
VCC OE I0c I1c Zc I0d I1d Zd
16 15 14 13 12 11 10 9
MC74F257A
QUAD 2-INPUT MULTIPLEXER
WITH 3-STATE OUTPUTS
FASTSCHOTTKY TTL
16
1
J SUFFIX
CERAMIC
CASE 620-09
12345678
S I0a I1a Za I0b I1b Zb GND
LOGIC DIAGRAM
OE
I0a I1a I0b I1b I0c
I1c I0d I1d S
16
1
N SUFFIX
PLASTIC
CASE 648-08
16
1
D SUFFIX
SOIC
CASE 751B-03
ORDERING INFORMATION
MC54FXXXAJ Ceramic
MC74FXXXAN Plastic
MC74FXXXAD SOIC
Za
Zb
FUNCTION TABLE
Output
Enable
Select
Input
OE
S
H
X
L
H
L
H
L
L
L
L
Data
Inputs
I0
I1
X
X
X
L
X
H
L
X
H
X
Zc
Zd
Outputs
Z
Z
L
H
L
H
H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
Z = High Impedance
FAST AND LS TTL DATA
4-127
LOGIC SYMBOL
1
S
OE
15
4
Za
I0a
2
I1a
3
7
Zb
12
Zc
I0b
5
I1b
6
I0c
14
9
Zd
VCC = PIN 16
GND = PIN 8
I1c
13
I0d
11
I1d
10
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