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MC74F257A QUAD 2-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS
The MC74F257 is a quad 2-input multiplexer ...
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MC74F257A 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 common 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 16 OE 15 I0c 14 I1c 13 Zc 12 I0d 11 I1d 10 Zd 9
16 1
QUAD 2-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS
FAST™
SCHOTTKY TTL
J SUFFIX CERAMIC CASE 620-09
16
N SUFFIX PLASTIC CASE 648-08
1
1 S
2 I0a
3 I1a
4 Za
5 I0b
6 I1b
7 Zb
8 GND
LOGIC DIAGRAM
OE I0a I1a I0b I1b I0c I1c I0d I1d S
16 1
D SUFFIX SOIC CASE 751B-03
ORDERING INFORMATION
MC54FXXXAJ Ceramic MC74FXXXAN Plastic MC74FXXXAD SOIC
LOGIC SYMBOL
1
Za
Zb
Zc
Zd 4 Za Zb Zc Zd
S OE I0a I1a I0b I1b I0c I1c I0d I1d 15 2 3 5 6 14 13 11 10
FUNCTION TABLE
Output Enable OE H L L L L Select Input S X H H L L Data Inputs I0 X X X L H I1 X L H X X Outputs Z Z L H L H
H = HIGH Voltage Level L = LOW Voltage Level X = Don’t Care Z = High Impedance
7 12
9 VCC = PIN 16 GND = PIN 8
FAST AND LS TTL DATA 4-127
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MC74F257A
GUAR...