HD74HC257
Quad. 2-to-1-line Data Selectors/Multiplexers
(with noninverted 3-state outputs)
REJ03D0601–0200
(Previous ADE-205-478)
Rev.2.00
Jan 31, 2006
Description
The large output drive capability coupled with the 3-state feature make this device ideal for interfacing with bus lines in
a bus organized system. When the output control input line is taken high, the outputs of all four multiplexers are sent
into a high impedance state. When the output control line is low, the select input chooses whether the A or B input is
used.
Features
•
•
•
•
•
•
High Speed Operation: t
pd
(Data to Y) = 10.5 ns typ (C
L
= 50 pF)
High Output Current: Fanout of 15 LSTTL Loads
Wide Operating Voltage: V
CC
= 2 to 6 V
Low Input Current: 1 µA max
Low Quiescent Supply Current: I
CC
(static) = 4 µA max (Ta = 25°C)
Ordering Information
Part Name
HD74HC257P
HD74HC257FPEL
HD74HC257RPEL
Package Type
DILP-16 pin
SOP-16 pin (JEITA)
SOP-16 pin (JEDEC)
Package Code
(Previous Code)
PRDP0016AE-B
(DP-16FV)
PRSP0016DH-B
(FP-16DAV)
Package
Abbreviation
P
FP
—
EL (2,000 pcs/reel)
EL (2,500 pcs/reel)
Taping Abbreviation
(Quantity)
PRSP0016DG-A
RP
(FP-16DNV)
Note: Please consult the sales office for the above package availability.
Function Table
Inputs
Output Control
Select
L
L
L
L
L
H
L
H
H
X
Notes H: high level, L: low level, X: irrelevant
A
L
H
X
X
X
B
X
X
L
H
X
Output
Y
L
H
L
H
High impedance
Rev.2.00 Jan 31, 2006 page 1 of 7