IN74ACT257
Q
UAD
2-I
NPUT
D
ATA
S
ELECTOR
/M
ULTIPLEXER
WITH
3-S
TATE
O
UTPUTS
High-Speed Silicon-Gate CMOS
The IN74ACT257 is identical in pinout to the LS/ALS257,
HC/HCT257. The IN74ACT257 may be used as a level converter for
interfacing TTL or NMOS outputs to High Speed CMOS inputs.
This device selects a (4-bit) nibble from either the A or B inputs as
determined by the Select input. The nibble is presented at the outputs
in noninverted from when the Output Enable pin is at a low level. A high
level on the Output Enable pin switches the outputs into the high-
impedance state.
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TTL/NMOS Compatible Input Levels
Outputs Directly Interface to CMOS, NMOS, and TTL
Operating Voltage Range: 4.5 to 5.5 V
Low Input Current: 1.0
碌A(chǔ);
0.1
碌A(chǔ)
@ 25擄C
Outputs Source/Sink 24 mA
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鈥?/div>
鈥?/div>
鈥?/div>
ORDERING INFORMATION
IN74ACT257N Plastic
IN74ACT257D SOIC
T
A
= -40擄 to 85擄 C for all
packages
PIN ASSIGNMENT
LOGIC DIAGRAM
PIN 16 =V
CC
PIN 8 = GND
FUNCTION TABLE
Inputs
Outputs
Output
Select
Y0-Y3
Enable
H
X
Z
L
L
A0-A3
L
H
B0-B3
X=don鈥檛
care
Z
=
high-impedance
state
A0-A3,B0-B3=the
levels
of
the
respective Nibble Inputs
1
IN74ACT257相關(guān)型號PDF文件下載
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