CY74FCT257T Datasheet, PDF (2/12 Pages) Texas Instruments – QUAD 2-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS

CY74FCT257T
QUAD 2-INPUT MULTIPLEXER
WITH 3-STATE OUTPUTS
SCCS019D – MAY 1994 – REVISED NOVEMBER 2001
ORDERING INFORMATION
TA
PACKAGE^†
SPEED
(ns)
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
QSOP – Q Tape and reel
4.3
CY74FCT257CTQCT FT257-3
Tube
4.3
CY74FCT257CTSOC
SOIC – SO
FCT257C
–40°C to 85°C
Tape and reel
4.3
CY74FCT257CTSOCT
QSOP – Q Tape and reel
5
CY74FCT257ATQCT FT257-1
QSOP – Q Tape and reel
6
CY74FCT257TQCT
FT257
† _{Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines}
are available at www.ti.com/sc/package.
FUNCTION TABLE
INPUTS
OUTPUT
OE
S
I0
I1
Y
H
X
X
X
Z
L
H
X
L
L
L
H
X
H
H
L
L
L
X
L
L
L
H
X
H
H = High logic level, L = Low logic level,
X = Don’t care, Z = High-impedance state
logic diagram
15
OE
S1
I0a ²
I1a ³
4 _Ya
I0b ⁵
I1b ⁶
7 _Yb
I0c ¹⁴
13
I1c
I0d ¹¹
I1d ¹⁰
12 _Yc
9
Yd
2
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