2-INPUT MULTIPLEXER. CY74FCT257T Datasheet

CY74FCT257T MULTIPLEXER. Datasheet pdf. Equivalent

Part CY74FCT257T
Description QUAD 2-INPUT MULTIPLEXER
Feature D Function, Pinout, and Drive Compatible With FCT and F Logic D Reduced VOH (Typically = 3.3 V) Vers.
Manufacture etcTI
Total Page 21 Pages
Datasheet
Download CY74FCT257T Datasheet



CY74FCT257T
D Function, Pinout, and Drive Compatible
With FCT and F Logic
D Reduced VOH (Typically = 3.3 V) Version of
Equivalent FCT Functions
D Edge-Rate Control Circuitry for
Significantly Improved Noise
Characteristics
D Ioff Supports Partial-Power-Down Mode
Operation
D Matched Rise and Fall Times
D Fully Compatible With TTL Input and
Output Logic Levels
D ESD Protection Exceeds JESD 22
− 2000-V Human-Body Model (A114-A)
− 200-V Machine Model (A115-A)
− 1000-V Charged-Device Model (C101)
D 64-mA Output Sink Current
32-mA Output Source Current
D 3-State Outputs
CY74FCT257T
QUAD 2-INPUT MULTIPLEXER
WITH 3-STATE OUTPUTS
SCCS019D − MAY 1994 − REVISED NOVEMBER 2001
Q OR SO PACKAGE
(TOP VIEW)
S
I0a
I1a
Ya
I0b
I1b
Yb
GND
1
2
3
4
5
6
7
8
16 VCC
15 OE
14 I0c
13 I1c
12 Yc
11 I0d
10 I1d
9 Yd
description
The CY74FCT257T has four identical two-input multiplexers that select four bits of data from two sources under
the control of a common data-select (S) input. The I0 inputs are selected when S is low, and the I1 inputs are
selected when S is high. Data at the output is noninverted.
The CY74FCT257T is a logic implementation of a four-pole, two-position switch, where the position of the switch
is determined by the logic levels at S. Outputs are in the high-impedance state when the output-enable (OE)
input is high.
All but one device must be in the high-impedance state to avoid currents exceeding the maximum ratings if
outputs are tied together. OE inputs must ensure that there is no overlap when outputs of 3-state devices are
tied together.
This device is fully specified for partial-power-down applications using Ioff. The Ioff circuitry disables the outputs,
preventing damaging current backflow through the device when it is powered down.
NAME
I
S
OE
Y
PIN DESCRIPTION
DESCRIPTION
Data inputs
Common data-select input
Output-enable input (active low)
Data outputs
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
Copyright © 2001, Texas Instruments Incorporated
1



CY74FCT257T
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
OE S
HX
I0
X
OUTPUT
I1 Y
XZ
L HX L
L
LHXH
H
LLLX
L
L LHX
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
12 Yc
11
I0d
I1d 10
9
Yd
2 POST OFFICE BOX 655303 DALLAS, TEXAS 75265





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