2-INPUT MULTIPLEXER. CY74FCT2257T Datasheet

CY74FCT2257T MULTIPLEXER. Datasheet pdf. Equivalent

CY74FCT2257T Datasheet
Recommendation CY74FCT2257T Datasheet
Part CY74FCT2257T
Description QUAD 2-INPUT MULTIPLEXER
Feature CY74FCT2257T; D Function and Pinout Compatible With FCT and F Logic D 25-Ω Output Series Resistors to Reduce Trans.
Manufacture etcTI
Datasheet
Download CY74FCT2257T Datasheet




Texas Instruments CY74FCT2257T
D Function and Pinout Compatible With FCT
and F Logic
D 25-Output Series Resistors to Reduce
Transmission-Line Reflection Noise
D TTL Output Level Versions of Equivalent
FCT Functions
D Edge-Rate Control Circuitry for
Significantly Improved Noise
Characteristics
D Ioff Supports Partial-Power-Down Mode
Operation
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 12-mA Output Sink Current
15-mA Output Source Current
D 3-State Outputs
CY74FCT2257T
QUAD 2-INPUT MULTIPLEXER
WITH 3-STATE OUTPUTS
SCCS038B – SEPTEMBER 1994 – REVISED OCTOBER 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 CY74FCT2257T 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 appears at the output in noninverted form for the CY74FCT2257T. On-chip
termination resistors at the outputs reduce system noise caused by reflections. The CY74FCT2257T can
replace the FCT257T to reduce noise in an existing design.
The CY74FCT2257T is a logic implementation of a four-pole, two-position switch, in which the position of the
switch is determined by the logic levels supplied to S. Outputs are forced to the high-impedance off state when
the output-enable (OE) input is high.
All but one device must be in the high-impedance state to prevent currents from exceeding the maximum ratings
if outputs are tied together. Design of the OE signals 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



Texas Instruments CY74FCT2257T
CY74FCT2257T
QUAD 2-INPUT MULTIPLEXER
WITH 3-STATE OUTPUTS
SCCS038B SEPTEMBER 1994 REVISED OCTOBER 2001
ORDERING INFORMATION
TA
PACKAGE
SPEED
(ns)
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
QSOP Q Tape and reel
4.3
CY74FCT2257CTQCT
FR257-3
40°C to 85°C SOIC SO
Tube
Tape and reel
4.3
4.3
CY74FCT2257CTSOC
CY74FCT2257CTSOCT
FCT2257C
QSOP Q Tape and reel
5
CY74FCT2257ATQCT
FR257-1
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 = Dont
care, Z = High-impedance (off) state
logic diagram (positive logic)
OE 15
S1
I0a 2
3
I1a
I0b 5
6
I1b
I0c 14
13
I1c
I0d 11
10
I1d
4 Ya
7 Yb
12 Yc
9 Yd
2 POST OFFICE BOX 655303 DALLAS, TEXAS 75265



Texas Instruments CY74FCT2257T
CY74FCT2257T
QUAD 2-INPUT MULTIPLEXER
WITH 3-STATE OUTPUTS
SCCS038B SEPTEMBER 1994 REVISED OCTOBER 2001
absolute maximum rating over operating free-air temperature range (unless otherwise noted)
Supply voltage range to ground potential . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 V to 7 V
DC input voltage range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 V to 7 V
DC output voltage range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5 V to 7 V
DC output current (maximum sink current/pin) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120 mA
Package thermal impedance, θJA (see Note 1): Q package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90°C/W
SO package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57°C/W
Ambient temperature range with power applied, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65°C to 135°C
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65°C to 150°C
Stresses beyond those listed under absolute maximum ratingsmay cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditionsis not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES: 1. The package thermal impedance is calculated in accordance with JESD 51-7.
recommended operating conditions (see Note 2)
VCC Supply voltage
VIH High-level input voltage
VIL Low-level input voltage
IOH High-level output current
IOL Low-level output current
TA Operating free-air temperature
NOTE 2: All unused inputs of the device must be held at VCC or GND to ensure proper device operation.
MIN NOM
4.75 5
2
40
MAX
5.25
0.8
15
12
85
UNIT
V
V
V
mA
mA
°C
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
3







@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)