CY74FCT257CTSOC ,Quadruple 1-of-2 Data Selectors/Multiplexers with 3-State Outputsmaximum ratings ifoutputs are tied together. OE inputs must ensure that there is no overlap when ou ..
CY74FCT257TQCT ,Quadruple 1-of-2 Data Selectors/Multiplexers with 3-State OutputsCY74FCT257TQUAD 2-INPUT MULTIPLEXERWITH 3-STATE OUTPUTSSCCS019D − MAY 1994 − REVISED NOVEMBER 2001Q ..
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CY74FCT257CTSOC-CY74FCT257TQCT
Quadruple 1-of-2 Data Selectors/Multiplexers with 3-State Outputs
CY74FCT257T
QUAD 2-INPUT MULTIPLEXER
WITH 3-STATE OUTPUTS
SCCS019D − MAY 1994 − REVISED NOVEMBER 2001
Function, Pinout, and Drive Compatible
With FCT and F Logic Reduced VOH (Typically = 3.3 V) Version of
Equivalent FCT Functions Edge-Rate Control Circuitry for
Significantly Improved Noise
Characteristics Ioff Supports Partial-Power-Down Mode
Operation Matched Rise and Fall Times Fully Compatible With TTL Input and
Output Logic Levels ESD Protection Exceeds JESD 22
− 2000-V Human-Body Model (A114-A)
− 200-V Machine Model (A115-A)
− 1000-V Charged-Device Model (C101) 64-mA Output Sink Current
32-mA Output Source Current 3-State Outputs
descriptionThe 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.
PIN DESCRIPTIONPlease 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.
I0a
I1a
I0b
I1b
GND
VCC
I0c
I1c
I0d
I1d
Q OR SO PACKAGE
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