CY74FCT2257T Series

Quadruple 1-of-2 Data Selectors/Multiplexers with 3-State Outputs and Series Damping Resistors

Catalog

Quadruple 1-of-2 Data Selectors/Multiplexers with 3-State Outputs and Series Damping Resistors

Part	Operating Temperature [Max]	Operating Temperature [Min]	Current - Output High, Low [custom]	Current - Output High, Low [custom]	Independent Circuits	Package / Case [x]	Package / Case	Package / Case [y]	Mounting Type	Type	Supplier Device Package	Voltage - Supply [Min]	Voltage - Supply [Max]	Circuit [custom]	Circuit [custom]	Voltage Supply Source	Package / Case	Package / Case
Texas Instruments CY74FCT2257CTSOC	85 °C	-40 °C	15 mA	12 mA	1	0.295 in	16-SOIC	7.5 mm	Surface Mount	Multiplexer	16-SOIC	4.75 V	5.25 V	4	2:1	Single Supply
Texas Instruments CY74FCT2257CTQCT	85 °C	-40 °C	15 mA	12 mA	1		16-SSOP		Surface Mount	Multiplexer	16-SSOP	4.75 V	5.25 V	4	2:1	Single Supply	0.154 in	3.9 mm
Texas Instruments CY74FCT2257CTQC	85 °C	-40 °C	15 mA	12 mA	1		16-SSOP		Surface Mount	Multiplexer	16-SSOP	4.75 V	5.25 V	4	2:1	Single Supply	0.154 in	3.9 mm
Texas Instruments CY74FCT2257ATQC
Texas Instruments CY74FCT2257CTSOCT	85 °C	-40 °C	15 mA	12 mA	1	0.295 in	16-SOIC	7.5 mm	Surface Mount	Multiplexer	16-SOIC	4.75 V	5.25 V	4	2:1	Single Supply
Texas Instruments CY74FCT2257ATQCT	85 °C	-40 °C	15 mA	12 mA	1		16-SSOP		Surface Mount	Multiplexer	16-SSOP	4.75 V	5.25 V	4	2:1	Single Supply	0.154 in	3.9 mm

Catalog

Quadruple 1-of-2 Data Selectors/Multiplexers with 3-State Outputs and Series Damping Resistors

Key Features

• Function and Pinout Compatible With FCT and F Logic25-Output Series Resistors to Reduce Transmission-Line Reflection NoiseTTL Output Level Versions of Equivalent FCT FunctionsEdge-Rate Control Circuitry for Significantly Improved Noise CharacteristicsIoffSupports Partial-Power-Down Mode OperationFully Compatible With TTL Input and Output Logic LevelsESD Protection Exceeds JESD 222000-V Human-Body Model (A114-A)200-V Machine Model (A115-A)1000-V Charged-Device Model (C101)12-mA Output Sink Current15-mA Output Source Current3-State OutputsFunction and Pinout Compatible With FCT and F Logic25-Output Series Resistors to Reduce Transmission-Line Reflection NoiseTTL Output Level Versions of Equivalent FCT FunctionsEdge-Rate Control Circuitry for Significantly Improved Noise CharacteristicsIoffSupports Partial-Power-Down Mode OperationFully Compatible With TTL Input and Output Logic LevelsESD Protection Exceeds JESD 222000-V Human-Body Model (A114-A)200-V Machine Model (A115-A)1000-V Charged-Device Model (C101)12-mA Output Sink Current15-mA Output Source Current3-State Outputs

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 I0inputs are selected when S is low, and the I1inputs 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 Ioffcircuitry disables the outputs, preventing damaging current backflow through the device when it is powered down. 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 I0inputs are selected when S is low, and the I1inputs 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 Ioffcircuitry disables the outputs, preventing damaging current backflow through the device when it is powered down.