CY74FCT257T Texas instruments

CY74FCT257T

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CY74FCT257T

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Описание

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.

Function, Pinout, and Drive Compatible With FCT and F Logic
Reduced V_OH (Typically = 3.3 V) Version of Equivalent FCT Functions
Edge-Rate Control Circuitry for Significantly Improved Noise Characteristics
I_off 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

Technology family	FCT
Function	Digital Multiplexer
Configuration	2:1
Number of channels	4
Operating temperature range (°C)	-40 to 85
Rating	Catalog