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Function, Pinout, and Drive Compatible

With FCT and F Logic

Reduced VOH (Typically = 3.3 V) Versions 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

ESD Protection Exceeds JESD 22

– 2000-V Human-Body Model (A114-A)

– 200-V Machine Model (A115-A)

– 1000-V Charged-Device Model (C101)

Fully Compatible With TTL Input and

Output Logic Levels

64-mA Output Sink Current

32-mA Output Source Current

description

The CY74FCT399T is a high-speed quad 2-input register that selects four bits of data from either of two sources

(ports) under control of a common select (S) input. Selected data are transferred to a 4-bit output register

synchronous with the low-to-high transition of the clock (CP) input. The 4-bit D-type output register is fully edge

triggered. The data inputs (I0X, I1X) and S input must be stable only one setup time prior to, and hold time after,

the low-to-high transition of CP for predictable operation. The CY74FCT399T has noninverted outputs.

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.