Function, Pinout, and Drive Compatible
With FCT, F Logic, and AM29821
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
High-Speed Parallel Register With
Positive-Edge-Triggered D-Type Flip-Flops
3-State Outputs

description
This bus-interface register is designed to eliminate the extra packages required to buffer existing registers and
provide extra data width for wider address/data paths or buses carrying parity. The CY74FCT821T is a
10-bit-wide buffered version of the popular CY74FCT374 function. This device is ideal for use as an output port
requiring high IOL/IOH.
This device is designed for high-capacitance load drive capability, while providing low-capacitance bus loading
at both inputs and outputs. Outputs are designed for low-capacitance bus loading in the high-impedance state.
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.