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Function and Pinout Compatible With FCT

and F Logic

25-Ω Output Series Resistors to Reduce

Transmission-Line Reflection Noise

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)

3-State Outputs

12-mA Output Sink Current

15-mA Output Source Current

Edge-Triggered D-Type Inputs

250-MHz Typical Switching Rate

description

The CY74FCT2574T is a high-speed, low-power, octal D-type flip-flop featuring separate D-type inputs for each

flip-flop. On-chip termination resistors at the outputs reduce system noise caused by reflections. The

CY74FCT2574T can replace the CY74FCT574T to reduce noise in an existing design. This device has 3-state

outputs for bus-oriented applications. A buffered clock (CP) and output-enable (OE) inputs are common to all

flip-flops. The CY74FCT2574T is identical to the CY74FCT2374T, except that on the CY74FCT2574T all

outputs are on one side of the package and all inputs are on the other side. The flip-flops in the CY74FCT2574T

store the state of their individual D inputs that meet the setup-time and hold-time requirements on the low-to-high

CP transition. When OE is low, the contents of the flip-flops are available at the outputs. When OE is high, the

outputs are in the high-impedance state. The state of OE does not affect the state of the flip-flops.

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.