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Function, Pinout, and Drive Compatible

With FCT, F Logic, and AM29520

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)

Single- and Dual-Pipeline Operation Modes

Multiplexed Data Inputs and Outputs

CY29FCT520T

– 64-mA Output Sink Current

32-mA Output Source Current

CY29FCT520ATDMB, CY29FCT520BTDMB

– 32-mA Output Sink Current

12-mA Output Source Current

3-State Outputs

description

The CY29FCT520T is a multilevel 8-bit-wide pipeline register. The device consists of four registers, A1, A2, B1,

and B2, which are configured by the instruction inputs I0, I1 as a single four-level pipeline or as two two-level

pipelines. The contents of any register can be read at the multiplexed output at any time by using the

multiplex-selection controls (S0 and S1).

The pipeline registers are positive-edge triggered, and data is shifted by the rising edge of the clock input.

Instruction I = 0 selects the four-level pipeline mode. Instruction I = 1 selects the two-level B pipeline, while I = 2

selects the two-level A pipeline. I = 3 is the hold instruction; no shifting is performed by the clock in this mode.

In the two-level operation mode, data is shifted from level 1 to level 2 and new data is loaded into level 1.

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.