CY74FCT2573T屬于集成電路（IC）的鎖存器。由美國德州儀器公司制造生產(chǎn)的CY74FCT2573T鎖存器鎖存器是類似于觸發(fā)器的基本數(shù)字存儲設(shè)備，但是不同之處在于，在鎖存使能（或類似命名）信號處于有效邏輯狀態(tài)的任何時(shí)間，保持的邏輯狀態(tài)都可以改變?！巴该鳌辨i存器還允許設(shè)備輸出在鎖存使能信號有效時(shí)反映輸入的當(dāng)前狀態(tài)，而相反的是，狀態(tài)僅在保持狀態(tài)已固定時(shí)改變。

Function and Pinout Compatible With the

Fastest Bipolar Logic

25-Ω Output Series Resistors 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

3-State Outputs

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

12-mA Output Sink Current

15-mA Output Source Current

description

The CY74FCT2573T is an 8-bit, high-speed CMOS, TTL-compatible buffered latch with 3-state outputs that is

ideal for driving high-capacitance loads, such as memory and address buffers. On-chip 25-Ω termination

resistors at the outputs reduce system noise caused by reflections. The CY74FCT2573T can replace the

CY74FCT573T to reduce noise in an existing design.

When the latch-enable (LE) input is high, the flip-flops appear transparent to the data. Data that meets the

required setup times are latched when LE transitions from high to low. Data appears on the bus when the

output-enable (OE) input is low. When OE is high, the bus output is in the high-impedance state. In this mode,

data can be entered into the latches.

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.