SN74ALS992DW集成电路（IC）的锁存器规格书PDF中文资料

SN74ALS992DW属于集成电路（IC）的锁存器。由美国德州仪器公司制造生产的SN74ALS992DW锁存器锁存器是类似于触发器的基本数字存储设备，但是不同之处在于，在锁存使能（或类似命名）信号处于有效逻辑状态的任何时间，保持的逻辑状态都可以改变。“透明”锁存器还允许设备输出在锁存使能信号有效时反映输入的当前状态，而相反的是，状态仅在保持状态已固定时改变。

3-State I/O-Type Read-Back Inputs

Bus-Structured Pinout

True Logic Outputs

Designed With Nine Bits for Parity

Applications

Package Options Include Plastic

Small-Outline (DW) Packages and Standard

Plastic (NT) 300-mil DIPs

description

This 9-bit latch is designed specifically for storing

the contents of the input data bus and providing

the capability of reading back the stored data onto

the input data bus. In addition, this device provides

a 3-state buffer-type output and is easily

implemented in parity applications.

The nine latches are transparent D-type latches. While the latch-enable (LE) input is high, the Q outputs follow

the data (D) inputs. The Q outputs are in the 3-state condition when the output-enable (OEQ) input is high.

Read back is provided through the output-enable (OERB) input. When OERB is taken low, the data present at

the output of the data latches is allowed to pass back onto the input data bus. When OERB is taken high, the

output of the data latches is isolated from the D inputs. OERB does not affect the internal operation of the latches;

however, precautions should be taken not to create a bus conflict.

The SN74ALS992 is characterized for operation from 0°C to 70°C.