SN74BCT573DW集成电路（IC）的锁存器规格书PDF中文资料

SN74BCT573DW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SN74BCT573DW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。

Operating Voltage Range of 4.5 V to 5.5 V

State-of-the-Art BiCMOS Design

Significantly Reduces ICCZ

Full Parallel Access for Loading

ESD Protection Exceeds JESD 22

− 2000-V Human-Body Model (A114-A)

− 200-V Machine Model (A115-A)

− 1000-V Charged-Device Model (C101)

description/ordering information

These 8-bit latches feature 3-state outputs designed specifically for driving highly capacitive or relatively

low-impedance loads. They are particularly suitable for implementing buffer registers, I/O ports, bidirectional

bus drivers, and working registers.

The eight latches of the ’BCT573 devices are transparent D-type latches. While the latch-enable (LE) input is

high, the Q outputs follow the data (D) inputs. When the latch enable is taken low, the Q outputs are latched

at the logic levels that were set up at the D inputs.

A buffered output-enable (OE) input can be used to place the eight outputs in either a normal logic state (high

or low logic levels) or the high-impedance state. In the high-impedance state, the outputs neither load nor drive

the bus lines significantly. The high-impedance state and increased drive provide the capability to drive bus

lines without interface or pullup components.

To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup

resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

OE does not affect internal operations of the latches. Old data can be retained or new data can be entered while

the outputs are in the high-impedance state.