SN74ABT843DW集成电路（IC）的锁存器规格书PDF中文资料

SN74ABT843DW属于集成电路（IC）的锁存器。由德州仪器制造生产的SN74ABT843DW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。

State-of-the-Art EPIC-IIBE BiCMOS Design

Significantly Reduces Power Dissipation

Latch-Up Performance Exceeds 500 mA Per

JEDEC Standard JESD-17

Typical VOLP (Output Ground Bounce) < 1 V

at VCC = 5 V, TA = 25°C

High-Drive Outputs (–32-mA IOH, 64-mA IOL)

Package Options Include Plastic

Small-Outline (DW) and Shrink

Small-Outline (DB) Packages, Ceramic Chip

Carriers (FK), Ceramic Flat (W) Package,

and Plastic (NT) and Ceramic (JT) DIPs

description

The ’ABT843 9-bit latches are 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 nine transparent D-type latches provide true

data at the outputs.

A buffered output-enable (OE) input can be used

to place the nine outputs in either a normal logic

state (high or low logic levels) or a

high-impedance state. The outputs are also in the

high-impedance state during power-up and

power-down conditions. The outputs remain in the

high-impedance state while the device is powered

down. 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

need for interface or pullup components.

OE does not affect the internal operations of the latch. Previously stored data can be retained or new data can

be entered while the outputs are in the high-impedance state.

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.

The SN54ABT843 is characterized for operation over the full military temperature range of –55°C to 125°C. The

SN74ABT843 is characterized for operation from –40°C to 85°C.