SN74ABT162823A - 具有三态输出的 18 位总线接口触发器

SN74ABT162823A是TI德州仪器公司的一款D类触发器产品，SN74ABT162823A是具有三态输出的 18 位总线接口触发器，本站介绍了SN74ABT162823A的封装应用图解、特点和优点、功能等，并给出了与SN74ABT162823A相关的TI元器件型号供参考。

SN74ABT162823A - 具有三态输出的 18 位总线接口触发器 - D类触发器 - 触发器/锁存器/寄存器 - 德州仪器

产品描述

These 18-bit bus-interface flip-flops feature 3-state outputs designed specifically for driving highly capacitive or relatively low-impedance loads. They are particularly suitable for implementing wider buffer registers, I/O ports, bidirectional bus drivers with parity, and working registers.

The ’ABT162823A devices can be used as two 9-bit flip-flops or one 18-bit flip-flop. With the clock-enable (CLKEN)\ input low, the D-type flip-flops enter data on the low-to-high transitions of the clock. Taking CLKEN\ high disables the clock buffer, thus latching the outputs. Taking the clear (CLR)\ input low causes the Q outputs to go low independently of the clock.

A buffered output-enable (OE)\ input places the nine outputs in either a normal logic state (high or low level) or a 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. OE\ does not affect the internal operation of the flip-flops. Old data can be retained or new data can be entered while the outputs are in the high-impedance state.

The outputs, which are designed to source or sink up to 12 mA, include equivalent 25- series resistors to reduce overshoot and undershoot.

These devices are fully specified for hot-insertion applications using Ioff and power-up 3-state. The Ioff circuitry disables the outputs, preventing damaging current backflow through the devices when they are powered down. The power-up 3-state circuitry places the outputs in the high-impedance state during power up and power down, which prevents driver conflict.

To ensure the high-impedance state during power up or power down, OE\ shall be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

产品特性

Members of the Texas Instruments Widebus™ Family
Output Ports Have Equivalent 25- Series Resistors So No External Resistors Are Required
Typical VOLP (Output Ground Bounce) <1 V at VCC = 5 V, TA = 25°C
High-Impedance State During Power Up and Power Down
Ioff and Power-Up 3-State Support Hot Insertion
Distributed VCC and GND Pins Minimize High-Speed Switching Noise
Flow-Through Architecture Optimizes PCB Layout

Widebus is a trademark of Texas Instruments.

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