SN74ACT563DBLE

Overview

The SN74ACT563DBLE is an octal D-type transparent latch with 3-state inverted outputs manufactured by Texas Instruments. It operates on a 4.5-V to 5.5-V supply voltage and features inputs compatible with TTL voltage levels. The device includes a buffered output-enable input that places the eight outputs in either a normal logic state or a high-impedance state, allowing direct bus line driving without interface components. Key electrical parameters include a maximum propagation delay of 11.5 ns at 5 V, a low-level output current of 24 mA, and a high-level output current of -24 mA.

Feature Summary

• Octal D-type transparent latches with 3-state inverted outputs
• Buffered output-enable input for high-impedance control
• TTL-voltage compatible inputs accepting voltages up to 5.5 V
• Flow-through architecture optimized for PCB layout

Applications

• Bus-oriented memory mapping
• Registering wide data words
• Driving bus lines directly

Procurement Notes

Verify the specific package suffix 'DBLE' against official ordering lists, as standard documentation typically lists 'DBR' (SSOP) or 'DW' (SOIC). Confirm RoHS compliance and lead finish details via the manufacturer's latest packaging addendum. Ensure application requirements match the specified operating temperature range and electrical characteristics before finalizing procurement.

Selection Notes

Select this component when designing systems requiring parallel data storage with tri-state bus interfacing capabilities. The ACT series offers faster switching speeds compared to legacy counterparts while maintaining CMOS power efficiency. Consider the flow-through pinout if minimizing trace length and optimizing board space are critical design constraints.

Part Context

This part belongs to the SN54/74ACT family of logic integrated circuits produced by Texas Instruments. The family provides advanced CMOS technology suitable for high-speed digital applications. The SN74ACT563 specifically addresses needs for octal data latching within industrial and commercial electronic systems.

Replacement Considerations

SN74ACT563DBR

FAQ

How does the output-enable input affect internal latch operations?

The output-enable input does not affect the internal operations of the latches. Old data can be retained or new data entered while the outputs are in the high-impedance state.

What is required to ensure the high-impedance state during power-up?

To ensure the high-impedance state during power-up or power-down, the output-enable input should be tied to VCC through a pullup resistor.