SN74ACT533PW

Overview

The SN74ACT533PW is an octal transparent D-type latch with 3-state outputs manufactured by Texas Instruments. It operates within a supply voltage range of 4.5 V to 5.5 V and supports input voltages up to 5.5 V. The device features TTL-voltage compatible inputs and provides inverting outputs capable of driving bus lines directly without interface components. Maximum propagation delay is 11 ns at 5 V. It utilizes a TSSOP-20 package and functions within an operating temperature range of -40°C to +85°C.

Feature Summary

• Octal transparent D-type latches with 3-state inverting outputs
• TTL-voltage compatible inputs accepting voltages up to 5.5 V
• Buffered output-enable (OE) input for high-impedance state control

Applications

• Bus line driving applications
• Data storage and transfer systems
• Parallel-to-serial conversion circuits

Procurement Notes

Verify the specific ordering suffix 'PW' corresponds to the TSSOP-20 package configuration required for your design. Confirm that the operating temperature range of -40°C to +85°C meets your environmental specifications. Ensure OE pin biasing during power-up aligns with datasheet recommendations to maintain the high-impedance state.

Selection Notes

Select this component when an octal latch with 3-state capability is required for bus interfacing. The ACT series offers CMOS compatibility with TTL input levels, simplifying logic level translation. Verify that the maximum propagation delay and setup/hold times satisfy your system timing constraints before finalizing the design.

Part Context

This part belongs to the SN74ACT family of advanced CMOS logic devices. It serves as a functional equivalent to older bipolar TTL latches but with lower power consumption and higher noise immunity. The octal configuration allows for efficient handling of wide data buses in microprocessor-based systems.

Replacement Considerations

SN74ACT533PWR (Same family, Tape & Reel packaging)

FAQ

How does the Output Enable (OE) input affect internal latch operations?

The OE input controls the output state but does not affect the internal operation of the latches. Data can be entered or retained while outputs are in the high-impedance state.

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

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