SN74ACT533N

Overview

The SN74ACT533N is an octal transparent D-type latch with 3-state outputs manufactured by Texas Instruments. It operates on a 4.5-V to 5.5-V supply voltage and features TTL-voltage compatible inputs that accept voltages up to 5.5 V. The device provides a maximum propagation delay of 11 ns at 5 V. It includes eight data inputs, corresponding inverted outputs, a latch-enable input, and a buffered output-enable input for bus driving.

Feature Summary

• Octal transparent D-type latching architecture
• Three-state inverting outputs for direct bus line driving
• TTL-voltage compatible inputs accepting up to 5.5 V
• Buffered output-enable control for high-impedance state management

Applications

• Bus-oriented memory mapping
• Registering wide data words
• Driving bus lines without interface components

Procurement Notes

Verify the specific package type and temperature rating against project requirements. Confirm RoHS compliance and lead finish details via the manufacturer's ordering information. Ensure unused inputs are tied to VCC or GND during operation. Check current product status as manufacturing availability may change over time.

Selection Notes

Select this component when designing systems requiring parallel data storage with tri-state output control. The ACT series offers faster switching speeds compared to standard 74LS logic. Verify that the operating temperature range meets environmental conditions and that the 20-pin PDIP package fits the board layout constraints.

Part Context

This part belongs to the SN74ACT family of advanced CMOS logic devices from Texas Instruments. These components bridge the performance gap between older TTL technologies and modern low-voltage CMOS standards. The octal latch configuration allows for efficient handling of large data buses within digital logic circuits.

Replacement Considerations

SN74ACT533DW (SOIC Package)

FAQ

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

The output-enable input only controls the external output state. It does not affect the internal operations of the latches, allowing new data to be entered while outputs remain 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 output-enable input should be tied to VCC through a pullup resistor.