SN74ACT533DBR

Overview

The SN74ACT533DBR 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 inputs compatible with TTL logic levels. The device provides maximum propagation delays of 11 ns at 5 V. It includes a buffered output-enable input to control the high-impedance state, allowing direct bus line driving without interface components. The component is housed in a 20-pin SSOP package.

Feature Summary

• Octal transparent D-type latching functionality
• Three-state outputs for bus line interfacing
• TTL-voltage compatible inputs
• Buffered output-enable control

Applications

• Bus-oriented memory mapping
• Registering wide data words
• Performing temporary data storage

Procurement Notes

Verify the specific ordering suffix 'DBR' corresponds to the SSOP-20 tape and reel packaging configuration. Confirm that the required operating temperature range aligns with the industrial specification (-40°C to +85°C). Ensure design compatibility with the 4.5-V to 5.5-V supply voltage limits and check for any applicable RoHS compliance documentation prior to final procurement.

Selection Notes

Select this component when an octal latch with inverted outputs and three-state capability is required. It is suitable for applications needing TTL-compatible inputs and direct bus interfacing. Consider alternative packages such as SOIC or PDIP if surface-mount SSOP form factors are unsuitable for the target PCB layout constraints.

Part Context

This part belongs to the SN54/74ACT series of advanced CMOS logic devices. The ACT series combines the speed of Schottky TTL with low power consumption typical of standard CMOS technology. This specific variant focuses on providing eight independent latching channels within a single integrated circuit package.

Replacement Considerations

SN74ACT533DW

FAQ

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

The OE pin controls only the external output state. It does not affect the internal operation of the latches, meaning new data can be entered or old data retained while the outputs are in the high-impedance state.

What is the behavior of the Q outputs when the Latch Enable (LE) input is low?

When LE is taken low, the Q outputs are latched at the inverted levels set up at the D inputs, holding the previous state regardless of subsequent changes at the D inputs.