SN74ABT533ADBR

Latches Overview

The SN74ABT533ADBR is an octal transparent D-type latch with 3-state outputs manufactured by Texas Instruments. It utilizes state-of-the-art EPIC-II BiCMOS design to significantly reduce power dissipation while providing high-drive outputs capable of driving highly capacitive or low-impedance loads. The device operates within a supply voltage range of 4.5 V to 5.5 V and supports TTL input levels. It features buffered output-enable (OE) and latch-enable (LE) inputs, allowing data retention or entry even when outputs are in the high-impedance state. The component is characterized for operation from -40°C to +85°C and is housed in a 20-pin TSSOP package.

Latches Feature Summary

• Octal transparent D-type latches with 3-state outputs designed for driving highly capacitive or relatively low-impedance loads
• State-of-the-art EPIC-II BiCMOS design that significantly reduces power dissipation
• Buffered output-enable (OE) input allows placement of outputs in normal logic states or high-impedance state without affecting internal latch operations
• Latch-enable (LE) input controls data transparency, latching Q outputs at the inverse of D input levels when LE transitions low

Latches Applications

• Implementing buffer registers
• I/O ports
• Bidirectional bus drivers
• Working registers

Latches Procurement Notes

Verify the specific ordering suffix matches the required package type, as the SN74ABT533A series is available in multiple configurations including TSSOP (PW), SSOP (DB), and PDIP (N). Confirm the temperature grade corresponds to your application requirements, ensuring the 'A' suffix indicates the commercial -40°C to +85°C range rather than the military grade. Check RoHS compliance status and lead finish options during sourcing to ensure compatibility with assembly processes.

Latches Selection Notes

Select this component when designing systems requiring octal data storage with high-drive capabilities for bus applications. The BiCMOS technology offers lower power consumption compared to standard bipolar counterparts while maintaining fast switching speeds suitable for high-frequency data transfer. Ensure the load capacitance and impedance characteristics align with the specified drive currents to maintain signal integrity across the bus lines.

Latches Part Context

This part belongs to the SN74ABT533A family of octal transparent D-type latches. It shares functional similarities with other ABT series devices but is specifically optimized for high-drive applications. The 'A' designation distinguishes it from the SN54ABT533, which covers the full military temperature range. It serves as a key component in digital logic circuits requiring parallel data storage and controlled output buffering.

Latches Replacement Considerations

SN74ABT533APWR

Latches FAQ

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

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

What is the recommended configuration for OE during power-up or power-down?

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