SN74AS533AN

Overview

The SN74AS533AN is an octal D-type transparent latch with 3-state outputs from the Texas Instruments AS logic series. It operates on a single supply voltage ranging from 4.5 V to 5.5 V. The device features eight parallel data inputs and corresponding inverted outputs, controlled by a Latch Enable (LE) signal. When LE is high, outputs follow input complements; when low, data is latched. An Output Enable (OE) input controls the three-state bus driving capability. Key electrical parameters include a maximum propagation delay of 9.5 ns from control inputs to outputs, a high-level output current of -15 mA, and a low-level output current of 48 mA.

Feature Summary

• Features eight D-type transparent latches with inverting 3-state outputs designed for driving highly capacitive or low-impedance loads.
• Includes buffered control inputs that utilize PNP structures to reduce DC loading on data lines.
• Provides independent Output Enable (OE) functionality to place outputs in a high-impedance state without affecting internal latch operations.

Applications

• Implementing buffer registers in digital systems
• Serving as I/O ports for peripheral interfacing
• Functioning as bidirectional bus drivers
• Operating as working registers within data processing circuits

Procurement Notes

Verify the specific ordering suffix 'AN' corresponds to the standard plastic 300-mil DIP package configuration. Confirm the component belongs to the SN74AS533A family rather than the SN74ALS533A variant, as performance characteristics differ significantly between these logic families. Ensure the procurement specification matches the required operating temperature range of 0°C to 70°C.

Selection Notes

Select this component when high-speed data latching with strong drive capability is required. The AS series offers faster switching speeds compared to ALS counterparts but consumes higher power. Verify that the system design accommodates the increased current consumption during active states. Ensure the application requires inverting outputs, as non-inverting variants like the SN74AS373 exist.

Part Context

This component is part of the Texas Instruments SN74AS533A product line, which consists of octal D-type transparent latches with 3-state outputs. It is functionally equivalent to the SN74AS373, distinguished primarily by its inverted output polarity. The device is manufactured using bipolar technology and is characterized for operation within the standard commercial temperature range.

Replacement Considerations

The SN74ALS533A serves as a functional substitute within the same logic family architecture, though it exhibits slower switching speeds and lower output drive currents. Designers must account for differences in propagation delay and power consumption when substituting between the AS and ALS series variants.