SN74ALS373ADBLE

Overview

The SN74ALS373ADBLE 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 a commercial temperature range of 0°C to 70°C. The device features eight latches in a single package, providing full parallel access for loading. Key electrical characteristics include a low-level output current of 24 mA and a high-level output current of -2.6 mA. Propagation delays from data inputs (D) to outputs (Q) range from 2 ns to 19 ns depending on the transition direction.

Feature Summary

• Features three-state bus-driving true outputs designed for driving highly capacitive or relatively low-impedance loads.
• Includes buffered control inputs and pnp inputs that reduce DC loading on data lines.
• Allows retention of old data or entry of new data while outputs are disabled via the OE input.

Applications

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

Procurement Notes

Verify the specific ordering suffix against the official Package Option Addendum to confirm the exact physical package type and manufacturing status. Confirm RoHS compliance and lead finish specifications required for your assembly process. Ensure the selected variant matches the intended operating temperature range and pinout requirements for your PCB design.

Selection Notes

Select this component when designing systems requiring octal data storage with high-drive capability for bus applications. Consider the ALS logic family characteristics regarding speed and power consumption relative to other TTL variants. Verify that the 3-state output configuration aligns with the system's bus architecture and impedance matching needs.

Part Context

This part belongs to the SN74ALS373A series of octal transparent D-type latches with 3-state outputs. It is part of the broader SN54/74ALS/AS logic family produced by Texas Instruments. The device is functionally compatible with standard octal latch designs but offers enhanced drive capabilities suitable for direct bus interfacing without additional interface components.

Replacement Considerations

SN74ALS373AN

FAQ

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

The OE input places the outputs in a high-impedance state but does not affect the internal operations of the latches. Data can be retained or entered while the outputs are off.

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

While the LE input is high, the Q outputs follow the data (D) inputs transparently. When LE is taken low, the Q outputs are latched at the logic levels set up at the D inputs.