SN74ALS841DW

Overview

The SN74ALS841DW is a 10-bit bus-interface 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 an operating temperature range of 0°C to 70°C. The device features noninverting data inputs and buffered control inputs to reduce DC loading effects. Propagation delay from the data input (D) to the output (Q) ranges from 2 ns to 13 ns, while the latch enable (LE) to output delay spans 7 ns to 26 ns under standard test conditions.

Feature Summary

• Features 3-state buffer-type outputs designed to drive highly capacitive or low-impedance loads directly without interface components.
• Includes buffered control inputs to minimize DC loading effects on upstream circuitry.
• Provides a power-up high-impedance state to ensure safe initialization during system startup.

Applications

• Implementing buffer registers in digital systems
• Configuring I/O ports for peripheral interfacing
• Serving as bidirectional bus drivers
• Functioning as working registers in memory architectures

Procurement Notes

Verify that the component matches the specific SN74ALS841DW designation rather than similar variants like the SN74ALS842, which utilizes inverting inputs. Confirm the package type corresponds to the plastic small-outline (DW) format. Ensure the procurement source provides documentation confirming compliance with the specified electrical characteristics and operational temperature limits defined in the official datasheet.

Selection Notes

Select this component when designing systems requiring 10-bit latching with high-drive capability for bus structures. It is suitable for applications needing extra bus-driving latches for wider address/data paths or buses incorporating parity bits. Consider the ALS series performance characteristics regarding speed and power consumption relative to other logic families available from the manufacturer.

Part Context

This device belongs to the Texas Instruments 74ALS logic family, characterized by advanced low-power Schottky technology. It is part of a broader group including the SN74AS841A and SN74ALS842, sharing the same functional architecture but differing in specific electrical parameters or input polarity. The DW package option provides a surface-mount alternative to the standard plastic DIP formats.

Replacement Considerations

The SN74ALS842 serves as a direct functional substitute if inverting data inputs are acceptable. Designers must verify pin compatibility and ensure that the change from noninverting to inverting logic does not disrupt existing signal inversion requirements in the circuit design.