DM74ALS563AN

Latches Overview

The DM74ALS563AN is an octal D-type transparent latch with 3-state outputs manufactured by onsemi. It operates within a supply voltage range of 4.5V to 5.5V and supports a free air operating temperature from 0°C to +70°C. The device features 20-pin PDIP packaging. Key electrical parameters include a maximum propagation delay of 8ns from data input to output, 10ns setup time, and 10ns hold time. Output drive capabilities are specified at -2.6mA for high level and 24mA for low level.

Latches Feature Summary

• Features 3-state buffer-type outputs designed to drive bus lines directly without interface or pull-up components.
• Utilizes advanced oxide-isolated, ion-implanted Schottky TTL process technology.
• Switching specifications are guaranteed over the full temperature and VCC range.

Latches Applications

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

Latches Procurement Notes

Verify component authenticity through authorized distributors due to discontinued status. Confirm package integrity and pin alignment against JEDEC MS-001 standards. Review datasheet revisions for any parameter updates. Ensure environmental compliance documentation matches project requirements. Validate replacement availability if sourcing new production units is not possible.

Latches Selection Notes

Select this component for designs requiring octal latching with direct bus driving capability. Consider the 3-state output control for multiplexed bus applications. Evaluate the 74ALS logic family speed and power characteristics against system constraints. Verify that the 20-pin PDIP package fits the available PCB footprint and assembly methods.

Latches Part Context

This part belongs to the 74ALS logic family, known for high-speed performance compared to standard TTL. It is an octal register variant providing eight independent latches in a single package. The device was originally produced by Fairchild Semiconductor before the acquisition by onsemi.

Latches Replacement Considerations

Direct substitutes include SN74ALS563BN from Texas Instruments. Verify pinout compatibility and electrical specifications match the original design requirements before substitution.

Latches FAQ

How does the output control input affect internal latch operation?

The output control input places the outputs in a high-impedance state but does not affect the internal operation of the latches. Data can be retained or entered while the outputs are disabled.

What is the function of the enable (G) input?

When the enable (G) is HIGH, the Q outputs follow the data (D) inputs. When taken LOW, the output is latched at the complement of the data level that was set up.