DM74ALS640AN

Overview

The DM74ALS640AN is an inverting octal bus transceiver manufactured by onsemi, utilizing the Advanced Oxide-isolated Ion-implanted Schottky TTL process. It facilitates asynchronous two-way communication between data busses, transmitting data from the A bus to the B bus or vice versa based on the direction control (DIR) input level. The device features a dedicated enable input (G) for isolating busses when disabled. It operates within a supply voltage range of 4.5V to 5.5V and supports a propagation delay of 11ns at 50pF load. The component is housed in a 20-Lead Plastic Dual-In-Line Package (PDIP).

Feature Summary

• Advanced Oxide-isolated Ion-implanted Schottky TTL process technology.
• Inverting octal bus transceiver design for asynchronous two-way communication.
• Direction control input manages data flow between A and B buses.
• Enable input allows effective isolation of busses.

Applications

• Asynchronous two-way communication between data busses.
• Data transmission between A bus and B bus.
• Bus isolation applications via enable control.

Procurement Notes

Verify the specific ordering code suffix 'N' corresponds to the 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide. Confirm that the manufacturer designation aligns with Fairchild Semiconductor specifications as referenced in the datasheet. Ensure compatibility with the recommended operating conditions regarding supply voltage and temperature ranges before procurement.

Selection Notes

Select this component for applications requiring inverting octal bus transceivers with TTL-compatible inputs. Consider the 20-Lead PDIP package for through-hole mounting requirements. Evaluate the switching performance guarantees over the full temperature and VCC supply range. Verify that the 11ns propagation delay meets system timing constraints under a 50 pF load condition.

Part Context

This device belongs to the 74ALS logic family, characterized by high-speed operation and low power consumption compared to standard TTL. The DM74ALS640A series specifically addresses bidirectional data transfer needs in digital systems. The 'N' suffix denotes the plastic dual-in-line package variant, distinct from surface-mount options like the SOIC package.

Replacement Considerations

SN74ALS640A