DM74ALS245AN

Overview

The DM74ALS245AN is an octal 3-STATE bus transceiver from the ALS series, manufactured by onsemi (formerly Fairchild). It utilizes a 20-pin Plastic Dual-In-Line (PDIP) package. The device operates within a supply voltage range of 4.5V to 5.5V and supports an operating temperature range of 0°C to +70°C. Key electrical parameters include a HIGH Level Output Current of -15mA and a LOW Level Output Current of 24mA. Propagation delay times are specified between 3ns and 10ns depending on the transition direction.

Feature Summary

• Advanced oxide-isolated, ion-implanted Schottky TTL process for low power operation
• Non-inverting logic output with glitch-free bus behavior during power transitions
• Independent 3-STATE control for A and B buses via enable input
• Low output impedance capable of driving terminated transmission lines

Applications

• Memory systems
• Microprocessor systems
• Asynchronous bidirectional data buses

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm the specific ordering code matches the required package type and suffix. Check for RoHS compliance status if environmental regulations apply to the target assembly. Ensure the supplier provides valid traceability documentation for quality assurance purposes.

Selection Notes

Select this component when designing circuits requiring octal bidirectional data transfer in microprocessor or memory architectures. The 3-STATE outputs allow effective bus isolation when disabled. Consider the PDIP package constraints for through-hole mounting requirements. Verify that the system voltage aligns with the 4.5V to 5.5V operating range.

Part Context

This part belongs to the 74ALS family of logic devices, characterized by advanced low-power Schottky technology. It serves as a standard interface solution for connecting multiple digital components. The device replaces older 74LS equivalents with improved speed and lower power consumption while maintaining compatible pinouts and logical functions.

Replacement Considerations

Public confirmed substitute part numbers include SN74ALS245A-1N and SN74ALS245AN from Texas Instruments.