DM74ALS245AWM

Overview

The DM74ALS245AWM is an octal 3-STATE bus transceiver manufactured by Fairchild Semiconductor, now part of onsemi. It utilizes an advanced low power Schottky process and operates within a supply voltage range of 4.5V to 5.5V. The device features non-inverting logic outputs and is housed in a 20-Lead Small Outline Integrated Circuit (SOIC) package with JEDEC MS-013 dimensions. It supports bidirectional data transmission controlled by DIR and G inputs, ensuring glitch-free operation during power transitions.

Feature Summary

• Advanced oxide-isolated, ion-implanted Schottky TTL process for improved performance
• Glitch-free bus operation during power up and down sequences
• Low output impedance capable of driving terminated transmission lines
• PNP inputs designed to reduce input loading

Applications

• Memory systems
• Microprocessor systems
• Asynchronous bidirectional data buses

Procurement Notes

Verify the manufacturer origin, as this component was originally produced by Fairchild Semiconductor before its acquisition by onsemi. Confirm that the specific ordering code matches the SOIC M20B package description. Ensure compliance with RoHS standards if required by the application environment. Check for any specific lifecycle status updates regarding availability from authorized distributors.

Selection Notes

Select this component when designing systems requiring octal bus transceivers with high-speed switching characteristics. It is suitable for applications needing interface capabilities with CMOS devices at specified voltage levels. Consider the operating temperature range of 0°C to +70°C for environmental compatibility. Evaluate the propagation delay specifications against system timing requirements.

Part Context

This device belongs to the 74ALS series of logic integrated circuits, known for advanced low-power Schottky technology. It serves as a standard solution for data bus interfacing in digital electronics. The octal configuration allows for efficient handling of wide data paths in parallel communication architectures.

Replacement Considerations

SN74ALS245A-1N Texas Instruments

FAQ

How is the direction of data transmission controlled?

Two-way communication between buses is controlled by the DIR input, allowing data to transmit either from the A bus to the B bus or vice versa.

What happens when the enable input is set to HIGH?

When the enable input (G) is HIGH, both the driver and receiver outputs enter the high impedance mode, effectively isolating the buses.