DM74LS245WM

Overview

The DM74LS245WM is a 3-STATE Octal Bus Transceiver manufactured by onsemi, originally under Fairchild Semiconductor. It operates within a supply voltage range of 4.75V to 5.25V and supports an operating temperature range of 0°C to +70°C. The device features 8-bit bidirectional data transmission with typical propagation delays of 8ns at 5V. Output drive capabilities include a sink current (IOL) of 24mA and a source current (IOH) of -15mA. It utilizes a 20-Lead Small Outline Integrated Circuit (SOIC) package.

Feature Summary

• Bi-directional bus transceiver functionality in a high-density 20-pin package
• 3-STATE outputs capable of driving bus lines directly
• PNP inputs designed to reduce DC loading on bus lines
• Hysteresis at bus inputs to improve noise margins

Applications

• Asynchronous two-way communication between data buses
• Memory systems
• Microprocessor systems

Procurement Notes

Verify the manufacturer origin carefully, as this component was originally produced by Fairchild Semiconductor before its acquisition by onsemi. Confirm that the specific ordering code matches the required SOIC-20 package variant. Ensure compatibility with standard TTL logic levels and verify that the operating temperature range meets the environmental requirements of the target application.

Selection Notes

Select this component for applications requiring octal bus interfacing with moderate speed requirements. The device is suitable for systems utilizing standard 5V logic families. Consider the 3-STATE output capability for multi-driver bus environments. Evaluate the package size constraints against the available board space, noting the specific dimensions of the SOIC-20 form factor.

Part Context

This part belongs to the 74LS series of logic integrated circuits, specifically the octal bus transceiver category. It serves as a bridge for asynchronous data transfer between different bus segments. The device is characterized by low power Schottky technology, offering a balance between speed and power consumption compared to standard LS logic families.

Replacement Considerations

Direct substitutes include the SN74LS245 from Texas Instruments or other manufacturers producing equivalent 74LS245 specifications. Verify pinout compatibility and electrical characteristics such as propagation delay and output drive strength when selecting an alternative.