DM74ALS652WM

Overview

The DM74ALS652WM is an octal 3-STATE bus transceiver and register manufactured by onsemi. It integrates an octal transceiver with an octal D-type register, enabling data transmission between buses or from internal registers to buses. The device features independent control for A and B buses, allowing real-time or stored data transfer via multiplexed select controls. It operates within a supply voltage range of 4.5V to 5.5V and supports clock frequencies up to 40 MHz. Packaged in a 24-lead Small Outline Integrated Circuit (SOIC), it provides high-impedance outputs suitable for direct bus driving.

Feature Summary

• Integrates an octal transceiver with an octal D-type register for bidirectional data flow
• Features 3-STATE buffer-type outputs designed to drive highly-capacitive loads directly
• Includes multiplexed real-time and stored data selection using make-before-break configuration
• Provides independent enable and register controls for separate A and B bus operations

Applications

• Implementing buffer registers in bus-oriented systems
• Serving as I/O ports for microprocessor interfaces
• Functioning as bidirectional bus drivers
• Operating as working registers for temporary data storage

Procurement Notes

Verify the specific package variant, as the DM74ALS652 series includes both SOIC and PDIP options. Confirm that the ordering code matches the required physical footprint for your PCB design. Check for RoHS compliance status if environmental regulations apply to your manufacturing process. Ensure the component meets the recommended operating temperature range of 0°C to +70°C for your intended application environment.

Selection Notes

Select this component when an octal width is required for bus interfacing with integrated storage capabilities. The ALS logic family offers a balance of speed and power consumption suitable for general-purpose digital systems. Consider the 3-STATE output capability if multiple devices share common bus lines without external pull-up resistors. Verify that the 40 MHz maximum clock frequency aligns with your system's timing requirements.

Part Context

This part belongs to the 74ALS logic family, which utilizes Advanced Low-power Schottky technology. The DM74ALS652 specifically addresses applications requiring simultaneous data latching and bidirectional transfer. It replaces older standard TTL equivalents with improved switching speeds while maintaining compatible logic levels. The device is often used in legacy computer architectures and industrial control systems requiring robust bus management.

Replacement Considerations

Compatible substitutes include the DM74AS652 for higher speed performance and the DM74ALS652-01 variant. Cross-reference with other manufacturers' 8-bit registered bus transceivers such as the TC74HCT652AP if CMOS compatibility is preferred. Ensure pinout compatibility when substituting to avoid circuit redesign.