M74HC670M1R

Overview

The M74HC670M1R is a high-speed CMOS 4-word by 4-bit register file featuring three-state outputs, fabricated using silicon gate C2MOS technology. It supports simultaneous read and write operations via separate address and enable inputs. The device operates within a wide voltage range of 2V to 6V, with typical propagation delays of 22ns at 6V. It offers low power dissipation, with a maximum quiescent current of 4μA at 25°C, and provides high noise immunity with input levels defined as 28% of VCC minimum.

Feature Summary

• Supports simultaneous independent read and write operations through dedicated address and enable lines.
• Features three-state outputs allowing parallel connection of multiple devices to expand word capacity.
• Includes protection circuits against static discharge and transient excess voltage on all inputs.

Applications

• High-speed data buffering in digital systems
• Register file implementation in microprocessor architectures
• Memory expansion modules requiring parallel output interfacing

Procurement Notes

Verify component status carefully as this model is listed as obsolete in official documentation. Confirm availability through authorized distributors or secondary markets if sourcing for production. Ensure the specific SOP-16 package variant matches your board design requirements. Check for potential supply chain constraints associated with end-of-life components.

Selection Notes

Select this component when a compact 4x4 register file with tri-state capability is required. It is suitable for designs needing simultaneous access modes and wide voltage operation. Consider pin compatibility with standard 74 series logic if migrating from older technologies. Evaluate space constraints as it is available in small outline packages.

Part Context

This part belongs to the STMicroelectronics M74HC670 family of high-speed CMOS logic devices. It is specifically designed as a register file rather than a simple latch or flip-flop. The M1R suffix indicates the Small Outline Package (SOP) configuration. It serves as a specialized memory element within broader digital logic families.

Replacement Considerations

Check for direct pin-compatible alternatives from other manufacturers that offer similar 4x4 register file functionality with three-state outputs. Verify that any substitute maintains the same operating voltage range and propagation delay characteristics. Ensure the replacement is actively manufactured if long-term supply stability is required.