M27W401-80K6

Memory IC Overview

The M27W401-80K6 is a 4 Mbit (512K x 8) low voltage UV EPROM manufactured by STMicroelectronics. It operates with a supply voltage range of 2.7V to 3.6V and features an access time of 80 ns at VCC = 2.7V to 3.6V, guaranteeing 70 ns at 3.0V to 3.6V. The device utilizes PLCC32 packaging and supports a temperature range of -40°C to +85°C. Key electrical parameters include a maximum standby current of 15 µA and an active current of 15 mA at 5 MHz. Programming requires a 12.75V supply on VPP with a typical pulse width of 100 µs.

Memory IC Feature Summary

• Supports ultraviolet erasure for reusable data storage applications
• Features low power consumption with microampere standby current levels
• Compatible with standard Presto II programming algorithms
• Includes electronic signature identification for automated programming equipment

Memory IC Applications

• Microprocessor systems requiring large program storage
• Battery-powered devices benefiting from low voltage operation
• Industrial control systems operating in extended temperature ranges
• Automotive electronics utilizing robust CMOS technology

Memory IC Procurement Notes

Verify component authenticity through official STMicroelectronics channels or authorized distributors. Confirm package integrity and lead condition prior to installation. Ensure programming equipment supports the specific 12.75V VPP requirement and Presto II algorithm. Check for ECOPACK compliance if environmental regulations apply. Validate that the PLCC32 footprint matches the target PCB design specifications.

Memory IC Selection Notes

Select this component when designing systems requiring non-volatile memory with reprogrammable capabilities via ultraviolet light. Consider the PLCC32 package for through-hole mounting requirements where surface mount options are unsuitable. Evaluate the 2.7V minimum supply voltage against system battery constraints. Verify that the 80 ns access time meets the processor bus speed requirements for the intended application architecture.

Memory IC Part Context

This part belongs to the M27W401 series of low voltage EPROMs. It serves as a direct pin-compatible alternative to the M27C4001, maintaining identical electronic signatures and programming interfaces. The series offers flexibility through various package options including ceramic DIP, plastic DIP, and TSOP variants. It represents a transition toward lower power consumption while maintaining high reliability standards for industrial environments.

Memory IC Replacement Considerations

The M27W401-80K6 is pin-compatible with the M27C4001. Designers may substitute the M27C4001 directly without circuit modifications. Ensure the replacement programmer supports the specific voltage levels required for the M27W401 series.

Memory IC FAQ

How is the M27W401-80K6 erased?

The device is erased by exposing the transparent window on the FDIP32W package to short-wave ultraviolet light with a wavelength of approximately 2537 Å.

What is the programming voltage required for this device?

Programming requires a voltage of 12.75V applied to the VPP pin, while VCC is maintained at 6.25V during the programming process.

Does this component support electronic signature reading?

Yes, the device supports electronic signature mode to read manufacturer code 20h and device code 41h for automatic identification by programming equipment.