M27C801-55K1

Memory IC Overview

The M27C801-55K1 is an 8 Mbit (1Mb x 8) UV EPROM and OTP EPROM manufactured by STMicroelectronics. It features a 55 ns access time and operates on a single 5 V ± 10% supply voltage during read operations. The device utilizes Advanced CMOS technology, providing low active current of 35 mA at 5 MHz and standby current of 100 µA. It supports programming with a 12.75 V ± 0.25 V supply and includes electronic signature identification. The component is housed in a 32-lead PLCC package.

Memory IC Feature Summary

• Supports both UV erasable and One-Time Programmable configurations for flexible data storage needs.
• Features a two-line output control function to minimize power dissipation and prevent bus contention in memory arrays.
• Includes Presto IIB programming algorithm for efficient array programming with guaranteed reliability margins.
• Provides electronic signature mode for automatic device identification by programming equipment.

Memory IC Applications

• Applications requiring fast turn-around and pattern experimentation
• Memory systems utilizing multiple connected devices
• Embedded firmware storage where content is programmed once

Memory IC Procurement Notes

Verify the obsolete status of this component before procurement planning. Confirm that the PLCC32 package matches your board layout requirements. Ensure programming equipment supports the specific 12.75 V PP voltage and Presto IIB algorithm. Check environmental compliance documentation if lead-free ECOPACK variants are required instead of standard packages.

Memory IC Selection Notes

Select this part when a 55 ns access speed is required within the M27C801 series. Choose the K suffix specifically for the PLCC32 rectangular plastic leaded chip carrier package. Consider the FDIP32W variant only if UV erasure capability is necessary for the application design.

Memory IC Part Context

This component belongs to the M27C801 family of 8 Mbit EPROMs from STMicroelectronics. The family offers various speed grades and packaging options to suit different system constraints. The M27C801-55K1 represents the high-speed 55 ns class in the PLCC32 form factor.

Memory IC Replacement Considerations

Check for other speed grades like -80 or -100 if timing allows. Verify compatibility with PLCC32 footprints. No direct functional substitutes are listed; consider modern non-volatile alternatives if UV exposure or OTP limitations are constraints.

Memory IC FAQ

How is the Electronic Signature mode activated?

Activate the mode by forcing 11.5V to 12.5V on address line A9 while holding other addresses low. Toggle A0 to read the manufacturer code (20h) and device code (42h).

What is the purpose of the two-line output control?

It allows Chip Enable (E) to select the device and Output Enable (G) to gate data. This ensures deselected devices remain in standby mode and prevents output bus contention.