CAT28F001GI-12B

Memory IC Overview

The CAT28F001GI-12B is a 1 Megabit CMOS Boot Block Flash Memory manufactured by onsemi. It features an asynchronous parallel interface with a 120 ns access time and operates within a 4.5 V to 5.5 V supply voltage range. The device utilizes a blocked architecture comprising one 8 KB boot block, two 4 KB parameter blocks, and one 112 KB main block. It is housed in a 32-pin PLCC package and supports 100,000 program/erase cycles with 10-year data retention.

Memory IC Feature Summary

• Blocked memory architecture with dedicated boot block for secure system code
• Hardware data protection and electronic signature identification
• Deep power-down mode for ultra-low standby current consumption
• Automated embedded programming and erase algorithms

Memory IC Applications

• In-system code updates
• After-sale firmware modifications
• Secure boot code storage
• Parameter data storage

Memory IC Procurement Notes

Verify the specific suffix 'G' indicates the commercial temperature range and 'I' denotes the PLCC package variant. Confirm the '12' designation corresponds to the 120 ns speed grade. Ensure compatibility with existing 12V programming requirements and check for end-of-life status as this component family may be discontinued.

Memory IC Selection Notes

Select this part when a protected boot sector is required to prevent accidental overwriting of critical startup code. The PLCC package is suitable for surface mount applications requiring robust mechanical stability. Consider the 120 ns access time against system clock speeds to ensure timing margins are met during read operations.

Memory IC Part Context

This component belongs to the CAT28F001 series of 1-Megabit Flash memories. The 'G' suffix typically specifies the commercial temperature range, while 'I' identifies the Plastic Leadless Chip Carrier (PLCC) package type. The '12' indicates the 120 nanosecond access speed variant within the product line.

Memory IC Replacement Considerations

Direct substitutes include other CAT28F001 variants with different speed grades or packages, such as CAT28F001N-12B (PLCC) or CAT28F001HI-90TT (TSOP). Verify pinout compatibility and electrical specifications before substitution.

Memory IC FAQ

How is the boot block protected from accidental erasure?

The boot block includes a hardware lock-out feature that requires applying a high voltage (VHH) to the RP or OE pin to enable programming or erasing operations.

What is the purpose of the signature mode?

Signature mode allows the user to identify the IC manufacturer and device type while the device is in the target system by reading specific codes from address 0000H and 0001H.