SST39SF020A-70-4I-WHE

Memory IC Overview

The SST39SF020A-70-4I-WHE is a 2 Mbit (256K x 8) CMOS Multi-Purpose Flash manufactured using SuperFlash technology. It operates on a single 4.5V to 5.5V supply and features asynchronous parallel interface with 70 ns access time. The device supports uniform 4 KByte sector erasure, byte-programming, and chip erasure via software command sequences. It includes hardware and software data protection schemes, TTL I/O compatibility, and JEDEC standard pinouts.

Memory IC Feature Summary

• SuperFlash Technology for superior reliability and manufacturability
• Sector-Erase Capability with uniform 4 KByte sectors
• Automatic Write Timing with internal VPP generation
• End-of-Write Detection via Toggle Bit or Data# Polling

Memory IC Applications

• Convenient updating of program memory
• Configuration storage applications
• Data memory storage requiring economical updates

Memory IC Procurement Notes

Verify the specific suffix 'WHE' against official Microchip documentation to confirm package type and temperature range, as datasheets list PLCC, TSOP, and PDIP options. Confirm RoHS compliance status and check for any Product Change Notifications (PCN) affecting this part number before finalizing procurement specifications.

Memory IC Selection Notes

Select this component for systems requiring 2 Mbit non-volatile storage with fast read access times. Ensure the design accommodates the 4.5V to 5.5V operating voltage range. Consider the 70 ns speed grade if system timing requirements exceed 55 ns capabilities. Verify that the target application supports the required software command sequences for programming and erasing operations.

Memory IC Part Context

This part belongs to the SST39SF010A/020A/040 series of Multi-Purpose Flash memories. These devices are designed for high-density surface mount applications and offer improved performance over alternative flash technologies by maintaining fixed erase and program times regardless of cycle count.

Memory IC Replacement Considerations

SST39SF010A-70-4I-WHE (1 Mbit capacity)

Memory IC FAQ

How does the SST39SF020A detect the completion of a write operation?

It uses two software methods: Data# Polling (DQ7) and Toggle Bit (DQ6). DQ7 outputs the complement of true data during programming, while DQ6 toggles between 0 and 1 during erase or program cycles.

What is the sector architecture of this device?

The device features a uniform sector size of 4 KBytes, allowing for sector-by-sector erasure operations.