Part Number : 27SF020
Function : 256 Kbit / 512 Kbit / 1 Mbit / 2 Mbit (x8)
Package : 32 Pin Type
Maker : Silicon Storage Technology
Pinouts : 
Description :
The SST27SF256 / SST27SF512 / SST27SF010 / 27SF020 are a 32K x8 / 64K x8 / 128K x8 / 256K x8 CMOS, Many-Time Programmable (MTP) low cost flash, manufactured with SST’s proprietary, high performance SuperFlash technology.
The split-gate cell design and thick oxide tunneling injector attain better reliability and manufacturability compared with alternate approaches. These MTP devices can be electrically erased and programmed at least 1000 times using an external programmer with a 12 volt power supply. They have to be erased prior to programming. These devices conform to JEDEC standard pinouts for byte-wide memories.
Features :
1. Organized as 64K x8 / 128K x8 / 256K x8
2. Low Power Consumption
3. Electrical Erase Using Programmer
4. TTL I/O Compatibility
Datasheet PDF Download : 
Others datasheet of same file :
SST27SF020, SST27SF010, SST27SF010-70-3C-NH,
SST27SF010-70-3C-PH, SST27SF010-70-3C-WH