W29C022 Datasheet, PDF (1/20 Pages) Winbond – 256K x 8 CMOS FLASH MEMORY

W29C022
256K × 8 CMOS FLASH MEMORY
GENERAL DESCRIPTION
The W29C022 is a 2-megabit, 5-volt only CMOS flash memory organized as 256K × 8 bits. The device
can be written (erased and programmed) in-system with a standard 5V power supply. A 12-volt VPP is
not required. The unique cell architecture of the W29C022 results in fast write (erase/ program)
operations with extremely low current consumption compared to other comparable 5-volt flash memory
products. The device can also be written (erased and programmed) by using standard EPROM
programmers.
FEATURES
• Single 5-volt write (erase and program)
operations
• Fast page-write operations
− 128 bytes per page
− Page write (erase/program) cycle: 10 mS
(max.)
− Effective byte-write (erase/program) cycle
time: 39 µS
− Optional software-protected data write
• Fast chip-erase operation: 50 mS
• Two 8 KB boot blocks with lockout
• Typical page write (erase/program) cycles: 1K
• Ten-year data retention
• Software and hardware data protection
• Low power consumption
− Active current: 25 mA (typ.)
− Standby current: 20 µA (typ.)
• Automatic write (erase/program) timing with
internal VPP generation
• End of write (erase/program) detection
− Toggle bit
− Data polling
• Latched address and data
• All inputs and outputs directly TTL compatible
• JEDEC standard byte-wide pinouts
Publication Release Date: March 26, 2002
-1-
Revision A3