Rainbow Electronics W29C020C - Manual

W29C020C
256K x 8 CMOS FLASH MEMORY
Publication Release Date: April 1999
- 1 - Revision A1
GENERAL DESCRIPTION
The W29C020C 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 V PP is
not required. The unique cell architecture of the W29C020C 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
µ
S
−
Optional software-protected data write
•
Fast chip-erase operation: 50 mS
• Two 8 KB boot blocks with lockout
• Whole chip cycling:
10K (typ.)
• Read access time: 70/90/120 nS
• Twenty-year data retention
• Software and hardware data protection
• Low power consumption
−
Active current: 25 mA (typ.)
−
Standby current: 20
µ
A (typ.)
• Automatic write (erase/program) timing with
internal V
PP 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
• Available packages: 32-pin 600 mil DIP, 32-pin
TSOP, and 32-pin PLCC