W29C020
256K
×
8 CMOS FLASH MEMORY
GENERAL DESCRIPTION
The W29C020 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 W29C020 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)
•
•
Software and hardware data protection
Low power consumption
−
Active current: 25 mA (typ.)
−
Standby current: 20
µA
(typ.)
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:
•
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, 450 mil
100/1K/10K
•
Read access time: 70/90/120 nS
•
Ten-year data retention
SOP, TSOP, and 32-pin PLCC
-1-
Publication Release Date: February 1998
Revision A3
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