Rainbow Electronics W49F020 - Manual

Preliminary W49F020
256K
×
8 CMOS FLASH MEMORY
Publication Release Date: October 1999
- 1 - Revision A1
GENERAL DESCRIPTION
The W49F020 is a 2-megabit, 5-volt only CMOS flash memory organized as 256K
×
8 bits. The device
can be programmed and erased in-system with a standard 5V power supply. A 12-volt V PP is not
required. The unique cell architecture of the W49F020 results in fast program/erase operations with
extremely low current consumption (compared to other comparable 5-volt flash memory products). The
device can also be programmed and erased using standard EPROM programmers.
FEATURES
• Single 5-volt operations:
−
5-volt Read
−
5-volt Erase
−
5-volt Program
• Fast Program operation:
−
Byte-by-Byte programming: 50
µ
S (max.)
• Fast Erase operation: 100 mS (typ.)
• Fast Read access time: 70/90 nS
• Endurance: 1K/10K cycles (typ.)
• Twenty-year data retention
• Hardware data protection
• One 8K byte Boot Block with Lockout
protection
• Low power consumption
−
Active current: 25 mA (typ.)
−
Standby current: 20
µ
A (typ.)
• Automatic program and erase timing with
internal V PP generation
• End of program or erase detection
−
Toggle bit
−
Data polling
• Latched address and data
• TTL compatible I/O
• JEDEC standard byte-wide pinouts
• Available packages: 32-pin DIP and 32-pin
TSOP and 32-pin-PLCC