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W29F020Q-90B

256K x 8 CMOS FLASH MEMORY

Winbond 

Preliminary W49F020

256K × 8 CMOS FLASH MEMORY

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 VPP 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 µS (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 µA (typ.)

• Automatic program and erase timing with

internal VPP 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

Publication Release Date: October 1999

-1-

Revision A1

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