W39L020

256K

× 8 CMOS FLASH MEMORY

Publication Release Date: November 11, 2002

- 1 -

Revision A4

1. GENERAL DESCRIPTION

The W39L020 is a 2Mbit, 3.3-volt only CMOS flash memory organized as 256K

× 8 bits. For flexible

erase capability, the 2Mbits of data are divided into 4 uniform sectors of 64 Kbytes, which are

composed of 16 smaller even pages with 4 Kbytes. The byte-wide (

× 8) data appears on DQ7 − DQ0.

The device can be programmed and erased in-system with a standard 3.3V power supply. A 12-volt

operations with extremely low current consumption (compared to other comparable 3.3-volt flash

memory products). The device can also be programmed and erased by using standard EPROM

programmers.

2. FEATURES

•

Single 3.3-volt operations

− 3.3-volt Read

− 3.3-volt Erase

− 3.3-volt Program

•

Fast Program operation:

− Byte-by-Byte programming: 50 µS (max.)

•

Fast Erase operation:

− Chip Erase cycle time: 100 mS (max.)

− Sector Erase cycle time: 25mS (max.)

− Page Erase cycle time: 25mS (max.)

•

Read access time: 70/90 nS

•

4 Even sectors with 64K bytes each, which is

composed of 16 flexible pages with 4K bytes

•

Any individual sector or page can be erased

•

Hardware protection:

− Optional 16K byte or 64K byte Top/Bottom

Boot Block with lockout protection

•

Flexible 4K-page size can be used as

Parameter Blocks

•

Typical program/erase cycles: 1K/10K

•

Twenty-year data retention

•

Low power consumption

− Active current: 10 mA (typ.)

− Standby current: 5 µA (typ.)

•

End of program detection

− Software method: Toggle bit/Data polling

•

TTL compatible I/O

•

JEDEC standard byte-wide pinouts

•

Available packages: 32L PLCC, 32L TSOP (8 x

20 mm) and 32L STSOP (8 x 14 mm)