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W29C020-70

256K x 8 CMOS FLASH MEMORY

Winbond 

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

VPP 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)

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:

100/1K/10K

• Read access time: 70/90/120 nS

• Ten-year data retention

• Software and hardware data protection

• Low power consumption

− Active current: 25 mA (typ.)

− Standby current: 20 µA (typ.)

• Automatic write (erase/program) timing with

internal VPP 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

SOP, TSOP, and 32-pin PLCC

Publication Release Date: February 1998

-1-

Revision A3

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