W49F020-90B中文資料華邦電子數(shù)據(jù)手冊PDF規(guī)格書

GENERAL DESCRIPTION

The W49F020 is a 2-megabit, 5-volt only CMOS flash memory organized as 256K x 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 mS (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 mA (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