
W39V040A
Publication Release Date: June 21, 2005
- 3 -
Revision A6
1.
GENERAL DESCRIPTION
The W39V040A is a 4-megabit, 3.3-volt only CMOS flash memory organized as 512K
× 8 bits. For
flexible erase capability, the 4Mbits of data are divided into 8 uniform sectors of 64 Kbytes, which are
composed of 16 smaller even pages with 4 Kbytes. The device can be programmed and erased
in-system with a standard 3.3V power supply. A 12-volt VPP is not required. The unique cell
architecture of the W39V040A results in fast program/erase operations with extremely low current
consumption. This device can operate at two modes, Programmer bus interface mode and LPC bus
interface mode. As in the Programmer interface mode, it acts like the traditional flash but with a
multiplexed address inputs. But in the LPC interface mode, this device complies with the Intel LPC
specification. The device can also be programmed and erased 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: 35 μS (typ.)
Fast Erase Operation:
Chip erase 100 mS (max.)
Sector erase 25 mS (max.)
Page erase 25 mS (max.)
Fast Read access time: Tkq 11 nS
Endurance: 10K cycles (typ.)
Twenty-year data retention
8 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 Boot Block with lockout protection
#TBL & #WP support the whole chip hardware protection
Flexible 4K-page size can be used as Parameter Blocks
Low power consumption
Active current: 12.5 mA
(typ. for LPC mode)
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
Available packages: 32L PLCC, 32L STSOP, 40L TSOP, 32L PLCC Lead free, 32L STSOP Lead
free and 40L TSOP Lead free