m35b32 STMicroelectronics, m35b32 Datasheet - Page 6

• Manufacturer Part Number: m35b32
• Description: 32 Kbit, 256-byte Page, Fast Program Eeprom Memory Accessed By Spi Bus Interface
• Manufacturer: STMicroelectronics

Description
1
6/42
Description
The M35B32 is a 32-Kbit electrically erasable programmable memory (EEPROM) accessed
through the SPI bus.
The M35B32 is able to save and store up to 256 bytes within a very short time with the help
of the Event sector, this feature being convenient in cases of an unexpected power loss or if
an urgent data storage is required. The fast storage is performed with a very low energy
budget as the Program time lasts less than 1 ms and as the supply voltage can be as low as
2.5 V associated with a low Programming current (the M35B32 is based on EEPROM cells,
energy-saving technology when compared to the Flash technology).
Memory organization
The M35B32 is split into two sectors:
●
●
The time required to update data is significantly reduced by the Page size (256 bytes) as a
page is updated in a single shot.
Both Data sector and Event sector can be erased either a page at a time (using the Page
Erase instruction) or a sector at a time (using the Sector Erase instruction).
The size of each sector is defined by the user.
Figure 1.
a. Write cycle = 2 cycles = Erase + Program
b. Program cycle = single cycle (a Write cycle includes two cycles: Erase cycle + Program cycle)
the Data sector: standard EEPROM which can be written
a time) with a standard write time and a standard retention time,
the Event sector: data bytes which can be programmed
time) with a fast programming time and a limited retention time.
Logic diagram
RESET
Doc ID 18391 Rev 3
W
D
C
S
V CC
V SS
M35B32
(b)
Q
(a)
by page (1 to 256 bytes at a
AI15472
by page (1 to 256 bytes at
M35B32