M34C02 Datasheet, PDF (1/19 Pages) STMicroelectronics – 2 Kbit Serial I²C Bus EEPROM For DIMM Serial Presence Detect

M34C02
2 Kbit Serial I²C Bus EEPROM
For DIMM Serial Presence Detect
s Two Wire I²C Serial Interface
Supports 400 kHz Protocol
s Single Supply Voltage:
– 2.5V to 5.5V for M34C02-W
– 2.2V to 5.5V for M34C02-L
s Software Data Protection for lower 128 bytes
s BYTE and PAGE WRITE (up to 16 bytes)
s RANDOM and SEQUENTIAL READ Modes
s Self-Timed Programming Cycle
s Automatic Address Incrementing
s Enhanced ESD/Latch-Up Protection
s 1 Million Erase/Write Cycles (minimum)
s 40 Year Data Retention (minimum)
DESCRIPTION
The M34C02 is a 2 Kbit serial EEPROM memory
able to lock permanently the data in its first half
(from location 00h to 7Fh). This facility has been
designed specifically for use in DRAM DIMMs
(dual interline memory modules) with Serial
Presence Detect. All the information concerning
the DRAM module configuration (such as its
access speed, its size, its organization) can be
kept write protected in the first half of the memory.
This bottom half of the memory area can be write-
protected using a specially designed software
write protection mechanism. By sending the
device a specific sequence, the first 128 bytes of
Table 1. Signal Names
E0, E1, E2
Chip Enable Inputs
SDA
Serial Data/Address Input/
Output
SCL
Serial Clock
WC
Write Control
V_CC
V_SS
Supply Voltage
Ground
8
1
PSDIP8 (BN)
0.25 mm frame
8
8
1
SO8 (MN)
150 mil width
1
TSSOP8 (DW)
169 mil width
Figure 1. Logic Diagram
VCC
3
E0-E2
SCL
WC
M34C02
SDA
VSS
AI01931
December 1999
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