M34C02 datasheet(1/19 Pages) STMICROELECTRONICS

Il numero della parte	M34C02

Spiegazioni elettronici	2 Kbit Serial I²C Bus EEPROM For DIMM Serial Presence Detect

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Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

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December 1999

M34C02

2 Kbit Serial I²C Bus EEPROM

For DIMM Serial Presence Detect

PSDIP8 (BN)

0.25 mm frame

SO8 (MN)

150 mil width

TSSOP8 (DW)

169 mil width

8

1

8

1

8

1

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

Figure 1. Logic Diagram

AI01931

3

E0-E2

SDA

VCC

M34C02

WC

SCL

VSS

Table 1. Signal Names

E0, E1, E2

Chip Enable Inputs

SDA

Serial Data/Address Input/

Output

SCL

Serial Clock

WC

Write Control

VCC

Supply Voltage

VSS

Ground

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