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PRELIMINARY DATA

August 2001

This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.

M34C00

3 x 128 bit Serial I²C Bus EEPROM

For ee-Tags

SO8 (MN)

150 mil width

TSSOP8 (DW)

169 mil width

8

1

Figure 1. Logic Diagram

AI03394

SDA

VCC

M34C00

SCL

VSS

Table 1. Signal Names

SDA

Serial Data

SCL

Serial Clock

Supply Voltage

Ground

s

Supports 400 kHz Protocol

s

2.5 V to 5.5 V Single Supply Voltage

s

384-bit EEPROM divided in three areas:

– 128 bits of non-erasable memory

– 128 bits of standard EEPROM

– 128 bits that can be permanently Write-

protected (to behave as ROM)

s

Self-Timed Program Cycle

s

Enhanced ESD/Latch-Up Protection

s

More than 1 Million Erase/Write Cycles

s

More than 40 Year Data Retention

DESCRIPTION

The M34C00 is a 384-bit serial EEPROM. The

bottom third of the memory area (from location 00h

to 0Fh) can be Write-protected using a specially

designed software Write-protection mechanism.

By sending the device a specific sequence, the

first 128 bits of the memory become permanently

Write-protected. Care must be taken when using

this sequence as its effect cannot be reversed.

The top third of the memory area (from location

20h to 2Fh) is already configured to give the

functional equivalence of a non-erasable memory.

That is, it is initialized to all 1s (FFh), and the user

is able to reset any number of those 1s to 0; but

there is no mechanism for the user to set a 0 back

to a 1.

The M34C00 is a 384-bit electrically erasable

programmable memory (EEPROM), organized as

48 x 8 bits.