M34C00
3 x 128 bit Serial I虜C Bus EEPROM
For ee-Tags
PRELIMINARY DATA
s
Two-Wire I
2
C Serial Interface
Supports 400 kHz Protocol
2.5 V to 5.5 V Single Supply Voltage
384-bit EEPROM divided in three areas:
鈥?128 bits of non-erasable memory
鈥?128 bits of standard EEPROM
鈥?128 bits that can be permanently Write-
protected (to behave as ROM)
s
s
8
1
SO8 (MN)
150 mil width
TSSOP8 (DW)
169 mil width
s
s
s
s
Self-Timed Program Cycle
Enhanced ESD/Latch-Up Protection
More than 1 Million Erase/Write Cycles
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.
Figure 1. Logic Diagram
VCC
SCL
M34C00
SDA
Table 1. Signal Names
SDA
SCL
V
CC
V
SS
Serial Data
Serial Clock
Supply Voltage
Ground
VSS
AI03394
August 2001
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
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