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NM24C65U Datasheet(PDF) 1 Page - Fairchild Semiconductor

Part No. NM24C65U
Description  64K-Bit Serial EEPROM with Write Protect 2-Wire Bus Interface
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Maker  FAIRCHILD [Fairchild Semiconductor]
Homepage  http://www.fairchildsemi.com
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www.fairchildsemi.com
NM24C65U Rev. B.1
PRELIMINARY
August 1999
© 1999 Fairchild Semiconductor Corporation
NM24C65U
64K-Bit Serial EEPROM with Write Protect
2-Wire Bus Interface
General Description:
The NM24C65U is a 64K (65,536) bit serial interface CMOS
EEPROM (Electrically Erasable Programmable Read-Only
Memory). This device fully conforms to the Extended I2C™ 2-wire
protocol which uses Clock (SCL) and Data I/O (SDA) pins to
synchronously clock data between the "master" (for example a
microprocessor) and the "slave" (the EEPROM device). In addi-
tion, the serial interface allows a minimal pin count packaging
designed to simplify PC board layout requirements and offers the
designer a variety of low voltage and low power options.
NM24C65U incorporates a hardware "Write Protect" feature, by
which the upper half of the memory can be disabled against
programming by connecting the WP pin to V
CC. This section of
memory then effectively becomes a ROM (Read-Only Memory)
and can no longer be programmed as long as WP pin is connected
to V
CC.
Fairchild EEPROMs are designed and tested for applications requir-
ing high endurance, high reliability and low power consumption for a
Block Diagram
continuously reliable non-volatile solution for all markets.
Functions
I I2C™ compatible interface
I 65,536 bits organized as 8,192 x 8
I 100 KHz or 400 KHz operation
I Extended 2.7V – 5.5V operating voltage
I Self timed programming cycle (6ms typical)
I "Programming complete" indicated by ACK polling
I Memory "Upper Block" Write Protect pin
Features
I The I2C™ interface allows the smallest I/O pincount of any
EEPROM interface
I 32 byte page write mode to minimize total write time per byte
I Low V
CC programming lockout (3.8V)
— "H" option (Standard V
CC range) parts only
I Typical 200µA active current (I
CCA)
I Typical 1µA standby current (I
SB) for "L" devices and 0.1µA
standby current for "LZ" devices
I Endurance: Up to 1,000,000 data changes
I Data retention greater than 40 years
DS800012-1
H.V. GENERATION
TIMING &CONTROL
E2PROM
ARRAY
YDEC
DATA REGISTER
XDEC
CONTROL
LOGIC
WORD
ADDRESS
COUNTER
SLAVE ADDRESS
REGISTER &
COMPARATOR
START
STOP
LOGIC
WRITE
LOCKOUT
START CYCLE
CK
DIN
R/W
LOAD
INC
SDA
SCL
WP
VCC
DOUT
A2
A1
A0
I2C™ is a registered trademark of Philips Electronics N.V.




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