NM24C04U Datasheet, PDF (1/13 Pages) Fairchild Semiconductor – EEPROM 2-Wire Bus Interface

August 1999
NM24C04U/NM24C05U
4K-Bit Serial EEPROM
2-Wire Bus Interface
General Description
The NM24C04U/05U devices are 4K (4,096) bit serial interface
CMOS EEPROMs (Electrically Erasable Programmable Read-
Only Memory). These devices fully conform to the Standard 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.
NM24C05U 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
continuously reliable non-volatile solution for all markets.
Functions
I I²C™ compatible interface
I 4,096 bits organized as 512 x 8
I Extended 2.7V – 5.5V operating voltage
I 100 KHz or 400 KHz operation
I Self timed programming cycle (6ms typical)
I "Programming complete" indicated by ACK polling
I NM24C05U: Memory "Upper Block" Write Protect pin
Features
I The I²C™ interface allows the smallest I/O pincount of any
EEPROM interface
I 16 byte page write mode to minimize total write time per byte
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
Block Diagram
VCC
VSS
WP
SDA
SCL
START
STOP
LOGIC
SLAVE ADDRESS
REGISTER &
COMPARATOR
CONTROL
LOGIC
XDEC
H.V. GENERATION
TIMING &CONTROL
E2PROM
ARRAY
A2
WORD
A1
ADDRESS
COUNTER
R/W
YDEC
CK
DIN
DATA REGISTER
DOUT
I²C™ is a registered trademark of Philips Electronics N.V.
© 1999 Fairchild Semiconductor Corporation
1
NM24C04U/NM24C05U Rev. C.1
DS800008-1
www.fairchildsemi.com