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NM24C04U Datasheet

  • NM24C04U

  • EEPROM 2-Wire Bus Interface

  • 13頁

  • FAIRCHILD

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NM24C04U/NM24C05U 鈥?4K-Bit Serial 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
I
2
C鈩?/div>
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
I
2
C鈩?compatible interface
I
4,096 bits organized as 512 x 8
I
Extended 2.7V 鈥?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 I
2
C鈩?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 200碌A(chǔ) active current (I
CCA
)
I
Typical 1碌A(chǔ) standby current (I
SB
) for "L" devices and 0.1碌A(chǔ)
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
H.V. GENERATION
TIMING &CONTROL
START
STOP
LOGIC
CONTROL
LOGIC
SLAVE ADDRESS
REGISTER &
COMPARATOR
E2PROM
ARRAY
SDA
SCL
XDEC
A2
A1
WORD
ADDRESS
COUNTER
R/W
YDEC
CK
DIN
DATA REGISTER
DOUT
I
2
C鈩?is a registered trademark of Philips Electronics N.V.
DS800008-1
漏 1999 Fairchild Semiconductor Corporation
NM24C04U/NM24C05U Rev. C.1
1
www.fairchildsemi.com

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