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FM34W02UE 데이터시트(PDF) 1 Page - Fairchild Semiconductor

부품명 FM34W02UE
상세설명  2K-Bit Standard 2-Wire Bus Interface Serial EEPROM with Full Array Write Protect
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제조업체  FAIRCHILD [Fairchild Semiconductor]
홈페이지  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

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FM34W02U Rev. A.1
© 2001 Fairchild Semiconductor Corporation
FM34W02U
2K-Bit Standard 2-Wire Bus Interface Serial EEPROM
with Full Array Write Protect
Designed with Permanent Write-Protection for First 128 Bytes for Serial Presence
Detect Application on Memory Modules (PC100/PC133 Compliant)
General Description
The FM34W02U is 2048 bits of CMOS non-volatile electrically
erasable memory. This device is specifically designed to support
Serial Presence Detect circuitry in memory modules. This com-
munications protocol uses CLOCK (SCL) and DATA I/O (SDA)
lines to synchronously clock data between the master (for ex-
ample a microprocessor) and the slave EEPROM device(s).
The contents of the non-volatile memory allows the CPU to
determine the capacity of the module and the electrical character-
istics of the memory devices it contains. This will enable "plug and
play" capability as the module is read and PC main memory
resources utilized through the memory controller.
The first 128 bytes of the memory of the FM34W02U can be
permanently Write Protected by writing to the "WRITE PROTECT"
Register. Write Protect implementation details are described
under the section titled Addressing the WP Register.
The FM34W02U is available in a JEDEC standard TSSOP pack-
age for low profile memory modules for systems requiring efficient
space utilization such as in a notebook computer. Two options are
available: L - Low Voltage and LZ - Low Power, allowing the part
to be used in systems where battery life is of primary importance.
Block Diagram
Features
I PC100/PC133 Compliant
I Extended Operating Voltage: 2.7V-5.5V
I Software Write-Protection for first 128 bytes
I Hardware Write-Protection for entire memory array
I 200 µA active current typical
– 1.0
µA standby current typical (L)
– 0.1
µA standby current typical (LZ)
I IIC compatible interface
– Provides bidirectional data transfer protocol
I Sixteen byte page write mode
– Minimizes total write time per byte
I Self timed write cycle
- Typical write cycle time of 6ms
I Endurance: 1,000,000 data changes
I Data retention greater than 40 years
I Packages available: 8-pin TSSOP and 8-pin SO
I Temperature Ranges: Commercial and Extended
H.V. GENERATION
TIMING &CONTROL
E2PROM
ARRAY
16 x 16 x 8
16
YDEC
8
DATA REGISTER
XDEC
CONTROL
LOGIC
WORD
ADDRESS
COUNTER
SLAVE ADDRESS
REGISTER &
COMPARATOR
START
STOP
LOGIC
START CYCLE
16
4
4
CK
DIN
R/W
LOAD
INC
SDA
VSS
VCC
WP
DOUT
A2
A1
A0
Device Address Bits
0/1/2/3
SCL
Write Protect
Register
May 2001


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