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FM25C020UV Datasheet

  • FM25C020UV

  • 2K-Bit SPI⑩ Interface Serial CMOS EEPROM

  • 11頁(yè)

  • FAIRCHILD

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FM25C020U 2K-Bit SPI Interface Serial CMOS EEPROM
February 2002
FM25C020U
2K-Bit SPI鈩?Interface
Serial CMOS EEPROM
General Description
The FM25C020U is a 2K (2,048) bit serial interface CMOS
EEPROM (Electrically Erasable Programmable Read-Only
Memory). This device fully conforms to the SPI 4-wire protocol
which uses Chip Select (/CS), Clock (SCK), Data-in (SI) and Data-
out (SO) pins to synchronously control data transfer between the
SPI microcontroller and the EEPROM. In addition, 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.
This SPI EEPROM family is designed to work with the 68HC11 or
any other SPI-compatible, high-speed microcontroller and offers
both hardware (/WP pin) and software ("block write") data protec-
tion. For example, entering a 2-bit code into the STATUS REGIS-
TER prevents programming in a selected block of memory and all
programming can be inhibited by connecting the /WP pin to V
SS
;
allowing the user to protect the entire array or a selected section.
In addition, SPI devices feature a /HOLD pin, which allows a
temporary interruption of the datastream into the EEPROM.
Fairchild EEPROMs are designed and tested for applications
requiring high endurance, high reliability, and low power con-
sumption for a continuously reliable non-volatile solution for all
markets.
Functions
I
SPI MODE 0 interface
I
2,048 bits organized as 256 x 8
I
Extended 2.7V to 5.5V operating voltage
I
2.1 MHz operation @ 4.5V - 5.5V
I
Self-timed programming cycle
I
"Programming complete" indicated by STATUS REGISTER
polling
I
/WP pin and BLOCK WRITE protection
Features
I
Sequential read of entire array
I
4 byte "Page write" mode to minimize total write time per
byte
I
/WP pin and BLOCK WRITE protection to prevent inadvert-
ent programming as well as programming ENABLE and
DISABLE opcodes.
I
/HOLD pin to suspend data transfer
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
/CS
/HOLD
SCK
SI
Instruction
Register
Instruction
Decoder
Control Logic
and Clock
Generators
V
CC
V
SS
/WP
Address
Counter/
Register
Program
Enable
V
PP
High Voltage
Generator
and
Program
Timer
Decoder
EEPROM Array
Read/Write Amps
Data In/Out Register
8 Bits
Data Out
Buffer
SO
Non-Volatile
Status Register
SPI鈩?is a trademark of Motorola Corporation
漏 2002 Fairchild Semiconductor Corporation
FM25C020U Rev. B
1
www.fairchildsemi.com

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