FM34W02UE

FM34W02U 2K-Bit Standard 2-Wire Bus Interface Serial EEPROM with Full Array Write Protect May 2001 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 communications protocol uses CLOCK (SCL) and DATA I/O (SDA) lines to synchronously clock data between the master (for example 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 characteristics 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 package 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. 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 Block Diagram VCC VSS WP START CYCLE SDA START STOP LOGIC CONTROL LOGIC SLAVE ADDRESS REGISTER & COMPARATOR LOAD A2 A1 A0 WORD ADDRESS COUNTER INC 16 XDEC E2PROM ARRAY 16 x 16 x 8 H.V. GENERATION TIMING &CONTROL SCL 0/1/2/3 4 4 16 R/W YDEC Device Address Bits Write Protect Register CK DIN 8 DOUT DATA REGISTER © 2001 Fairchild Semiconductor Corporation FM34W02U Rev. A.1 1 www.fairchildsemi.com FM34W02U 2K-Bit Standard 2-Wire Bus Interface Serial EEPROM with Full Array Write Protect Connection Diagram SO (M8) and TSSOP (MT8) Package A0 A1 A2 VSS 1 2 3 4 8 VCC WP SCL SDA FM34W02U 7 6 5 Top View See Package Number M08A and MTC08 Pin Names A0,A1,A2 VSS SDA SCL WP VCC Device Address Inputs Ground Data I/O Clock Input Write Protect Power Supply Ordering Information FM 34 W 02 U LZ E XX Package Temp. Range Voltage Operating Range M8 MT8 None E Blank L LZ U 02 W Interface 34 FM Letter Description 8-Pin SO8 8-Pin TSSOP 0 to 70°C -40 to +85°C 4.5V to 5.5V 2.7V to 5.5V 2.7V to 5.5V and