BU9877FV

Memory ICs Serial interface IC for DIMMs supporting plug & play BU9877FV The BU9877FV is a 2-k bit EEPROM with a write protect function, developed for DIMMs (Dual In-line Memory Modules) containing a synchronous DRAM. This IC stores IDs in memory in order to enable Plug & Play functions. Applications 168-pin and 144-pin DRAM modules containing synchronous DRAM Features 1) 2-k bit EEPROM with configuration of 256 words × 8 bits. 2) Compliance with SPD data format. 3) Dual-line serial (I2C bus) interface. 4) Protective functions enabled by a one-time ROM and write protect pin. Soft ware protection. as a one-time ROM: 00 to 7Fh. Hard ware protection (WP pin): 80 to FFh. 5) Compact SSOP-B 8-pin package. Absolute maximum ratings (Ta = 25°C) Parameter Applied voltage Power dissipation Storage temperature Operating temperature Input voltage Symbol VCC Pd Tstg Topr — Limits – 0.3 ~ + 7.0 300∗ – 65 ~ + 125 – 40 ~ + 85 – 0.3 ~ VCC + 0.3 Unit V mW °C °C V ∗1 Reduced by 3.0mW for each increase in Ta of 1°C over 25°C. Recommended operating conditions (Ta = 25°C) Parameter Power supply voltage Input voltage Symbol VCC VIN Limits 2.7 ~ 5.5 0 ~ VCC Unit V V 1 Memory ICs BU9877FV Block diagram A0 1 2048bit EEPROM Array 8 Vcc 8bit 8bit A1 2 Address Decoder 8bit Slave · word Address Register Data Register 7 WP START A2 3 Control Circuit STOP 6 SCL Write Protect Control Circuit GND 4 High voltage generator Power supply voltage detector ACK 5 SDA Pin descript...