BU9877FV
BU9877FV is Serial interface IC for DIMMs supporting plug & play manufactured by ROHM.
Features
- 1) 2-k bit EEPROM with configuration of 256 words × 8 bits. 2) pliance 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) pact 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 m W °C °C V
∗1 Reduced by 3.0m W for each increase in Ta of 1°C over 25°C.
- Remended operating conditions (Ta = 25°C)
Parameter Power supply voltage Input voltage Symbol VCC VIN Limits 2.7 ~ 5.5 0 ~ VCC Unit V V
Memory ICs
- Block diagram
A0 1 2048bit EEPROM Array 8 Vcc
8bit
8bit
A1
Address Decoder
8bit
Slave
- word Address Register
Data Register
START A2 3 Control Circuit
STOP 6 SCL
Write Protect Control Circuit
4 High voltage generator Power supply voltage detector
- Pin descriptions
Pin No. 1, 2, 3 4 5 6 7 8 Pin name A0, A1, A2 GND SDA SCL WP VCC I/O I
- I/O I I
- Slave address setting (pin) Input / output reference voltage of 0V Slave and word address, serial data input / output Serial clock input Write protect input Connect the power supply to this. Function
Note: The SDA pin is Nch open drain output, and should be used with external pull-up resistor. The WP pin is equipped with internal pull-down resistor, so can be left open when used.
- Electrical characteristics (unless otherwise noted, Ta =
- 40 to + 85°C, Vcc = 2.7V to...
