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BU9877FV

Serial interface IC for DIMMs supporting plug & play

ROHM Semiconductor 

Memory ICs

Serial interface IC for DIMMs sup-

porting 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 syn-

chronous 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

Symbol

Limits

Unit

Applied voltage

Power dissipation

VCC

– 0.3 ~ + 7.0

V

Pd

300∗

mW

Storage temperature

Tstg

– 65 ~ + 125

°C

Operating temperature

Topr

– 40 ~ + 85

°C

Input voltage

—

– 0.3 ~ VCC + 0.3

V

∗1 Reduced by 3.0mW for each increase in Ta of 1°C over 25°C.

•Recommended operating conditions (Ta = 25°C)

Parameter

Symbol

Limits

Unit

Power supply voltage

VCC

2.7 ~ 5.5

V

Input voltage

VIN

0 ~ VCC

V

1

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