BU9877FV データシートの表示（PDF） - ROHM Semiconductor

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BU9877FV

Serial interface IC for DIMMs supporting plug & play

ROHM Semiconductor 

Memory ICs

•Block diagram

BU9877FV

A0 1

A1 2

A2 3

GND 4

8bit

Address

Decoder

2048bit EEPROM Array

8bit

Slave · word

Address Register

START

STOP

Control Circuit

Write Protect Control Circuit

High voltage generator

Power supply voltage detector

8bit

Data

Register

ACK

8 Vcc

7 WP

6 SCL

5 SDA

•Pin descriptions

Pin No.

Pin name

1, 2, 3

A0, A1, A2

4

GND

5

SDA

6

SCL

7

WP

8

VCC

I/O

Function

I

Slave address setting (pin)

—

Input / output reference voltage of 0V

I/O

Slave and word address, serial data input / output

I

Serial clock input

I

Write protect input

—

Connect the power supply to this.

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 5.5V)

Parameter

Symbol Min. Typ. Max. Unit

Conditions

Input high level voltage

VIH

0.7VCC

—

—

V

—

Input low level voltage

VIL

—

—

0.3VCC

V

—

Output low level voltage VOL

—

—

0.4

V

IOL = 3.0mA (SDA)

Input leakage current 1

ILI 1

–1

—

1

µA

VIN = 0V ~ VCC

Input leakage current 2

ILI 2

–1

—

20

µA

VIN = 0V ~ VCC (WP)

Output leakage current

ILO

–1

—

1

µA

VOUT = 0V ~ VCC

Operating current

consumption

ICC

—

—

3.0

mA VCC = 5.5V, fSCL = 100kHz

Standby current

ISB

—

—

2.0

µA VCC = 5.5V, SDA · SCL = VCC

SCL frequency

fSCL

—

—

100

kHz

—

Measurement circuit

—

—

Fig.1

Fig.2

Fig.2

Fig.2

Fig.3

Fig.4

—

2

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