BA8274 View Datasheet(PDF) - ROHM Semiconductor

Part Name

Description

Manufacturer

BA8274

I2C bus line buffer IC

ROHM Semiconductor 

Audio ICs

BA8274 / F

zCircuit operation

BA8274/F contains two identical buffer circuits which enable I2C and similar bus systems to be extended over long

distances without degradation of system performance or requiring the use of special cables.

The buffer has an effective current gain of about 10 from I2C bus to buffered bus. When current is flowing out of the I2C

bus side, about 10 times that current will be flowing into the buffered bus side (See Fig.2).

As a consequence of this amplification the system is able to drive capacitive load up to about 6 times the standard limit on

the buffered bus side. This current based buffering approach preserves the bi-directional, open collector / open-drain

characteristic of the I2C SDA/SCL lines.

To minimize interference and ensure stability, current rise and fall rates are internally controlled.

VCC

I

I2C BUS

SX

CURRENT

SENSE

10×I BUFFERED BUS

LX

GND

zApplication circuit

VCC

150

Fig.2

µ-COM

8

7

6

5

Buffer

Buffer

1

2

3

4

150

µ-COM

Fig.3

4/8

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