BA8274 データシートの表示（PDF） - ROHM Semiconductor

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BA8274

I2C bus line buffer IC

ROHM Semiconductor 

Audio ICs

BA8274 / F

Note): R1, R2 and R3 are calculated from the capacitive loading and a 1µsec time constant on each bus node. For an

addition to an existing system, R2 (the new value for R2) is shown as being calculated from the parallel

combination of R2 and the scaled value of R3; while for a permanent system R2, and scaled values of R1 and

R3 have been used. Note that this example has used scaled resistor values and combined the node and cable

capacitances.

Check for maximum pull-up current:

(5−0.4)V = 17.6mA < 30mA

260Ω

zOperation notes

1. About operation voltage supply range

Within operation voltage supply range, basic circuit function operation is guaranteed within operation ambient temp.

But please confirm set up of constant and element, voltage set up and temp set up on use.

2. About operation temp range

If it within recommended operation voltage range, circuit function operation is guaranteed within operation temp.

It corralled to conditions of power dissipation to temp.

Please watch out except condition stipulated by electrical characteristics within the range, it cannot guarantee standard

value of electrical characteristics. But it retains original function.

3. SX, SY, I2C BUS, SDA or SCL

Because the two buffer circuits in the BA8274/F are identical either input pin can be used as the I2C BUS SDA data

line,

or the SCL clock line.

4. LX, LY, Buffered bus, LDA or LCL

On the buffered low impedance line side, the corresponding output becomes LDA and LCL.

zElectrical characteristic curves

0.1

0.09

0.08

0.07

0.06

0.05

0.04

0.03

0.02

0.01

0

0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4

S PIN VOLTAGE VSX, VSY : (V)

Fig.5 S pin voltage-drive current ILX, ILY

7/8

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