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BA8274 데이터시트 PDF




ROHM Semiconductor에서 제조한 전자 부품 BA8274은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

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부품번호 BA8274 기능
기능 I2C Bus Line Buffer IC
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BA8274 데이터시트, 핀배열, 회로
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Audio ICs
I2C bus line buffer IC
BA8274 / F
BA8274 / F
BA8274, BA8274F are buffer ICs that can lengthen the bus line retaining all features and operating mode of I2C bus
system. Adoption of this buffer in data and clock line enable to improve the drive capacity and to lengthen the bus line
with using standard wire at a low price.
zApplications
Mini-component stereo, Micro-component stereo and Television.
zFeatures
1) Dual, bi-directional, unity voltage gain buffer.
2) I2C bus compatible.
3) 1:10 impedance transformation.
4) Logic signal levels may include both supply and ground.
5) Power supply voltage range is large.
zAbsolute maximum ratings (Ta=25°C)
Parameter
Power supply voltage
Power dissipation
Operating temperature
Storage temperature
Symbol
VCC
Pd
Topr
Tstg
Limits
13.0
∗∗
800 / 550
40 to +85
55 to +125
For Ta=25°C or more it is reduced at 5.5mW/°C(SOP), 8.0mW/°C (DIP).
Unit
V
mW
°C
°C
zRecommended operating conditions (Ta=25°C)
Parameter
Symbol Min.
Power supply voltage VCC
4.5
Typ.
Max.
12
Unit
V
I2C bus is a trademark of Philips.
1/8




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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 76
Buffer
5
Buffer
12
150
3
µ-COM
Fig.3
4
4/8

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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:
(50.4)V = 17.6mA < 30mA
260
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
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