P82B96TD,118

缓冲器和线路驱动器 DUAL BI-DIRECTIONAL BUS BUFFER

Dual bidirectional bus buffer

General description

The P82B96TD P82B96 is a bipolar IC that creates a non-latching, bidirectional, logic interface

between the normal I2C-bus and a range of other bus configurations. It can interface

I2C-bus logic signals to similar buses having different voltage and current levels.

For example, it can interface to the 350 μA SMBus, to 3.3 V logic devices, and to 15 V

levels and/or low-impedance lines to improve noise immunity on longer bus lengths.

Applications P82B96TD

■ Interface between I2C-buses operating at different logic levels (for example, 5 V and

3 V or 15 V)

■ Interface between I2C-bus and SMBus (350 μA) standard

■ Simple conversion of I2C-bus SDA or SCL signals to multi-drop differential bus

hardware, for example, via compatible PCA82C250

■ Interfaces with opto-couplers to provide opto-isolation between I2C-bus nodes up to

400 kHz

Features P82B96TD

■ Bidirectional data transfer of I2C-bus signals

■ Isolates capacitance allowing 400 pF on Sx/Sy side and 4000 pF on Tx/Ty side

■ Tx/Ty outputs have 60 mA sink capability for driving low-impedance or high capacitive

buses

■ 400 kHz operation over at least 20 meters of wire (see AN10148)

■ Supply voltage range of 2 V to 15 V with I2C-bus logic levels on Sx/Sy side

independent of supply voltage

■ Splits I2C-bus signal into pairs of forward/reverse Tx/Rx, Ty/Ry signals for interface

with opto-electrical isolators and similar devices that need unidirectional input and

output signal paths.

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