接口信号缓NXP(恩智浦)

P82B96TD 

SOP-8

1. General description The 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 I 2C-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. It achieves this interface without any restrictions on the normal I2C-bus protocols or clock speed. The IC adds minimal loading to the I2C-bus node, and loadings of the new bus or remote I2C-bus nodes are not transmitted or transformed to the local node. Restrictions on the number of I2C-bus devices in a system, or the physical separation between them, are virtually eliminated. Transmitting SDA and SCL signals via balanced transmission lines (twisted pairs) or with galvanic isolation (opto-coupling) is simple because separate directional Tx and Rx signals are provided. The Tx and Rx signals may be directly connected, without causing latching, to provide an alternative bidirectional signal line with I 2C-bus properties. 2. Features ■ 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. ■ Low power supply current ■ ESD protection exceeds 3500 V HBM per JESD22-A114, 250 V DIP package, 400 V SO package MM per JESD22-A115, and 1000 V CDM per JESD22-C101 ■ Latch-up free (bipolar process with no latching structures) ■ Packages offered: DIP8, SO8 and TSSOP8