Analogue, Mixed Signal, LSI


I²C bus buffers

22 February 2012 Analogue, Mixed Signal, LSI

New from Linear Technology are the LTC4313 and LTC4315 high noise margin buffers that provide capacitance buffering and bus extension capabilities to I²C/SMBus/PMBus systems. As the number of devices on an I²C bus expands, additive capacitances can critically lengthen rise times. The new ICs alleviate this problem by segmenting the bus and offer the additional advantage of high logic low noise margin, thanks to their guaranteed minimum VIL of 0,3*VCC. This allows the devices to operate with noncompliant I²C devices that drive a high logic low output voltage (VOL). This also permits a number of chips to be connected in series, and improves the reliability of I²C communications in large noisy systems.



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