PCA9540B - NXP

PCA9540B 2-channel I2C-bus multiplexer

The PCA9540B is a 1-of-2 bidirectional translating multiplexer, controlled via the I2C-bus. The SCL/SDA upstream pair fans out to two SCx/SDx downstream pairs, or channels. Only one SCx/SDx channel is selected at a time, determined by the contents of the programmable control register. A power-on reset function puts the registers in their default state and in.

Features

 1-of-2 bidirectional translating multiplexer
 I2C-bus interface logic; compatible with SMBus standards
 Channel selection via I2C-bus
 Power-up with all multiplexer channels deselected
 Low Ron switches
 Allows voltage level translation between 1.8 V, 2.5 V, 3.3 V and 5 V buses
 No glitch on power-up
 Supports hot insertion
 Low standby current
 Operating power supply voltage range of 2.3 V to 5.5 V
 5 V tolerant inputs
 0 Hz to 400 kHz clock frequency
 ESD protection exceeds 2000 V HBM per JESD22-A114, and 1000 V CDM per JESD22-C101
 Latch-up testing is done to JEDEC Standard J.