Four-Channel I2C-Bus Switch with Interrupt Logic and Reset

Product Details

Block Diagram


PCA9545A_45B_45C Block Diagram


Key Features

  • 1-of-4 bidirectional translating switches
  • I2C-bus interface logic; compatible with SMBus standards
  • 4 active LOW interrupt inputs
  • Active LOW interrupt output
  • Active LOW reset input
  • 2 address pins allowing up to 4 devices on the I2C-bus
  • Alternate address versions A, B and C allow up to a total of 12 devices on the bus for larger systems or to resolve address conflicts
  • Channel selection via I2C-bus, in any combination
  • Power-up with all switch 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 protection exceeds 100 mA per JESD78
  • Three packages offered: SO20, TSSOP20, and HVQFN20

Part numbers include: PCA9545ABS, PCA9545AD, PCA9545APW.


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Design Files

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