Ultra-Low-Voltage Translating 24-Bit Fm+ I²C-Bus/SMBus I/O Expander


Product Details


Key Features

  • I²C-bus to parallel port expander
  • 1 MHz Fast-mode Plus I²C-bus
  • Operating power supply voltage range of 0.8 V to 3.6 V on the I²C-bus side
  • Allows bidirectional voltage-level translation and GPIO expansion between 0.8 V to 3.6 V SCL/SDA and 1.8 V, 2.5 V, 3.3 V, 5.5 V Port P
  • Low standby current consumption: 2.0 µA typical at 3.3 V VDD(P)
  • Schmitt trigger action allows slow input transition and better switching noise immunity at the SCL and SDA inputs
    • Vhys = 0.05 V (typical) at 0.8 V
    • Vhys = 0.18 V (typical) at 1.8 V
    • Vhys = 0.33 V (typical) at 3.3 V
  • 5.5 V tolerant I/O ports and 3.6 V tolerant I²C-bus pins
  • Active LOW reset input (RESET)
  • Open-drain active LOW interrupt output (INT)
  • Internal power-on reset
  • Noise filter on SCL/SDA inputs
  • Latched outputs with 25 mA drive maximum capability for directly driving LEDs
  • Latch-up performance exceeds 100 mA per JESD 78, Class II
  • Output port configuration: bank selectable or pin selectable push-pull or open-drain output stages
  • Interrupt status: read-only register identifies the source of an interrupt
  • Interrupt edge specification on a bit-by-bit basis
  • Interrupt individual clear without disturbing other events
  • Read all interrupt events without clear
  • Switch debounces hardware
  • General call software reset
  • I²C software Device ID function

ESD Protection Exceeds JESD 22

  • 2000 V Human-Body Model (A114-A)
  • 1000 V Charged-Device Model (C101)


  • TSSOP32
  • HUQFN32
  • VFBGA36

Bit-Wise I/O Programming Features

  • Output drive strength: four programmable drive strengths to reduce rise and fall times in low-capacitance applications
  • Input latch: Input Port register values changes are kept until the Input Port register is read
  • Pull-up/pull-down enable: floating input or pull-up/pull-down resistor enable
  • Pull-up/pull-down selection: 100 kΩ pull-up/pull-down resistor selection
  • Interrupt mask: mask prevents the generation of the interrupt when input changes state to prevent spurious interrupts

Product Longevity Program

Part numbers include: PCAL6524HE, PCAL6524EV.


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