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PCA9556 - Octal SMBus Registered Interface

General Description

The PCA9556 is a silicon CMOS circuit which provides parallel input/output expansion for SMBus applications.

The PCA9556 consists of an 8-bit input port register, 8-bit output port register, and an SMBus interface.

It has low current consumption and a high impedance open drain output pin, I/O0.

Key Features

  • SMBus compliance with fixed 3.3V voltage levels.
  • Operating power supply voltage range of 3.0V.
  • 3.6V.
  • Active high polarity inverter register.
  • Write protect register.
  • Active low reset pin.
  • Low leakage current on power-down.
  • Noise filter on SCL/SDA inputs.
  • No glitch on power-up.
  • Internal power-on reset.
  • 8 I/O pins which default to 8 inputs.
  • High impedance open drain on I/O.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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INTEGRATED CIRCUITS PCA9556 Octal SMBus Registered Interface Product specification 1998 Dec 18 Philips Semiconductors Philips Semiconductors Product specification Octal SMBus Registered Interface PCA9556 FEATURES • SMBus compliance with fixed 3.3V voltage levels • Operating power supply voltage range of 3.0V – 3.6V • Active high polarity inverter register • Write protect register • Active low reset pin • Low leakage current on power-down • Noise filter on SCL/SDA inputs • No glitch on power-up • Internal power-on reset • 8 I/O pins which default to 8 inputs • High impedance open drain on I/O DESCRIPTION The PCA9556 is a silicon CMOS circuit which provides parallel input/output expansion for SMBus applications.