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I2C Port Expander with 8 Open-Drain I/Os

An 8 Push-Pull Output GPIO/LED Driver with an RST Input Software Compatible with the MAX7324, MAX7325, MAX7326 and MAX7327 (16-Port GPIOs)

Product Details

Key Features

Parametric specs for I/O Port Expanders
Interface Serial 2-Wire 400kbit
I/O 8
Reset Input Yes
Interrupt Output Yes
Over Voltage Protection (V) 6
Drive Current (mA) 20
VSUPPLY (V) (min) 1.71
VSUPPLY (V) (max) 5.5
Package/Pins QSOP/16
TQFN/16
Budgetary
Price (See Notes)
1.31
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Simplified Block Diagram

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Parameters

Parametric specs for I/O Port Expanders
Interface Serial 2-Wire 400kbit
I/O 8
Reset Input Yes
Interrupt Output Yes
Over Voltage Protection (V) 6
Drive Current (mA) 20
VSUPPLY (V) (min) 1.71
VSUPPLY (V) (max) 5.5
Package/Pins QSOP/16
TQFN/16
Budgetary
Price (See Notes)
1.31

Key Features

  • 400kHz I2C Serial Interface
  • +1.71V to +5.5V Operating Voltage
  • 8 Open-Drain I/O Ports Rated to 20mA Sink Current
  • I/O Ports Are Overvoltage Protected to +6V
  • Any Port Can Be a Logic Input or an Open-Drain Output
  • Selectable I/O Port Power-Up Default Logic States
  • Transient Changes Are Latched, Allowing Detection Between Read Operations
  • active-low INT Output Alerts Change on Inputs
  • AD0 and AD2 Inputs Select from 16 Slave Addresses
  • Low 0.6µA (typ) Standby Current
  • -40°C to +125°C Operating Temperature

Applications/Uses

  • Cell Phones
  • Notebooks
  • SAN/NAS
  • Satellite Radio
  • Servers

Description

The MAX7321 2-wire serial-interfaced peripheral features eight open-drain I/O ports with selectable internal pullups and transition detection. Any port may be used as a logic input or an open-drain output. Ports are overvoltage protected to +6V independent of supply voltage.

All I/O ports configured as inputs are continuously monitored for state changes (transition detection). State changes are indicated by the open-drain, active-low INT output. The interrupt is latched, allowing detection of transient changes. When the MAX7321 is subsequently accessed through the serial interface, any pending interrupt is cleared.

The open-drain outputs are rated to sink 20mA and are capable of driving LEDs.

The +6V tolerant active-low RST input clears the serial interface, terminating any I2C communication to or from the MAX7321.

The MAX7321 uses two address inputs with four-level logic to allow 16 I2C slave addresses. The slave address also determines the power-up logic state for the I/O ports, and enables or disables internal 40kΩ pullups in groups of four ports.

The MAX7321 is one device in a family of pin-compatible port expanders with a choice of input ports, open-drain I/O ports, and push-pull output ports.

The MAX7321 is available in 16-pin QSOP and TQFN packages, and is specified over the automotive temperature range (-40°C to +125°C).

Simplified Block Diagram

MAX7321: Typical Operating Circuit MAX7321: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .