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I²C Port Expander with 12 Push-Pull Outputs and 4 Open-Drain I/Os

Product Details

Key Features

Parametric specs for I/O Port Expanders
Interface Serial - I2C Compatible
Serial 2-Wire 400kbit
Outputs 12
I/O 4
Reset Input Yes
Interrupt Output Yes
Over Voltage Protection (V) 6
Drive Current (mA) 25
VSUPPLY (V) (min) 1.71
VSUPPLY (V) (max) 5.5
Package/Pins TQFN/24
Budgetary
Price (See Notes)
2.14
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Simplified Block Diagram

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Parameters

Parametric specs for I/O Port Expanders
Interface Serial - I2C Compatible
Serial 2-Wire 400kbit
Outputs 12
I/O 4
Reset Input Yes
Interrupt Output Yes
Over Voltage Protection (V) 6
Drive Current (mA) 25
VSUPPLY (V) (min) 1.71
VSUPPLY (V) (max) 5.5
Package/Pins TQFN/24
Budgetary
Price (See Notes)
2.14

Key Features

  • 400kHz I²C Serial Interface
  • +1.71V to +5.5V Operating Voltage
  • 12 Push-Pull Output Ports, Rated at 20mA Sink Current
  • 4 Open-Drain I/O Ports, Rated at 20mA Sink Current
  • I/O Ports are Overvoltage Protected to +6V
  • Selectable I/O Port Power-Up Default Logic States
  • Transient Changes are Latched, Allowing Detection Between Read Operations
  • Active-Low INT Output Alerts Changes on Inputs
  • AD0 and AD2 Inputs Select from 16 Slave Addresses
  • Low 0.6&#181A (typ) Standby Current
  • -40°C to +125°C Temperature Range

Applications/Uses

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

Description

The MAX7327, a 2-wire serial-interfaced peripheral, features 12 push-pull outputs and four configurable open-drain I/O ports with selectable internal pullups and transition detection. Ports are overvoltage protected to +6V, independent of supply voltage.

The four I/O ports configured as inputs are continuously monitored for state changes (transition detection). State changes are indicated by the open-drain, +6V-tolerant active-low INT output. The interrupt is latched, detecting transient changes. When the MAX7327 is subsequently accessed through the serial interface, any pending interrupt is cleared. The 12 push-pull and the four open-drain outputs are rated to sink 20mA, and are capable of driving LEDs. The active-low RST input clears the serial interface, terminating any I²C communication to or from the MAX7327.

The MAX7327 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 two ports.

The MAX7327 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 (see Table 1 in the full data sheet).

The MAX7327 is available in the 24-pin QSOP and TQFN packages, and is specified over the -40°C to +125°C automotive temperature range.

Simplified Block Diagram

MAX7327: Typical Application Circuit MAX7327: Typical Application 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 .