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MAX7327：I²C Port Expander with 12 Push-Pull Outputs and 4 Open-Drain I/Os

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.

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 0.6µA (typ) Standby Current -40°C to +125°C Temperature Range

MAX7327: Typical Application Circuit Applications/Uses Cell Phones Notebooks SAN/NAS Satellite Radio Servers

DataSheet

Parametrics

Design kits & evaluation modules

• MAX7327EVCMAXQU
• MAX7327EVKIT

Related Products

• MAX7323：I²C Port Expander with 4 Push-Pull Outputs and 4 Open-Drain I/Os
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• MAX7320：I²C Port Expander with Eight Push-Pull Outputs
• MAX7328：I²C Port Expanders with Eight I/O Ports
• MAX7329：I²C Port Expanders with Eight I/O Ports
• MAX7319：I²C Port Expander with Eight Inputs and Maskable Transition Detection
• MAX7321：I2C Port Expander with 8 Open-Drain I/Os

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