IS31IO7325-GRLS4

Overview

The IS31IO7325 is a multi-function I/O driver featuring sixteen configurable ports, divided into eight push-pull and eight open-drain outputs. It operates on a 400kHz I2C serial interface with a supply voltage range of 2.4V to 5.5V. The device supports selectable power-up default logic states via address inputs AD0 and AD1. Open-drain outputs sink 20mA at 0.28V headroom. Transition detection on input ports triggers an active-low latched interrupt (INTB). Standby current is typically 0.3μA. Operating temperature ranges from -40°C to +125°C.

Feature Summary

• Configurable I/O architecture with mixed push-pull and open-drain capabilities
• Latching transition detection with active-low interrupt output
• Selectable power-up logic states determined by hardware address pins
• Low standby current consumption during idle periods

Applications

• Cell phones
• Notebooks
• Servers
• Automotive systems

Procurement Notes

Verify the specific ordering suffix against official Lumissil documentation to confirm package type and reel quantity. Ensure the selected variant matches the required industrial temperature range and RoHS compliance standards for the target application environment.

Selection Notes

Select this component when a system requires sixteen general-purpose I/O lines accessible via a standard two-wire serial bus. Verify that the host controller supports the 400kHz I2C clock frequency and can handle the required pull-up resistor configurations for SDA and SCL lines.

Part Context

This part belongs to the IS31IO series of multi-function I/O drivers manufactured by Lumissil Microsystems. These devices are designed to expand microcontroller I/O capabilities in space-constrained applications requiring reliable digital signal control and monitoring.

Replacement Considerations

Check datasheets for other members of the IS31IO family or similar I/O expanders from Lumissil. Confirm pinout compatibility and register mapping before substituting to ensure functional equivalence without PCB redesign.

FAQ

How does the IS31IO7325 determine its initial I/O port states?

The power-up default logic states for the I/O ports are determined by the voltage levels applied to the address select inputs AD0 and AD1.

What mechanism clears the pending interrupt flag?

The latched interrupt is cleared when the master reads the corresponding input/output port registers through the serial interface.

Can the open-drain outputs perform level translation?

Yes, the open-drain architecture allows for level translation to higher or lower voltages than the VCC supply by connecting a pull-up resistor to the desired voltage rail.