XRA1200IL16-F

Overview

The XRA1200IL16-F is an 8-bit I/O port expander featuring an I2C/SMBus interface, manufactured by MaxLinear. It operates within a supply voltage range of 1.65V to 3.6V and supports clock frequencies up to 400kHz. The device provides 8 General Purpose I/Os (GPIOs) with individually programmable inputs and outputs, including internal pull-up resistors and polarity inversion capabilities. It features an open-drain active-low interrupt output and supports up to 32 slave addresses via A0-A2 pins. The component is housed in a 16-pin QFN package with an exposed thermal pad and functions reliably across an operating temperature range of -40°C to +85°C.

Feature Summary

• Supports Standard-mode and Fast-mode I2C/SMBus communication protocols with noise filtering on SDA and SCL lines.
• Provides individually configurable GPIOs capable of high, low, or three-state output modes for flexible system integration.
• Features an open-drain active-low interrupt output that can be programmed for rising edge, falling edge, or both-edge triggering.
• Includes internally programmable pull-up resistors and input polarity inversion for each individual I/O pin.

Applications

• Personal Digital Assistants (PDA)
• Cellular Phones and Data Devices
• Battery-Operated Devices
• Global Positioning System (GPS) Modules
• Bluetooth Communication Interfaces

Procurement Notes

Verify the specific ordering suffix 'IL16' confirms the 16-pin QFN package variant rather than the TSSOP option. Confirm the absence of the 'P' suffix indicates standard power-up behavior where internal pull-ups are disabled by default, unlike the XRA1200P series. Ensure the component status is checked as current production, noting that older revisions may list different manufacturers such as Exar Corporation.

Selection Notes

Select this component when an 8-bit expansion solution is required with low standby current consumption and support for multiple slave addresses on a single bus. Consider the XRA1200P variant if automatic internal pull-up activation upon power-up is necessary for input state safety. Verify that the target application voltage falls within the 1.65V to 3.6V range and that the I2C bus speed requirements do not exceed 400kHz.

Part Context

The XRA1200/1200P series serves as an enhanced version of earlier 8-bit GPIO expanders, offering improved compatibility with industry-standard devices. It maintains pin and software compatibility with the CAT9534, PCA9534, CAT9554, and PCA9554 families. This design allows for direct replacement in existing designs utilizing those legacy components without requiring schematic or firmware modifications.

Replacement Considerations

Pin and software compatible replacements include CAT9534, PCA9534, CAT9554, PCA9554, PCA9554A, and TCA9554A.

FAQ

How does the XRA1200 handle internal pull-up resistors after power-up?

For the XRA1200 variant, internal pull-up resistors are disabled by default after power-up or reset. They must be explicitly enabled via the Input Internal Pull-up Enable/Disable Register (PUR). In contrast, the XRA1200P variant has these resistors enabled automatically upon power-up.

What determines the I2C slave address of the device?

The I2C slave address is determined by the logic levels applied to the A0, A1, and A2 address selection pins. These pins can be connected to VCC, GND, SDA, or SCL, allowing for up to 32 unique slave addresses to be configured on the same bus.

Can the interrupt output be cleared automatically?

Yes, the interrupt can be cleared by reading the GPIO State Register (GSR). Additionally, depending on the Interrupt Enable Register (IER) settings, the interrupt may clear automatically if the input changes back to its previous state or remains in the new state for more than 1075ns.