PCA9501D,112

I/o Expanders Overview

The PCA9501D,112 is an 8-bit I/O expander with integrated 2-kbit EEPROM. It features eight quasi-bidirectional data pins and supports I2C-bus and SMBus interfaces. The device operates within a supply voltage range of 2.5 V to 3.6 V and supports clock frequencies up to 400 kHz. It includes six hardware address pins allowing up to 64 devices on the bus. The package is SO20 (SOT163-1) with an operating temperature range of -40 °C to +85 °C.

I/o Expanders Feature Summary

• Integrated 2-kbit EEPROM for board version tracking and configuration storage
• Active LOW open-drain interrupt output for input state change detection
• Supports hot insertion and power-up with all channels configured as inputs
• Internal pull-up resistors on address pins and noise filters on SCL/SDA inputs

I/o Expanders Applications

• Board version tracking and configuration
• Multi-card systems in telecom and networking infrastructure
• Field recall and troubleshooting functions for installed boards

I/o Expanders Procurement Notes

Verify the ordering suffix matches the required package type. Confirm the manufacturer designation aligns with NXP Semiconductors specifications. Ensure the component meets RoHS compliance requirements for the target application environment.

I/o Expanders Selection Notes

Select this component when an I/O expander with non-volatile memory is required. It serves as a drop-in replacement for PCF8574 while adding EEPROM capabilities. Consider the 20-pin SO package constraints and 3.6 V maximum supply voltage limits during design.

I/o Expanders Part Context

The PCA9501D belongs to the PCA9501 family, which also includes TSSOP20 and HVQFN20 variants. The 'D' suffix specifically denotes the plastic small outline package (SO20). This family provides expanded addressing capabilities compared to standard 8-pin expanders.

I/o Expanders Replacement Considerations

PCA9501PW,118

I/o Expanders FAQ

How many devices can share the same I2C-bus?

Six address pins allow up to 64 PCA9501 devices to be located on the same I2C-bus or SMBus.

What is the function of the WC pin?

The Write Control (WC) pin must be set to a LOW logic level to enable write operations to the internal EEPROM. Setting it HIGH protects the memory data.

Does the device support hot insertion?

Yes, the PCA9501 supports hot insertion to facilitate usage in removable cards on backplane systems.