TCA9536DTMR

Overview

The TCA9536DTMR is a remote 4-bit I/O expander for the I2C bus and SMBus, manufactured by Texas Instruments. It operates within a supply voltage range of 1.65 V to 5.5 V and supports Fast mode plus clock frequencies up to 1 MHz. The device features five-volt tolerant I/O ports and includes configuration registers, input/output data registers, and a polarity inversion register. It provides an open-drain interrupt output capability when pin P3 is repurposed via the special function register. The component is housed in an 8-pin X2SON package with dimensions of 1.35 mm by 0.80 mm.

Feature Summary

• Supports software reset via I2C general call command
• Features software-enabled integrated pull-up resistors on P ports
• Includes internal power-on reset mechanism
• Provides noise filtering on SCL and SDA inputs

Applications

• Wearable electronics
• Mobile phones
• Gaming consoles
• Servers
• Routers

Procurement Notes

Verify the specific ordering suffix DTMR corresponds to the X2SON-8 package and tape-and-reel delivery format as defined in the manufacturer's orderable addendum. Confirm that the revision level matches the production data status indicated in the datasheet documentation. Ensure compatibility with the target system's I2C address configuration requirements before finalizing procurement.

Selection Notes

Select this component when a compact 4-bit expansion solution is required for low-voltage systems operating down to 1.65 V. The X2SON package is suitable for space-constrained designs. Consider the interrupt functionality if edge-detection capabilities are needed. Verify that the 1-MHz Fast mode plus speed meets the system's communication bandwidth requirements compared to standard I2C speeds.

Part Context

The TCA9536 belongs to the family of remote I/O expanders designed for microcontroller interface extension. It serves as a peripheral device to increase the number of available general-purpose input and output lines on a host processor. The DTM suffix specifically denotes the 8-pin X2SON package variant, distinguishing it from other package options like VSSOP available within the same functional series.

Replacement Considerations

The PCA9536DR is a comparable alternative offering similar I2C expansion functionality. Note that the PCA9536DR utilizes an SOIC-8 package and lacks the interrupt output feature present in the TCA9536. Additionally, the PCA9536DR has a minimum operating voltage of 2.3 V, which differs from the 1.65 V lower limit of the TCA9536.