TXS02326RGER

Specialized Overview

The TXS02326RGER is a dual-supply 2:1 SIM card multiplexer and translator manufactured by Texas Instruments. It extends a single baseband SIM interface to support two individual subscriber identity modules. The device integrates high-speed level translation for Class-B (2.95 V) and Class-C (1.8 V) interfaces, alongside two independent low-dropout regulators providing selectable output voltages of 1.8 V or 2.95 V with up to 50 mA current capability. Configuration is managed via an I2C slave interface operating at 400 kb/s. Supply ranges include 1.7 V to 3.3 V for the I/O domain and 2.3 V to 5.5 V for battery input. It operates within a temperature range of -40°C to 85°C in a 24-pin QFN package.

Specialized Feature Summary

• Integrates dual low-dropout voltage regulators with selectable 1.8-V or 2.95-V outputs for independent SIM slot power management.
• Provides automatic detection and shutdown capabilities triggered by battery removal or dedicated shutdown inputs using programmable debounce counters.
• Supports bidirectional voltage level translation between baseband processors and smart cards across varying supply domains.
• Includes an integrated I2C control interface for register configuration, status monitoring, and dynamic switching between SIM slots.

Specialized Applications

• Mobile handset applications requiring dual SIM/UICC support
• Interfacing wireless baseband processors with multiple subscriber identity modules
• Standby smart identity module solutions for GSM and 3G mobile standards

Specialized Procurement Notes

Verify the specific ordering suffix RGE corresponds to the tape and reel packaging format required for automated assembly processes. Confirm that the exposed thermal pad on the QFN package is properly connected to ground in the layout design to ensure adequate thermal dissipation and electrical grounding as specified in the datasheet.

Specialized Selection Notes

Select this component when a system requires managing two distinct SIM cards from a single baseband interface without external multiplexing logic. Ensure the application supports the required I2C communication protocol for configuration. Verify that the available battery voltage falls within the 2.3 V to 5.5 V input range for the internal regulators.

Specialized Part Context

This part belongs to the TXS02326 family of dual-supply SIM multiplexers. The RGE suffix specifically denotes the 24-pin QFN package variant supplied in tape and reel format. It is designed to replace discrete transistor-based switching and translation circuits in compact mobile designs.

Specialized Replacement Considerations

Direct pin-to-pin replacements are not explicitly listed in the provided documentation. Evaluate other Texas Instruments SIM multiplexers or translators based on package compatibility and I2C register mapping if functional equivalence is required.

Specialized FAQ

How is the I2C slave address determined?

The I2C slave address is dynamically configured based on the logic state of the IRQ pin during the write cycle. Different states of the IRQ pin select one of four possible addresses.

What happens when the BSI input detects battery removal?

If enabled, the BSI input triggers an automatic shutdown sequence for both SIM interfaces after the debounce counter expires. An interrupt can also be generated on the IRQ pin if the battery removal interrupt bit is set.

Can the LDO regulators operate independently?

Yes, the device contains two independent LDO regulators. Each regulator supplies a separate SIM slot (VSIM1 and VSIM2) and can be individually controlled and configured for either 1.8 V or 2.95 V output.