The TXS4558 is a complete dual-supply standby Smart Identity Module (SIM) card solution for interfacing wire-less baseband processors with two individual SIM subscriber cards to store data for mobile handset applications. It is a custom device which is used to extend a single SIM/UICC interface to be able to support two SIM’s/UICC’s.
The device complies with ISO/IEC Smart-Card Interface requirements as well as GSM and 3G mobile standards. It includes a high-speed level translator capable of supporting Class-B (2.95 V) and Class-C (1.8 V) interfaces, two low-dropout (LDO) voltage regulators that have output voltages that are selectable between 2.95-V Class-B and 1.8-V Class-C interfaces. Simple GPIO inputs are used to switch between the two SIM cards and to put it into different modes. The voltage-level translator has two supply voltage pins. VCC sets the reference for the baseband interface and can be operated from 1.65 V to 3.3 V. VSIM1 and VSIM2 are programmed to either 1.8 V or 2.95 V, each supplied by an independent internal LDO regulator. The integrated LDO accepts input battery voltages from 2.3 V to 5.5 V and outputs up to 50 mA to the B-side circuitry and external Class-B or Class-C SIM card.
The TXS4558 also incorporates shutdown sequence for the SIM card pins based on the ISO 7816-3 specification for SIM cards. The device also has 8kV HBM protection for the SIM card pins and standard 2kV HBM protection for all the other pins.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | Dual-SIM Card Power Supply with Level Translator & Dedicated Dual LDO datasheet (Rev. A) | 27 Sep 2011 | |
| Application note | Schematic Checklist - A Guide to Designing with Auto-Bidirectional Translators | PDF | HTML | 12 Jul 2024 | |
| Application note | Understanding Transient Drive Strength vs. DC Drive Strength in Level-Shifters (Rev. A) | PDF | HTML | 03 Jul 2024 | |
| Selection guide | Voltage Translation Buying Guide (Rev. A) | 15 Apr 2021 | ||
| User guide | TXS4558EVM | 22 Sep 2011 |
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The Texas Instruments TXS4558 Evaluation Module (EVM) is designed to showcase the TXS4558, a complete dual-supply standby Smart Identity Module (SIM) card solution for interfacing wireless baseband processors with two individual SIM subscriber cards to store data for mobile handset applications. (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| WQFN (RUK) | 20 | Ultra Librarian |
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