Translate Voltages for a SIM Card

Subscriber Identity Modules, commonly called SIM cards, are used to store secure information in mobile devices for use in communications. This type of voltage translation applies to SIM, USIM, and UICC.

Figure 1-1 Example SIM Card Voltage Translation Block Diagram

Design Considerations

Clock signals can be up to 5 MHz
Translators enable communication when devices have mismatched logic voltage levels
Prevent damage to devices that cannot support higher voltage inputs
Improve data rates over discrete translation solutions
Protect controller while peripheral is not connected
[FAQ] How does a slow or floating input affect a CMOS device?
Need additional assistance? Ask our engineers a question on the TI E2E™ Logic Support Forum

Table 1-1 Recommended Parts

Part Number	Automotive Qualified	Supported Card Types			Features
Part Number	Automotive Qualified	Class A 5 V	Class B 3 V	Class C 1.8 V	Features
TXS0104E		✓	✓	✓	Auto-bidirectional voltage translation for all channels Supports all voltages and frequencies for SIM/UICC Increased ESD protection on B ports
TXS0104E-Q1	✓	✓	✓	✓
TXS4555			✓	✓	Complete SIM/UICC translator solution Integrated LDO regulator Increased ESD protection on card-side
TXS02326A			✓	✓	Complete dual SIM/UICC translator and multiplexer solution Dual integrated LDO regulators I²C communication with baseband processor Increased ESD protection on card-side

For more devices, browse through the online parametric tool where you can sort by desired voltage, channel numbers, and other features.

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