The NCN4555 is a level shifter analog circuit designed to translate the voltages between a SIM Card and an external microcontroller or MPU. A built−in LDO−type DC−DC converter makes the NCN4555 useable to drive 1.8 V and 3.0 V SIM card.

FEATUREs
• Supports 1.8 V or 3.0 V Operating SIM Card
• The LDO is able to Supply More than 50 mA under 1.8 V and 3.0 V
• Built−in Pullup Resistor for I/O Pin in Both Directions
• All Pins are Fully ESD Protected According to ISO−7816
   Specifications – ESD Protection on SIM Pins in Excess of 7 kV
   (Human Body Model)
• Supports up to More than 5 MHz Clock
• Low−Profile 3x3 QFN−16 Package
• These are Pb−Free Devices*

Typical Applications
• SIM Card Interface Circuit for 2G, 2.5G and 3G Mobile Phones
• Identification Module
• Smart Card Readers
• Wireless PC Cards