NCN4555

NCN4555 1.8V / 3V SIM Card Power Supply and Level Shifter 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. The device fulfills the ISO7816−3 smart card interface standard as well as GSM 11.11 and related (11.12 and 11.18) and 3G mobile requirements (IMT−2000/3G UICC standard). With the STOP pin a low current shutdown mode can be activated making the battery life longer. The Card power supply voltage (SIM_VCC) is selected using a single pin (MOD_VCC). 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 1.6 V to 5.5 V 2.7 V to 5.5 V 0.1mF 0.1mF MPU or Microcontroller NCN4555 VBB P3 P2 P1 P0 SIM Card Detect GND GND 5 3 VDD 1 STOP 2 MOD_VCC 14 RST 13 CLK 15 I/O SIM_VCC 7 SIM_RST 9 SIM_CLK 11 SIM_I/O 8 1 2 3 4 VCC GND RST CLK I/O C4 C8 5 6 7 8 DET DET 1mF GND 10 GND Figure 1. T...