General description

The NVT4555 device is built for interfacing a SIM card with a single low-voltage host side

interface. The NVT4555 contains an LDO that can deliver two different voltages, 1.8 V or

2.95 V from typical mobile phone battery voltages up to 5.25 V and three level translators

to convert the data, RSTn and CLKn signals between a SIM card and a host

microcontroller.

The NVT4555 contains one voltage select pin (CTRL) to select either 1.8 V or 2.95 V for

SIM card power supply and one active HIGH enable pin (EN) to enable normal operation.

The NVT4555 is compliant with all ETSI, IMT-2000 and ISO-7816 SIM/Smart card

interface requirements.

Features and benefits

 Support SIM card supply voltages 1.8 V and 2.95 V

 Input voltage range to LDO: 2.5 V to 5.25 V

 Host microcontroller operating voltage range: 1.1 V to 3.6 V

 Automatic level translation of I/O, RSTn and CLKn between SIM card and host side

interface with capacitance isolation

 Low current shutdown (EN = 0) mode < 1 A

 Supports clock speed beyond 5 MHz clock

 Incorporates shutdown feature for the SIM card signals according to ISO-7816-3

 8 kV IEC61000-4-2 ESD protected on all SIM card contact pins

 Pb-free, Restriction of Hazardous Substances (RoHS) compliant and free of halogen

and antimony (Dark Green compliant)

 Available in 12-pin WLCSP package (1.19 mm  1.62 mm  0.56 mm (nominal),

0.4 mm pitch)

Applications

 NVT4555 can be used with a range of SIM card attached devices including:

 Mobile and personal phones

 Wireless modems

 SIM card terminals