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 μA

• 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