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