1 General description
The NVT4557 device is built for interfacing a SIM card with a single low-voltage 1.08 V to 1.98 V host side interface. The NVT4557 contains three 1.62 V to 3.6 V level translators to convert the data, RSTn and CLKn signals between a SIM card and a host microcontroller. The NVT4557 is compliant with all ETSI, IMT-2000 and ISO-7816 SIM/Smart card interface requirements.

2 Features and benefits
• Supports clock speed up to 10 MHz clock
• Compliant with all ETSI, IMT-2000 and ISO-7816 SIM/Smart card
interface requirements
• Support SIM card supply voltages with range of 1.62 V to 3.6 V
• Host microcontroller operating voltage range: 1.08 V to 1.98 V
• Automatic level translation of I/O, RSTn and CLKn between SIM card and host side interface with capacitance
isolation
• Incorporates shutdown feature for the SIM card signals according to ISO-7816-3
• Automatic enable and disable through VCCB (Enable pin on NVT4557HK 10 pin package only)
• Integrated pull-up and pull-down resistors
• Integrated EMI filters suppress higher harmonics of digital I/Os
• Integrated 8 kV ESD protection according to IEC 61000-4-2, level 4 on VCCB or any of the card side pins
• Level shifting buffers keep ESD stress away from the host (zero-clamping concept)
• Pb-free, Restriction of Hazardous Substances (RoHS) compliant and free of halogen and antimony (Dark
Green compliant)
• Available in 9-pin WLCSP package in 0.3 mm pitch and 10-pin XQFN10 package with 0.4 mm pitch

3 Applications
• NVT4557 can be used with a range of SIM card attached devices including:
– Mobile and personal phones
– Wireless modems
– SIM card terminals