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. 

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: no external resistors required 

• 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. External ESD diodes are not required. 

• 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 

Applications 

• NVT4557 can be used with a range of SIM card attached devices including: 

– Mobile and personal phones 

– Wireless modems 

– SIM card terminals

NVT4557 Datasheet Download