描述 Description

The NXT4557 device is built for interfacing a SIM card with a single low-voltage host side interface. The NXT4557 has three level translators to convert the data, RST and CLK signals between a SIM card and a host microcontroller. A high speed level translation capable of supporting class?-?B, class?-?C SIM cards. An active HIGH EN pin enables normal operation of the translator. A HIGH to LOW transition on pin EN initiates a shutdown sequence on SIM card pins in accordance with ISO-7816-3.
The NXT4557 is compliant with all ETSI, IMT-2000 and ISO-7816 SIM/Smart card interface requirements.

特性 Features

? Support SIM cards and eSIM with supply voltages 1.62 V to 3.3 V
? Host micro-controller operating voltage range: 1.08 V to 1.98 V
? Automatic level translation of I/O, RST and CLK between SIM card and host side interface with capacitance isolation
? Incorporates shutdown feature for the SIM card signals according to ISO-7816-3
? High Vdis(UVLO_AC) switching level, arranging quick shut down when VCC_SIM powers down
? Integrated pull-up resistors; no external resistor required
? Integrated EMI Filters suppresses higher harmonics of digital I/O's
? A HIGH EN signal enables the translation of the signals
? Low current shutdown mode < 1 μA
? Supports clock speed beyond 5 MHz clock
? Pb-free, Restriction of Hazardous Substances (RoHS) compliant and free of halogen and antimony (Dark Green compliant)
? ESD protection:
? HBM ANSI/ESDA/JEDEC JS-001 exceeds 2 kV
? CDM ANSI/ESDA/JEDEC JS-002 exceeds 1 kV
? IEC61000-4-2 level 4, contact and air discharge on all SIM card-side pins are 8kV and 15 kV

? Available in 10-pin XQFN package

應用 Application

? NXT4557 can be used with a range of SIM card attached devices including:
? Mobile and personal phones
? Wireless modems
? SIM card terminals