Nexperia Introduces New Level Shifter NXT4557GU
Nexperia Introduces New Level Shifter NXT4557GU
Low operating and shutdown currents help maximize phone battery life
Nexperia, a specialist in basic semiconductor devices, today announced the launch of new additions to its family of level translators: the NXT4557GU and NXT4556UP. The new device enables seamless connectivity between next-generation low-voltage mobile phone baseband processors and Subscriber Identity Module (SIM) cards. As processor geometries move toward the single-digit nanometer node, the core voltage of advanced SOCs is also decreasing. This trend has led to an increasing need for voltage converters to connect SOCs to other standard processing devices and I/O ports (such as traditional Class B and Class C SIM cards).
Nexperia launches new level shifter to support legacy and future mobile SIM cards
The NXT4557GU and NXT4556UP are dual power converters that support voltage levels from 1.08 V to 1.98 V on the host processor side and 1.62 V to 3.6 V on the SIM card side. The above operating ranges allow these two devices to adapt to the traditional Class B (3.0 V ± 10%) and Class C (1.8 V ± 10%) voltage levels, while maintaining the voltage levels of future SIM card interface standards ( 1.2 V±10%) compatible. Both NXT4557GU and NXT4556UP have bidirectional IO, unidirectional reset and clock channel functions, and their intelligent ONE SHOT circuit can achieve ultra-low channel propagation delay. The low operating current (8µA) and standby current (only 1µA) of both devices help maximize cell phone battery life. Integrated pull-up resistors are beneficial to further reduce power consumption in standby mode, while also reducing overall system BOM cost and saving space. The NXT4557GU features an enable (EN) pin and is available in a leadless XQFN10 package, while the NXT4556UP is auto-enable and available in an ultra-small 0.35mm pitch WLCSP9 package.
"In the event of a system crash or accidental battery removal, the power on the SIM card rapidly discharges to ground, preventing the interface device from performing a shutdown sequence," said Nexperia Senior Product Manager. Helps avoid any inappropriate writes and data corruption."
