onsemi FXLA2203UMX

Dual-Mode Dual-SIM Card Level Translator

RF and Baseband Circuit, QCC24

IC TRANSLATOR LEVEL DUAL 24UMLP

IC INTERFACE SPECIALIZED 24UMLP

The FXLA2203 allows either two hosts to simultaneously communicate with two Subscriber Identity Modules (SIM), or two User Identity Modules (UIM). Dual Mode refers to the mobile phones that are compatible with more than one form of data transmission or network (such as GSM, CDMA, WCDMA, TDSCDMA, or CDMA2000), resulting in a dual-baseband processor configuration. In a dual-mode application, the FXLA2203 host ports interface directly with the baseband processors. The bi-directional I/O open-drain channel features auto-direction and internal 10KΩ pull-up resistors. RST and CLK provide unidirectional translation from host to card only. Either host can swap SIM slots with the assertion of a single control pin: CH_Swap. The typical channel swap time is 130ns. The FXLA2203 does not contain internal Low Dropout Regulator (LDOs). Instead, the FXLA2203 architecture incorporates two low-RON internal power switches for routing existing PMIC (Power Management Integrated Circuit) LDOs to individual SIM slots. This reduces overall system power, leverages existing LDO system resources, and aligns with the philosophy that centralizing LDOs in the PMIC facilitates power management. Since the FXLA2203 does not block the LDO function to the SIM card, existing activation / deactivation timing transparency is maintained between Hosts, PMICs, and SIM cards. The device allows voltage translation from as high as 3.6V to as low as 1.65V. Each port tracks its own port power supply.