The CX06827-xx packages have an integrated microcontroller unit (MCU), line interface codec, modem data pump, and bootloader ROM. SC56D = CX06827-11 (d/f/TAM) SC56D/S = CX06827-11 + 20437-11 (d/f/TAM/v/FDSP) 20437-11 Voice Codec 32-pin TQFP CX06827-11 ACF Modem (56kbps) 144-pin TQFP CX06827-13 ACF Modem (33.6kbps) 144-pin TQFP CX06827-14 ACF Modem (14.4kbps) 144-pin TQFP