TP3155 Time Slot Assignment Circuit General Description The TP3155 is a monolithic CMOS logic circuit designed to generate transmit and receive frame synchronization pulses for up to 8 COMBOTM CODEC/Filters. Each frame sync pulse may be independently assigned to a time slot in a frame of up to 32 time slots. Assignments are controlled by loading in an 8-bit word via a simple serial interface port. This control interface is compatible with that used on the TP3020/TP3021 and 2910/2911 CODECs, enabling an easy upgrade to COMBO CODEC/Filters to be made. Features Y Controls up to 8 COMBO CODEC/Filters Y Independent transmit and receive time slot assignments Y 8-channel unidirectional mode Y Up to 32 time slots per frame Y Serial control interface compatible with TP3020/TP3021 CODECs Y LS TTL and CMOS compatible inputs Y 5 mW, 5V operation