The CMOS circuit SDA 5649 is intended for use in video cassette recorders to retrieve control data of the PDC system from the data lines broadcast during the vertical blanking interval of a standard video signal.The SDA 5649 is devised to handle PDC data transported either in Broadcast Data Service Packet(BDSP) 8/30 format 2 (bytes no. 13 through 25) of CCIR teletext system B or in the dedicated dataline no. 16 in the case of VPS.

Furthermore it is able to receive the Unified Date and Time (UDT) information transmitted in bytes no. 15 through 21, the Network Identification code (NIC) carried in bytes no. 13 and 14, and theShort Program Label carried in bytes no. 22 through 25 of packet 8/30 format 1.For reception of clock time when no BDSP 8/30/1 is present the SDA 5649 can be enabled to extract bytes no. 38 through 45 of the teletext header row.All operating modes (PDC/VPS) are selected by a control register which can be written to via theI2C-Bus interface