Interface LSIs for data terminals and facsimile

Describes three high-performance interface LSIs, namely, the facsimile modem, universal receiver transmitter, and code converter LSIs, for facsimile, for communication control equipment, and for a digital service unit to connect the terminal equipment and the network. It is explained that optimization in block partitioning and common use of building block cells has been chosen as the LSI design method. These LSIs operate at from 1.4 (facsimile modem) to 6.1 MHz (universal transmitter receiver) clock frequencies with an adequate operating frequency margin. The power dissipation is 450-500 mW at 5 V the power supply voltage. The chip size for these LSIs is from 39 to 44 mm/SUP 2/. The LSIs consist of about 20000 transistors each. The output level is TTL compatible.