A 400 ps bipolar 18 bit RALU using advanced PSA

Describes a bipolar 18 bit register arithmetic logic unit (RALU) with 1300-gate complexity using an advanced bipolar process named Advanced PSA (APSA). The high-performance of the Advanced PSA transistor has made it possible to achieve a 400 ps delay time with 2.5 mW for a basic low level CML (LCML) circuit. The read-modify-write cycle time is 7 ns in an 18-bit ALU operation. Furthermore, with four RALU chips, a 72-bit ALU can be set up to operate at 100 MHz owing to the improved logic implementation. A 132 pin gang-lead bonding is employed for this LSI.