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Kazuyuki NAKAMURA Masahide TAKADA Toshio TAKESHIMA Kouichirou FURUTA Tohru YAMAZAKI Kiyotaka IMAI Susumu OHI Yumi SEKINE Yukio MINATO Hisamitsu KIMOTO
A novel logic functional level converter (FLC) was developed to achieve a high speed ECL I/O BiCMOS SRAM. The FLC simultaneously enables high speed logic operation and ECL to CMOS level conversion. This paper describes an optimized design method for the FLC and an improved FLC. In addition, a high speed partial decoding level converter (PDLC), composed of improved FLCs, is presented. The FLC and a newly developed address decoding sheme with PDLCs, are keys to the successful production of the 5ns 1Mb ECL I/O BiCMOS SRAM.
Kazuyuki NAKAMURA Shigeru KUHARA Thoru KIMURA Masahide TAKADA Hisamitsu SUZUKI Hiroshi YOSHIDA Tohru YAMAZAKI
PLL timing design techniques introduced here feature (1) a word-line resetting-equalization scheme for reducting the access time and the memory cell current, (2) a cyclic input buffer power-cutting scheme to reduce the excess power in low-frequency operation, and (3) a super-pipelined parallel test scheme which allows the evaluation of high-speed LSIs by low-speed LSI testers to reduce the test costs. These techniques successfully contribute to the development of a 7 ns GTL I/O 16 Mb BiCMOS SRAM LSI.