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From: mahar@jetsun.weitek.COM (Mike Mahar)
Newsgroups: comp.arch
Subject: Re: why is 33 MHz a popular number?
Message-ID: <1990Nov30.011019.3775@jetsun.weitek.COM>
Date: 30 Nov 90 01:10:19 GMT
References: <TOM.90Nov27065615@hcx2.ssd.csd.harris.com>
Reply-To: mahar@jetsun.WEITEK.COM (Mike Mahar)
Organization: WEITEK, Sunnyvale CA
Lines: 19

In article <TOM.90Nov27065615@hcx2.ssd.csd.harris.com> tom@ssd.csd.harris.com (Tom Horsley) writes:
>I see a lot of the current and near current top of the line RISC chips and
>other microprocessors coming out with a 33MHz clock rate. In a similar way
>the previously most popular number seemed to be 25MHz.
10Mhz = 100ns
20Mhz = 50ns
25Mhz = 40ns
33Mhz = 30ns
40Mhz = 25ns
50Mhz = 20ns
67Mhz = 15ns

Most Chip designers pick their next clock based on nano-seconds per cycle
rather than Mhz.


-- 
"The bug is in the package somewhere". |	Mike Mahar
 - Anyone who has used Ada	       | UUCP: {turtlevax, cae780}!weitek!mahar