NetNews Usenet Archive 1992 #16/NN_1992_16.iso/spool/comp/sys/intel/1326

Internet Message Format | 1992-07-21 | 1.7 KB

Path: sparky!uunet!iWarp.intel.com|inews!mkahn
From: [e-mail] (Mitch Kahn)
Newsgroups: comp.sys.intel
Subject: Re: Are 50 MHz 486 DX's actually DX2's?
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Date: 21 Jul 92 18:06:44 GMT
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In-reply-to: [e-mail]'s message of 17 Jul 92 18:28:42 GMT

[e-mail] (Brian Rosen) writes:

 Nntp-Posting-Host: brian.cognos.visus.com
]
]
]  In CMOS processes, switching edges uses power.  The
]  internal gates use much less power that the external
]  pins.  The very biggest use of power in a chip like a 486
]  is to switch the external pins fast.  A real 486DX-50
]  switches its pins using the 50Mhz clock.  The -DX2
]  switches its pins with a 25Mhz clock.  There is a substantial
]  difference in power usage.
]

] | Brian Rosen                   |  Cognos*centi Corp.                     |

From the 486DX50 datasheet: Ic(max) = 1000ma; Icc(typ) = 800ma
From the 486DX250 datasheet: Icc(max) = 1600ma!! (no typical spec'd)

Bear in mind that the DX2 numbers are preliminary. I have better info
direct from the engineer who says the Icc numbers only differ by 50mA
(in the DX2's favor). The data sheets do not specify bus load which would
have a significant impact on Icc. Due to the small difference between
parts, I would think that they are tested unloaded.
--
|  Mitch Kahn              | "I hope you know that this will go down on |
|  [e-mail]  |  your permanent record..."                 |
*************************MY OWN OPINIONS*********************************