Rambus (RMBS) - Eagle or Penguin Message Board

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Technology Stocks : Rambus (RMBS) - Eagle or Penguin

RMBS 87.20

-3.3%

Nov 20 3:59 PM EST

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To: Bilow who wrote (29084)	9/9/1999 7:08:00 PM
From: John Walliker	Read Replies (2) of 93625

Carl, From the above, it is quite obvious that given two memory systems of the same size, the rambus memory system is going to use about twice as much power. To make power consumption comparisons it is necessary to quote the supply voltage as well as the current. It is also necessary to know the duty cycle in each state. What you say is not obvious as the data is incomplete. The figures you quote do not tally with the Samsung data sheet I downloaded a few days ago [rdram128dAbook.pdf]. RDRAM blocks consuming power @ Tcycle=2.5ns Idd, PDN 3000uA max Idd, NAP 4mA max Idd, STBY 105mA max Idd, ATTN 165mA max Idd, ATTN-W 575/625mA max 16/18 bit Idd, ATTN-R 490/520mA max 16/18 bit STBY is the normal idle state of the RDRAM. Note also that there are low-power self refresh versions available too. Vdd = 2.5 V Vcmos = 2.5V or 1.8V The CMOS interface consumes power in all power states. b. This does not include the IOL sink current. The RDRAM dissipates IOLxVOL in each output driver when a logic one is driven. Vol cmos = 0.3V @ 1 mA max Not very much power. John

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