Subject: Re: [IBIS-Users] Question On Input buffers
From: Ingraham, Andrew (a.ingraham@ieee.org)
Date: Thu May 15 2003 - 09:11:41 PDT
That sounds like the current from a 1 MegOhm resistor to ground.
The IBIS "Clamp" tables include everything that is present on inputs, or
outputs when not actively driving. That includes leakage current, on-chip
terminators, other resistors or always-enabled FETs, etc. Not just diodes.
The fact that the current is only -1.50 uA at -1.5 V implies that there is
no actual diode in your model.
Regards,
Andy
> Could someone clarify why my input buffer gnd clamp IV table
> starts from -1.50ua at -1.5V goes to 0 at 0V and goes back to 1.5ua at
> 1.5V. Is this correct. I believe it should start from a specific value
> and go down to 0V. Just want to know what might be wrong : is it my
> spice netlist( working fine with spice sims) or my .s2i file.
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