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From: John Devereux
Subject: Re: Help: Why 1.5V output in Samsung SRAM K6R1016C1C(KM6161002C) ?
Date: Fri, 27 Dec 2002 08:22:39 +0000
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NNTP-Posting-Date: 27 Dec 2002 08:22:11 GMT
"Zhong Pan" wrote:
>Thanks John. That would be my guess too (no power or chip blown up) if I
>hadn't seen correct data being written into and read out of the chip. Yes, I
>can write into the chip and read out of the chip correctly, according to the
>measurement done by an Agilent Infiniium DCA. But the voltage is low, and I
>suspect that it is the reason that causes some glitches in my next stage,
>which is a DAC. This still puzzles me.
Well, things can still partially work even with no power
supply. The power comes through the protection diodes on the
I/O pins. Similarly with the "blown up" theory; it could
still mostly work.
Can you measure the correct supply voltages (5V and ground)
at the chip pins?
>One thought: could it be that I am not measuring the right voltage at all?
>My measurement at the SMA connectors driven by a BERT shows a HI voltage of
>2.5V, and power source current does not change. But while measuring the SRAM
>chip, the power source current will increase for around dozens of mA. Is the
>oscilliscope seen by the SRAM chip as a big load?
If you've switched the scope to 50 ohms it will be a big
load! So don't do that :)
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