Which ones would you use for protecting a low voltage signal input (digital)? Schottky or regular? I plan on using it in this configuration:
Or is there a better way?
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Super-barrier diodes offer the same speed/low-forward voltage drop as schottkys, but have better leakage characteristics. The ones I have seen have been more expensive than schottky diodes, but if power is at a premium in your design (battery powered?) it may well be worth the additional expense.
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All CMOS use this configuration using Schottky diodes to protect every input. But they are small diodes and limited to 15mA continuous current.
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2Really? I would have thought that the high leakage current of Schottky diodes would wreck one of the advantages of CMOS. – Warren Young May 02 '14 at 01:34
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It would, if Schottky diodes were used. But, at least for CMOS, they're not. – WhatRoughBeast May 02 '14 at 02:25
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I was actually talking about external circuitry... Not the internal clamping diodes in microcontrollers and such. – Pugz May 03 '14 at 13:23