Clamp Diodes on analog pins of the CD54HC4051

David J Schmidt

Other Parts Discussed in Thread: CD54HC4051

I have a question regarding the TI CD54HC4051 device, and the datasheet is attached. Are there clamping diodes on the analog I/O signals? If so, what is the maximum current thru those diodes? There doesn’t appear to be any clamping diodes according the datasheet, but I want to be absolutely sure of it.

over 11 years ago

0 Chris Cockrill over 11 years ago

TI__Mastermind 46480 points

there are diodes and they are rated at 20ma. If you look at the absolute max limits you will see Iik and Iok. Both specd with +/- current.s. This means there is a clamp diode to Vcc and to Gnd on the inputs and the outputs.

0 Jim K over 11 years ago in reply to Chris Cockrill

Prodigy 140 points

What is the voltage drop of the clamping diodes?

0 Chris Cockrill over 11 years ago in reply to Jim K

TI__Mastermind 46480 points

approximately .7V

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Clamp Diodes on analog pins of the CD54HC4051