RE: [SI-LIST] : Schottky diode termination

Peterson, James F (
Wed, 28 Oct 1998 08:48:23 -0500

After quickly leafing through a couple data books, I think you're right.

From: []
Sent: Wednesday, October 28, 1998 8:23 AM
Subject: Re: [SI-LIST] : Schottky diode termination

> Clamp diodes inside TTL devices are useless for termination on the
high side
> because they are so far above a TTL high signal (diode doesn't
turn on until
> ~5.6V, while the signal is ringing around 3V).

I thought the 74LS series didn't have any clam diodes to Vcc, only
to ground.


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