[SI-LIST] : Zo for HCT

About this list Date view Thread view Subject view Author view

From: jfr.gaab@velux.com
Date: Fri Oct 22 1999 - 05:37:11 PDT


Hi all,

Can one find Zo of the 74HCT245 from: HIGH (typ): (Vcc-Voh)/Ioh = (4.5-4.22)/6m
= 30 ohm,
LOW (typ): Vol/Iol = 0.16/6m = 26.67 ohm ?
Is it possible to use the Zo of the 74HCT245 as source terminator for a trace of
30 ohms ? Is it wise ?
Should one choose an other trace impedance ?
Tracks are on a daughter card and will be both point to piont and point to
multipoint (databus),
the CPU on the mainbord is running 33 MHz clock.

Is there a better way to terminate tracks (74HCT245 can't drive an end
termision) ?
- e.g. choose an other device family and use end termination.

Regards,

Johnni

**** To unsubscribe from si-list: send e-mail to majordomo@silab.eng.sun.com. In the BODY of message put: UNSUBSCRIBE si-list, for more help, put HELP. si-list archives are accessible at http://www.qsl.net/wb6tpu/si-list ****


About this list Date view Thread view Subject view Author view

This archive was generated by hypermail 2b29 : Tue Feb 29 2000 - 11:39:18 PST