Path: utzoo!attcan!uunet!dalcs!dalcsug!euloth
From: euloth@dalcsug.UUCP (George Seto)
Newsgroups: comp.sys.atari.8bit
Subject: Re: more info on my interfacing problem..
Summary: High Speed 74374
Message-ID: <104@dalcsug.UUCP>
Date: 17 Sep 88 02:47:09 GMT
References: <8809152000.AA28912@ucbvax.Berkeley.EDU>
Organization: Math, Stats & CS, Dalhousie University, Halifax, NS, Canada
Lines: 27

In article <8809152000.AA28912@ucbvax.Berkeley.EDU>, BIW109@URIMVS.BITNET writes:
>The data latch in question is a 74374 (i think..  I haven't been
> home from school to look at it in the past few weeks), and acts on the
> rising edge of the pulse.  The timing problem that I was intested in
> is how long is data valid for once it is placed onto the bus?	 Since
> the latch acts on the rising edge of the strobe, i assumed that the
> interface circuit must be taking too long.  Since the 74154 is the most
> complicated chip in the interface (if I remember correctly, it has at
> least 4 or 5 levels of gates in it) I was thinking of using a high
> speed version of the chip, assuming I can find one.

I don't know for sure, but..... You can get "high" speed versions of the 
74374 but I am not sure about the '154 in High Speed versions. I would 
suggest usage of the HC series of devices, or if you can't find them,
LS series. 74LS and 74HC are both faster than standard TTL. LS stands for
Low-power Schottky and HC stands for High-speed CMOS devices. There is also
a version of the HC called HCT which will work best with TTL devices.
As you can see, the both of them should also be lower power than the
original TTL devices you have mentioned. I will check on the availability
of HC and LS versions of the 74154 and advise tomorrow.

> 
-- 
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