Xref: utzoo sci.electronics:1922 comp.sys.ibm.pc:10740
Path: utzoo!mnetor!uunet!husc6!uwvax!astroatc!johne
From: johne@astroatc.UUCP (Jonathan Eckrich)
Newsgroups: sci.electronics,comp.sys.ibm.pc
Subject: Re: TTL Families
Message-ID: <713@astroatc.UUCP>
Date: 15 Jan 88 22:14:23 GMT
References: <1552@mipos3.intel.com> <634@netxcom.UUCP>
Organization: Astronautics Technology Cntr, Madison, WI
Lines: 56


Just some brief additions.

In article <634@netxcom.UUCP> jallen@netxcom.UUCP (John Allen) responds:

>
>7400		Original TTL

Slow and lots of power.

>74F00		I dunno

F stands for Fast.  Made by Fairchild, Signetics, and Motorola.  My favorite
choice for speed, power, price, ease of use.

>74ALS00	Advanced Low-Power Schottky, improved noise immunity over LS

Comparable to F-parts, made by TI, so don't trust availablity.

>74AS00		Advanced Schottky

Comparable to ALS, but faster, and needs more power.

>74C00		CMOS

Very low power, slower, sensitive to static discharge, wide range of supply
voltage.

>74HC00		High-Speed CMOS, 'LS' Comparable speed
>74HCT00	High-Speed CMOS, TTL Voltage Compatible
>74H00		High-Speed TTL


>74L00		Low-Power TTL

Slower than original, almost as old.

>74S00		Schottky

Predecessor to LS, AS, ALS. 

>74LS00		Low-Power Schottky
>
>Anyone have a rule of thumb for compatible types, incompatible types?
>

Sure.  Plug them together, and if you don't smell smoke, they work. ;-)
Actually, I don't have a rule a thumb to use.  I look in the spec sheets to
see if the chip doing the driving has (near) equivalent voltage and current
capabilities to that of the receiving chip.

-- 
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Jonathan Eckrich                 |   (rutgers, ames)!uwvax!astroatc!johne 
Astronautics Technology Center   |   ihnp4!nicmad!astroatc!johne
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