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From: mikelh@zonta.ping.de (Michael Hasselberg)
Subject: Re: 7407 question...
References: <CxqE0K.4tC@nyongwa.montreal.qc.ca>
Organization: A little private site running linux on a 386...
Date: Tue, 18 Oct 1994 20:33:10 GMT
Message-ID: <1994Oct18.203310.21771@zonta.ping.de>
Lines: 75

matrix@nyongwa.montreal.qc.ca (Albert Yale) writes:

> 
>7407
>Hex open-collector high-voltage buffers.
>Maximum output voltage is 30V.
> 
>    Ŀ             Ŀ
> 1A 1   14 VCC          A  Y            Y = A
> 1Y 2       13 6A          ͵
> 2A 3       12 6Y           0  0 
> 2Y 4  7407 11 5A           1  Z 
> 3A 5       10 5Y          
> 3Y 6        9 4A
>GND 7        8 4Y
>    
> 
>...that's all the information i have on the chip. Could someone email me
>(preferably) the inner workings of that chip (schematics maybe?) cuz i'd
>like
>to know for example what happens to 1Y when 1A is 1 (powered), is it
>grounded
>or powered by the vcc? what are its power spec? etc... that type of
>information i need. tnx...
> 
>'Matrix' -- i know, i know, i should get a book, any good suggestions?

Here they are:

The 7407 has open collector outputs, so a logic 1 means 'Output OFF'
the output may sink 40 ma, max. high-level (the external Voltage) is 30 V.


Internal of one Buffer ( taken from 'The TTL Data Book for Design Engineers',
	second Edition 1975, pp. 6-24, Texas Instruments)

                      __________________________________ Vcc
                      |          |          |
                      >          >          >
                      < 6k       <  3k4     < 1k6
                      >          >          >
                      |          |          |
                    ____        |/          |
                   v/  \        |           |
          A   ---+--    --------|\v         |        ______ Y
                 |                |         |      |/
                 |                >         +------|
                 |                < 100R    |      |\v
                 |                >         |       |
                 |                |        |/       |
                 ^                +--------|        |
                / \               |        |\v      |
                 |                >          |      |
                 |                < 1k       |      |
                 |                >          |      |
                 |________________|__________|______|_____ GND

>-- 
>100 little bugs in the code,   | I check my email more often than my
>100 little bugs,               | answering machine.
>fix a bug, compile again,      | So if you want to reach me, email at
>101 little bugs in the code... | matrix@nyongwa.montreal.qc.ca
101 little bugs in the code,
101 little bugs,            
fix a bug, compile again,  
102 little bugs in the code...

hope, this helps
Mike

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