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Old 09-22-2009, 02:32 AM
sparky3489 sparky3489 is offline
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Default TTL equivalent

Anybody know if a TTL equivalent exists for this CMOS device and if the ones I have found will work in the schematic?

Other suggestions welcome.

CD4063 = 74HCT85
CD4040 = 74HC4040
CD4001 = 74HC02
CD4069 = 74HC04
CD40110 = ?

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Old 09-22-2009, 08:56 AM
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bertus bertus is offline
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Hello,

It looks like the 40110 is a combination function chip.
40110 - Up/Down Counter-Latch-Decoder-Driver
Here are two tables with digital chips, one for TTL and one for 4000 series:
http://en.wikipedia.org/wiki/List_of...rated_circuits
http://en.wikipedia.org/wiki/List_of...rated_circuits

Greetings,
Bertus
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Old 09-22-2009, 12:51 PM
Audioguru Audioguru is offline
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74HCxxxx is not TTL. It is high speed Cmos that needs a 2V to 5V supply.
I think the 74HC04 will melt in the CD4069 oscillator circuit.
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Old 09-22-2009, 06:48 PM
jgessling jgessling is offline
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Default Part numbers

For the CD40110 you may have to use two ttl chips. One 74LS90 for the counter outputting BCD to a 74LS47 to drive the displays. I'm just figuring out a similar thing so take this with a grain of salt. You can see how little the 74LS90 does so I suppose it made sense to combine the two functions into one chip.

Regards, Jim
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Old 09-22-2009, 06:58 PM
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bertus bertus is offline
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Hello,

A 74190 will do up and down counting, as a 7490 can only count up.
You will also need a latch like a 7477.
Then you will need a decoder for the display.
The type depends on the type of display used.

Greetings,
Bertus
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Old 09-23-2009, 01:25 AM
sparky3489 sparky3489 is offline
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WOW! Awesome responses.

Quote:
It looks like the 40110 is a combination function chip.
40110 - Up/Down Counter-Latch-Decoder-Driver
I found that to be the case as well. Thanks for the links.

Quote:
74HCxxxx is not TTL. It is high speed Cmos that needs a 2V to 5V supply.
I think the 74HC04 will melt in the CD4069 oscillator circuit.
I was afraid of that.

Quote:
For the CD40110 you may have to use two ttl chips. One 74LS90 for the counter outputting BCD to a 74LS47 to drive the displays. I'm just figuring out a similar thing so take this with a grain of salt. You can see how little the 74LS90 does so I suppose it made sense to combine the two functions into one chip.
Quote:
A 74190 will do up and down counting, as a 7490 can only count up.
You will also need a latch like a 7477.
Then you will need a decoder for the display.
The type depends on the type of display used.

It looks as though I may stick with the original design or go single chip with an AVR.

Thanks everyone.

P.S. This is the concept - http://carstereoforum.net/showthread.php?t=1229

The 8-bit to 7-segment was just a "bells and whislte" kind of thing.
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