15V 7400 logic family??
Synthaholic AKA The Shark
chordman at flash.net
Fri Mar 28 18:09:09 CET 1997
Motorola part # MC14161B is functionally equivalent to the 74161.
Here is a quote from my data book:
The MC14160B - MC14163B are synchonous programmable counters
constructed with complementary MOS P-channel and N-channel enhancement
mode devices in a single monolithic structure. These devices are
functionally equivalent to the 74160 - 74163 TTL counters.
My data book is the "Motorola CMOS Logic Data"
Q4/91 DL131 Rev 3.
I don't know if the device is a pin for pin replacement, but it will
*do* the same thing as the 74161.
On Thu, 27 Mar 1997 16:07:08 -0800, you wrote:
>At 11:17 PM 3/27/97 GMT, you wrote:
>>On Thu, 27 Mar 1997 08:40:37 -0800, you wrote:
>>>I'm designing a nice and simple 2 channel sequencer and, of course, I'd
>>>like to make it small and easy to build. Naturally I'm drawn to using CMOS
>>>digital ICs because 1) they allow supply voltage of 15V and 2) they consume
>>>next-to-nothing power under static conditions. So I looked over the CMOS
>>>CD4000 family and found the functionality was kind of light compared to the
>>>classic TTL 7400 family.
>>Perhaps a little lighter with respect to more hardcore computer
>>related binary stuff, but there are other devices that are *perfect*
>>for analog signal handling, such as analog multiplexors and
>>transmission gates. Perhaps you could let us know what kind of
>>devices TTL offers that you'd like to emulate in CMOS. Very often, a
>>simple combination of basic elements will yield what is desired. And
>>as you say, power consumption is next to nothing, so a small increase
>>in package count will not seriously affect power supply design.
>Ok, the analog portion of the circuit is pretty simple. I'll use a couple
>of CD4051's that will select 1 of 8 voltages from 2 rows of 8 pots and the
>4051 outputs going to 2 opamps. The TTL-like device I have my eye on is
>and would be the core of this sequencer is a 74161 (4 bit cascadable full
>synchronous binary counter). I'm pretty sure that with the features I plan
>to design into this, I can use this chip with just several other "glue"
>chips as the engine that steps the sequencer. I'm really bent on a lean
>design. I don't want to have to fashion a fancy substitute using the
>CD4000 series just to make a synchronous counter.
>After giving it some thought, it will probably be easiest to simply use the
>5V 74HC00 family with an onboard lower power 5V regulator. My working pot
>voltage would then be 5V (so I won't blow the 4051's) and I'll amplify the
>selected pot voltage with the opamps to get it to the final ouput level
>that I need.
>John Speth (johns at oei.com)
>Object Engineering, Inc.
- Scott Gravenhorst (Synthaholic)
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