CD4018B DATASHEET PDF
DESCRIPTION. The HCFB is a monolithic integrated circuit fabricated in Metal Oxide Semiconductor technology available in DIP and SOP packages. Data sheet acquired from Harris Semiconductor. SCHSC − Revised October The CDB types are supplied in lead hermetic dual-in-line. CDB datasheet, CDB pdf, CDB data sheet, datasheet, data sheet, pdf, Texas Instruments, CMOS Presettable Divide-By-N Counter.
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Use invertor between carry out cf4018b load to load the start value into the counter when it rolls over. The carry out is always 1 clock pulse wide.
First problem was that the data sheet says to tie the outputs together with a NAND gate Regarding the transistor though, whether it should be able to or not, the is capable of driving both an output led and triggering a littlebits microsquencer straight from the data pin, as long as it’s doing an even division. You can buy binary encoded switches A selector switch would’ve been a lot better than a dip switch, but it was readily available.
Sorry for the schematic, I drew it up in MSPaint and it has been a while since I’ve drawn a schematic. The datasheet uses Nand followed by invertor to get the AND functionality.
You could add isolating diodes so that you do not have that worry. The data pin on the will work fine from the common of the dip switch. Would appreciate any feedback before I commit it to perf board and build a second one. If you want to be more flexible, a simple atmega P chip can be used and programmed to provide any pattern you want to output. A 74LS08 has more output drive with a slightly different pin out. The hard part comes in that if you want to divide by odd numbers, you need to throw in some external logic.
Second problem was that, probably because of the low voltage of the littlebits power supply, the AND gate output wasn’t pushing enough current to drive the data in on the I would be particularly interested in knowing what the proper value of the resistor between the emitter and ground should be.
(PDF) CDB Datasheet PDF Download – CMOS PRESETTABLE DIVIDE-BY-N COUNTER
The is a twisted ring counter, there are several ttl programmable counters. This was fixed by the addition of a -very- mickey mouse transistor amp stage. You can use the DIP switch and diodes to provide the same sort of count selector, or just stick with binary input. I made it mostly for driving microsequencers at “triplet” rates. Datashret pulse goes in and, depending on how it’s set, for every x pulses in you get 1 pulse out.
If anyone cares to give it a good proof reading, again, it would be appreciated. If I end up making more of these, do you know if there’s a equivalent for the ? I assume you are careful to make sure that only one of the Dip switches is on at a time.
I spent the last two evenings putting this together on a breadboard. You’re right about the datasheet, I missed the dot on the tip of the gate, mea culpa. I could not, however, run the output of a to the data pin with any success unless I first amplified it.
Everything is also made a bit more difficult by the output being part of the feedback that determines the division rate.
Thanks for the response. Basically it’s a straight datasheet functionality of a cd divide by n cd40118b. Your arduino midi interface is actually next on the build list. I would use a 74LS which is a synchronous counter that can be programmed.