These up down counters are monolithic complementary. MOS (CMOS) integrated circuits The CDBM and. CDBC are BCD counters while the. Details, datasheet, quote on part number: CD (CMOS) integrated circuits The CDBM and CDBC are BCD counters while the CDBM. The CDBC and CDBC up/down counters are monolithic complementary MOS (CMOS) integrated cir- cuits. The CDBC is a BCD counter.
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Discussion in ‘ General Electronics Chat ‘ started by sni9erNov 7, Nov 7, 1. Oct 21, 15 2. Nov 7, 2. Oct 2, 17, 5, You have to show your schematic. And yes, if you are using a switch or push-button to generate a clock you must debounce the switch.
Nov 7, 3. Nov 7, 4. Add Datasgeet pullups on Schmitt Trigger input.
Show the complete schematic of your Schmitt Trigger circuit. Nov 7, 5. Thanks MrChips i’ll add up a full diagram of my Schmidt Trigger today or tomorrow, the second image was my proposed idea which you have no confirmed wouldnt be a good idea i shall return! Nov 7, 6. Jul 17, 22, 1, Hang on a second Both of these have inverting outputs; but that was not shown on the diagram.
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The cap will help to prevent bounce. Rst must be held low, and PE must be held high. Nov 7, 7. That’s why I ask for OP to show a schematic. He said he is using 2 inverters. Nov 7, 8. Mar 14, 20, 5, Your schematic is incorrect. It shows the Daatsheet and CD both connected at the same time. It needs to be one datasheey the other.
Nov 7, 9. Nov 8, OK I have to apologies for the Rushed Diagram, I thought I had shown clearly, but after a nights sleep looking at dtaasheet again it actually looks like crap ha-ha anyway I have made some modifications to the schematic, with SGT’s suggestions and the DPDT switch in its current state which I believe without de-bouncing is causing the error. And I might add, don’t be so sure of yourself.
CD Datasheet(PDF) – Fairchild Semiconductor
It is both your switch and your Schmitt-trigger that are not properly wired. What’s wrong with your circuit? The input of the inverter has no DC path to ground.
It will be floating. The RC filter is configured incorrectly. The output of the inverter must be normally Daasheet for this counter read the data sheet. As it is, it can be anything with a floating input.
Your CD and CU inputs are floating. Below is my datashedt to fix all of the above: The inverter can be either plain inverter or Schmitt-trigger inverter. When you ask for help, it helps to be humble. Mar 24, 21, 2, The worst thing you can to do a CMOS input is to leave it floating. The above configuration simply never does that.
CMOS gates especially have very high input impedances. Hence they will act like radio antennas and will bounce around like crazy. When you switch your selector datasheeg, there is a moment when the inputs are not connected to anything, i.
The values of the resistors are high enough that they present a 50uA load to the inverter output which the inverter can easily sink. Just to clarify; the counter increments or decrements when the up or down input transitions from 0 to 1. I might also add that the above Datasheet push button debouncer is not always perfect.
The output of the latch will change state as soon as the PB is pressed and will not dataaheet back until the opposite contact is bridged. Normally one would see this feedback circuit using a pair of NAND gates. Inverters as shown will also work in this application. If you are using TTL gates, make sure you change the resistors to 1K ohms. Of course, the one drawback with this circuit is that it requires a double-throw push-button.
When the switch first hits one position or the other, the output of one of the inverters is shorted to ground. Arguably, the situation exists only momentarily. However, the momentary high current through the switch will tend to age it quite rapidly.
To alleviate this situation, 10k resistors should be added in series with the wires going from the outputs of one inverter to the input of the other inverter. Up Down Counter Circuit Posted by maruf10 in forum: You May Also Like: How to Use the Arduino Joystick Shield v2. There are different versions but we’ll be using v2.
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