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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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The RC filter is configured incorrectly. Mar 24, 21, 2, Nov 7, 1.

Hang on a second The above configuration simply never does that. Your name or email 400192 What’s wrong with datasheef circuit? Nov 7, 4. How to Use the Arduino Joystick Shield v2. Yes, my password is: I might also add that the above Schmitt-trigger push button debouncer is not always perfect.

The input of the inverter has no DC path to ground. However, the momentary high current through the switch will tend to age it quite rapidly. Normally one would see this feedback circuit using a pair of NAND gates.


Rst must be held low, and PE must be held high. The output of the inverter must be normally HIGH for this counter read the data sheet. Nov 7, 5. Nov 8, You May Also Like: The cap will help to prevent bounce. No, create an account now. And I might add, don’t be so sure of yourself. Do you already have an account?


National Semiconductor

When you switch your selector switch, there is a moment when the inputs are not connected to anything, i. It shows the CU and CD both connected at the same time.

Just to clarify; the counter increments or decrements when the up or down input transitions from 0 to 1. CMOS gates especially have very high input impedances. Your schematic is incorrect. Oct 21, 15 2. Jul 17, 22, 1, Inverters as shown will also work in this application.

The inverter can be either plain inverter or Schmitt-trigger inverter. It is both your switch and your Schmitt-trigger that are not properly wired. If you are using TTL gates, make sure you change the resistors to 1K ohms. Add K pullups on Schmitt Datasheer input. It needs to be one or the other. Both of these have inverting outputs; but that was not shown on the diagram.

Nov 7, 8. Up Down Counter Circuit Posted by maruf10 in datasneet When you ask for help, it helps to be humble.

To alleviate this situation, 10k datasheeet should be added in series with the wires going from the outputs of one inverter to the input of the other inverter.


Discussion in ‘ General Electronics Chat ‘ started by sni9erNov 7, Nov 7, 9. It will be floating. That’s why I ask for OP to show a schematic.

CD Datasheet(PDF) – National Semiconductor (TI)

Nov 7, 7. 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. Hence they will act like radio antennas and will bounce around like crazy. Your CD and CU inputs are floating. You have to show your schematic. Nov 7, 2. Below is dataeheet suggestion to fix all of the above: The values of the resistors are high enough that they present a 50uA load to the inverter output which the inverter can easily sink. OK I have to apologies for the Rushed Diagram, I thought I had shown clearly, but after a nights sleep looking at it 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.