The is a member of the Series CMOS range, and contains four independent NAND gates, each with two inputs. The pinout diagram, given on the. NAND Gate, CD, 2 Input, mA, 3 V to 18 V, DIP with direct implementation of the NAND function and supplement the existing family of CMOS gates. Texas Instruments CDBE CD – CMOS Quad 2-Input NAND Gate (Pack of 5): : Industrial & Scientific.
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Discussion in ‘ General Electronics Chat ‘ started by smartyramAug 5, Aug 5, 1.
Aug 5, 17 2. I have created the following image attached NAND gate oscillator using 2 gates. The circuit supply voltage is 12v.
What is wrong in this circuit?
10pcs/lot CD4011BE DIP-14 CD4011 CMOS NAND GATES IC
Aug 5, 2. Apr 20, 15, You might get better results with a different arrangement of the RC components – http: Aug 5, 3. Dec 20, 10, 1, Your oscillator has both inputs of the gates shorted together.
If only one input is used and the spare input is connected to the positive supply voltage then the output will be more symmetrical. I don’t know why your oscillator has a switch at its dd4011 that shorts the output to ground.
NAND Gate Oscillator using CD | All About Circuits
Your SIM program doesn’t know that the input of Cmos gates have input protection diodes that limit the input voltage to plus and minus 0. Aug 6, 4. Hi Audioguru, I changed the circuit as per your suggestion. I got rid of the switch that shorts the output to ground, was using it as a reset. I still notice the output in the simulator is same. I read about input protection http: Aug 6, 5.
Hi beenthere, I have made a new circuit. Would appreciate any feedback from you? The wave is not exactly square in shape. Is it good enough to run a binary counter?
Aug 6, 6. Your simulation software is wrong because it shows the input going 4V higher than the positive supply and 4V below nanr. The diodes at the input protection of Cmos gates clamps the input voltage to 0. Your simulation sofware is also wrong when it shows the very slow switching ramps 0.
The datasheets of Cmos gates shows that they switch their output in only 50ns 0. Why do you use a very high value resistor 1M feeding the oscillator cnos the counter’s clock input? The resistor is not needed if the ICs use the same power supply voltage. Aug 6, 7.
4011 Quad 2-in NAND Gate CMOS IC
Feb 17, 4, 1, Ccd4011 it will be simpler to use You get oscillator and counter in one. Aug 6, 8. Aug 6, 9.
Aug 6, Your Yenka sim software doesn’t know if it is coming or going. A CD will not blow up unless you connect the power supply backwards. The 1M resistor between the oscillator and counter is not required and might stop the circuit from working because it will combine with fmos capacitance between wires and cause the square-wave from the oscillator to be a triangle-wave at the clock input of the counter.
Aug 7, May 11, The absolute max supply for a high speed 74HC is 7V and they recommed a max of 6V.
CD Datasheet(PDF) – TI store
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