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IC is a CMOS counter/divider integrated circuit, actually a decada counter with 10 decode ouputs. It is 5 stage Johnson counters having 10 decoded. DESCRIPTION. The HCFB is a monolithic integrated circuit fabricated in Metal Oxide Semiconductor technology available in DIP and SOP packages. Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise .

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Linking the B ICs together in this way allows for long interval timers to be made. As long as the clock inhibit is held low, upon a rising edge of the clock pin the output will count up from zero, one number at a time for each rising edge on the clock pin. Thank you for your interest in this question. UK Deliveries If you live on the UK mainland and don’t have any large materials or lithium batteries in your order it will cost 3. Supplying no voltage requires either a high-impedance output or leaving an input pin floating.

CMOS – CMOS – Decade counter with 10 decoded outputs

Email to a Friend. I’m attempting to make a circuit that flashes each LED sequentially. You must have JavaScript enabled in datashee browser to utilize the functionality of this website. You can figure out the resistor value to use by rearranging Ohm’s law: Drawing shows a pushbutton between Vcc and the actual power supply that is not on the schematic.

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The counter is reset to zero when the reset line is held in a high state.


International orders may be charged import duty dependant on local import laws and duty rates. Be the first to review this product Email to a Friend. For the given circuit current flows through LED if output is high the source current is relevant.

Would you like to answer one of these unanswered questions instead? The LEDs won’t be as bright, but it might be within your ‘s current sinking ability and at least allow you to determine if things are working correctly. Home Questions Tags Users Unanswered. For the split second that it stops supplying voltage all the LEDs dimly flash on. Continuous pulsing by the IC results the LEDs of the B turning on and off in sequence, creating a ripple effect.

If it’s normally open, then that’s your problem. The B is an integrated circuit which has been designed to count pulses. Further Information For information about all of the delivery options we offer click here.


Be the first to review this product. Add a timer to pulse the decade counter. Thanks for the heads up! A astable circuit is used to pulse the B at regular intervals.

Note that the circuit you linked has a “1K2” resistor connecting the LEDs to ground negative. Write Your Datashert Review You’re reviewing: Max clock frequency at 5V: This ensures that they cannot be accidentally pulled off the circuit easily. For a list of postcodes that will be charged the remote location rate click here. That’s equivalent to 1.

Delivery times datasheef for international orders depending on the service selected and the destination. These charges are usually billed to you directly from UPS. I’ll give it a go and see what happens.


Decade counter (4017B)

If you spend between 40 and 48 – For the split second that the timer supplies voltage to thea random LED is lit datashret. The pulse from the IC is generated from pin 3.

There are no product questions yet. Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site the association bonus does not count. I added the source current graph to the answer.

The decade counter has ten output lines, one to represent each of the numbers 0 to 9, there is also a carry out line which goes high as the counter goes from 9 back round to 0. You’ve verified that LED 0 is connected to pin 3, 1 to 2, 2 to 4, etc. A good example is seen below. It couldn’t be that though since sometimes the same LED will flash two or three times in a row ocassionally.

Curd You are correct, I had not paid attention to the schematic properly. Also note that the timer never actually “stops” supplying voltage; it supplies a high voltage, and then it supplies a low voltage, repeatedly. Collection If you would like to collect your order, or use your own courier then there is an option you can select during checkout.