CD4026B: Version w/ Output Latch?

Fred Doe

Part Number: CD4026B
Other Parts Discussed in Thread: SN74LS247, SN74LS590

Is there an IC (preferably 40xxB series) with function like the 4026B IC but also having a latch somewhere between the output pins and the counter? My basic application is a discrete logic frequency counter(ultimately a small panel meter). I could of course add a 8-bit wide output latch (or D flip flops) between the 4026B output and the display, however this would be somewhat cumbersome. Another possibility would be 4518B + 4511B combination, but again the smaller the better. Any other suggestion for a low BOM count would be appreciated. P.S. I tried a microcontroller but it seemed to noisy--albeit I also am no expert on programming.

Thanks for any help!

over 5 years ago

0 Chad Crosby over 5 years ago

TI__Expert 6680 points

Hi Fred,

Let me see if I can better understand what you're trying to accomplish. Are you looking to freeze your 7 segment display while your counter keeps track of incoming signals; and, only update the 7-seg on another input signal?

Thanks!

Chad Crosby

0 Fred Doe over 5 years ago in reply to Chad Crosby

Intellectual 655 points

Yes; basically the 4026 has a frequency I am trying to measure on the CLK pin, I have it count at that frequency for a period of 0.1s (i.e. applying a 0.1s pulse to the CLK enable pin),then after the 0.1s pulse has finished, update the display with the count on the 4026 output by enabling the latch with a brief pulse, after the latch pulse is finished, give a brief pulse to reset the 4026 count, an then begin the 0.1s pulse again.

Thanks!

0 Chad Crosby over 5 years ago in reply to Fred Doe

TI__Expert 6680 points

Hi Fred,

So we don't have something that can do what you're looking for in just 1 package; however, you can use one of our BCD to 7 Segment display decoders + one of our counters that has an output register built in.

A good combination example would be the SN74LS590 (Counter with output registers) + the SN74LS247 (BCD to 7 Segment).

Let me know if you have any questions.

Thanks!

Chad Crosby

0 Fred Doe over 5 years ago in reply to Chad Crosby

Intellectual 655 points

Thank you for your help!

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CD4026B: Version w/ Output Latch?