In SX Microcontrollers, SX/B Compiler and SX-Key Tool, ShadowsSoldier wrote:

Dan, its been a while since I cracked open the "TTL cookbook", but I see what you did with Q12. Very good. Have you tried your counter circuit you posted and does it work? Why did you choose the HC4040 instead of the HCT4040 (TTL)? I looked at the datasheet for the 4040 and it appears the frequency is a lot lower than the Toshiba component you posted.

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