trouble with logic counters

Hello, I'm trying to hook up a 74HCT163 to count from 0 to 7 then loop and keep doing it. I'm having a lot of trouble making sense of the data sheet on how to connect this thing. I have a 555 chip creating my clock, it's lighting an LED right now, I took that from the positive end of the LED and am running it into the counter. I was worried about going straight from the 555 chip to the counter cause i've heard these type of chips are fragile, real sensitive to too much current/voltage. I'm powering the circuit with a 9 Volt battery, I'm splitting that in half using a couple resistors (of equal value 10 Mohm) in series and taking the voltage from one resisttor and using it as my high for the counter. I've connected the pins in this way:

1 MR - high 2 CP - 555 output 3 P0 - high 4 P1 - high 5 P2 - high 6 P3 - high 7 PE - high 8 GND - ground 9 SPE - high 10 TE - high 11 Q3 - not used 12 Q2 - to a 1K resistor in series with an LED 13 Q1 - to a 1K resistor in series with an LED 14 Q0 - to a 1K resistor in series with an LED 15 TC - not used 16 Vcc - high

I can't get anything to happen, and can't tell what some of these pins are even for. Any help with this would be greatly appreciated, thanks

Reply to
panfilero
Loading thread data ...

Use a proper 5V supply for starters, a 7805 regulator will do the trick. 9V batteries don't last long, get yourself a small bench supply or DC plugpack. Power both chips from the 5V output of the regulator.

Connect the 555 output directly to the counter chip, do not take the output from across the LED. You will not damage the counter chip by connecting it direct.

Dave :)

Reply to
David L. Jones

Thanks, I just plugged in a 7805 and the thing started working, appreciate it.

Reply to
panfilero

A 10Meg divider doesn't provide a decent input for a HCT, I'd say.

Rene

--
Ing.Buero R.Tschaggelar - http://www.ibrtses.com
& commercial newsgroups - http://www.talkto.net
Reply to
Rene Tschaggelar

ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.