trouble with logic counters

Jan 02, 2007 2 Replies

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



panfilero wrote: > 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: >

You appear to have things properly tied hi/lo except for one minor detail. You need a proper power supply to run it. A pair of 10 Meg ohm resistors does not fill the bill. A 7805 regulator on your battery would do it but a line powered supply would be better yet. You're on the right track but you need an engine.

Happy New Year

GG

Yes sir, I just plugged in a 7805 and the thing started working, thanks for the help

Happy New Year.

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