Help wiring 74HCT161 4-Bit Binary Counter
Hi, does anyone know how to wire the 74HCT161 counter with a 555 chip? I
put pin3 of the 555 to pin2 on the 74HCT161 to increment the timer. For the
74HCT161, I use pin11-14 to light some LEDs, put pin 15 to Vcc, pins
1,8,9,10 to the GND. All the LEDs light up at the same time, slightly
blinking, can anyone help with this or have samples?
Thanks,
Tony
[noparse][[/noparse]Non-text portions of this message have been removed]
put pin3 of the 555 to pin2 on the 74HCT161 to increment the timer. For the
74HCT161, I use pin11-14 to light some LEDs, put pin 15 to Vcc, pins
1,8,9,10 to the GND. All the LEDs light up at the same time, slightly
blinking, can anyone help with this or have samples?
Thanks,
Tony
[noparse][[/noparse]Non-text portions of this message have been removed]
Comments
my National Semiconductors data sheets, you will find a pdf for the chip
that you can down load.
The url is http://www.lennard.net.nz
Look under the listing of TTL Mil Spec IC's for a 54161. This IC is exactly
the same in terms of functions and pinouts, it's just that the 54 series are
military spec.
Cheers,
Ben, Windy Wellington, New Zealand.
--
http://www.lennard.net.nz/
Ben Lennard, NCEE, Dip EE
Web Hosting and Electronics R&D
Club Coordinator, Victoria University of Wellington Hockey Club
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From: "Tony Suriyathep" <tonys@o...>
To: <basicstamps@yahoogroups.com>
Subject: [noparse][[/noparse]basicstamps] Help wiring 74HCT161 4-Bit Binary Counter
Date: Thu, 21 Feb 2002 7:40 PM
Hi, does anyone know how to wire the 74HCT161 counter with a 555 chip? I
put pin3 of the 555 to pin2 on the 74HCT161 to increment the timer. For the
74HCT161, I use pin11-14 to light some LEDs, put pin 15 to Vcc, pins
1,8,9,10 to the GND. All the LEDs light up at the same time, slightly
blinking, can anyone help with this or have samples?
Thanks,
Tony
[noparse][[/noparse]Non-text portions of this message have been removed]
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[noparse][[/noparse]Non-text portions of this message have been removed]
Let pin 15 (Carry Out) float.
--
Greg
Tony Suriyathep wrote:
>Hi, does anyone know how to wire the 74HCT161 counter with a 555 chip? I
>put pin3 of the 555 to pin2 on the 74HCT161 to increment the timer. For the
>74HCT161, I use pin11-14 to light some LEDs, put pin 15 to Vcc, pins
>1,8,9,10 to the GND. All the LEDs light up at the same time, slightly
>blinking, can anyone help with this or have samples?
>
>Thanks,
>Tony
attached the 74HCT161 to another 74HCT161 to try to make it count up to 8
bits. Pin 15 is set to high when the bits reach HHHH, then I attached that
pin to the clock of the other chip at pin 2. But that produces the wrong
count because when HHHH is reached it starts the next chip on H000, so the
result is HHHHH000, after that its 0000H000, which is wrong.
It would be better if Pin 15 was set high after HHHH, then it would make
more sense. How do I resolve this counting problem?
Thanks,
Tony
Original Message
From: Gregory D Wagner [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=zzdIb_wX5PubVE699yXuMIK3aeo1G0udA57ck8b4AifxHwT5qqbhv5OBS6bTL3F9_G_S1i4hkzrDggN3EIPx-ms]gregory-wagner@u...[/url
Sent: Thursday, February 21, 2002 7:09 AM
To: basicstamps@yahoogroups.com
Subject: Re: [noparse][[/noparse]basicstamps] Help wiring 74HCT161 4-Bit Binary Counter
Instead of tieing pins 1 (CLR), 9 (LOAD), 10 (T) to GND tie them to Vcc.
Let pin 15 (Carry Out) float.
--
Greg
Tony Suriyathep wrote:
>Hi, does anyone know how to wire the 74HCT161 counter with a 555 chip? I
>put pin3 of the 555 to pin2 on the 74HCT161 to increment the timer. For
the
>74HCT161, I use pin11-14 to light some LEDs, put pin 15 to Vcc, pins
>1,8,9,10 to the GND. All the LEDs light up at the same time, slightly
>blinking, can anyone help with this or have samples?
>
>Thanks,
>Tony
To UNSUBSCRIBE, just send mail to:
basicstamps-unsubscribe@yahoogroups.com
from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
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'161. Also, connect the clock to both '161s Clock (2). This is a
synchronous configuration so you lessen the likelihood of invalid states
due to ripple.
--
Greg
Tony Suriyathep wrote:
>Hi thanks for the advice, it worked great. I have another problem now, I
>attached the 74HCT161 to another 74HCT161 to try to make it count up to 8
>bits. Pin 15 is set to high when the bits reach HHHH, then I attached that
>pin to the clock of the other chip at pin 2. But that produces the wrong
>count because when HHHH is reached it starts the next chip on H000, so the
>result is HHHHH000, after that its 0000H000, which is wrong.
>
>It would be better if Pin 15 was set high after HHHH, then it would make
>more sense. How do I resolve this counting problem?
>
>Thanks,
>Tony
>
>
>
>
Original Message
>From: Gregory D Wagner [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=pqvu6mVcuz7nn_1Q4DHf1ei9Eu9PI1lHfxAKfFUwptuIBAmKlKIEAX1o_v641Yfc3H-1FoA4Yn51UOfZSO6l0oU]gregory-wagner@u...[/url
>Sent: Thursday, February 21, 2002 7:09 AM
>To: basicstamps@yahoogroups.com
>Subject: Re: [noparse][[/noparse]basicstamps] Help wiring 74HCT161 4-Bit Binary Counter
>
>
>Instead of tieing pins 1 (CLR), 9 (LOAD), 10 (T) to GND tie them to Vcc.
>Let pin 15 (Carry Out) float.
>--
>Greg
>
>Tony Suriyathep wrote:
> >Hi, does anyone know how to wire the 74HCT161 counter with a 555 chip? I
> >put pin3 of the 555 to pin2 on the 74HCT161 to increment the timer. For
>the
> >74HCT161, I use pin11-14 to light some LEDs, put pin 15 to Vcc, pins
> >1,8,9,10 to the GND. All the LEDs light up at the same time, slightly
> >blinking, can anyone help with this or have samples?
> >
> >Thanks,
> >Tony