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Help wiring 74HCT161 4-Bit Binary Counter — Parallax Forums

Help wiring 74HCT161 4-Bit Binary Counter

ArchiverArchiver Posts: 46,084
edited 2002-02-26 17:52 in General Discussion
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]

Comments

  • ArchiverArchiver Posts: 46,084
    edited 2002-02-21 08:43
    If you go to my web site and click on Electronics, then click on the link to
    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

    Hm: +64 4 972 7567
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    87 Spencer Street
    Crofton Downs
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    half empty. To the engineer, the glass is twice as big as it needs to be."

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    Dog next door is living on borrowed time, let me tell you! Those of you
    with an overwhelming fear of the unknown will be gratified to learn that
    there is no hidden message revealed by reading this warning backwards.



    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]
  • ArchiverArchiver Posts: 46,084
    edited 2002-02-21 15:08
    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
  • ArchiverArchiver Posts: 46,084
    edited 2002-02-23 20:07
    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=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.


    Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
  • ArchiverArchiver Posts: 46,084
    edited 2002-02-26 17:52
    Connect the Carry Out (15) of the first '161 to the TE (10) of the second
    '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
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