Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Teledyne Semi. obsolete IC info needed

Teledyne Semi. obsolete IC info needed

Teledyne Semi. obsolete IC info needed

I am looking for the data sheets and/or description of the pinouts for the following Teledyne Semiconductor digital devices  (late 60's to early 70's vintage):

 312CJ  ;   321CJ  ;   342CJ

Note:  I have previously searched many sources including www.freetradezone with no success.  If you suggest a source, please check it out first to be sure that the information that I am seeking is really available on that site.  Perhaps someone with an old copy of an IC Master might have this information.  Thanks in advance to anyone that can help me.

RE: Teledyne Semi. obsolete IC info needed

Do you have a working circuit you want to understand or are you trying to repair one ? do you  have schematics ?


RE: Teledyne Semi. obsolete IC info needed

Yes, I have a working circuit with schematics.  I have determined some of the circuitry based on the limited information available, but I still have questions on some connections.   Ultimately, I want to be able to replace these components in the future with available parts, if/when there is a failure.  These digital devices are similiar to, but are not an exact drop in for Motorola or TI devices back in the early 70's.   The pin outs are different and there are different and/or addtional connections.  I also looked at old copies of Electronics World, Popular Electronics, and other electronic magazines from the 70's to find if  these devices were utilized in other designs. I only found a couple of designs using Teledyne Semiconductor devices with limited usefulness, mostly TI and Mot. devices were utilized back then.

RE: Teledyne Semi. obsolete IC info needed

These devices must be RTL or DTL logic, so very simple.
I think you could replace them with 14/16 pin modules
based on surface mount parts.

It may be worth ro redesign the whole thing, today it must be much easier.


RE: Teledyne Semi. obsolete IC info needed

YES, replacing them with SMD modules would work well.

However, there are a couple of connections that I am trying to understand what they are for, and that is why I am trying to locate the pinouts or data sheets. These devices are located on 3 separate PC Boards, so redesigning them, although fun, is not what I have time for right now.  I would rather plug in an equivalent DIP module based on a surface mount device, if needed, in the existing board(s) for now.   Thanks nbucska for your thoughts on this problem.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close