Mike_Z
Veteran Member
Over the weekend I found a Texas Instruments document "Designing with the SN54/74LS123" . It talks about how to use and what's in the chip. I use a dozen or so of these in my 8080. Mostly for the front panel controls producing pulse signals for various functions. Anyway, the first figure snagged my attention. This figure displayed the two mono's, connected up with an RC network, but what caught my attention was that the Cext terminal was grounded. I have never done this and have not experienced any trouble without this ground. So I combed over the document trying to find out why TI wants this terminal grounded. The only mention I found was, was "NOTE: For best results, system ground should be applied to the Cext terminals." and that's all I could find. The document does have a detailed internal circuit diagram of the chip. The Cext terminal is connected to internal ground, yet the circuit diagram omits the +5 pin 16 and System Ground pin 8 from the diagram. Just cause, I'm going to ground pins 6 and 14 on all my 74123's. Has anyone else had any experience with this?
Thanks
Mike
Thanks
Mike