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Systron Donner 6252

Discussion in 'Electronic Equipment' started by Willco, Nov 5, 2004.

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  1. Willco

    Willco Guest

    I'm looking for a custom IC marked 527 55178 it's used in a motorola
    S1344AAB Frequency Counter/Auto Tune Deviation Meter.

    It was Manufactured for Motorola by Systron Donner. Systron Donner's
    model number was SLN6407A-75. SD also manufactured a frequency counter
    model 6252. The 6252 is identical to the counter section of the 1344AAB

    The chip is a counter/latch with tristate outputs. I was able to
    Identify some input ie clock and output enable carry. But the other
    inputs unknown.

    Jack
    Willco Electronics
     
  2. Willco

    Willco Guest

    I'm looking for a custom IC marked 528 55178 it's used in a motorola
    S1344AAB Frequency Counter/Auto Tune Deviation Meter. The Motorola
    part number is 51-80329A60

    In the early 70's the unit was Manufactured by Systron Donner for
    Motorola. Systron Donner's model number was SLN6407A-75. They also
    manufactured a frequency counter model 6252 that is identical to the
    counter section of the 1344AAB

    The chip is a counter/latch with tri-state outputs. I was able to
    Identify some input ie clock and output enable carry. But the other
    inputs are unknown.




    Jack
    Willco Electronics
     
  3. Guest

    I have an SD 6152A counter and the manual for it. These date from about
    1972. The chart in the parts lists shows that most of the digital ICs
    have standard TTL part numbers, along with an SD part number. I can't
    find anything exactly like yours, but here is the info on some counters
    and latches, if it helps:

    Quad Latch - SD 19710 - TI SN7475N - Mot MC7475P - Nat DM8075
    Quad Latch - SD 25731 - TI SN7075N
    Decade Counter - SD 19711 - TI SN7490N - Mot MC7490P - Nat DM8090
    Decade Counter - SD 25732 - TI SN7090N
    Binary Counter - SD 25727 - Sig N8281A
    Binary Counter - SD 25722 - Sig N8280A

    Matt Roberds
     
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