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Systron Donner 6252

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

Reply to
Willco
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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

Reply to
Willco

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

Reply to
mroberds

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