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Systron Donner 6252

W

Willco

Jan 1, 1970
0
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
 
W

Willco

Jan 1, 1970
0
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
 
Willco said:
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

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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