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==Rear Interface== | ==Rear Interface== | ||
<small> | |||
{| | |||
|- | |||
| 28B − Gate Out, Totalize Start/Stop || 28A − Hold | |||
|- | |||
| 27B − Decimal point || | |||
|- | |||
| || 26A − /Reset | |||
|- | |||
| || 25A − TS1 (digit select 1, MSD) | |||
|- | |||
| 24B − Scan clock out || 24A − TS2 (digit select 2) | |||
|- | |||
| 23B − Overflow || 23A − TS3 (digit select 3) | |||
|- | |||
| 22A − TS4 (digit select 4) || | |||
|- | |||
| 21B − BCD out 2 || 21A − TS5 (digit select 5, LSD) | |||
|- | |||
| 20B − BCD out 8 || 20A − BCD out 4 | |||
|- | |||
| 19B − Latch Out (Data Good) || 19A − BCD out 1 | |||
|- | |||
| || 17 A – Signal Input GND | |||
|- | |||
| || 16A − Signal input | |||
|- | |||
| || 15A – External Clock GND | |||
|- | |||
| || 14A − External Clock (GND on 15A) | |||
|} | |||
</small> | |||
==Internals== | ==Internals== | ||
The DC504 uses a [[Media:Mostek MK5009P.pdf|Mostek MK5009P]] PMOS oscillator/counter IC to control gate times. | The DC504 uses a [[Media:Mostek MK5009P.pdf|Mostek MK5009P]] PMOS oscillator/counter IC to control gate times. | ||
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DC504-inside-copper-side.jpg|DC504 inside; copper side | DC504-inside-copper-side.jpg|DC504 inside; copper side | ||
</gallery> | </gallery> | ||
==Components== | |||
{{Parts|DC504}} |