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DC504: Difference between revisions

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DC504 (view source)

Revision as of 08:49, 19 November 2023

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==Rear Interface==
==Rear Interface==
* 28A − Hold
<small>
* 28B − Gate Out, Totalize Start/Stop
{|
* 27B − Decimal point
|-
* 26A − /Reset
| 28B − Gate Out, Totalize Start/Stop || 28A − Hold 
* 25A − TS1 (digit select 1, MSD)  
|-
* 24B − Scan clock out
| 27B − Decimal point   ||
* 24A − TS2 (digit select 2)
|-
* 23B − Overflow
|              || 26A − /Reset
* 23A − TS3 (digit select 3)
|-
* 22A − TS4 (digit select 4)
|              || 25A − TS1 (digit select 1, MSD)  
* 21B − BCD out 2
|-
* 21A − TS5 (digit select 5, LSD)
| 24B − Scan clock out || 24A − TS2 (digit select 2)
* 20B − BCD out 8
|-
* 20A − BCD out 4
| 23B − Overflow || 23A − TS3 (digit select 3)
* 19B − Latch Out (Data Good)
|-
* 19A − BCD out 1
| 22A − TS4 (digit select 4) ||
* 16A − Signal input (GND on 17A)
|-
* 14A − External Clock (GND on 15A)
| 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}}
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