Substitute : A255D , TDA 2590 , TDA 2591
Functions :
- Sync separator
- Vertical Sync Separator
- AFC
- Hoorizontal Sync Separator
- Burs gating and Horizontal blanking pulse generator
| Pin No. | Fuctions | Voltage |
| 1. | Positive (+Ve)Supply voltage | 12 |
| 2. | Positive (+Ve)Supply voltage output srage ( Tringger pulse input ) | 12 |
| 3. | Horizontal tringer pulse output ( 15625Hz.) | 1.2 |
| 4. | Selection of output pulse duration | 0 |
| 5. | Decoupling Capacitor | 6.5 |
| 6. | Horizontal flyback (blankimg)pulse (15625Hz.) for 2nd phase coparator | 0.2 |
| 7. | Sandcastle (horizontal blanking pulse ) output (15625Hz.) | 1.8 |
| 8. | Vertical sync output (50Hz.) | 0.2 |
| 9. | Sync pulse input | 1.6 |
| 10. | Noise separator input | 2.2 |
| 11. | VCR switching ( Coincidence ) | 5.7 |
| 12. | Time constant switching (third phase comparator ) | 2.2 |
| 13. | Fist phase comparator output | 6.1 |
| 14. | Ramp ( sawtooth ) oscillator capacitance | 6 |
| 15. | Horizontal frequency (15625Hz.) adjust (H-Hold) | 6 |
| 16. | Ground (-Ve) supply voltage | 0 |
