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GS4881 Scheda tecnica(PDF) 5 Page - Gennum Corporation |
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GS4881 Scheda tecnica(HTML) 5 Page - Gennum Corporation |
5 / 29 page GS1881, GS4881, GS4981 Monolithic Video Sync Separators Data Sheet 6926 - 5 November 2009 5 of 29 Proprietary & Confidential 2.2 GS4881 Electrical Characteristics Table 2-2 shows the electrical characteristics of the GS4881 where conditions are VCC = 5V, RSET = 680kΩ, TA =25°C, unless otherwise shown. (b) VOL Ι OL = 1.6mA – 0.3 0.6 V NOTES: 1. When placing the RSET resistor and the 0.1μF decoupling capacitor, careful attention should be made to ensure that they are as close as possible to Pin 6. Care should also be taken to avoid parasitic capacitive coupling from any output pin (Pins 1, 3, 5 and 7) to Pin 6. 2. Measured from slicing point of input falling edge to 50% point of composite sync falling edge. Table 2-1: GS1881 Electrical Characteristics (Continued) Parameter Conditions Min Typ Max Units Table 2-2: GS4881 Electrical Characteristics Parameter Conditions Min Typ Max Units Supply Voltage – 4.5 5 13.2 V Supply Current Outputs at Logic 1 VCC = 5V – 4.6 30 mA VCC = 12V – 5.0 6.5 mA Video Input (Pin 2) (a) Signal Level VCC = 5V 0.5 – 4 Vp-p (b) Clamp Current Charge 500 650 850 μA Discharge - normal 9 11 13 μA Discharge - Nosync flag raised 65 95 115 μA (c) Delay to raising of Nosync flag Video input held high 64 95 130 μs (d) Sync Tip Clamp Voltage – – 1.55 – V Sync Slice Level Relative to sync tip clamp voltage 70 77 84 mV RSET Pin Reference Voltage (Pin 6) See Note 1. 1.14 1.24 1.34 V Composite Sync Out (Pin 1) See Note 2. CL = 15p 40 60 80 ns Delay from Video Back Porch Pulse Out (Pin 5) (a) Delay from Rising Edge of Sync CL = 15p 400 500 650 ns (b) Pulse Width 2.0 2.5 3.2 μs (c) Occurrence Rate H H H – Vertical Sync Out (Pin 3) (a) Pulse Width Serrations during vertical interval 197.7 197.7 197.7 μs (b) Default Starting Time No serrations during vertical interval 48 65 82 μs |
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