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MC144144 bảng dữ liệu(PDF) 4 Page - Motorola, Inc |
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MC144144 bảng dữ liệu(HTML) 4 Page - Motorola, Inc |
4 / 44 page MC144144 MOTOROLA 4 AC AND TIMING CHARACTERISTICS Parameter Conditions Composite Video Input Amplitude: 1.0 Vp–p, ± 3 dB Polarity: Sync tips negative Bandwidth: 600 kHz Signal Type: Interlaced Max Input R: 470 Ω DC Offset: Signal to be ac coupled with a minimum series capacitance of 0.1 µF. Non–Standard Video Signals Must Have the Following Characteristics Sync Amplitude: 200 mV min Vert Pulse Width: 3H ± 0.5H Vert Pulse Tilt: 20 mV max H Timing: Phase Step (head switch) ± 10 µs max Fh Deviation (long term) ± 0.5% max Fh p–p Deviation (short term) ± 0.3% max Horizontal Signal Input (Preferably H Flyback) Amplitude: CMOS level signal, low ≤ 0.2 VCC, high ≥ 0.7 VCC Video Lock Mode: Polarity: Frequency: Any 15,734.263 Hz, ± 3% HIN Lock Mode: Polarity: Frequency: Any Display HFB pulse Line 21 Input Parameters ( at 1.0 Vp–p) (Line 21 must be in its proper position to the leading edge of the vertical sync signal.) Code Amplitude: 50 IRE ± 10 IRE Code Zero Level: – 5 IRE, + 15 IRE relative to back porch Bit Rate: 32 x Fh Start of Code: 10.5 ± 1.0 µs (Measured from the midpoint of the leading edge of video H pulse to the midpoint of the rising edge of the first clock run–in cycle.) Start of Data: 3.972 µs, – 0.00 µs, + 0.30 µs (Measured from the midpoint of the falling edge of the last clock run–in cycle to the midpoint of the rising edge of the start bit.) Input Signal–to–Random Noise Performance Unit will function down to a 25 dB ratio (CCIR weighted One error per row or better at that level. Internal Sync Circuits The internal sync circuits will lock to all 525 line or 625 line signals having a vertical sync pulse. It is at least 2 H long. It starts at the proper 2 H boundary for its field. If equalizing pulse serrations are present they must be less than 0.125 H in width. Timing Signals Dot Clock: 768 x FH = 12.0839 MHz Dot Period: 82.75 ns Character Cell Width: 1.324 µs (tH ÷ 48) Width of Row (Box): 45.018 µs (34 chars = 17/24 x tH) Width of Row (Char): 42.370 µs (32 chars = 2/3 x tH) |
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