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| For Video Equipment MN67603NS NTSC Color Camera Synchronizing Signal Generator LSI Overview The MN67603NS is a CMOS LSI that generates NTSC color camera synchronizing signals as defined by the EIA RS-170A standard. It features a built-in 4f SC (14.31818 MHz) crystal oscillator circuit and divides that frequency to generate the horizontal synchronizing signal fH (15.7 kHz), the vertical synchronizing signal fV (60 Hz), and the composite synchronizing signal. It also divides the 4fSC clock signal frequency by four to generate the color subcarrier frequency signals SC1 and SC2. It includes a vertical reset (VR) input pin for resetting the leading edge of the V-SERATION (3H) signal with the falling edge of the input signal. It also includes separate clock input pins for the color subcarrier frequency signal circuits and the synchronizing signal circuits to permit synchronization with such external synchronization LSIs as the MN6761S. Pin Assignment VDD1 VSS1 EX4fSCI 4fSCOSCI 4fSCOSCO SC1 SC2 EXT/INT VR TEST2 EX910fHI 1 2 3 4 5 6 7 8 9 10 11 22 21 20 19 18 17 16 15 14 13 12 VDD2 VSS2 SYNC VD WHD BLK HD CP2 WBLK BF TEST1 (TOP VIEW) SOP022-P-0375 Features Power-saving CMOS synchronization signal generator (conformed to EIA RS-170A standard) Built-in 14.31818 MHz clock generator 10 signal outputs including horizontal and vertical synchronization signals and color subcarrier frequency signals Applications Color video cameras MN67603NS Block Diagram EXT/INT For Video Equipment VR 4fSCOSCI 4fSCOSCO 4 5 9 8 4fSC OSC 11 EX910fHI EX4fSCI 3 SC-CLK SELECT SC reset 1/4 1/4 GATE (Dead zone) V reset 1/525 1/2 fV V-Decoder fH 2fH HV-CLK SELECT 1/455 VDD1 VSS1 VDD2 VSS2 1 2 22 21 910fH H-Decoder 12 Composite Decoder TEST1 TEST2 10 19 13 14 17 20 18 16 HD SC1 SC2 WBLK SYNC WHD BLK Pin Descriptions Pin No. 1 2 22 Symbol VDD1 VSS1 VDD2 Pin Name Power supply Power supply Power supply Function Description "H" level power supply (Connect this pin to +5.0 0.5 V.) Power supply for color subcarrier frequency signal circuits "L" level power supply (Connect this pin to 0 V.) Power supply for color subcarrier frequency signal circuits "H" level power supply (Connect this pin to +5.0 0.5 V.) Power supply for horizontal and vertical synchronizing signals 21 VSS2 Power supply "L" level power supply signals 4 5 4fSCOSCI 4f SCOSCO Crystal oscillator input Crystal oscillator output Connect these pins to a 14.31818-MHz crystal oscillator through capacitors appropriate for VSS1. "L" level input to the EXT/INT pin (which includes a built-in feedback resistor) produces oscillation; "H" level input stops it. (Connect this pin to 0 V.) Power supply for horizontal and vertical synchronizing CP2 VD BF 15 6 7 For Video Equipment Pin Descriptions (continued) Pin No. 3 Symbol EX4f SCI Pin Name External clock input MN67603NS Function Description Color subcarrier frequency (4fSC = 14.31818 MHz) input "H" level input to the EXT/INT pin enables external clock input. If this pin is not used, keep it at "L" level. 11 EX910fSCI External clock input External 910fH (14.31818 MHz) input for horizontal and vertical synchronizing signals "H" level input to the EXT/INT pin enables external clock input. If this pin is not used, keep it at "L" level. 8 EXT/INT External/internal synchronization switch input This pin switches the chip between external and internal synchronization modes. "H" level input produces external synchronization; "L" level, internal synchronization. When this pin detects falling edge input, synchronizing signals are reset to the leading edge of the V-SERATION signal. The pin includes a built-in pull-up resistor. 9 VR Vertical reset input 12 10 6 7 TEST1 TEST2 SC1 SC2 Test input Test input fSC (R-Y) output fSC (B-Y) output Test input Test input Keep this pin at "H" level. Keep this pin at "H" level. The pin includes a built-in pull-up resistor. The pin includes a built-in pull-up resistor. Color subcarrier frequency signal (3.58 MHz) formed by dividing the crystal oscillator signal (4f SC) by four. Color subcarrier frequency signal (3.58 MHz) formed by dividing the crystal oscillator signal (4f SC) by four. This signal lags SC1 by 90. 20 19 18 17 SYNC VD WHD BLK Composite synchronizing signal output Vertical drive output Wide HD output Composite blanking signal output 16 15 14 HD CP2 WBLK Horizontal drive output Clamp pulse output Composite wide blanking output 13 BF Burst flag output Clamp pulses for luminance and color difference signals Horizontal deflection start pulses Composite wide blanking signal This signal provides a horizontal blanking interval of 26.89 s and a vertical blanking interval of 134.5H. Gate signal for color subcarrier frequencies The pulse width is 2.51 s with the vertical interval (9H) dropped out. Vertical drive output pin (9H) Wide HD signal Preblanking signal with pulse width of 9.71 s Composite blanking signal This signal provides a horizontal blanking interval of 10.83 s and a vertical blanking interval of 21H. Horizontal drive output signal Composite synchronizing signal MN67603NS H Decoder Pulse Timing Diagram For Video Equipment 1H=63.55s Unit: s 26.89 WBLK H. Sync Sync EQ V. SER BF CP2 6.36 HD 9.71 WHD 10.83 BLK F. Porch Sync to BF Sync to BLK End 9.36 1.47 0.56 2.79 2.51 2.23 4.68 4.75 -9.15 -4.68 -1.47 2.10 0 2.23 4.75 4.89 5.31 7.82 8.24 17.74 9.36 For Video Equipment Pulse Timing Diagram for Composite and Vertical Synchronizing Signals MN67603NS Sync { { { { HS EQ VS 3H 9H EQ VD BF BLK WBLK { { { { HS 23 285 101 362 { 525 1 2 (Field) ODD EVEN 262 ODD EVEN 524 21H+10.9s 262 ODD EVEN ODD EVEN 21H 489 134.5H+19.3s 227 134.5H+7.6s MN67603NS Application Circuit Example For Video Equipment VDD 10000pF 1 2 3 4 VDD1 VSS1 EX4fSCI 4fSCOSCI 4fSCOSCO SC1 SC2 EXT/INT VR VDD2 22 VSS2 21 SYNC 20 VD 19 WHD 18 BLK 17 HD 16 CP2 15 WBLK 14 BF 13 TEST1 12 10F + 33pF x 2 14.31818MHz 5 6 7 8 9 10 TEST2 11 EX910fHI For Video Equipment Package Dimensions (Unit: mm) SOP022-P-0375 MN67603NS 15.300.20 22 12 1.100.20 7.200.20 9.400.30 0.15 -0.05 +0.10 0 to 10 0.30min. 1 11 2.40max. 2.000.20 (1.29) 1.27 0.400.10 SEATING PLANE 0.100.10 |
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