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LC74788JM Fiches technique(PDF) 2 Page - Sanyo Semicon Device |
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LC74788JM Fiches technique(HTML) 2 Page - Sanyo Semicon Device |
2 / 23 page Pin Assignment No. 5731-2/23 LC74788, 74788M, 74788JM Pin Functions Pin no. Pin Function Notes 1 VSS1 Ground Ground connection (digital system ground) 2 XtalIN These pins are used either to connect the crystal and capacitors used to form an external Crystal oscillator crystal oscillator circuit to generate the internal synchronizing signals, or to input an external XtalOUT (MUTE input) clock signal (2fsc or 4fsc). As a mask option, the XtalOUT pin can be set to function as the 3 (MUTE) MUTE input pin. When this pin is set low, the video output is held at the pedestal level. (A pull- up resistor is built in and the input has hysteresis characteristics.) Switches the mode between external clock input and crystal oscillator operation. A low level 4 CTRL1 Crystal oscillator input switching selects crystal oscillator operation and a high level selects external clock input. As a mask (CHABLK) (CHABLK output) option, the CTRL1 input pin can be set to function as the CHABLK (character · frame) output. This is a 3-value output. 5 HFTONOUT Background line output Outputs the range signal specified by LNA*, LNB*, and LNC*. Outputs the crystal oscillator clock when RST is low. (This signal is not output after a reset command is executed.) 6 OSCIN LC oscillator Connections for the inductor and capacitor that form the character output dot clock generation 7 OSCOUT oscillator. Outputs the state of the external synchronizing signal presence/absence judgment. Outputs a 8 SYNCJDG External synchronizing signal high level when synchronizing signals are present. judgment output Outputs the dot clock (LC oscillator) when RST is low. (This signal is not output on command resets.) 9 CS Enable input Serial data input circuit enable pin. Serial data input is enabled when a low level is input. A pull-up resistor is built in. (This input has hysteresis characteristics.) 10 SCLK Clock input Serial data input circuit clock input. A pull-up resistor is built in. (This input has hysteresis characteristics.) 11 SIN Data input Serial data input. A pull-up resistor is built in. (This input has hysteresis characteristics.) 12 VDD2 Power supply Composite video signal level adjustment power supply (analog system power supply) Continued on next page. A08688 LC74788 LC74788M LC74788JM |
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