LC74789JM View Datasheet(PDF) - SANYO -> Panasonic

Part Name

Description

View to exact match

LC74789JM

On-Screen Display Controller

SANYO -> Panasonic 

Pin Assignment

LC74789, 74789M, 74789JM

Pin Functions

A08696

Pin No.

1

2

Pin Name

VSS1

XtalIN

3

XtalOUT

(MUTE)

Function

Ground

Crystal oscillator

(MUTE input)

CTRL1 Crystal oscillator input switching

4

(CHABLK)

(CHABLK output)

5 HFTONOUT

6

OSCIN

7

OSCOUT

Background line output

LC oscillator

External synchronizing signal

8

SYNCJDG

judgment output

9

CS

10

SCLK

11

SIN

12

VDD2

Enable input

Clock input

Data input

Power supply

Notes

Ground connection (digital system ground)

These pins are used either to connect the crystal and capacitors used to form an external

crystal oscillator circuit to generate the internal synchronizing signals, or to input an external

clock signal (2fsc or 4fsc). As a mask option, the XtalOUT pin can be set to function as the

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

selects crystal oscillator operation and a high level selects external clock input. As a mask

option, the CTRL1 input pin can be set to function as the CHABLK (character · frame) output.

This is a 3-value 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.)

Connections for the inductor and capacitor that form the character output dot clock generation

oscillator

Outputs the state of the external synchronizing signal presence/absence judgment. Outputs a

high level when synchronizing signals are present.

Outputs the dot clock (LC oscillator) when RST is low. (This signal is not output on command

resets.)

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.)

Serial data input circuit clock input.

A pull-up resistor is built in. (This input has hysteresis characteristics.)

Serial data input.

A pull-up resistor is built in. (This input has hysteresis characteristics.)

Composite video signal level adjustment power supply (analog system power supply)

Continued on next page.

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