LC74731W Datasheet, PDF (3/39 Pages) Sanyo Semicon Device – On-Screen Display Controller

LC74731W, LC74732W
Pin Functions
Pin No.
Pin
Function
Description
1
V_SS1
Ground
Ground connection. (Digital system ground)
2
3
Xtalin
Xtalout
Crystal oscillator connections
Connections for the crystal element and capacitors that form the internal sync signal generating
crystal oscillator. Xtalin can also be used to input an external clock signal. (2fsc or 4fsc)
Switches the crystal oscillator Selects external clock input mode or crystal oscillator mode. Low: crystal oscillator mode, high:
4
CTRL1 _input
external clock input mode.
5
OSCin
LC oscillator connections
Connections for the coil and capacitor that form the character output dot clock generation oscillator.
6
OSCout
7
MUTE Muting control input
This is an active-low input with hysteresis characteristics (MORE+).
When low, the
CVout, Yout, and Cout outputs are set to either,
(1) CSYNC, CSYNC, PE, or
(2) PE
PE,
PE.
In the initial state, (1) is selected. This setting is switched by commands.
Background color phase
8
CDLR
adjustment
Connection for the resistor used to adjust the background color phase
Outputs the result of the judgment as to whether or not the external sync signal is present.
SYNCJDG External sync signal judgment A high level is output when a sync signal is present.
9
/Rout
output (Rout output)
The dot clock (LC oscillator) is output when RST is low.
(The IC can be set up to not output this signal during resets by commands.)
Character output
10 CHARA/Gout _{(Gout output)}
Character signal output
11 BLANK/Bout Blank output (Bout output) Blank signal output pin
Internal/external output
12 IEout/BLKout _{(BLKout output)}
Internal synchronization (high)/external synchronization (low) state output pin
13 OUTMOD Output switching input
Switches between output from pins 9 to 12 and input to pin 32.
Low: normal operation, high: RGB output supported
14
CS
Enable input
Serial data input enable
Serial data input is enabled when low.
more+ (Hysteresis input characteristics)
15
SIN
Data input
Serial data input
more+ (Hysteresis input characteristics)
16
SCLK Clock input
Serial data input clock input
more+ (Hysteresis input characteristics)
17
V_DD2
Power supply
18
COUT Color signal output
Composite video signal level adjustment power supply. (Analog system power supply)
Color (C) signal output
19
NC
This pin must either be left open or connected to ground.
20
CIN
Color signal input
Color (C) signal input
21
CBIAS Chrominance bias output
Chrominance signal bias level output
22
NC
This pin must be either left open or connected to ground.
23
YOUT Luminance signal output
Luminance signal (Y) output
24
NC
This pin must be either left open or connected to ground.
25
YIN
Luminance signal input
Luminance signal (Y) input
26
V_SS2
Ground
27
CVOUT Video signal output
Ground
Composite video signal output
28
NC
This pin must either be left open or connected to ground.
29
CVIN
Video signal input
Composite video signal input
30
CVCR Video signal input
SECAM chrominance signal input
31
HFTin Halftone signal input
Halftone signal input
32
SYNin Sync separator circuit input Video signal input to the internal sync separator circuit
33
SEPout Composite sync signal output Composite sync signal output from the internal sync separator circuit
Vertical sync signal input
34
SEPin Vertical sync signal input
MORE+ (Hysteresis input characteristics)
35
RST
Reset input
System reset input
A built-in pull-up resistor can be included in this pin’s input circuit. (Hysteresis input characteristics)
36
V_DD1
Power supply (+5 V)
Power supply (+5 V: digital system power supply)
Continued on next page.
3/39