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Pin Functions
(IC51)
Pin No.
Symbol
Function
Description
1
V
SS
Ground
Ground connection
2
Xtal
IN1
Crystal oscillator connection
Connection for the crystal and capacitor used to form the crystal oscillator that generates
3
Xtal
OUT1
the internal synchronization signal. The oscillator can be selected with a command switch.
4
HSYNC
OUT
Horizontal synchronization
Outputs the horizontal synchronization signal (AFC). The output polarity can be selected
output
(metal option). Also functions as general output port (command switch).
5
Xtal
IN2
Crystal oscillator connection
Connection for the crystal and capacitor used to form the crystal oscillator that generates
6
Xtal
OUT2
the internal synchronization signal.
7
VSYNC
OUT
Vertical synchronization output
Outputs the vertical synchronization signal. The output polarity can be selected (metal
option). Also functions as general output port (command switch).
option). Also functions as general output port (command switch).
8
CS
Enable input
Enables/disables serial data input. Serial data is enabled when this pin is low (hysteresis
input). Pull-up resistor built in (metal option).
input). Pull-up resistor built in (metal option).
9
SIN
Data input
Serial data input (hysteresis input). Pull-up resistor built in (metal option).
10
SCLK
Clock input
Clock input for serial data input (hysteresis input). Pull-up resistor built in (metal option).
SECAM mode switch input/
During input, switches between SECAM and other modes.
11
SECAM
output (command switch)
During output, functions as general output port or internal V output (command switch).
Low = other modes, high = SECAM mode
Low = other modes, high = SECAM mode
525/625 switch input/output
During input, switches between 525 scan lines and 625 scan lines.
12
525/625
(command switch)
During output, functions as general output port or character data output (command switch).
Low = 525 lines, high = 625 lines
Low = 525 lines, high = 625 lines
NTSC/PAL switch input/output
Switches the color mode between NTSC and PAL.
13
NTSC/PAL
(command switch)
During output, functions as general output port or frame data output (command switch).
Low = NTSC, high = PAL
Low = NTSC, high = PAL
Switch FSC between 3.58 MHz and 4.43 MHz.
14
3.58/4.43
3.58/4.43 switch input/output
During output, functions as general output port or halftone output (command switch).
(command switch)
Low = 3.58, high = 4.43
15
RST
Reset input
System reset input pin, low is active (hysteresis input).
Pull-up resistor built in (metal option).
Pull-up resistor built in (metal option).
16
CV
OUT
Video signal output
Composite video output
17
V
DD2
Power supply connection
Power supply connection for composite video signal level generation
18
CV
IN
Video signal input
Composite video input
19
CV
CR
Video signal input
SECAM chroma signal input
20
SYNC
IN
Sync separator circuit input
Built-in sync separator circuit video signal input
21
SEP
C
Sync separator circuit
Built-in sync separator circuit
22
V
SS
Ground
Ground connection
23
PD
OUT
Control voltage output
AFC control voltage output
24
AMP
IN
AFC filter connection
Filter connection
25
AMP
OUT
26
FC
Control voltage input
AFC control voltage input
27
VCO
IN
LC oscillator connection
VCO LC oscillator circuit coil and capacitor connection
28
VCO
OUT
External synchronization signal
Outputs the exclusive NOR of the horizontal synchronization signal (AFC) and CSYNC (sync
29
SYNC
DET
detection output
separator). The output polarity can be selected (metal option). Also functions as general
output port (command switch).
output port (command switch).
30
V
DD1
Power supply connection
Power supply connection (+5 V: digital system power supply)
O.S.D IC (74763M)
No. 5039-3/19
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