For Video Equipment
MN6761S
Pin Descriptions
Pin No.
Symbol
Pin Name
Power supply
Function Description
23
VDD1
"H" level (5V) power supply for subcarrier circuits
"L" level (GND) power supply for subcarrier circuits
"H" level (5V) power supply for synchronizing signal
circuits
22
8
VSS1
Power supply
Power supply
VDD2
7
9
VSS2
GLSYNC
CLBSC
WHD
fHP
Power supply
"L" level (GND) power supply for synchronizing signal
circuits
External synchronizing
signal input
Input pin for composite synchronizing signal derived from
video signal (reference for horizontal and vertical signals)
Input pin for burst subcarrier signal derived from video
signal (reference for subcarrier signals)
6
External burst
subcarrier input
Horizontal synchroni-
zation input
3
Input pin for WHD signal from synchronizing signal
generator
11
24
Monostable multi-
vibrator input
Pin for connecting CR circuit for adjusting delay for analog
monostable multivibrator (thus adjusting horizontal phase)
Input pin for SC1 signal from synchronizing signal
generator
SC1
Subcarrier input
1
2
SCPSW1
SCPSW2
LSW
Subcarrier phase
switch inputs
Pin selecting which of the four phase signals generated from
the SC1 signal goes to the phase comparator
For a PAL system, supply the LSW signal from the
synchronizing signal generator.
17
Line switch input
For an NTSC system, keep this pin at "H" level.
"H" level selects NTSC operation;
4
N/P
NTSC/PAL selection
input
"L" level, PAL operation.
12
HPCO
Horizontal phase
comparator output
This pin is at "L" level when the WHD signal, after passing
through the monostable multivibrator, leads the rising edge
of the HSYNC signal derived by separating off the
horizontal component of the GLSYNC signal and is at "H"
level when the signal lags. At all other times, it is in the
high-impedance state.
13
14
XfHOSCI
Oscillator input for
the synchronization
circuits
Clock oscillator pins for the synchronization circuits.
Connect these pins to an inductor, capacitor, and variable
capacitor. (The pins have built-in feedback resistors.)
The circuit oscillates during external synchronization mode.
The oscillation stops for internal synchronization mode.
The oscillator frequency, XfH is 14.31818 MHz (910fH) for
NTSC and 4.406 MHz (282fH) for PAL.
XfHOSCO
Oscillator output for
the synchronization
circuits
15
XfH
Clock output for
synchronizing signal
circuits
Clock output pin for synchronizing signal circuits.
This pin provides the clock (XfH) for the external
synchronization mode and stays at "L" level for the internal
synchronization mode. Connect to the EX910fHI pin of the
synchronizing signal generator for NTSC operation and to
the EX282fHI pin for PAL operation.
PANASONIC [ PANASONIC ]
