O.s.d Ic (74763M); Pin Functions (Ic51) - Harman Kardon AVR135 Service Manual

AVR135

Pin Functions (IC51)

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

O.S.D IC (74763M)

79
harman/kardon
Description