Pin Functions - Integra NAC-2.3 Service Manual

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BLOCK DIAGRAM AND DESCRIPTION OF IC - 3
Q271:LC74761M-9845
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Pin Functions

Pin No. Symbol
1 V
SS
2 Xtal
3 Xtal
OUT1
4 HSYNC
5 Xtal
6 Xtal
OUT2
7 VSYNC
8 CS
9 SIN
10 SCLK
11 SECAM
12 525/625
13 NTSC/PAL
TE
L 13942296513
14 3.58/4.43
15 RST
16 CV
OUT
17 V
DD2
18 CV
19 CV
CR
20 SYNC
21 SEP
22 V
SS
23 PD
OUT
24 AMP
25 AMP
26 FC
27 VCO
28 VCO
29 SYNC
30 V
DD1
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Function
Ground
IN1
Crystal oscillator connection
Horizontal synchronization
OUT
output
IN2
Crystal oscillator connection
Vertical synchronization output
OUT
Enable input
Data input
Clock input
SECAM mode switch input/
output (command switch)
525/625 switch input/output
(command switch)
NTSC/PAL switch input/output
(command switch)
3.58/4.43 switch input/output
(command switch)
Reset input
Video signal output
Power supply connection
Video signal input
IN
Video signal input
Sync separator circuit input
IN
Sync separator circuit
C
Ground
Control voltage output
IN
AFC filter connection
OUT
Control voltage input
IN
LC oscillator connection
OUT
External synchronization signal
DET
detection output
Power supply connection
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8
Ground connection
Connection for the crystal and capacitor used to form the crystal oscillator that generates
the internal synchronization signal. The oscillator can be selected with a command switch.
Outputs the horizontal synchronization signal (AFC). The output polarity can be selected
(metal option). Also functions as general output port (command switch).
Connection for the crystal and capacitor used to form the crystal oscillator that generates
the internal synchronization signal.
Outputs the vertical synchronization signal. The output polarity can be selected (metal
option). Also functions as general output port (command switch).
Enables/disables serial data input. Serial data is enabled when this pin is low (hysteresis
input). Pull-up resistor built in (metal option).
Serial data input (hysteresis input). Pull-up resistor built in (metal option).
Clock input for serial data input (hysteresis input). Pull-up resistor built in (metal option).
During input, switches between SECAM and other modes.
During output, functions as general output port or internal V output (command switch).
Low = other modes, high = SECAM mode
During input, switches between 525 scan lines and 625 scan lines.
During output, functions as general output port or character data output (command switch).
Low = 525 lines, high = 625 lines
Switches the color mode between NTSC and PAL.
Q Q
During output, functions as general output port or frame data output (command switch).
3 6 7 1 3
Low = NTSC, high = PAL
Switch FSC between 3.58 MHz and 4.43 MHz.
During output, functions as general output port or half-tone output (command switch).
Low = 3.58, high = 4.43
System reset input pin, low is active (hysteresis input).
Pull-up resistor built in (metal option).
Composite video output
Power supply connection for composite video signal level generation
Composite video input
SECAM chroma signal input
Built-in sync separator circuit video signal input
Built-in sync separator circuit
Ground connection
AFC control voltage output
Filter connection
AFC control voltage input
VCO LC oscillator circuit coil and capacitor connection
Outputs the exclusive NOR of the horizontal synchronization signal (AFC) and CSYNC (sync
separator). The output polarity can be selected (metal option). Also functions as general
output port (command switch).
Power supply connection (+5 V: digital system power supply)
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2 9 9 4 2 8
Description
1 5 0 5 8 2 9 9 4
m
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NAC-2.3
9 9
2 8 9 9