For Video Equipment
MN67603NS
NTSC Color Camera Synchronizing Signal Generator LSI
Overview
The MN67603NS is a CMOS LSI that generates NTSC
color camera synchronizing signals as defined by the EIA
RS-170A standard.
It features a built-in 4f SC (14.31818 MHz) crystal oscillator circuit and divides that frequency to generate the
horizontal synchronizing signal fH (15.7 kHz), the vertical synchronizing signal fV (60 Hz), and the composite
synchronizing signal.
It also divides the 4fSC clock signal frequency by four
to generate the color subcarrier frequency signals SC1
and SC2.
It includes a vertical reset (VR) input pin for resetting
the leading edge of the V-SERATION (3H) signal with
the falling edge of the input signal.
It also includes separate clock input pins for the color
subcarrier frequency signal circuits and the synchronizing signal circuits to permit synchronization with such
external synchronization LSIs as the MN6761S.
Pin Assignment
VDD1
1
22
VDD2
VSS1
2
21
VSS2
EX4fSCI
3
20
SYNC
4fSCOSCI
4
19
VD
4fSCOSCO
5
18
WHD
SC1
6
17
BLK
SC2
7
16
HD
EXT/INT
8
15
CP2
VR
9
14
WBLK
TEST2
10
13
BF
EX910fHI
11
12
TEST1
(TOP VIEW)
SOP022-P-0375
Features
Power-saving CMOS synchronization signal
generator (conformed to EIA RS-170A standard)
Built-in 14.31818 MHz clock generator
10 signal outputs including horizontal and vertical
synchronization signals and color subcarrier
frequency signals
Applications
Color video cameras
MN67603NS
For Video Equipment
9
8
VR
EXT/INT
Block Diagram
4fSCOSCI
4fSCOSCO
EX4fSCI
4
3
11
4fSC
OSC
5
HV-CLK
SELECT
GATE
(Dead zone)
SC-CLK
SELECT
EX910fHI
V reset
SC reset
1/4
1/4
1/455
1/525
1/2
12
22
TEST1
15
TEST2
CP2
16
HD
18
10
WHD
20
SYNC
17
BLK
19
14
WBLK
BF
SC1
13
Composite Decoder
21
6
VSS2
2
VD
VDD2
910fH
2fH
H-Decoder
V-Decoder
7
VSS1
fH
fV
1
SC2
VDD1
Pin Descriptions
Pin No.
1
Symbol
VDD1
Pin Name
Power supply
Function Description
"H" level power supply (Connect this pin to +5.0 ±0.5 V.)
2
VSS1
Power supply
"L" level power supply
22
VDD2
Power supply
"H" level power supply (Connect this pin to +5.0 ±0.5 V.)
Power supply for color subcarrier frequency signal circuits
(Connect this pin to 0 V.)
Power supply for color subcarrier frequency signal circuits
Power supply for horizontal and vertical synchronizing
signals
21
VSS2
Power supply
"L" level power supply
(Connect this pin to 0 V.)
Power supply for horizontal and vertical synchronizing
signals
4
4fSCOSCI
5
4f SCOSCO
Crystal oscillator
Connect these pins to a 14.31818-MHz crystal oscillator
input
through capacitors appropriate for VSS1. "L" level input to
Crystal oscillator
the EXT/INT pin (which includes a built-in feedback
output
resistor) produces oscillation; "H" level input stops it.
For Video Equipment
MN67603NS
Pin Descriptions (continued)
Pin No.
3
Symbol
EX4f SCI
Pin Name
External clock input
Function Description
Color subcarrier frequency (4fSC = 14.31818 MHz) input
"H" level input to the EXT/INT pin enables external clock
input. If this pin is not used, keep it at "L" level.
11
EX910fSCI
External clock input
External 910fH (14.31818 MHz) input for horizontal and
vertical synchronizing signals
"H" level input to the EXT/INT pin enables external clock
input. If this pin is not used, keep it at "L" level.
8
9
EXT/INT
VR
External/internal
This pin switches the chip between external and internal
synchronization switch
synchronization modes.
input
"H" level input produces external synchronization;
Vertical reset input
"L" level, internal synchronization.
When this pin detects falling edge input, synchronizing
signals are reset to the leading edge of the V-SERATION
signal.
The pin includes a built-in pull-up resistor.
12
TEST1
Test input
Test input
Keep this pin at "H" level.
The pin includes a built-in pull-up resistor.
10
TEST2
Test input
Test input
Keep this pin at "H" level.
The pin includes a built-in pull-up resistor.
6
SC1
fSC (R-Y) output
Color subcarrier frequency signal (3.58 MHz) formed by
dividing the crystal oscillator signal (4f SC) by four.
7
SC2
fSC (B-Y) output
Color subcarrier frequency signal (3.58 MHz) formed by
dividing the crystal oscillator signal (4f SC) by four.
This signal lags SC1 by 90°.
20
SYNC
19
VD
18
WHD
Composite synchronizing
Composite synchronizing signal
signal output
Vertical drive output
Wide HD output
Vertical drive output pin (9H)
Wide HD signal
Preblanking signal with pulse width of 9.71 µs
17
BLK
Composite blanking
Composite blanking signal
signal output
This signal provides a horizontal blanking interval of
10.83 µs and a vertical blanking interval of 21H.
16
HD
15
CP2
14
WBLK
Horizontal drive
Horizontal drive output signal
output
Clamp pulse output
Clamp pulses for luminance and color difference signals
Horizontal deflection start pulses
Composite wide blanking
output
Composite wide blanking signal
This signal provides a horizontal blanking interval of
26.89 µs and a vertical blanking interval of 134.5H.
13
BF
Burst flag output
Gate signal for color subcarrier frequencies
The pulse width is 2.51 µs with the vertical interval (9H)
dropped out.
MN67603NS
For Video Equipment
H Decoder Pulse Timing Diagram
1H=63.55µs
Unit: µs
26.89
WBLK
4.75
H. Sync
Sync
2.23
EQ
4.68
V. SER
2.51
BF
2.79
CP2
6.36
HD
9.71
WHD
10.83
BLK
1.47
F. Porch
0.56
Sync to BF
9.36
Sync to
BLK End
–9.15
–4.68
–1.47
17.74
0
2.10
2.23
4.75
4.89
5.31
7.82
8.24
9.36
For Video Equipment
MN67603NS
Pulse Timing Diagram for Composite and Vertical Synchronizing Signals
HS
EQ
VS
3H
9H
EQ
{
262
{
{
{
{
{
Sync
(Field)
ODD
525 1 2
EVEN
HS
VD
BF
BLK
WBLK
{
{
{
ODD
EVEN
524
23
21H+10.9µs
ODD
285
262
21H
EVEN
489
101
134.5H+19.3µs
ODD
362
227
134.5H+7.6µs
EVEN
MN67603NS
For Video Equipment
Application Circuit Example
VDD
+
10000pF
10µF
33pF × 2
1
VDD1
VDD2 22
2
VSS1
VSS2 21
3
EX4fSCI
4
4fSCOSCI
5
4fSCOSCO
6
SC1
BLK 17
7
SC2
HD 16
8
EXT/INT
CP2 15
9
VR
SYNC 20
VD 19
WHD 18
14.31818MHz
10 TEST2
11 EX910fHI
WBLK 14
BF 13
TEST1 12
For Video Equipment
MN67603NS
Package Dimensions (Unit: mm)
SOP022-P-0375
15.30±0.20
12
22
+0.10
0.15 -0.05
9.40±0.30
7.20±0.20
1.10±0.20
0 to 10°
0.30min.
1.27
0.40±0.10
SEATING PLANE
0.10±0.10
(1.29)
2.40max.
11
2.00±0.20
1