For Video Equipment
MN676011NPS
NTSC Color Camera Synchronizing Signal Generator LSI
Overview
The MN676011NPS is a CMOS LSI that generates
NTSC color camera synchronizing signals as defined by
the EIA RS-170A standard.
It features a built-in 4fSC (14.31818 MHz) crystal oscillator circuit and divides that frequency to generate the
horizontal synchronizing signal fH (15.7 kHz), the vertical
synchronizing signal f V (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 and the burst signal gated with the burst flag
(BF) pulse.
It includes a vertical reset (VR) input pin for resetting
the leading edge of the vertical synchronizing pulse (VP)
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 synchronizing LSIs as the MN6761S.
Pin Assignment
VDD1
1
28
VDD2
VSS1
2
27
VSS2
EX4fSCI
3
26
SYNC
4fSCOSCI
4
25
VP
4fSCOSCO
5
24
WHD
SC1
6
23
BLK
SC3
7
22
CP1V
BSC
8
21
CP2
VPCO
9
20
WBLK
EXT/INT
10
19
BF
CP1
11
18
SW1
TEST
12
17
SW3
VR
13
16
SW3
EX910fHI
14
15
SW4
(TOP VIEW)
Features
Power-saving CMOS synchronizing signal generator
(conformed to EIA RS-170A standard)
Built-in 14.31818 MHz clock generator
12 signal outputs including horizontal and vertical
synchronizing signals and color subcarrier
frequency signals (The vertical synchronizing signal
is available as the VP signal output.)
Pins for switching BLK signal pulse widths
Applications
Color video cameras
SOP028-P-0375
MN676011NPS
For Video Equipment
13
VR
Block Diagram
EXT/INT
1/4
SC-Reset
1/525
1/4
14
PHASE
COMP.
9
1/455
1
18
17
1/2
2
16
28
Burst
Gate
27
15
H-Decoder
12
EX910fHI
VPCO
SW1
SW2
SW3
SW4
TEST
21
CP2
11
CP1
24
WHD
26
SYNC
23
BLK
WBLK
20
Composite Decoder
DFF
BF
CK
7
DFF
SC2
6
SC1
CK
V-Decoder
910fH
D
D
DFF
2fH
fH
19
D
fV
CP1V
VSS2
10
25
VSS1
VDD2
HV-CLK
SELECT
V-Reset
22
VDD1
SC-CLK
SELECT
VP
EXT/INT
3
8
EX4fSCI
4fSC
OSC
5
BSC
4fSCOSCI
4fSCOSCO
4
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.)
Power supply for color subcarrier frequency signal circuits
2
VSS1
Power supply
"L" level power supply
(Connect this pin to 0 V.)
Power supply for color subcarrier frequency signal circuits
28
VDD2
Power supply
"H" level power supply (Connect this pin to +5.0 ±0.5 V.)
Power supply for horizontal and vertical synchronizing
signals
27
VSS2
Power supply
"L" level power supply
(Connect this pin to 0 V.)
Power supply for horizontal and vertical synchronizing
signals
For Video Equipment
MN676011NPS
Pin Descriptions (continued)
Pin No.
4
5
Symbol
4fSCOSCI
4fSCOSCO
Pin Name
Crystal oscillator
Function Description
Connect these pins to a 14.31818-MHz crystal oscillator
input
through capacitors appropriate for VSS1 .
Crystal oscillator
output
3
EX4f SCI
External clock input
"L" level input to the EXT/INT pin (which includes a builtin feedback resistor) produces oscillation; "H" level input
stops it.
Color subcarrier frequency (4fSC) input
"H" level input to the EXT/INT pin enables external clock
input. If this pin is not used, keep it at "L" level.
14
EX910fHI
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
10
EXT/INT
External/internal
input. If this pin is not used, keep it at "L" level.
This pin switches the chip between external and internal
synchronization switch
synchronization modes.
input
"H" level input produces external synchronization;
"L" level, internal synchronization.
Incorporating pull-down resistor.
13
VR
Vertical reset input
Falling edge input resets the leading edge of the vertical
synchronizing signal (VP).
The pin includes a built-in pull-up resistor.
12
TEST
Test input
Test input
Keep this pin at "H" level.
The pin includes a built-in pull-up resistor.
9
VPCO
Phase comparator
This pin gives the results of comparing the phases of the
output
falling edge of the VR input and rising edge of the VP
output.
The output is at "H" level when the VR leads the VP and is
at "L" level when the VR trails the VP.
18
SW1
These pins control the widths of H-BLK and V-BLK pulses.
H-BLK pulse width
17
16
SW2
selection
SW2
H-BLK (µs)
L
L
10.69
H
L
10.82
L
H
10.97
H
H
11.10
SW3
SW4
V-BLK (H)
L
L
19
H
L
20
SW3
V-BLK pulse width
15
SW1
SW4
selection
L
H
21
H
H
21
MN676011NPS
For Video Equipment
Pin Descriptions (continued)
Pin No.
6
Symbol
SC1
Pin Name
fSC (R-Y) output
Function Description
Color subcarrier frequency signal (3.58 MHz) formed by
7
SC2
fSC (B-Y) output
Color subcarrier frequency signal (3.58 MHz) formed by
dividing the crystal oscillator signal (4f SC) by four.
dividing the crystal oscillator signal (4f SC) by four.
This signal lags SC1 by 90°.
8
BSC
Burst output
Burst output signal
If SC1 is the 180° signal, BSC is the 0° signal.
26
SYNC
Composite synchronizing
Composite synchronizing signal
signal output
25
VP
Vertical synchronizing
Vertical synchronizing signal output (width: 3H)
signal output
24
WHD
Wide HD output
Wide HD signal
Preblanking signal with pulse width of 9.71 µs
23
22
BLK
CP1V
Composite blanking
Composite blanking signal
signal output
See the entries for SW1– SW4 for the pulse width.
Composite clamp pulse
Composite pulse for black level playback
output
21
CP2
Clamp pulse output
Clamp pulses for luminance and color difference signals
Horizontal deflection start pulses
20
WBLK
Composite wide
Composite wide blanking signal
blanking output
This signal provides a horizontal blanking interval of
Burst flag output
Gate signal for color subcarrier frequencies
26.89 µs and a vertical blanking interval of 134.5H
19
BF
The pulse width is 2.51 µs with the vertical interval (9H)
dropped out.
11
CP1
Clamp pulse output
Pulse for black level playback
For Video Equipment
MN676011NPS
H Decoder Pulse Timing Diagram
Unit: µs
26.89
WBLK
4.75
H.Sync
Sync
2.23
EQ
4.68
V.SER
2.51
BF
1.05
CP1, CP1V
2.79
CP2
9.71
WHD
BLK
1.47
F.Porch
0.56
Sync to BF
–9.15
–1.47
–4.68
– 0.91 0.14 2.10
SW1
0
2.23 4.75
SW2
17.74
4.89
5.31
H-BLK (µs)
L
L
10.69
H
L
10.82
L
H
10.97
H
H
11.10
7.82
8.24
MN676011NPS
For Video Equipment
Pulse Timing Diagram for Composite and Vertical Synchronizing Signals
ODD
HS
EQ
VS
3H
9H
{
{
{
{
{
(Field)
2
262
{
Sync
525 1
EQ
EVEN
HS
VP
BF
BLK
CP1V
WBLK
{
{
{
{
ODD
EVEN
524
ODD
262
EVEN
524
ODD
262
EVEN
489
101
134.5H+19.3µs
ODD
227
362
134.5H+7.6µs
SW3
EVEN
SW4
V-BLK (H)
L
L
19
H
L
20
L
H
21
H
H
21
For Video Equipment
MN676011NPS
Application Circuit Example
5V
5V
10000pF
+
10µF
1 VDD1
2 VSS1
3 EX4fSCI
4 4fSCOSCI
20pF
1kΩ
10pF
18pF
14.31818MHz
5 4fSCOSCO
VDD2 28
VSS2 27
SYNC 26
VP 25
WHD 24
6 SC1
BLK 23
7 SC2
CP1V 22
8 BSC
CP2 21
9 VPCO
10 EXT/INT
WBLK 20
BF 19
11 CP1
SW1 18
12 TEST
SW2 17
13 VR
SW3 16
14 EX910fHI
SW4 15
5V
MN676011NPS
For Video Equipment
Package Dimensions (Unit: mm)
SOP028-P-0375
17.80±0.20
15
(0.65)
1.27
0.40±0.10
SEATING PLANE
+0.10
9.40±0.30
2.40max.
0.15 -0.05
7.20±0.20
14
0.10±0.10
1
1.10±0.20
2.00±0.20
28
0 to 10°
0.30min.