MN6761 PANASONIC [Panasonic Semiconductor], MN6761 Datasheet - Page 4

• Manufacturer Part Number: MN6761
• Description: External Synchronization Control LSI for Color Video Cameras
• Manufacturer: PANASONIC [Panasonic Semiconductor]

MN6761S
Pin No.
Pin Descriptions (continued)
16
25
26
27
28
18
19
20
21
10
5
LSWCONT
4f
4f
EXT/INT
Symbol
SCPCO
TEST1
TEST2
SC
HBLK
SC
BGP
4f
VR
OSCO
OSCI
SC
Vertical reset output
Subcarrier phase
comparator output
Oscillator input for
subcarrier circuits
Oscillator output for
subcarrier circuits
Subcarrier clock output
Line switch polarity
control output
Automatic internal/
external switching
output
Burst gate pulse output
Horizontal blanking
output
Test inputs
Pin Name
This pin generates a vertical reset pulse for the
V-SERATION interval detected in the GLSYNC signal.
Connect it to the VR pin of the synchronizing signal
generator.
GLBSC signal and is at "H" level when the signal lags.
At all other times, it is in the high-impedance state.
Clock oscillator pins for the subcarrier circuits.
Connect these pins to a crystal oscillator, 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, 4f
and 14.734 MHz for PAL.
Clock output from subcarrier circuits.
In external synchronization mode, this pin provides the
(4f
remains at "L" level. Connect this pin to the EX4f
the synchronizing signal generator.
During PAL operation, this pin emits an error detection
pulse if the LSW polarity is wrong, and the chip reverses
the LSW polarity. During internal synchronization mode,
this pin remains at "L" level. Connect this pin to the
LSWCONT pin on the synchronizing signal generator.
If the chip detects GLSYNC input, it switches to external
synchronization mode and drives this pin at "H" level.
Otherwise, it switches to internal synchronization mode and
drives this pin at "L" level. Connect this pin to the EXT/INT
pin on the synchronizing signal generator.
These pulses have a width of 2.5 µs (NTSC) or 2.3 µs
(PAL) and trail the rising edge of the HSYNC signal by
5.3 µs (NTSC) or 5.6 µs.
They are generated for only 10 H to 256 H (NTSC) or
304 H (PAL) after the VR pulse.
These pulses have a width of 8.9 µs (NTSC) or 8.8 µs
(PAL) and follow the rising edge of the HSYNC signal.
Leave these test inputs open. (The pins include built-in
pull-up resistors.)
This pin is at "L" level when the SC1 signal leads the
SC
) clock signal; in internal synchronization mode, it
Function Description
SC
For Video Equipment
, is 14.31818 MHz for NTSC
SC
I pin on