MN676011NPS Datasheet, PDF (3/8 Pages) Panasonic Semiconductor – NTSC Color Camera Synchronizing Signal Generator LSI

For Video Equipment
MN676011NPS
Pin Descriptions (continued)
Pin No.
4
Symbol
4f_SCOSCI
Pin Name
Crystal oscillator
input
5
4f_SCOSCO Crystal oscillator
output
3
EX4f_SCI External clock input
14
EX910f_HI External clock input
10 EXT/INT External/internal
synchronization switch
input
13
VR Vertical reset input
12
TEST Test input
9
VPCO Phase comparator
output
18
SW1
Function Description
Connect these pins to a 14.31818-MHz crystal oscillator
through capacitors appropriate for V_SS1 .
"L" level input to the EXT/INT pin (which includes a built-
in feedback resistor) produces oscillation; "H" level input
stops it.
Color subcarrier frequency (4f_SC) input
"H" level input to the EXT/INT pin enables external clock
input. If this pin is not used, keep it at "L" level.
External 910f_H (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.
This pin switches the chip between external and internal
synchronization modes.
"H" level input produces external synchronization;
"L" level, internal synchronization.
Incorporating pull-down resistor.
Falling edge input resets the leading edge of the vertical
synchronizing signal (VP).
The pin includes a built-in pull-up resistor.
Test input Keep this pin at "H" level.
The pin includes a built-in pull-up resistor.
This pin gives the results of comparing the phases of the
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.
These pins control the widths of H-BLK and V-BLK pulses.
H-BLK pulse width
17
SW2 ^selection
16
SW3
V-BLK pulse width
15
SW4 ^selection
SW1
L
H
L
H
SW3
L
H
L
H
SW2
L
L
H
H
SW4
L
L
H
H
H-BLK (µs)
10.69
10.82
10.97
11.10
V-BLK (H)
19
20
21
21