LC74798M 查看數據表（PDF） - SANYO -> Panasonic
零件编号
产品描述 (功能)
生产厂家
LC74798M Datasheet PDF : 32 Pages
| |||
LC74798, 74798M
Pin Descriptions
Pin No.
1
2
3
Pin name
VSS1
XtalIN
XtalOUT
(MUTE)
Ground
Function
Crystal oscillator
(MUTE input)
Notes
Ground connection (digital system ground)
These pins are used either to connect the crystal and capacitors used to form an external
crystal oscillator circuit to generate the internal synchronizing signals, or to input an
external clock signal (2fsc or 4fsc). As a mask option, the XtalOUT pin can be set to
function as the MUTE input pin. When this pin is set low, the video output is held at the
pedestal level. (A pull-up resistor is built in and the input has hysteresis characteristics.)
CTRL1 Crystal oscillator input switching
4
(CHABLK) (CHABLK output)
5
CS2
Enable input 2
Switches the mode between external clock input and crystal oscillator operation. A low
level selects crystal oscillator operation and a high level selects external clock input. As a
mask option, the CTRL1 input pin can be set to function as the CHABLK (character ·
frame) output. This is a 3-value output.
Enable input for the PDC/VPS data output. Data output is enabled when this input is low.
A pull-up resistor is built in and the input has hysteresis characteristics.
6
SCLK2 Clock input 2
Clock input for the PDC/VPS data output.
A pull-up resistor is built in and the input has hysteresis characteristics.
7
DOUT Data output
PDC/VPS data output.
(This can be either an n-channel open-drain output or a CMOS output.)
Outputs the state of the external synchronizing signal presence/absence judgment.
8
SYNCJDG
External synchronizing signal judgment Outputs a high level when synchronizing signals are present.
output
Outputs the crystal oscillator clock when CS1 and RST are low.
(This signal is not output on command resets.)
9
CS1
Enable input 1
Enable input for the OSD serial data input.
Serial data input is enabled when this pin is low.
A pull-up resistor is built in and the input has hysteresis characteristics.
10
SCLK1 Clock input 1
Serial data input enable pin.
A pull-up resistor is built in and the input has hysteresis characteristics.
11
SIN1 Data input 1
Serial data input. A pull-up resistor is built in and the input has hysteresis characteristics.
12
VDD2
Power supply
13
CPOUT Charge pump output
Composite video signal level adjustment power supply (analog system power supply)
Charge pump output. Connect a low-pass filter to this pin.
14
VCOIN Oscillator control voltage input
VCO oscillator control voltage input. (For data slicing)
15
VSS3
Ground
16
VCOR Oscillator range adjustment
17
VCOIN2 Oscillator control voltage input 2
18
VDD3
Power supply (+5 V)
19
CVOUT Video signal output
20
VSS2
Ground
21
CVIN
Video signal input
22
CVCR Video signal input
23
VDD1
Power supply (+5 V)
24
SYNIN Sync separator circuit input
Ground (VCO ground)
VCO oscillator range adjustment resistor connection
VCO oscillator control voltage input. For character display.
Power supply (+5 V: VCO power supply)
Composite video signal output
Ground (analog system ground)
Composite video signal input
SECAM chrominance signal input
Power supply (+5 V: digital system power supply)
Video signal input to the internal sync separator circuit
25
SEPC Sync separator circuit adjustment
Internal sync separator circuit adjustment
Internal sync separator circuit composite synchronizing signal output. Can be switched to
26
SEPOUT Composite synchronizing signal output function as a signal (high, low, or ST. pulse) output by the MOD0 setting when SEL0 is
high.
Inputs the vertical synchronizing signal created by integrating the SEPOUT pin output
27
SEPIN Vertical synchronizing signal input
signal.
An integration circuit must be connected between this pin and the SEPOUT pin. This pin
must be tied to VDD1 if unused. This pin is valid when CTL3 is set high.
28
CDLR Background color phase adjustment Background color phase adjustment resistor connection
29
RST
Reset input
System reset input.
A pull-up resistor is built in and the input has hysteresis characteristics.
30
VDD1
Power supply (+5 V)
Power supply (+5 V: digital system power supply)
Note *: A capacitor of at least 2000 pF must be connected between the VDD1 power supply and VSS1.
No. 5833-3/32
Share Link: 