LC74723M View Datasheet(PDF) - SANYO -> Panasonic
Part Name
Description
MFG CO.
LC74723M Datasheet PDF : 12 Pages
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Pin Assignment
LC74723, 74723M
Pin Functions
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Symbol
VSS1
XtalIN
XtalOUT
CTRL1
CSYNOUT
OSCIN
OSCOUT
SYNCJDG
CS
SCLK
SIN
VDD2
CVOUT
NC
CVIN
VDD1
SYNIN
SEPC
SEPOUT
SEPIN
Ground
Function
Ground (digital system ground)
Description
Crystal oscillator connection
Crystal oscillator input switching
Composite synchronization
signal output
Used either for connecting the external crystal and capacitor that are used for internal
synchronization signal generation, or to input an external clock signal (2fsc or 4fsc).
Switches the LC74723 between external clock input mode and crystal oscillator mode.
Low = crystal oscillator mode, high = external clock mode
Outputs a composite synchronization signal. Outputs the crystal oscillator clock on
reset, i.e., when RST is low.
LC oscillator
Connections for the coil and capacitor that form the oscillator used to generate the
character output dot clock.
External synchronization signal
judgment output
Outputs the result of judging whether or not there is an external synchronization
signal. Outputs a high level when an external synchronization signal is present.
Outputs the dot clock (LC oscillator) on reset, i.e., when RST is low. (The LC74723
can be set not to output this signal on reset using control data.)
Enable input
Enables serial data input. Serial data input is enabled when this input is low. There is
a built-in pull-up resistor on this input (hysteresis input).
Clock input
Inputs the clock signal used for serial data input.
There is a built-in pull-up resistor on this input (hysteresis input).
Data input
Serial data input. There is a built-in pull-up resistor on this input (hysteresis input).
Power supply
Power supply (analog system power supply) for composite video signal level
adjustment.
Video signal output
Composite video signal output
Must be either connected to ground or left open.
Video signal input
Composite video signal input
Power supply
Power supply (+5 V: digital system power supply)
Sync separator circuit input
Video signal input for the built-in sync separator circuit (When the built-in sync
separator circuit is not used, input either the horizontal synchronization signal or the
composite synchronization signal.)
Sync separator circuit bias voltage Built-in sync separator circuit bias voltage monitor
Composite synchronization
Outputs the built-in sync separator circuit's composite synchronization signal.
signal output
(Outputs the SYNIN input signal when the built-in sync separator circuit is not used.)
Inputs the vertical synchronization signal by integrating the output signal from the
Vertical synchronization signal input
SEPOUT pin.
An integration circuit must be connected between the SEPOUT pin and this pin. Hold
at VDD1 if this input is unused.
Continued on next page.
No. 4841-2/12
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