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參數資料
| 型號： | LC74723 |
| 元件分類： | 畫面疊加 |
| 英文描述： | ON-SCREEN DISPLAY IC, PDIP24 |
| 封裝： | 0.300 INCH, PLASTIC, SDIP-24 |
| 文件頁數： | 6/12頁 |
| 文件大小： | 245K |
| 代理商： | LC74723 |
Continued from preceding page.
Note: * Both the VDD1 pins (pins 16 and 24) must be connected.
Specifications
Absolute Maximum Ratings at Ta = 25°C
Allowable Operating Ranges at Ta = –30 to +70°C
Note: When the XtalIN pin is used in clock input mode, be extremely careful of input noise.
Electrical Characteristics at Ta = –30 to +70°C, VDD1 = 5 V unless otherwise specified
No. 4841-3/12
LC74723, 74723M
Pin No.
Symbol
Function
Description
21
CTRL2
NTSC/PAL-M switch input
Switches the synchronization signal generation between NTSC and PAL-M.
Low = NTSC, high = PAL-M
22
CTRL3
SEPIN input control
Controls whether the VSYNC signal is input to SEPIN.
Low = Input VSYNC, high = do not input.
23
RST
Reset input
System reset input
There is a built-in pull-up resistor on this input (hysteresis input).
24
VDD1
Power supply (+5 V)
Power supply (+5 V: digital system power supply)
Parameter
Symbol
Conditions
Ratings
Unit
Maximum supply voltage
VDD max
VDD1, VDD2VSS – 0.3 to VSS + 7.0
V
Maximum input voltage
VIN max
All input pins
VSS – 0.3 to VDD + 0.3
V
Maximum output voltage
VOUT max CSYNOUT, SYNCJDG, SEPOUT
VSS – 0.3 to VDD + 0.3
V
Allowable power dissipation
Pd max
Ta = 25°C
350
mW
Operating temperature
Topr
–30 to +70
°C
Storage temperature
Tstg
–40 to +125
°C
Parameter
Symbol
Conditions
min
typ
max
Unit
Supply voltage
VDD1VDD1
4.5
5.0
5.5
V
VDD2VDD2
4.5
5.0
1.27 VDD1V
Input high level voltage
VIH1
RST, CS, SIN, SCLK
0.8 VDD1VDD1 + 0.3
V
VIH2
CTRL1, CTRL2, CTRL3, SEPIN
0.7 VDD1VDD1 + 0.3
V
Input low level voltage
VIL1
RST, CS, SIN, SCLK
VSS – 0.3
0.2 VDD1V
VIL2
CTRL1, CTRL2, CTRL3, SEPIN
VSS – 0.3
0.3 VDD1V
Pull-up resistance
RPU
Applies to the RST, CS, SIN, and SCLK pins and to
25
50
90
k
the pins specified by options.
Composite video input voltage
VIN1CVIN; VDD1 = 5 V
2.0
Vp-p
VIN2
SYNIN; VDD1 = 5 V
2.0
2.5
Vp-p
Input voltage
VIN3
XtalIN (when external clock input is used)
0.1
5.0
Vp-p
fin = 2fsc or 4fsc; VDD1 = 5 V
fosc1
XtalIN and XtalOUT oscillator pins (2fsc: NTSC)
7.159
MHz
fosc1
XtalIN and XtalOUT oscillator pins (4fsc: NTSC)
14.318
MHz
Oscillator frequency
fosc1
XtalIN and XtalOUT oscillator pins (2fsc: PAL-M)
7.151
MHz
fosc1
XtalIN and XtalOUT oscillator pins (4fsc: PAL-M)
14.302
MHz
fosc2
OSCIN and OSCOUT oscillator pins (LC oscillator)
5
12
MHz
Parameter
Symbol
Conditions
min
typ
max
Unit
Input off leakage current
Ileak1CVIN
1A
Output off leakage current
Ileak2CVOUT
1A
Output high level voltage
VOH1
CSYNOUT, SYNCJDG, SEPOUT;
3.5
V
VDD1 = 4.5 V, IOH = –1.0 mA
Output low level voltage
VOL1
CSYNOUT, SYNCJDG, SEPOUT;
1.0
V
VDD1 = 4.5 V, IOL = 1.0 mA
IIH
RST, CS, SIN, SCLK, CTRL1, CTRL2, CTRL3, SEPIN;
1A
Input current
VIN = VDD1
IIL
CTRL1, CTRL2, CTRL3, OSCIN; VIN = VSS1–1
A
Current drain (operating)
IDD1VDD1; All outputs open, Xtal: 7.159 MHz, LC: 8 MHz
15
mA
IDD2VDD2; VDD2 = 5 V
20
mA
Continued on next page.
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