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參數(shù)資料
型號: LC74794
元件分類: 畫面疊加
英文描述: ON-SCREEN DISPLAY IC, PDIP30
封裝: SDIP-30
文件頁數(shù): 26/30頁
文件大小: 320K
代理商: LC74794
No. 5557-5/30
LC74794, 74794M
Parameter
Symbol
Conditions
Ratings
Unit
min
typ
max
CVOUT;VDD1 = 5.0 V
1.67
V
Color burst high level
VCBH
VDD2 = 5.0 V
1.87
V
2.17
V
CVOUT;VDD1 = 5.0 V
1.23 (1.16)
V
Background color low level
VRSL
VDD2 = 5.0 V
1.43 (1.36)
V
1.73 (1.66)
V
CVOUT;VDD1 = 5.0 V
2.37 (2.01)
V
Background color high level
VRSH
VDD2 = 5.0 V
2.57 (2.21)
V
2.87 (2.51)
V
CVOUT;VDD1 = 5.0 V
1.50
V
Frame level 0
VBK0VDD2 = 5.0 V
1.70
V
2.00
V
CVOUT;VDD1 = 5.0 V
2.08
V
Frame level 1
VBK1VDD2 = 5.0 V
2.28
V
2.58
V
CVOUT;VDD1 = 5.0 V
2.65
V
Character level
VCHA
VDD2 = 5.0 V
2.85
V
3.15
V
Continued from preceding page.
Notes:
When the sync level is 0.8 V.
When the sync level is 1.0 V.
When the sync level is 1.3 V.
The values in parentheses for the background color high and low levels are the values for a blue background.
Note: Timings follow those for OSD write when the CMOS output circuit is used.
Parameter
Symbol
Conditions
Ratings
Unit
min
typ
max
Minimum input pulse width
tW(SCLK) SCLK1
200
ns
tW(CS1)
CS1 (The period when CS1 is high)
1
s
Data setup time
tSU(CS1)
CS1
200
ns
tSU(SIN)
SIN1
200
ns
Data hold time
th(CS1)
CS1
2
s
th(SIN)
SIN1
200
ns
One word write time
tword
The time to write 8 bits of data
4.2
s
twt
The RAM data write time
1
s
Timing Characteristics at Ta = –30 to +70°C, VDD1 = 5 ± 0.5 V
OSD write (See Figure 1.)
Parameter
Symbol
Conditions
Ratings
Unit
min
typ
max
tCKCY
SCLK2
2
s
Minimum input pulse width
tCKL
SCLK2
1
s
tCKH
SCLK2
1
s
Setup time
tICK
SCLK2
10
s
Output delay time
tCKO
DOUT
0.5
s
PDC/VPS reads (For the n-channel open-drain output circuit. See Figure 2.)
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