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Video Signals
Video Signal Characteristics
Video signal inputs on J3 are digital inputs and are compatible with CMOS logic.
Table 8. Video Signal DC Characteristics.
Description
Absolute Maximum Input Voltage
Low-level Input Voltage
High-level Input Voltage
Low-level Input Current
High-level Input Current
1. I
applies to all signals except R/L and U/D. I
IL1
2. I
applies to all signals except ENAB, U/D, and R/L. I
IH1
and R/L.
Video Modes
The video interface automatically recognizes 480-, 400-, and 350-line formats. Mode
recognition depends on the polarity of the sync signals as shown in Table 9.
Table 9. Video Modes.
Mode
Hsync (J3-3)
Vsync (J3-4)
In 400-line and 350-line modes, the screen image will be automatically centered as
shown in Figure 4 below.
Figure 4. Image centering.
data invalid period
data invalid period
400 lines mode (TV=449)
10
LC640.480.33-AC Operations Manual (OM600-01)
1
2
480 line
negative
negative
40 lines
data period
400 lines
40 lines
Symbol
Minimum
V
-0.3
max
I
V
0
IL
V
0.7V
IH
L
I
–
IL1
I
–
IL2
I
–
IH1
I
–
IH2
applies to signals R/L and U/D.
IL2
applies to signals ENAB, U/D,
IH2
400 line
negative
positive
data invalid period
data period
data invalid period
350 lines mode (TV=449)
Maximum
Units
V
+ 0.3
Vdc
L
0.3V
Vdc
L
V
Vdc
L
1
µA
60
µA
1
µA
60
µA
350 line
positive
negative
65 lines
350 lines
65 lines
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