5-38
Electrical Information
Table 5-31 summarizes the timing specifications for the 1024 x 768 and 1280 x 1024 moni-
tors at 60 Hz, 75 Hz, and 72 Hz.
Table 5-31
Timing Specifications at 60 Hz, 75 Hz, and 72 Hz
Signal
D2806A
1024x768
60 Hz
D2806A
1024x768
75 Hz
A4330A/
A4331
1280x1024
60Hz
A4330A/
A4331
1280x1024
72 Hz
Horizontal
active scan
15.97
µ
s 12.105
µ
s
11.832
µ
s
9.482
µ
s
Horizontal
“back porch”
2.00
µ
s
1.513
µ
s
1.849
µ
s
1.422
µ
s
Horizontal
blanking
4.99
µ
s
3.783
µ
s
3.956
µ
s
3.318
µ
s
Horizontal
“front porch”
1.00
µ
s
0.756
µ
s
0.407
µ
s
0.474
µ
s
Horizontal
period (“1H”)
20.96
µ
s
15.888
µ
s
15.788
µ
s
12.800
µ
s
Horizontal
sweep fre-
quency
47.7KHz
62.936KHz
63.34KHz
78.125KHz
Horizontal sync
width
2.00
µ
s
1.513
µ
s
1.701
µ
s
1.422
µ
s
Pixel clock rate
64.1088MHz
84.587MHz
108.181MHz
135.000MHz
Vertical active
period
16.097ms
12.202ms
16.167ms
13.107ms
Vertical “back
porch”
419.20
µ
s
(20H)
1.016ms (64H)
410.49
µ
s
(26H)
704.00
µ
s
(55H)
Vertical blank-
ing
0.570ms
1.144ms
.505ms
0.780ms
Vertical frame
rate
60Hz
(non-in)
74.924Hz
(non-in)
60Hz
(non-in)
72.005Hz
(non-in)
Vertical “front
porch”
62.89
µ
s (3H)
63.55
µ
s (4H)
47.36
µ
s (3H)
38.400
µ
s (3H)
Vertical period
16.667ms
13.346ms
16.672ms
13.887ms
Vertical sync
width
83.86
µ
s (4H)
63.55
µ
s (4H)
47.36
µ
s (3H)
38.400
µ
s (3H)
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