Technical data

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
15.97µs 12.105µs11.832µs9.482µs
Horizontal
“back porch”
2.00µs1.513µs 1.849µs1.422µs
Horizontal
blanking
4.99µs3.783µs 3.956µs3.318µs
Horizontal
“front porch”
1.00µs0.756µs 0.407µs0.474µs
Horizontal
period (“1H”)
20.96µs15.888µs15.788µs12.800µs
Horizontal
sweep fre-
quency
47.7KHz 62.936KHz 63.34KHz 78.125KHz
Horizontal sync
width
2.00µs1.513µs 1.701µs1.422µs
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”
419.20µs
(20H)
1.016ms (64H) 410.49 µs
(26H)
704.00µs
(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”
62.89µs (3H) 63.55µs (4H) 47.36µs (3H) 38.400µs (3H)
Vertical period 16.667ms 13.346ms 16.672ms 13.887ms
Vertical sync
width
83.86µs (4H) 63.55µs (4H) 47.36µs (3H) 38.400µs (3H)