82845PE Datasheet, PDF (150/176 Pages) Intel Corporation – 82845GE Graphics and Memory Controller Hub (GMCH) and 82845PE Memory Controller Hub (MCH)

Electrical Characteristics
6.6.3 DAC AC Characteristics
Table 6-9. DAC AC Characteristics (Intel^® 82845GE only)
Parameter
Pixel Clock Frequency
R,G,B Video Rise Time
R,G,B Video Fall Time
Settling Time
Video channel-to-channel
output skew
Overshoot/ Undershoot
Noise Injection Ratio
VCCA_DAC
• DC-to-10MHz
• 1- MHz-to-Pixel Clock
Frequency
Min
0.57
0.57
-0.084
Typical
Max Units
Notes
350
MHz
Notes 1, 2, (10–90% of black-to-
1.43
ns white transition, at 350 MHz pixel
clock)
Notes 1, 3, (90–10% of white-to-
1.43
ns black transition, at 350 MHz pixel
clock)
0.86
ns Notes 1, 4, at 350 MHz pixel clock
0.714
ns Notes 1, 5, at 350 MHz pixel clock
+0.084
0.5
V
Notes 1, 6, Full-scale voltage step
of 0.7 V
% Notes 1, 7
1.4955
1.48575
1.5
1.5
1.5045
1.51425
V
V
Note 8, DAC Supply Voltage
NOTES:
1. Measured at each R,G,B termination according to the VESA Test Procedure – Evaluation of Analog Display
Graphics Subsystems Proposal (Version 1, Draft 4, December 1, 2000)
2. R,G,B Max Video Rise/Fall Time: 50% of minimum pixel clock period
3. R,G,B Min Video Rise/Fall Time: 20% of minimum pixel clock period
4. Max settling time: 30% of minimum pixel clock period
5. Video channel-channel output skew: 25% of minimum pixel clock period
6. Overshoot/undershoot: ± 12% of black-white video level (full-scale) step function
7. Noise injection ratio: 0.5% of maximum luminance voltage (dc to max. pixel frequency)
8. Any deviation from this specification should be validated. See your Intel Field Representative for more
information.
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Intel^® 82845GE/82845PE Datasheet