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GD82559ER — Networking Silicon
76
Datasheet
10.3 AC Specifications
NOTES:
1. Switching Current High specifications are not relevant to PME#, SERR#, or INTA#, which are open drain
outputs.
2. Maximum current requirements will be met as drivers pull beyond the first step voltage (AC drive point).
Equations defining these maximums (A and B) are provided. To facilitate component testing, a maximum
current test point is defined for each side of the output driver.
Figure 25. RBIAS10 Resistance Versus Transmitter Current
Rbias10
621.5 0hm
549 Ohm
576 Ohm
Icct10
19mA
20 mA
21mA
Table 21. AC Specifications for PCI Signaling
Symbol Parameter Condition Min Max Units Notes
I
OH(AC)
Switching
Current High
0 < V
out
≤ 1.4 -44 mA 1
1.4 < V
out
< 0.9V
CC
-17.1(V
CC
- V
out
)mA1
0.7V
CC
< V
out
< V
CC
Eqn A mA 2
(Test Point) V
out
= 0.7V
CC
-32V
CC
mA 2
I
OL(AC)
Switching
Current Low
V
out
≥ 2.2 95 mA 1
2.2 > V
out
> 0.1V
CC
V
out
/0.023 mA 1
0.18V
CC
> V
out
> 0 Eqn B mA 2
(Test Point) V
out
= 0.18V
CC
38V
CC
mA 2
I
CL
Low Clamp
Current
-3 < V
in
≤ -1
-25 + (V
in
+ 1)/
0.015
mA 3
I
CH
High Clamp
Current
V
CC
+4 > V
in
≥ V
CC
+1
25 + (V
in
-V
CC
-1)/
0.015
mA 3
slew
RP
PCI Output Rise
Slew Rate
0.4 V to 2.4 V 1 4 V/ns
slew
FP
PCI Output Fall
Slew Rate
2.4 V to 0.4 V 1 4 V/ns
Equation A. I
OH
= (98/V
CC
)
*
(V
out
- V
CC
)
*
(V
out
+ 0.4V
CC
), for V
CC
> V
out
> 0.7V
CC
Equation B. I
OL
= (256/V
CC
)
*
(V
out
)
*
(V
CC
- V
out
), for 0 < V
out
< 0.18V
CC