82551IT Datasheet, PDF (86/102 Pages) Intel Corporation – Fast Ethernet PCI Controller

82551IT — Networking Silicon
11.3
AC Specifications
Table 54. AC Specifications for PCI Signaling
Symbol Parameter
Condition
I_OH(AC)
I_OL(AC)
I_CL
I_CH
slew_RP
slew_FP
Switching
Current High
(Test Point)
Switching
Current Low
(Test Point)
Low Clamp
Current
0 < V_OUT  1.4
1.4 < V_OUT < 0.9V_CC
0.7V_CC < V_OUT < V_CC
V_OUT = 0.7V_CC
V_OUT  2.2
2.2 > V_OUT > 0.1V_CC
0.18V_CC > V_OUT > 0
V_OUT = 0.18V_CC
-3 < V_IN  -1
High Clamp
Current
V_CC + 4 > V_IN  V_CC + 1
PCI Output Rise
Slew Rate
0.4 V to 2.4 V
PCI Output Fall
Slew Rate
2.4 V to 0.4 V
Min
Max Units Notes
-44
mA
1
-17.1(V_CC - V_OUT)
mA
1
Eqn A mA
2
-32V_CC mA
2
95
mA
1
V_OUT/0.023
mA
1
Eqn B mA
2
38V_CC mA
2
-25 + (V_IN + 1)/0.015
mA
3
25 + (V_IN - V_CC -1)/
0.015
mA
1
4
V/ns
1
4
V/ns
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.
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
3. Do not test. Guaranteed by design.
80
Datasheet