82573 Datasheet, PDF (18/39 Pages) Intel Corporation – GbE Controllers

82573—Datasheet
3.3.1
Table 3.
Table 4.
External LVR Power Delivery
The following power supply requirements apply to designs where the 82573 is supplied
by external voltage regulators. These systems do not use the internal regulator logic
built into the 82573 as described in Section 3.3.3.
3.3V External Supply Voltage Ramp and Sequencing Recommendations
Parameter
Description
Rise Time
Monotonicity
Slope
Operational Range
Ripple
Overshoot
Capacitance
Rise time from 10% to 90%
Voltage dip allowed in ramp
Ramp rate at any time between 10% to 90%
Minimum = (0.8 * Vmin) / (Maximum Rise Time)
Maximum = (0.8 * Vmax) / (Minimum Rise Time)
Voltage range for normal operating conditions
Maximum voltage ripple at a bandwidth of 50 MHz
Maximum voltage allowed²
Minimum capacitance
Min
5
3
25
Max
100¹
300
Unit
ms
mV
1500
mV/ms
3.6
100
660
V
mV_pk-pk
mV
µF
1. Good design practices achieve voltage ramps to within the regulation bands in approximately 20 ms or less.
2. Excessive overshoot can affect long term reliability.
2.5V External Supply Voltage Ramp and Sequencing Recommendations
Parameter
Description
Rise Time
Monotonicity
Slope
Operational Range
Operational Range
Ripple
Undershoot
Overshoot
Output
Capacitance
Input Capacitance
Capacitance ESR
I_CTRL
Rise time from 10% to 90%
Voltage dip allowed in ramp
Ramp rate at any time between 10% to 90%
Minimum = (0.8 * Vmin) / (Maximum Rise Time)
Maximum = (0.8 * Vmax) / (Minimum Rise Time)
Voltage range for normal operating conditions
Voltage range for normal operating conditions
Maximum voltage ripple at a bandwidth of 50 MHz
Maximum voltage allowed will not exceed 10% of
nominal supply
Maximum voltage allowed²
Capacitance range when using a PNP circuit
Capacitance range when using a PNP circuit
Equivalent series resistance of output capacitance³
Maximum output current rating with respect to
CTRL_25
Min
2.5
Max
100¹
200
Unit
ms
mV
1500
mV/ms
2.375
-5
2.625
+5
60
V
%
mV_pk-pk
480
mV
4.7
25
µF
4.7
µF
10
mΩ
20
mA
1. Good design practices achieve voltage ramps to within the regulation bands in approximately 20 ms or less.
2. Excessive overshoot can affect long term reliability.
3. Tantalum capacitors must not be used.
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