82563EB Datasheet, PDF (26/52 Pages) Intel Corporation – Intel® 82563EB/82564EB Gigabit Ethernet Controllers

82563EB/82564EB Gigabit Platform LAN Connect Networking Silicon
Table 20. 1.2V External Power Supply Parameters
Title
Description
Min
Max
Units
Rise Time
Time from 10% to 90% mark
1.5
Monotonicity
Voltage dip allowed in ramp
-
Slope
Ramp rate at any given time between
10% and 90%
Min: 0.8*V(min)/Rise time (max)
-
Max: 0.8*V(max)/Rise time (min)
Operational Range
Voltage range for normal operating
conditions
1.08
Ripple
Maximum voltage ripple (peak to
peak)^a
-
Overshoot
Maximum overshoot allowed
-
Maximum overshoot allowed
duration.
Overshoot Duration _{(At that time delta voltage should be}
-
lower than 5 mV from steady state
voltage)
Decoupling
Capacitance
Capacitance range
5
Capacitance ESR
Equivalent series resistance of output
capacitance
-
200
120
1500
1.32
100
240
1
-
100
ms
mV
mV/ms
V
mV
mV
ms
µF
MΩ
a. The peak to peak output ripple is measured at 20 MHz Bandwidth within the operational range. The ripple must be included
within the operational range.
4.4.2
Power Sequencing with External Regulators
The following power-on/off sequence should be applied when external power supplies are in use.
Designs must comply with the required power sequence to avoid risk of either latch-up or forward
biased internal diodes.
The general rule of thumb is that the 82563EB/82564EB power sequencing should power up the
three power rails in the following order: 3.3V Æ 1.9V Æ 1.2V. However, if this general guideline
is not followed, there are specific requirements that must be adhered that are listed in the following
two sections.
4.4.2.1
External LVR Power up Sequencing and Tracking
Sequencing of the external supplies during power up may be necessary to ensure that the device is
not electrically overstressed and does not latch-up. These requirements are shown in Figure 3.
• The 82563EB/82564EB core voltage (1.2V) cannot exceed the 3.3V supply by more than 0.5V
at any time during the power up. The 82563EB/82564EB core voltage (1.2V) can not exceed
the 1.9V supply by more than 0.5V at any time during the power up. The core voltage is not
required to begin ramping before the 3.3V or the 1.9V supply.
• The 82563EB/82564EB analog voltage (1.9V) cannot exceed the 3.3V supply by more than
0.5V at any time during the power up. The analog voltage is not required to begin ramping
before the 3.3V supply.
20