PM7311 pmc-sierra, PM7311 Datasheet - Page 280

• Manufacturer Part Number: PM7311
• Description: Freedm 84a1024l Assp Telecom Standard Datasheet
• Manufacturer: pmc-sierra

Proprietary and Confidential to PMC-Sierra, Inc., and for its customers’ internal use.
Document No.: PMC-2021832, Issue 2
17
17.1 Power Requirements
17.2 Power Sequencing
Power Information
Table 54 Power Requirements
Conditions
Full OC-3 Operation
Notes:
1.
2.
3.
4.
Due to ESD protection structures in the pads it is necessary to exercise caution when powering a
device up or down. ESD protection devices behave as diodes between power supply pins and
from I/O pins to power supply pins. Under extreme conditions, incorrect power sequencing may
damage these ESD protection devices or trigger latch up.
The recommended power supply sequencing is as follows:
1. VDD
2. I/Os get driven after all the supplies have been powered. Otherwise, the I/Os must be current
3. Power down the device in the reverse sequence.
Typical IDD values are calculated as the mean value of current under the following conditions: typically
processed silicon, nominal supply voltage, T
specified), and a normal amount of traffic or signal activity. These values are suitable for evaluating
typical device performance in a system
Max IDD values are currents guaranteed by the production test program and/or characterization over
process for operating currents at the maximum operating voltage and operating temperature that yields
the highest current (including outputs loaded to 30 pF, unless otherwise specified)
Typical power values are calculated using the formula:
Where i denotes all the various power supplies on the device, VDDNomi is the nominal voltage for
supply i, and IDDTypi is the typical current for supply i (as defined in note 1 above). These values are
suitable for evaluating typical device performance in a system
High power values are a “normal high power” estimate and are calculated using the formula:
Where i denotes all the various power supplies on the device, VDDMaxi is the maximum operating
voltage for supply i, and IDDHighi is the current for supply i. IDDHigh values are calculated as the
mean value plus two sigmas (2σ) of measured current under the following conditions: T
outputs loaded with 30 pF (if not otherwise specified). These values are suitable for evaluating board
and device thermal characteristics
limited to 20 mA.
Power = ∑i(VDDNomi x IDDTypi)
Power = ∑i(VDDMaxi x IDDHighi)
3.3
power must be supplied either before VDD
FREEDM 84A1024L ASSP Telecom Standard Product Data Sheet
Parameter
IDDOP (1.8V)
IDDOP (3.3 V)
Total Power
J
=60 °C, outputs loaded with 30 pF (if not otherwise
1.8
Typ
0.78
0.07
1.64
or simultaneously with VDD
1,3
High
0.85
0.08
1.94
4
Max
—
—
—
2
J
=105° C,
Units
A
A
W
1.8
Released
.
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