Specifications

For details about the minimum current requirements, refer to the PowerPlay Early Power Estimator (EPE),
and compare to the information listed in Table 10-1. If the current transient exceeds the minimum current
requirements in the PowerPlay EPE, you need to take the information into consideration for your power
regulator design.
Related Information
PowerPlay Early Power Estimators (EPE) and Power Analyzer
Provides more information about the PowerPlay EPE support for Cyclone V devices.
Power-On Reset Circuitry
The POR circuitry keeps the Cyclone V device in the reset state until the power supply outputs are within
the recommended operating range.
A POR event occurs when you power up the Cyclone V device until the power supplies reach the
recommended operating range within the maximum power supply ramp time, t
RAMP
. If t
RAMP
is not met,
the Cyclone V device I/O pins and programming registers remain tri-stated, during which device configuration
could fail.
Figure 10-4: Relationship Between t
RAMP
and POR Delay
Time
POR trip level
Volts
POR delay
configuration
time
t
RAMP
first power
supply
last power
supply
The Cyclone V POR circuitry uses an individual detecting circuitry to monitor each of the
configuration-related power supplies independently. The main POR circuitry is gated by the outputs of all
the individual detectors. The main POR signal is asserted when the power starts to ramp up. This signal is
released after the last ramp-up power reaches the POR trip level during power up.
In user mode, the main POR signal is asserted when any of the monitored power goes below its POR trip
level. Asserting the POR signal forces the device into the reset state.
Altera Corporation
Power Management in Cyclone V Devices
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10-5
Power-On Reset Circuitry
CV-52010
2013.06.28