DC Characteristics and Timing Specifications
Table 5–13 shows the Cyclone II device pin capacitance for different I/O
pin types.
Table 5–13. Device Capacitance Note (1)
Symbol
Parameter
Typical
Unit
pF
CIO
Input capacitance for user I/O pin.
6
6
CLVDS
CVREF
CCLK
Input capacitance for dual-purpose
LVDS/user I/O pin.
pF
21
5
pF
pF
Input capacitance for dual-purpose VREF
pin when used as VREFor user I/O pin.
Input capacitance for clock pin.
Note to Table 5–13:
(1) Capacitance is sample-tested only. Capacitance is measured using time-domain
reflectometry (TDR). Measurement accuracy is within 0.5 pF.
You can calculate the power usage for your design using the PowerPlay
Early Power Estimator and the PowerPlay Power Analyzer feature in the
Quartus® II software.
Power
Consumption
The interactive PowerPlay Early Power Estimator is typically used
during the early stages of FPGA design, prior to finalizing the project, to
get a magnitude estimate of the device power. The Quartus II software
PowerPlay Power Analyzer feature is typically used during the later
stages of FPGA design. The PowerPlay Power Analyzer also allows you
to apply test vectors against your design for more accurate power
consumption modeling.
In both cases, only use these calculations as an estimation of power, not
as a specification. For more information on PowerPlay tools, refer to the
PowerPlay Early Power Estimator User Guide and the Power Estimation and
Analysis section in volume 3 of the Quartus II Handbook.
1
You can obtain the Excel-based PowerPlay Early Power
Estimator at www.altera.com. Refer to Table 5–3 on page 5–3 for
typical ICC standby specifications.
The power-up current required by Cyclone II devices does not exceed the
maximum static current. The rate at which the current increases is a
function of the system power supply. The exact amount of current
consumed varies according to the process, temperature, and power ramp
rate. The duration of the ICCINT power-up requirement depends on the
VCCINT voltage supply rise time.
Altera Corporation
February 2008
5–13
Cyclone II Device Handbook, Volume 1
ALTERA [ ALTERA CORPORATION ]
