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
C
I O
C
L V D S
C
V R E F
C
C L K
(1)
Parameter
Input capacitance for user I/O pin.
Input capacitance for dual-purpose
LVDS/user I/O pin.
Input capacitance for dual-purpose
pin when used as
VREF
or user I/O pin.
Input capacitance for clock pin.
Typical
6
6
21
5
Unit
pF
pF
pF
pF
Note to
Table 5–13:
Capacitance is sample-tested only. Capacitance is measured using time-domain
reflectometry (TDR). Measurement accuracy is within ±0.5 pF.
Power
Consumption
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.
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 I
CC
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 I
CCINT
power-up requirement depends on the
V
CCINT
voltage supply rise time.
Altera Corporation
February 2008
5–13
Cyclone II Device Handbook, Volume 1
ALTERA [ ALTERA CORPORATION ]
