EP2C8 datasheet(103/168 Pages) ALTERA

103 / 168 page

Altera Corporation

5–13

February 2008

Cyclone II Device Handbook, Volume 1

DC Characteristics and Timing Specifications

Table 5–13 shows the Cyclone II device pin capacitance for different I/O

pin types.

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.

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.

Table 5–13. Device Capacitance Note (1)

Symbol

Parameter

Typical

Unit

CIO

Input capacitance for user I/O pin.

CLVDS

Input capacitance for dual-purpose

LVDS/user I/O pin.

CVREF

Input capacitance for dual-purpose

VREF

pin when used as

VREF or user I/O pin.

CCLK

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.

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