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EP3C120F484C7N Datasheet(PDF) 8 Page - Altera Corporation

Part # EP3C120F484C7N
Description  1. Cyclone III Device Datasheet
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Manufacturer  ALTERA [Altera Corporation]
Direct Link  http://www.altera.com
Logo ALTERA - Altera Corporation

EP3C120F484C7N Datasheet(HTML) 8 Page - Altera Corporation

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Chapter 1: Cyclone III Device Datasheet
Electrical Characteristics
Cyclone III Device Handbook
July 2012
Altera Corporation
Volume 2
Example 1–1 shows you the example to calculate the change of 50 I/O impedance
from 25°C at 3.0 V to 85°C at 3.15 V:
Pin Capacitance
Table 1–9 lists the pin capacitance for Cyclone III devices.
Example 1–1.
R
V = (3.15 – 3) × 1000 × –0.026 = –3.83
R
T = (85 – 25) × 0.262 = 15.72
Because
R
V is negative,
MFV = 1 / (3.83/100 + 1) = 0.963
Because
R
T is positive,
MFT = 15.72/100 + 1 = 1.157
MF = 0.963 × 1.157 = 1.114
Rfinal = 50 × 1.114 = 55.71 
Table 1–9. Cyclone III Devices Pin Capacitance
Symbol
Parameter
Typical –
QFP
Typical –
FBGA
Unit
CIOTB
Input capacitance on top/bottom I/O pins
7
6
pF
CIOLR
Input capacitance on left/right I/O pins
7
5
pF
CLVDSLR
Input capacitance on left/right I/O pins with dedicated
LVDS output
87
pF
CVREFLR
(1)
Input capacitance on left/right dual-purpose VREF pin
when used as VREF or user I/O pin
21
21
pF
CVREFTB
(1)
Input capacitance on top/bottom dual-purpose VREF pin
when used as VREF or user I/O pin
23 (2)
23 (2)
pF
CCLKTB
Input capacitance on top/bottom dedicated clock input
pins
76
pF
CCLKLR
Input capacitance on left/right dedicated clock input pins
6
5
pF
Notes to Table 1–9:
(1) When VREF pin is used as regular input or output, a reduced performance of toggle rate and tCO is expected due to
higher pin capacitance.
(2) CVREFTB for EP3C25 is 30 pF.


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