EP3C16F256I7N Altera, EP3C16F256I7N Datasheet - Page 418

• Manufacturer Part Number: EP3C16F256I7N
• Description: Cyclone III
• Manufacturer: Altera

Electrical Characteristics
1–8
Cyclone III Handbook
Equation 1–1. (1), (2), (3), (4), (5), (6), (7), (8), (9), (10), (11),
ΔR
ΔR
For ΔR
For ΔR
MF = MF
R
Notes to
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10) R
(11) R
(12) Subscript x refers to both
For example, to calculate the change of 50 Ω I/O impedance from 25° C at
3.0 V to 85° C at 3.15 V,
Since ΔR
Since ΔR
final
V
T
= (T
= (V
ΔR
ΔR
dR/dT is the percentage change of resistance with temperature.
dR/dmV is the percentage change of resistance with voltage.
V
V
T
T
MF is multiplication factor.
ΔR
ΔR
MF
MF
MF = 0.963 x 1.157 = 1.114
R
= R
2
1
final
initial
2
1
final
is the initial temperature.
x
x
V
T
is the initial voltage.
is the final temperature.
is final voltage.
V
T
V
T
is variation of resistance with temperature.
< 0; MF
> 0; MF
Equation
is variation of resistance with voltage.
2
initial
V
T
2
is final resistance.
= (85 - 25) x 0.262 = 15.72
= (3.15 - 3) x 1000 x -0.026 = -3.83
V
= 15.72/100 + 1 = 1.157
is initial resistance.
= 1 / ( 3.83/100 + 1) = 0.963
- T
= 50 x 1.114 = 55.71 Ω
is positive,
is negative,
- V
x MF
1
1
) x dR/dT ----- (2)
x MF ----- (6)
) x 1000 x dR/dmV ----- (1)
x
x
T
1–1:
= 1/ (|ΔR
= ΔR
----- (5)
x
/100 + 1 ----- (4)
V
and
x
|/100 + 1) ----- (3)
T.
Altera Corporation- Preliminary
(12)
March 2007