Altera Cyclone IV - Page 455

Chapter 1: Cyclone IV Device Datasheet 1–9
Operating Conditions
December 2016 Altera Corporation Cyclone IV Device Handbook,
Volume 3
The OCT resistance may vary with the variation of temperature and voltage after
calibration at device power-up. Use Table 1–10 and Equation 1–1 to determine the
final OCT resistance considering the variations after calibration at device power-up.
Table 1–10 lists the change percentage of the OCT resistance with voltage and
temperature.
Table 1–10. OCT Variation After Calibration at Device Power-Up for Cyclone IV Devices
(1)
Nominal Voltage dR/dT (%/°C) dR/dV (%/mV)
3.0 0.262 –0.026
2.5 0.234 –0.039
1.8 0.219 –0.086
1.5 0.199 –0.136
1.2 0.161 –0.288
Note to Table 1–10:
(1) This specification is not applicable to EP4CGX15, EP4CGX22, and EP4CGX30 devices.
Equation 1–1. Final OCT Resistance
(1), (2), (3), (4), (5), (6)
R
V
= (V
2
– V
1
) × 1000 × dR/dV –––––
(7)
R
T
= (T
2
– T
1
) × dR/dT –––––
(8)
For R
x
< 0; MF
x
= 1/ (|R
x
|/100 + 1) –––––
(9)
For R
x
> 0; MF
x
= R
x
/100 + 1 –––––
(10)
MF = MF
V
× MF
T
–––––
(11)
R
final
= R
initial
× MF –––––
(12)
Notes to Equation 1–1:
(1) T
2
is the final temperature.
(2) T
1
is the initial temperature.
(3) MF is multiplication factor.
(4) R
final
is final resistance.
(5) R
initial
is initial resistance.
(6) Subscript
x
refers to both
V
and
T
.
(7) R
V
is a variation of resistance with voltage.
(8) R
T
is a variation of resistance with temperature.
(9) dR/dT is the change percentage of resistance with temperature after calibration at device power
-up.
(10) dR/dV is the change percentage of resistance with voltage after calibration at device power
-up.
(11) V
2
is final voltage.
(12) V
1
is the initial voltage.