
Virtex-4 FPGA Data Sheet: DC and Switching Characteristics
DS302 (v3.7) September 9, 2009 www.xilinx.com
Product Specification 7
Power-On Power Supply Requirements
Xilinx® FPGAs require a certain amount of supply current
during power-on to insure proper device initialization. The
actual current consumed depends on the power-on ramp
rate of the power supply.
The power supplies can be turned on in any sequence,
though the specifications shown in Tabl e 5 are for the rec-
ommended power-on sequence of V
CCINT
, V
CCAUX
, V
CCO
.
Xilinx does not specify the current for other power-on
sequences.
Table 5 shows the minimum current required by Virtex-4
devices for proper power-on and configuration.
If the current minimums shown in Tabl e 5 are met, the
device powers on properly after all three supplies have
passed through their power-on reset threshold voltages.
Once initialized and configured, use the XPower tool to esti-
mate current drain on these supplies.
Tabl e 5: Power-On Current for Virtex-4 Devices
Device
I
CCINTMIN
I
CCAUXMIN
I
CCOMIN
UnitsTyp
(1)
Max
(2)
Typ
(1)
Max
(2)
Typ
(1)
Max
(2)
XC4VLX15 110 750 60 100 50 75 mA
XC4VLX25 160 1350 85 125 75 100 mA
XC4VLX40 250 1500 110 150 75 105 mA
XC4VLX60 300 1925 225 300 150 250 mA
XC4VLX80 400 2550 280 350 150 275 mA
XC4VLX100 500 3200 335 425 200 300 mA
XC4VLX160 700 3700 500 600 250 400 mA
XC4VLX200 850 3850 500 600 250 400 mA
XC4VSX25 175 725 110 150 75 105 mA
XC4VSX35 250 1350 165 200 100 150 mA
XC4VSX55 400 2225 225 300 150 225 mA
XC4VFX12 111 750 56 100 50 75 mA
XC4VFX20 151 1100 56 100 75 125 mA
XC4VFX40 244 1650 167 250 125 225 mA
XC4VFX60 339 2250 222 350 150 275 mA
XC4VFX100 511 3300 278 500 200 300 mA
XC4VFX140 702 4250 500 825 250 375 mA
Notes:
1. Typical values are specified at nominal voltage, 25°C.
2. Maximum values are specified under worst-case process, voltage, and temperature conditions.
Tabl e 6: Power Supply Ramp Time
Symbol Description Ramp Time Units
V
CCINT
Internal supply voltage relative to GND 0.20 to 50.0 ms
V
CCO
Output drivers supply voltage relative to GND 0.20 to 50.0 ms
V
CCAUX
Auxiliary supply voltage relative to GND 0.20 to 50.0 ms