R
XC4000E and XC4000X Series Field Programmable Gate Arrays
6-74
DS005 (v. 1.8 October 18, 1999 - Product Specication
D.C. Characteristics Over Recommended Operating Conditions
Power-0n Power Supply Requirements
Xilinx FPGAs require a minimum rated power supply current capacity to insure proper initialization, and the power supply
ramp-up time does affect the current required. A fast ramp-up time requires more current than a slow ramp-up time. The
slowest ramp-up time is 50 ms. Current capacity is not specied for a ramp-up time faster than 2ms. The current capacity
varies linealy with ramp-up time,
e.g., an XC4036XL with a ramp-up time of 25 ms would require a capacity predicted by the
point on the straight line drawn from 1A at 120
s to 500 mA at 50 ms at the 25 ms time mark. This point is approximately
750 mA .
Symbol
Description
Min
Max
Units
VOH
High-level output voltage @ IOH = -4.0 mA, VCC min (LVTTL)
2.4
V
High-level output voltage @ IOH = -500 A, (LVCMOS)
90% VCC
V
VOL
Low-level output voltage @ IOL = 12.0 mA, VCC min (LVTTL) (Note 1)
0.4
V
Low-level output voltage @ IOL = 1500 A, (LVCMOS)
10% VCC
V
VDR
Data Retention Supply Voltage (below which configuration data may be lost)
2.5
V
ICCO
Quiescent FPGA supply current (Note 2)
5
mA
IL
Input or output leakage current
-10
+10
A
CIN
Input capacitance (sample tested)
BGA, SBGA, PQ, HQ, MQ
packages
10
pF
PGA packages
16
pF
IRPU
Pad pull-up (when selected) @ Vin = 0 V (sample tested)
0.02
0.25
mA
IRPD
Pad pull-down (when selected) @ Vin = 3.6 V (sample tested)
0.02
0.15
mA
IRLL
Horizontal Longline pull-up (when selected) @ logic Low
0.3
2.0
mA
Note 1:
With up to 64 pins simultaneously sinking 12 mA.
Note 2:
With no output current loads, no active input or Longline pull-up resistors, all I/O pins Tri-stated and oating.
Product
Description
Ramp-up Time
Fast (120
s)
Slow (50 ms)
XC4005 - 36XL
Minimum required current supply
1 A
500 mA
XC4044- 62XL
Minimum required current supply
2 A
500 mA
XC4085XL1
Minimum required current supply
2 A1
500 mA
Notes:
1. The XC4085XL fast ramp-up time is 5 ms.
Devices are guaranteed to initialize properly with the minimum current listed above. A larger capacity power supply may
result in a larger initialization current.
This specication applies to Commercial and Industrial grade products only.
Ramp-up Time is measured from 0 VDC to 3.6 VDC. Peak current required lasts less than 3 ms, and occurs near the
internal power on reset threshold voltage. After initialization and before conguration, ICCmax is less than 10 mA.