DC and Switching Characteristics
Power Supply Specifications
Table 5: Supply Voltage Thresholds for Power-On Reset
Symbol
VCCINTT
VCCAUXT
VCCO2T
Description
Threshold for the VCCINT supply
Min
0.4
1.0
1.0
Max
1.0
Units
V
V
V
Threshold for the VCCAUX supply
2.0
Threshold for the VCCO Bank 2 supply
2.0
Notes:
1.
V
, V
, and V
supplies to the FPGA can be applied in any order. However, the FPGA’s configuration source (Platform Flash,
CCO
CCINT CCAUX
SPI Flash, parallel NOR Flash, microcontroller) might have specific requirements. Check the data sheet for the attached configuration
source. Apply V
information).
last for lowest overall power consumption (see UG331 chapter “Powering Spartan-3 Generation FPGAs” for more
CCINT
2. To ensure successful power-on, V
no dips at any point.
, V
Bank 2, and V
supplies must rise through their respective threshold-voltage ranges with
CCAUX
CCINT CCO
Table 6: Supply Voltage Ramp Rate
Symbol
Description
Min
0.2
0.2
0.2
Max
100
100
100
Units
ms
VCCINTR
VCCAUXR
VCCO2R
Ramp rate from GND to valid VCCINT supply level
Ramp rate from GND to valid VCCAUX supply level
Ramp rate from GND to valid VCCO Bank 2 supply level
ms
ms
Notes:
1.
V
, V
, and V
supplies to the FPGA can be applied in any order. However, the FPGA’s configuration source (Platform Flash,
CCO
CCINT CCAUX
SPI Flash, parallel NOR Flash, microcontroller) might have specific requirements. Check the data sheet for the attached configuration
source. Apply V
information).
last for lowest overall power consumption (see UG331 chapter "Powering Spartan-3 Generation FPGAs" for more
CCINT
2. To ensure successful power-on, V
no dips at any point.
, V
Bank 2, and V
supplies must rise through their respective threshold-voltage ranges with
CCAUX
CCINT CCO
Table 7: Supply Voltage Levels Necessary for Preserving CMOS Configuration Latch (CCL) Contents and RAM
Data
Symbol
VDRINT
VDRAUX
Description
Min
1.0
2.0
Units
VCCINT level required to retain CMOS Configuration Latch (CCL) and RAM data
VCCAUX level required to retain CMOS Configuration Latch (CCL) and RAM data
V
V
12
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DS529-3 (v2.0) August 19, 2010
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