R
Spartan-3 FPGA Family: DC and Switching Characteristics
Table 2: Supply Voltage Thresholds for Power-On Reset
Symbol
VCCINTT
VCCAUXT
VCCO4T
Description
Threshold for the VCCINT supply
Threshold for the VCCAUX supply
Threshold for the VCCO Bank 4 supply
Min
0.4
0.8
0.4
Max
1.0
Units
V
V
V
2.0
1.0
Notes:
1. VCCINT, VCCAUX, and VCCO supplies may be applied in any order.
2. To ensure successful power-on, VCCINT, VCCO Bank 4, and VCCAUX supplies must rise through their respective threshold-voltage
ranges with no dips at any point.
Table 3: Other Power-On Requirements
Symbol
Description
Device Revision
Min
Max
Units
TCCO
VCCO ramp time for all eight banks
0
XC3S200, XC3S400,
and XC3S1500 in the
FT and FG packages(1)
600
-
µs
All other devices
2.0
-
-
ms
Future
To be
improved
Notes:
1. This specification is based on characterization.
2. At present, there are no ramp requirements for the VCCINT and VCCAUX supplies.
Table 4: Power Voltage Levels Necessary for Preserving RAM Contents
Symbol
VDRINT
VDRAUX
Description
VCCINT level required to retain RAM data
VCCAUX level required to retain RAM data
Min
Units
1.0
2.0
V
V
Notes:
1. RAM contents include configuration data.
2. The level of the VCCO supply has no effect on data retention.
2
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DS099-3 (v1.3) March 4, 2004
Advance Product Specification
XILINX [ XILINX, INC ]
