XC3S5000-5FGG676C Datasheet, PDF (96/272 Pages) Xilinx, Inc – Introduction and Ordering Information

Spartan-3 FPGA Family: DC and Switching Characteristics
Table 61: Switching Characteristics for the DFS
Symbol
Description
Frequency
Mode
Device
Speed Grade
-5
-4
Units
Min Max Min Max
Output Frequency Ranges
CLKOUT_FREQ_FX_LF
CLKOUT_FREQ_FX_HF
Frequency for the CLKFX and
CLKFX180 outputs
Low
High
All
18 210 18 210 MHz
All
210 326⁽²⁾ 210 307⁽²⁾ MHz
Output Clock Jitter
CLKOUT_PER_JITT_FX
Period jitter at the CLKFX and
CLKFX180 outputs
All
All
Note 3 Note 3 Note 3 Note 3 ps
Duty Cycle⁽⁴⁾
CLKOUT_DUTY_CYCLE_FX Duty cycle precision for the CLKFX
All
XC3S50 – ±100 – ±100 ps
and CLKFX180 outputs
XC3S200 – ±100 – ±100 ps
XC3S400 – ±250 – ±250 ps
XC3S1000 – ±400 – ±400 ps
XC3S1500 – ±400 – ±400 ps
XC3S2000 – ±400 – ±400 ps
XC3S4000 – ±400 – ±400 ps
XC3S5000 – ±400 – ±400 ps
Phase Alignment
CLKOUT_PHASE
Phase offset between the DFS
output and the CLK0 output
All
All
– ±300 – ±300 ps
Lock Time
LOCK_DLL_FX
When using the DFS in conjunction
All
with the DLL: The time from
deassertion at the DCM’s Reset
input to the rising transition at its
LOCKED output. When the DCM is
locked, the CLKIN and CLKFB
signals are in phase.
All
– 10.0 – 10.0 ms
LOCK_FX
When using the DFS without the
All
DLL: The time from deassertion at
the DCM’s Reset input to the rising
transition at its LOCKED output. By
asserting the LOCKED signal, the
DFS indicates valid CLKFX and
CLKFX180 signals.
All
– 10.0 – 10.0 ms
Notes:
1. The numbers in this table are based on the operating conditions set forth in Table 32 and Table 60.
2. Mask revisions prior to the E mask revision have a CLKOUT_FREQ_FX_HF max of 280 MHz. See Mask and Fab Revisions, page 58.
3. Use the DCM Clocking Wizard in the ISE software for a Spartan-3 device specific number. Jitter number assumes 150 ps of input clock jitter.
4. The CLKFX and CLKFX180 outputs always approximate 50% duty cycles.
5. DFS specifications apply when either of the DFS outputs (CLKFX or CLKFX180) is in use.
DS099 (v3.1) June 27, 2013
www.xilinx.com
Product Specification
96