M1AFS250-FGG256I Actel Corporation, M1AFS250-FGG256I Datasheet - Page 36

• Manufacturer Part Number: M1AFS250-FGG256I
• Description: Actel Fusion Family Of Mixed Signal Fpgas
• Manufacturer: Actel Corporation

Device Architecture
2- 20
RC Oscillator
The RC oscillator is an on-chip free-running clock source generating a 100 MHz clock. It can be used as
a source clock for both on-chip and off-chip resources. When used in conjunction with the Fusion PLL
and CCC circuits, the RC oscillator clock source can be used to generate clocks of varying frequency
and phase.
The Fusion RC oscillator is very accurate at ±1% over commercial and industrial temperature ranges. It
is an automated clock, requiring no setup or configuration by the user. It requires only that the power and
GNDOSC pins be connected; no external components are required. The RC oscillator can be used to
drive either a PLL or another internal signal.
RC Oscillator Characteristics
Table 2-9 • Electrical Characteristics of RC Oscillator
Parameter
F
I
DYNRC
RC
Operating
Frequency
Accuracy
Output Jitter
Output Duty Cycle
Operating Current
Description
Temperature: 0°C to 85°C
Voltage: 3.3 V ± 5%
Temperature: –40°C to 125°C
Voltage: 3.3 V ± 5%
Period Jitter (at 5 k cycles)
Cycle–Cycle Jitter (at 5 k cycles)
Period Jitter (at 5 k cycles) with
1 KHz / 300 mV peak-to-peak noise
on power supply
Cycle–Cycle Jitter (at 5 k cycles) with
1 KHz / 300 mV peak-to-peak noise
on power supply
R e visio n 1
Conditions
Min.
Typ.
100
100
100
150
150
50
1
3
1
Max. Units
MHz
mA
ps
ps
ps
ps
%
%
%