M1AFS250-FGG256I Actel Corporation, M1AFS250-FGG256I Datasheet - Page 241

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

Pin Descriptions
Supply Pins
GND
Ground supply voltage to the core, I/O outputs, and I/O logic.
GNDQ
Quiet ground supply voltage to input buffers of I/O banks. Within the package, the GNDQ plane is
decoupled from the simultaneous switching noise originated from the output buffer ground domain. This
minimizes the noise transfer within the package and improves input signal integrity. GNDQ needs to
always be connected on the board to GND. Note: In FG256, FG484, and FG676 packages, GNDQ and
GND pins are connected within the package and are labeled as GND pins in the respective package pin
assignment tables.
ADCGNDREF
Analog ground reference used by the ADC. This pad should be connected to a quiet analog ground.
GNDA
Quiet ground supply voltage to the Analog Block of Fusion devices. The use of a separate analog ground
helps isolate the analog functionality of the Fusion device from any digital switching noise. A 0.2 V
maximum differential voltage between GND and GNDA/GNDQ should apply to system implementation.
GNDAQ
Quiet ground supply voltage to the analog I/O of Fusion devices. The use of a separate analog ground
helps isolate the analog functionality of the Fusion device from any digital switching noise. A 0.2 V
maximum differential voltage between GND and GNDA/GNDQ should apply to system implementation.
Note: In FG256, FG484, and FG676 packages, GNDAQ and GNDA pins are connected within the
package and are labeled as GNDA pins in the respective package pin assignment tables. In FG256 and
GNDNVM
Ground supply used by the Fusion device's flash memory block module(s).
GNDOSC
Ground supply for both integrated RC oscillator and crystal oscillator circuit.
VCC15A
1.5 V clean analog power supply input for use by the 1.5 V portion of the analog circuitry.
VCC33A
3.3 V clean analog power supply input for use by the 3.3 V portion of the analog circuitry.
VCC33N
This is the –3.3 V output from the voltage converter. A 2.2 µF capacitor must be connected from this pin
to ground.
VCC33PMP
3.3 V clean analog power supply input for use by the analog charge pump. To avoid high current draw,
V
VCCNVM
1.5 V power supply input used by the Fusion device's flash memory block module(s). To avoid high
current draw, VCC should be powered up before or simultaneously with V
VCCOSC
Power supply for both integrated RC oscillator and crystal oscillator circuit. The internal 100 MHz
oscillator, powered by the VCCOSC pin, is needed for device programming, operation of the VDDN33
CC33PMP
should be powered up simultaneously with or after V
Ground
Ground (quiet)
Analog Reference Ground
Ground (analog)
Ground (analog quiet)
Flash Memory Ground
Oscillator Ground
Analog Power Supply (1.5 V)
Analog Power Supply (3.3 V)
Negative 3.3 V Output
Analog Power Supply (3.3 V)
Flash Memory Block Power Supply (1.5 V)
Oscillator Power Supply (3.3 V)
R e v i s i o n 1
CC33A
Actel Fusion Family of Mixed Signal FPGAs
.
CCNVM
.
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