apa075 Actel Corporation, apa075 Datasheet - Page 80

• Manufacturer Part Number: apa075
• Description: Proasicplus Flash Family Fpgas
• Manufacturer: Actel Corporation

V
This pin may be connected to any voltage between GND
and 16.5 V during normal operation, or it can be left
unconnected.
programming,
ProASIC
floating the pin or connecting it to V
V
This pin may be connected to any voltage between 0.5V
and –13.8 V during normal operation, or it can be left
unconnected.
programming,
ProASIC
floating the pin or connecting it to GND.
Recommended Design Practice
for V
ProASIC
APA750, APA1000
Bypass capacitors are required from V
to GND for all ProASIC
During the erase cycle, ProASIC
current surges on the V
only way to maintain the integrity of the power
distribution to the ProASIC
current surges is to counteract the inductance of the
Figure 1-49 • ProASIC
2. There is a nominal 40 kΩ pull-up resistor on V
3. There is a nominal 40 kΩ pull-down resistor on V
1 -7 4
PP
PN
ProASIC
PLUS
PLUS
PN
PLUS
PLUS
/V
Devices
Devices
2
3
Flash Family FPGAs
For information on using this pin during
For information on using this pin during
PP
Devices – APA450, APA600,
see
see
Programming Supply Pin
Programming Supply Pin
PLUS
application note. Actel recommends
application note. Actel recommends
PLUS
the
the
PP
V
PP
and V
devices during programming.
and V
PLUS
In-System
In-System
ProASIC
PLUS
PN
Device
Actel
PN
device during these
DDP
power supplies. The
Capacitor Requirements
PP
PLUS
devices may have
.
to GND and V
PP
V
V
Programming
Programming
PP
PN
.
PN
.
0.01μF
0.01μF
0.1μF
0.1μF
to
to
2.5cm
PN
v5.5
4.7μF
4.7μF
finite length conductors that distribute the power to the
device. This can be accomplished by providing sufficient
bypass capacitance between the V
GND (using the shortest paths possible). Without
sufficient
inductance, the V
spike beyond the voltage that the device can withstand.
This issue applies to all programming configurations.
The solution prevents spikes from damaging the
ProASIC
the V
capacitor with a 25 V or greater rating. To filter low-
frequency noise (decoupling), use a 4.7 µF (low ESR, <1
<Ω, tantalum, 25 V or greater rating) capacitor. The
capacitors should be located as close to the device pins as
possible (within 2.5 cm is desirable). The smaller, high-
frequency capacitor should be placed closer to the device
pins than the larger low-frequency capacitor. The same
dual-capacitor circuit should be used on both the V
V
ProASIC
APA300
These devices do not require bypass capacitors on the V
and V
the programming cable and the trace length on the
board is less than or equal to 30 inches. Note: For trace
lengths greater than 30 inches, use the bypass capacitor
recommendations in the previous section.
PN
+
+
pins
PP
PN
PLUS
and V
(Figure
pins as long as the total combined distance of
PLUS
bypass
devices. Bypass capacitors are required for
PN
1-49).
Programming
Devices – APA075, APA150,
pads. Use a 0.01 µF to 0.1 µF ceramic
PP
Supplies
Header
capacitance
and V
or
+
_
+
_
PN
pins may incur a voltage
to
PP
and V
counteract
PN
pins and
PP
and
the
PP