APA600 datasheet(84/178 Pages) ACTEL

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ProASICPLUS Flash Family FPGAs

2- 74

v5.9

VPP

Programming Supply Pin

This pin may be connected to any voltage between GND

and 16.5 V during normal operation, or it can be left

unconnected.2 For information on using this pin during

programming,

see

the

In-System

Programming

ProASICPLUS Devices application note. Actel recommends

floating the pin or connecting it to VDDP.

VPN

Programming Supply Pin

This pin may be connected to any voltage between 0.5 V

and –13.8 V during normal operation, or it can be left

unconnected.3 For information on using this pin during

programming,

see

the

In-System

Programming

ProASICPLUS Devices application note. Actel recommends

floating the pin or connecting it to GND.

Recommended Design Practice

for VPN/VPP

ProASICPLUS Devices – APA450, APA600,

APA750, APA1000

Bypass capacitors are required from VPP to GND and VPN

to GND for all ProASICPLUS devices during programming.

During the erase cycle, ProASICPLUS devices may have

current surges on the VPP and VPN power supplies. The

only way to maintain the integrity of the power

distribution to the ProASICPLUS device during these

current surges is to counteract the inductance of the

finite length conductors that distribute the power to the

device. This can be accomplished by providing sufficient

bypass capacitance between the VPP and VPN pins and

GND (using the shortest paths possible). Without

sufficient

bypass

capacitance

counteract

the

inductance, the VPP and VPN pins may incur a voltage

spike beyond the voltage that the device can withstand.

This issue applies to all programming configurations.

The solution prevents spikes from damaging the

ProASICPLUS devices. Bypass capacitors are required for

the VPP and VPN pads. Use a 0.01 µF to 0.1 µF ceramic

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 VPP and

VPN pins (Figure 2-46).

ProASICPLUS Devices – APA075, APA150,

APA300

These devices do not require bypass capacitors on the VPP

and VPN pins as long as the total combined distance of

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.

2. There is a nominal 40 k

Ω pull-up resistor on V

PP.

3. There is a nominal 40 k

Ω pull-down resistor on V

PN.

Figure 2-46 • ProASICPLUS VPP and VPN Capacitor Requirements

2.5cm

0.1 µF

0.01 µF

Programming

Header

Supplies

4.7 µF

Actel

ProASIC

Device

0.1 µF

0.01 µF

4.7 µF

PLUS

APA600 Datasheet(PDF) 84 Page - Actel Corporation

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