M1AFS250-FGG256I Actel Corporation, M1AFS250-FGG256I Datasheet - Page 165

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

Table 2-74 • Comparison Table for 5 V–Compliant Receiver Scheme
Schem
e
1
2
3
4
Notes:
1. Speed and current consumption increase as the board resistance values decrease.
2. Resistor values ensure I/O diode long-term reliability.
Two resistors
Resistor and Zener 3.3 V
Bus switch
Minimum resistor value
R = 47 Ω at T
R = 150 Ω at T
R = 420 Ω at T
Board Components
J
J
J
= 70°C
= 85°C
= 100°C
2
Low to high
Medium
Medium
Speed
High
1
Limited by transmitter's drive strength
Limited by transmitter's drive strength
N/A
Maximum diode current at 100% duty cycle, signal constantly
at '1'
52.7 mA at T
16.5 mA at T
5.9 mA at T
For duty cycles other than 100%, the currents can be
increased by a factor = 1 / (duty cycle).
Example: 20% duty cycle at 70°C
Maximum current = (1 / 0.2) * 52.7 mA = 5 * 52.7 mA = 263.5
mA
R e v i s i o n 1
J
J
J
= 100°C / 10-year lifetime
=70°C / 10-year lifetime
= 85°C / 10-year lifetime
Current Limitations
Actel Fusion Family of Mixed Signal FPGAs
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