AFS090 datasheet(165/334 Pages) MICROSEMI

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Fusion Family of Mixed Signal FPGAs

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Table 2-77 • Comparison Table for 5 V–Compliant Receiver Scheme

Schem

Board Components

Speed

Current Limitations

Two resistors

Low to high1 Limited by transmitter's drive strength

Resistor and Zener 3.3 V

Medium

Limited by transmitter's drive strength

Bus switch

High

N/A

Minimum resistor value2

R = 47

Ω at TJ = 70°C

R = 150

Ω at TJ = 85°C

R = 420

Ω at TJ = 100°C

Medium

Maximum diode current at 100% duty cycle, signal constantly

at '1'

52.7 mA at TJ =70°C / 10-year lifetime

16.5 mA at TJ = 85°C / 10-year lifetime

5.9 mA at TJ = 100°C / 10-year lifetime

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

Notes:

1. Speed and current consumption increase as the board resistance values decrease.

2. Resistor values ensure I/O diode long-term reliability.

AFS090 数据表(PDF) 165 Page - Microsemi Corporation

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