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LCMXO2-256ZE-1SG32C 数据表(PDF) 49 Page - Lattice Semiconductor |
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LCMXO2-256ZE-1SG32C 数据表(HTML) 49 Page - Lattice Semiconductor |
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49 / 106 page  3-10 DC and Switching Characteristics MachXO2 Family Data Sheet LVDS Emulation MachXO2 devices can support LVDS outputs via emulation (LVDS25E). The output is emulated using complemen- tary LVCMOS outputs in conjunction with resistors across the driver outputs on all devices. The scheme shown in Figure 3-1 is one possible solution for LVDS standard implementation. Resistor values in Figure 3-1 are industry standard values for 1% resistors. Figure 3-1. LVDS Using External Resistors (LVDS25E) Table 3-1. LVDS25E DC Conditions Over Recommended Operating Conditions Parameter Description Typ. Units ZOUT Output impedance 20 Ohms RS Driver series resistor 158 Ohms RP Driver parallel resistor 140 Ohms RT Receiver termination 100 Ohms VOH Output high voltage 1.43 V VOL Output low voltage 1.07 V VOD Output differential voltage 0.35 V VCM Output common mode voltage 1.25 V ZBACK Back impedance 100.5 Ohms IDC DC output current 6.03 mA 158 158 Zo = 100 140 100 On-chip On-chip Off-chip Off-chip VCCIO = 2.5 8mA 8mA Note: All resistors are ±1%. VCCIO = 2.5 + - Emulated LVDS Buffer |
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