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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LFSC датащи(PDF) 53 Page - Lattice Semiconductor |
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LFSC датащи(HTML) 53 Page - Lattice Semiconductor |
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53 / 237 page  3-9 DC and Switching Characteristics Lattice Semiconductor LatticeSC/M Family Data Sheet BLVDS The LatticeSC devices support BLVDS standard. This standard is emulated using controlled impedance comple- mentary LVCMOS outputs in conjunction with a parallel external resistor across the driver outputs. BLVDS is intended for use when multi-drop and bi-directional multi-point differential signaling is required. The scheme shown in Figure 3-2 is one possible solution for bi-directional multi-point differential signals. Figure 3-2. BLVDS Multi-point Output Example Table 3-2. BLVDS DC Conditions 1 Over Recommended Operating Conditions Nominal Symbol Description Zo = 45 Zo = 90 Units ZOUT Output impedance 100 100 ohm RTLEFT Left end termination 45 90 ohm RTRIGHT Right end termination 45 90 ohm VOH Output high voltage 1.375 1.48 V VOL Output low voltage 1.125 1.02 V VOD Output differential voltage 0.25 0.46 V VCM Output common mode voltage 1.25 1.25 V IDC DC output current 11.2 10.2 mA 1. For input buffer, see LVDS table. Heavily loaded backplane, effective Zo ~ 45 to 90 ohms differential 100 100 2.5V 2.5V 100 100 2.5V 2.5V 100 100 2.5V 2.5V + - 100 100 2.5V 2.5V + - . . . 45-90 ohms, +/- 1% 45-90 ohms, +/- 1% - + + - . . . - % - + |
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