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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ORSPI4 датащи(PDF) 177 Page - Lattice Semiconductor |
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ORSPI4 датащи(HTML) 177 Page - Lattice Semiconductor |
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177 / 263 page  Lattice Semiconductor ORCA ORSPI4 Data Sheet 177 Figure 88. Output Buffer Delays Table 57. LVDS Driver AC Data 1 Termination Resistor The LVDS drivers and receivers operate at 100 Ω differential impedance, as shown below. External resistors are not required. The differential driver and receiver buffers include termination resistors inside the device package, as shown in Figure 89 below. The center tap inputs should be connected to ground via a .01 pF capacitor. Figure 89. SPI4 LVDS Driver and Receiver and Associated Internal Components Parameter Symbol Test Conditions Min. Typ. Max. Units VOD Fall Time, 80% to 20% tF ZL = 100 Ω ± 1% CPAD = 3.0 pF, CPAD = 3.0 pF 100 — 210 ps VOD Rise Time, 20% to 80% tR ZL = 100 Ω ± 1% CPAD = 3.0 pF, CPAD = 3.0 pF 100 — 210 ps Differential Skew |tPHLA – tPLHB| or |tPHLB – tPLHA|tSKEW1 Any differential pair on pack- age at 50% point of the tran- sition — — 50 ps 1. VDD33 = 3.1V - 3.5 V, VDD15 = 1.4V - 1.6 V, -40˚C. PAD OUT PAD OUT 3pF 3pF ts[i] out[i] LVDS Receiver 50 Ω LVDS Driver 100 Ω 50 Ω Center Tap External Device Pins |
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