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80960KB Arkusz danych(PDF) 20 Page - Intel Corporation |
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80960KB Arkusz danych(HTML) 20 Page - Intel Corporation |
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20 / 44 page ![]() 80960KB 14 of a matched diode bridge. Since the open-drain outputs sink current, only the IOL legs of the bridge are necessary and the IOH legs are not used. When the 80960KB driver under test is turned off, the output pin is pulled up to VREF (i.e., VOH). Diode D1 is turned off and the IOL current source flows through diode D2. When the 80960KB open-drain driver under test is on, diode D1 is also on and the voltage on the pin being tested drops to VOL. Diode D2 turns off and IOL flows through diode D1. Figure 12. Test Load Circuit for Three-State Output Pins Figure 13. Test Load Circuit for Open-Drain Output Pins THREE-STATE OUTPUT CL = 50 pF for all signals CL CL OPEN-DRAIN OUTPUT IOL D2 IOL Tested at 25 mA VREF = VCC D1 and D2 are matched D1 CL = 50 pF for all signals |
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