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IMX8MPCEC Datasheet(PDF) 42 Page - NXP Semiconductors |
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IMX8MPCEC Datasheet(HTML) 42 Page - NXP Semiconductors |
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42 / 111 page  i.MX 8M Plus Applications Processor Datasheet for Consumer Products, Rev. 0, 03/2021 42 NXP Semiconductors Electrical characteristics NOTE DDR I/O output driver impedance is measured with “long” transmission line of impedance Ztl attached to I/O pad and incident wave launched into transmission line. Rpu/Rpd and Ztl form a voltage divider that defines specific voltage of incident wave relative to OVDD. Output driver impedance is calculated from this voltage divider (see Figure 10). Figure 10. Impedance matching load for measurement ipp_do Cload = 1p Ztl W, L = 20 inches predriver PMOS (Rpu) NMOS (Rpd) pad OVDD OVSS t,(ns) 0 U,(V) OVDD t,(ns) 0 VDD Vin (do) Vout (pad) U,(V) Vref Rpu = Vovdd - Vref1 Vref1 x Ztl Rpd = x Ztl Vref2 Vovdd - Vref2 Vref1 Vref2 |
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