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PCI7421 Datasheet(PDF) 295 Page - Texas Instruments |
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PCI7421 Datasheet(HTML) 295 Page - Texas Instruments |
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295 / 298 page  14−5 14.4 Electrical Characteristics Over Recommended Ranges of Operating Conditions (unless otherwise noted) 14.4.1 Device PARAMETER TEST CONDITION MIN MAX UNIT VTH Power status threshold, CPS input† 400-k Ω resistor† 4.7 7.5 V VO TPBIAS output voltage At rated IO current 1.665 2.015 V II Input current (PC0−PC2 inputs) VCC = 3.6 V 5 µA † Measured at cable power side of resistor. 14.4.2 Driver PARAMETER TEST CONDITION MIN MAX UNIT VOD Differential output voltage 56 Ω, See Figure 14−1 172 265 mV IDIFF Driver difference current, TPA+, TPA−, TPB+, TPB− Drivers enabled, speed signaling off −1.05† 1.05† mA ISP200 Common-mode speed signaling current, TPB+, TPB− S200 speed signaling enabled −4.84‡ −2.53‡ mA ISP400 Common-mode speed signaling current, TPB+, TPB− S400 speed signaling enabled −12.4‡ −8.10‡ mA VOFF Off state differential voltage Drivers disabled, See Figure 14−1 20 mV † Limits defined as algebraic sum of TPA+ and TPA− driver currents. Limits also apply to TPB+ and TPB− algebraic sum of driver currents. ‡ Limits defined as absolute limit of each of TPB+ and TPB− driver currents. TPAx+ TPBx+ TPAx− TPBx− 56 Ω Figure 14−1. Test Load Diagram 14.4.3 Receiver PARAMETER TEST CONDITION MIN TYP MAX UNIT ZID Differential impedance Drivers disabled 4 7 k Ω ZID Differential impedance Drivers disabled 4 pF ZIC Common-mode impedance Drivers disabled 20 k Ω ZIC Common-mode impedance Drivers disabled 24 pF VTH−R Receiver input threshold voltage Drivers disabled −30 30 mV VTH−CB Cable bias detect threshold, TPBx cable inputs Drivers disabled 0.6 1.0 V VTH+ Positive arbitration comparator threshold voltage Drivers disabled 89 168 mV VTH− Negative arbitration comparator threshold voltage Drivers disabled −168 −89 mV VTH−SP200 Speed signal threshold TPBIAS−TPA common mode voltage, drivers disabled 49 131 mV VTH−SP400 Speed signal threshold TPBIAS−TPA common mode voltage, drivers disabled 314 396 mV |
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