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DS8925 Datasheet(PDF) 4 Page - National Semiconductor (TI) |
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DS8925 Datasheet(HTML) 4 Page - National Semiconductor (TI) |
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4 / 16 page  Switching Characteristics (Notes 4, 5) Over Supply Voltage and Operating Temperature Ranges, unless otherwise specified Symbol Parameter Conditions Min Typ Max Units DIFFERENTIAL DRIVER CHARACTERISTICS t PHLD Differential Propagation Delay High to Low R L = 100Ω,CL = 500 pF, ( Figures 3, 4) C 1 = C2 = 50 pF 70 134 350 ns t PLHD Differential Propagation Delay Low to High 70 141 350 ns t SKD Differential Skew |t PHLD −tPLHD| 7 50 ns t r Rise Time 50 140 300 ns t f Fall Time 50 140 300 ns t PHZ Disable Time High to Z R L = 100Ω,CL = 500 pF ( Figures 7, 8) 300 600 ns t PLZ Disable Time Low to Z 300 600 ns t PZH Enable Time Z to High 160 350 ns t PZL Enable Time Z to Low 160 350 ns SINGLE ENDED DRIVER CHARACTERISTICS t PHL Propagation Delay High to Low R L = 450Ω,CL = 500 pF ( Figures 5, 6) 70 120 350 ns t PLH Propagation Delay Low to High 70 150 350 ns t SK Skew, |t PHL −tPLH 30 70 ns t r Rise Time 50 100 300 ns t f Fall Time 20 50 300 ns RECEIVER CHARACTERISTICS t PHL Propagation Delay High to Low C L = 15 pF ( Figures 9, 10) 10 33 75 ns t PLH Propagation Delay Low to High 10 30 75 ns t SK Skew, |t PHL −tPLH| 320 ns Note 1: Absolute Maximum Ratings are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the devices should be operated at these limits. The table of Electrical Characteristics specifies conditions of device operation. Note 2: Current into device pins is defined as positive. Current out of device pins is defined as negative. All voltages are referenced to ground except VOD,VOD1, VOD2, and VSS. Note 3: All typicals are given for: VCC = +5.0V, VEE = −5.0V, TA = +25˚C unless otherwise specified. Truth Tables Driver (D1) Inputs Outputs D EN1 D IN1 D OUT1+DOUT1− HX Z Z LL L H LH H L Driver (D2) Input Output D IN2 D OUT2− LH HL H = Logic High Level (Steady State) L = Logic Low Level (Steady State) X = Irrelevant (Any Input) Z = Off State (TRI-STATE, High Impedance) †OPEN = Non-Terminated Receiver (1) Input Output R IN1−ROUT1 ≤−200 mV H ≥+200 mV L OPEN † H Receiver (2) Inputs Output R IN2+−RIN2−ROUT2 ≤−200 mV L ≥+200 mV H OPEN † H Receiver (3) Input Output R IN3+ROUT3 ≤−200 mV L ≥+200 mV H OPEN † H www.national.com 4 |
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