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LTC2871IUHFPBF Datasheet(PDF) 6 Page - Linear Technology |
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LTC2871IUHFPBF Datasheet(HTML) 6 Page - Linear Technology |
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6 / 36 page  LTC2870/LTC2871 6 28701f ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = VL = 3.3V, TE485 = 0V, LB = 0V unless otherwise noted. VL ≤ VCC. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS RS485 AC Characteristics Maximum Data Rate (Note 3) l 20 Mbps tPLHD485 tPHLD485 Driver Propagation Delay RDIFF = 54Ω, CL = 100pF (Figure 4) l 20 70 ns Driver Propagation Delay Difference |tPLHD485 – tPHLD485| RDIFF = 54Ω, CL = 100pF (Figure 4) l 16 ns tSKEWD485 Driver Skew (Y to Z) RDIFF = 54Ω, CL = 100pF (Figure 4) l 1±6 ns tRD485, tFD485 Driver Rise or Fall Time RDIFF = 54Ω, CL = 100pF (Figure 4) l 15 ns tZLD485, tZHD485, tLZD485, tHZD485 Driver Output Enable or Disable Time FEN = VL, RL = 500Ω, CL = 50pF (Figure 5) l 120 ns tZHSD485, tZLSD485 Driver Enable from Shutdown RL = 500Ω, CL = 50pF (Figure 5) l 8μs tPLHR485, tPHLR485 Receiver Input to Output CL = 15pF, VCM = 1.5V, |A – B| = 1.5V (Figure 6) (Note 5) l 65 85 ns tSKEWR485 Differential Receiver Skew |tPLHR485 – tPHLR485| CL = 15pF (Figure 6) l 16 ns tRR485, tFR485 Receiver Output Rise or Fall Time CL = 15pF (Figure 6) l 315 ns tZLR485, tZHR485, tLZR485, tHZR485 Receiver Output Enable or Disable Time FEN = VL, RL = 1kΩ, CL = 15pF (Figure 7) l 50 ns tRTEN485, tRTZ485 Termination Enable or Disable Time FEN = VL, VB = 0V, VAB = 2V (Figure 8) (Note 5) l 100 μs RS232 AC Characteristics Maximum Data Rate RL = 3kΩ, CL = 2500pF RL = 3kΩ, CL = 500pF (Note 3) l l 100 500 kbps kbps Driver Slew Rate (Figure 9) RL = 3kΩ, CL = 2500pF RL = 3kΩ, CL = 50pF l l 4 30 V/μs V/μs tPHLD232, tPLHD232 Driver Propagation Delay RL = 3kΩ, CL = 50pF (Figure 9) l 12 μs tSKEWD232 Driver Skew RL = 3kΩ, CL = 50pF (Figure 9) 50 ns tZLD232, tZHD232, tLZD232, tHZD232 Driver Output Enable or Disable Time FEN = VL, RL = 3kΩ, CL = 50pF (Figure 10) l 0.4 2 μs tPHLR232, tPLHR232 Receiver Propagation Delay CL = 150pF (Figure 11) l 60 200 ns tSKEWR232 Receiver Skew CL = 150pF (Figure 11) 25 ns tRR232, tFR232 Receiver Rise or Fall Time CL = 150pF (Figure 11) l 60 200 ns tZLR232, tZHR232, tLZR232, tHZR232 Receiver Output Enable or Disable Time FEN = VL, RL = 1kΩ, CL = 150pF (Figure 12) l 0.7 2 μs Power Supply Generator VDD/VEE Supply Rise Time FEN = , (Notes 3 and 4) l 0.2 2 ms Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to device ground unless otherwise specified. Note 3: Guaranteed by other measured parameters and not tested directly. Note 4: Time from FEN until VDD ≥ 5V and VEE ≤ –5V. External components as shown in the Typical Application section. Note 5: Condition applies to A, B for H/F = 0V, and Y, Z for H/F = VL. Note 6: This IC includes overtemperature protection that is intended to protect the device during momentary overload conditions. Overtemperature protection activates at a junction temperature exceeding 150°C. Continuous operation above the specified maximum operating junction temperature may result in device degradation or failure. Note 7: Guaranteed by design and not subject to production test. |
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