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LTC1334IG Datasheet(PDF) 4 Page - Linear Technology |
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LTC1334IG Datasheet(HTML) 4 Page - Linear Technology |
4 / 16 page 4 LTC1334 AC ELECTRICAL CHARACTERISTICS Note 1: Absolute Maximum Ratings are those values beyond which the safety of the device cannot be guaranteed. 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: All typicals are given at VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF and TA = 25°C. Note 4: Short-circuit current for RS485 driver output low state folds back above VCC. Peak current occurs around VO = 3V. Note 5: The “B” RS232 receiver output is disabled in RS485 mode (SEL1 = SEL2 = high). The unused output driver goes into a high impedance mode and has a resistor to VCC. See Applications Information section for more details. TYPICAL PERFORMANCE CHARACTERISTICS Receiver Output High Voltage vs Temperature TEMPERATURE ( °C) –50 5.0 4.9 4.8 4.7 4.6 4.5 4.4 4.3 4.2 4.1 4.0 0 50 75 LTC1334 • TPC01 –25 25 100 125 IOUT = 3mA VCC = 5V TEMPERATURE ( °C) –50 20 18 16 14 12 10 8 6 4 2 0 0 50 75 LTC1334 • TPC03 –25 25 100 125 VCC = 5V RS485 Receiver Skew tPLH – tPHL vs Temperature TEMPERATURE ( °C) –50 0.5 0.4 0.3 0.2 0.1 0 0 50 75 LTC1334 • TPC02 –25 25 100 125 IOUT = 3mA VCC = 5V Receiver Output Low Voltage vs Temperature The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 5V, C1 = C2 = C3 = C4 = 0.1µF (Notes 2, 3) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS RS485 Mode (SEL1 = SEL2 = High) tZL Driver Enable to Output Low Figures 3, 7, CL = 100pF, S1 Closed q 50 90 ns tZH Driver Enable to Output High Figures 3, 7, CL = 100pF, S2 Closed q 50 90 ns tLZ Driver Disable from Low Figures 3, 7, CL = 15pF, S1 Closed q 50 90 ns tHZ Driver Disable from High Figures 3, 7, CL = 15pF, S2 Closed q 60 90 ns tPLH Receiver Input to Output Figures 2, 8, RL = 54Ω, CL = 100pF q 20 60 140 ns tPHL Receiver Input to Output Figures 2, 8, RL = 54Ω, CL = 100pF q 20 70 140 ns tSKEW Differential Receiver Skew, tPLH – tPHL Figures 2, 8, RL = 54Ω, CL = 100pF 10 ns |
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