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LT1791CS Datasheet(PDF) 3 Page - Linear Technology |
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LT1791CS Datasheet(HTML) 3 Page - Linear Technology |
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3 / 12 page  3 LT1785/LT1785A LT1791/LT1791A DC ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VOD1 Differential Driver Output Voltage (Unloaded) IO = 0 q 4.1 5 V VOD2 Differential Driver Output Voltage (With Load) R = 50 Ω (RS422), Figure 1 q 2.0 2.70 V R = 27 Ω (RS485), Figure 1 q 1.5 2.45 V R = 18 Ω q 1.2 2.2 V ∆VOD Change in Magnitude of Driver Differential Output R = 27 Ω or R = 50Ω, Figure 1 q 0.2 V Voltage for Complementary Output States VOC Driver Common Mode Output Voltage R = 27 Ω or R = 50Ω, Figure 1 q 2 2.5 3 V ∆VOC Change in Magnitude of Driver Common Mode R = 27 Ω or R = 50Ω, Figure 1 q 0.2 V Output Voltage for Complementary Output States VIH Input High Voltage DI, DE, RE q 2V VIL Input Low Voltage DI, DE, RE q 0.8 V IIN1 Input Current DI, DE, RE q 5 µA IIN2 Input Current (A, B); (LT1791 or LT1785 with VIN = 12V q 0.15 0.3 mA DE = 0V) VIN = – 7V q – 0.15 – 0.08 mA – 60V ≤ VIN ≤ 60V q –6 6 mA VTH Differential Input Threshold Voltage for Receiver LT1785/LT1791: – 7V ≤ VCM ≤ 12V q – 0.2 0.2 V LT1785A/LT1791A: – 7V ≤ VCM ≤ 12V q – 0.2 0 V ∆VTH Receiver Input Hysteresis – 7V < VCM < 12V 20 mV VOH Receiver Output High Voltage IO = – 400µA, VID = 200mV q 3.5 4 V VOL Receiver Output Low Voltage IO = 1.6mA, VID = – 200mV q 0.3 0.5 V Three-State (High Impedance) Output Current RE > 2V or Power Off q –1 1 µA at Receiver 0V < VOUT < 6V RIN Receiver Input Resistance (LT1791) – 7V ≤ VCM ≤ 12V q 85 125 k Ω – 60V ≤ VCM ≤ 60V 125 k Ω LT1785 – 7V ≤ VCM ≤ 12V q 50 90 k Ω RS485 Unit Load 0.25 ISC Driver Short-Circuit Current VOUT = HIGH, Force VO = – 7V q 35 250 mA VOUT = LOW, Force VO = 12V q 35 250 mA Driver Output Fault Current VO = 60V q 6mA VO = – 60V q –6 mA Receiver Short-Circuit Current 0V ≤ VO ≤ VCC q ±30 mA Driver Three-State Output Current –7V ≤ VO ≤ 12V q – 0.2 0.3 mA – 60V ≤ VO ≤ 60V q –6 6 mA ICC Supply Current No Load, RE = 0V, DE = 5V q 5.5 9 mA No Load, RE = 5V, DE = 5V q 5.5 9 mA No Load, RE = 0V, DE = 0V q 4.5 8 mA No Load, RE = 5V, DE = 0V q 0.2 0.3 mA The q denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C, VCC = 5V. |
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