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LT1791IS-TRPBF Datasheet(PDF) 4 Page - Linear Technology |
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LT1791IS-TRPBF Datasheet(HTML) 4 Page - Linear Technology |
4 / 16 page LT1785/LT1785A/ LT1791/LT1791A 4 178591fb DC ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C, VCC = 5V. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VOD1 Differential Driver Output Voltage (Unloaded) IO = 0 l 4.1 5 V VOD2 Differential Driver Output Voltage (With Load) R = 50Ω (RS422), Figure 1 R = 27Ω (RS485), Figure 1 R = 18Ω l l l 2.0 1.5 1.2 2.70 2.45 2.2 V V V VOD Change in Magnitude of Driver Differential Output Voltage for Complementary Output States R = 27Ω or R = 50Ω, Figure 1 l 0.2 V VOC Driver Common Mode Output Voltage R = 27Ω or R = 50Ω, Figure 1 l 2 2.5 3 V Δ|VOC| Change in Magnitude of Driver Common Mode Output Voltage for Complementary Output States R = 27Ω or R = 50Ω, Figure 1 l 0.2 V VIH Input High Voltage DI, DE, RE l 2V VIL Input Low Voltage DI, DE, RE l 0.8 V IIN1 Input Current DI, DE, RE l 5μA IIN2 Input Current (A, B); (LT1791 or LT1785 with DE = 0V) VIN = 12V VIN = –7V –60V ≤ VIN ≤ 60V l l l –0.15 –6 0.15 –0.08 0.3 6 mA mA mA VTH Differential Input Threshold Voltage for Receiver LT1785/LT1791: –7V ≤ VCM ≤ 12V LT1785A/LT1791A: –7V ≤ VCM ≤ 12V l l –0.2 –0.2 0.2 0 V V ΔVTH Receiver Input Hysteresis –7V < VCM < 12V 20 mV VOH Receiver Output High Voltage IO = –400μA, VID = 200mV l 3.5 4 V VOL Receiver Output Low Voltage IO = 1.6mA, VID = –200mV l 0.3 0.5 V Three-State (High Impedance) Output Current at Receiver 0V < VOUT < 6V RE > 2V or Power Off l –1 1 μA RIN Receiver Input Resistance (LT1791) –7V ≤ VCM ≤ 12V – 60V ≤ VCM ≤ 60V l 85 125 125 kΩ kΩ LT1785 –7V ≤ VCM ≤ 12V l 50 90 kΩ RS485 Unit Load 0.25 ISC Driver Short-Circuit Current VOUT = HIGH, Force VO = –7V VOUT = LOW, Force VO = 12V l l 35 35 250 250 mA mA Driver Output Fault Current VO = 60V VO = –60V l l –6 6mA mA Receiver Short-Circuit Current 0V ≤ VO ≤ VCC l ±35 mA Driver Three-State Output Current –7V ≤ VO ≤ 12V –60V ≤ VO ≤ 60V l l –0.2 –6 0.3 6 mA mA ICC Supply Current No Load, RE = 0V, DE = 5V No Load, RE = 5V, DE = 5V No Load, RE = 0V, DE = 0V No Load, RE = 5V, DE = 0V l l l l 5.5 5.5 4.5 0.2 9 9 8 0.3 mA mA mA mA |
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