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ST485CN Datasheet(PDF) 6 Page - STMicroelectronics |
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ST485CN Datasheet(HTML) 6 Page - STMicroelectronics |
6 / 19 page Electrical characteristics ST485 6/19 4 Electrical characteristics VCC = 5V ± 5%, TA = TMIN to TMAX , unless otherwise specified. Typical values are referred to TA = 25°C) Table 5. DC Electrical characteristics Symbol Parameter Test conditions (1) Value Unit -40 to 85 °C -55 to 125 °C Min Typ Max Min Max VOD1 Differential Driver Output (No Load) 55 V VOD2 Differential Driver Output (With Load) RL = 27Ω (RS-485) (Figure 2.) RL = 50Ω (RS-422) (Figure 2.) 1.5 5 5 1.4 5 5 V V ∆VOD Change in Magnitude of Driver Differential Output Voltage for Complementary Output States RL = 27Ω or 50Ω (Figure 2.)0.2 0.2 V VOC Driver Common-Mode Output Voltage RL = 27Ω or 50Ω (Figure 2.)3 3 V ∆VOC Change in Magnitude of Driver Common-Mode Output Voltage for Complementary Output States RL = 27Ω or 50Ω (Figure 2.)0.2 0.2 V VIH Input High Voltage RE, DE, DI 2.0 2.0 V VIL Input Low Voltage RE, DE, DI 0.8 0.8 V IIN1 Input Current RE, DE, DI ± 2 ± 2µA IIN2 Input Current (A, B) VCM = 0V or 5.25VVDE = 0V VIN = 12V VIN = -7V 1 -0.8 1 -0.8 mA mA VTH Receiver Differential Threshold Voltage VCM = -7 to 12V -0.2 0.2 -0.2 0.2 V ∆VTH Receiver Input Hysteresis VCM = 0V 70 mV VOH Receiver Output High Voltage IO = -4mAVID = 200mV 3.5 3.4 V VOL Receiver Output Low Voltage IO = 4mAVID = -200mV 0.4 0.55 V IOZR 3-State (High Impedance) Output Current at Receiver VO = 0.4 to 2.4V ± 1 ± 1µA RIN Receiver Input Resistance VCM = -7 to 12V 24 24 K Ω |
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