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ST485ABN 데이터시트(PDF) 7 Page - STMicroelectronics |
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ST485ABN 데이터시트(HTML) 7 Page - STMicroelectronics |
7 / 19 page ST485A Electrical characteristics 7/19 4.3 Receiver (VCC = 4.5V to 5.5V, TA = -40 to 85°C, unless otherwise specified. Typical values are referred to TA = 25°C, VCC = 5V) (Note: 1) 4.4 Driver switching (VCC = 4.5V to 5.5V, TA = -40 to 85°C, unless otherwise specified. Typical values are referred to TA = 25°C, VCC = 5V) (See Note: 1, 3) Table 8. Receiver electrical characteristics Symbol Parameter Test conditions Min Typ Max Unit VTH Receiver Differential Threshold Voltage VCM = -7V to 12V -0.2 0.2 V ∆V TH Receiver Input Hysteresis VCM = 0V 70 mV VOH Receiver Output High Voltage IOUT = -4mA, VID = 200mV 3.5 4.7 V VOL Receiver Output Low Voltage IOUT = 4mA, VID = -200mV 0.2 0.4 V IOZR 3-State (High Impedance) Output Current at Receiver VO = 0.4V to 2.4V ± 1 µA RRIN Receiver Input Resistance VCM = -7V to 12V 12 24 K Ω IOSR Receiver Short-Circuit Current VO = 0V to VCC 795 mA Table 9. Driver switching characteristics Symbol Parameter Test conditions Min Typ Max Unit DR Maximum data rate Jitter < 5% 30 50 Mbps tPLH tPHL Propagation delay input to output RL= 54Ω, CL1=CL2=50pF, (Figure 1) 18 30 ns tSKEW Differential output delay skew RL= 54Ω, CL1=CL2=50pF, (Figure 1) 0.5 2 ns tTLH tTHL Rise or fall differential time RL= 54Ω, CL1=CL2=50pF, (Figure 1) 8 12 ns tPZL Output enable time CL= 50pF, S1 Closed 30 ns tPZH Output enable time CL= 50pF, S2 Closed 30 ns tPHZ Output disable time CL= 15pF, S2 Closed 30 ns tPLZ Output disable time CL= 15pF, S1 Closed 30 ns tSK(EN) Synchronous driver operation a-b at enable 2ns tSK(DS) Synchronous driver operation A-B at disable 46 ns |
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