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ST485ABDR Scheda tecnica(PDF) 7 Page - STMicroelectronics |
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ST485ABDR Scheda tecnica(HTML) 7 Page - STMicroelectronics |
7 / 19 page ST485AB Electrical characteristics 7/19 Table 9. Receiver electrical characteristics (VCC = 4.5 V to 5.5 V, TA = -40 to 85°C, unless otherwise specified. Typical values are referred to TA = 25°C, VCC = 5 V) (Note: 1) Symbol Parameter Test conditions Min. Typ. Max. Unit VTH Receiver Differential Threshold Voltage VCM = -7 V to 12 V -0.2 0.2 V ΔVTH Receiver Input Hysteresis VCM = 0 V 70 mV VOH Receiver Output High Voltage IOUT = -4 mA, VID = 200 mV 3.5 4.7 V VOL Receiver Output Low Voltage IOUT = 4 mA, VID = -200 mV 0.2 0.4 V IOZR 3-State (High Impedance) Output Current at Receiver VO = 0.4 V to 2.4 V ± 1 μA RRIN Receiver Input Resistance VCM = -7 V to 12 V 12 24 K Ω IOSR Receiver Short-Circuit Current VO = 0 V to VCC 795 mA Table 10. Driver switching characteristics (VCC = 4.5 V to 5.5 V, TA = -40 to 85°C, unless otherwise specified. Typical values are referred to TA = 25°C, VCC = 5 V) (See Note: 1, Note 3) 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= 54 Ω, CL1=CL2=50 pF, (Figure 8.) 18 30 ns tSKEW Differential output delay skew RL= 54Ω, CL1=CL2=50 pF, (Figure 6.) 0.5 2 ns tTLH tTHL Rise or fall differential time RL= 54Ω, CL1=CL2=50 pF, (Figure 6.) 812 ns tPZL Output enable time CL= 50 pF, S1 Closed 30 ns tPZH Output enable time CL= 50 pF, S2 Closed 30 ns tPHZ Output disable time CL= 15 pF, S2 Closed 30 ns tPLZ Output disable time CL= 15 pF, 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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