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ST485ER Datasheet(PDF) 7 Page - STMicroelectronics |
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ST485ER Datasheet(HTML) 7 Page - STMicroelectronics |
7 / 19 page ST485ER Electrical characteristics 7/19 4.2 Driver switching characteristics VCC = 5V ± 5%, TA = TMIN to TMAX , unless otherwise specified. Typical values are referred to TA = 25°C ICC No load supply current (2) VRE = 0V or VCC VDE = VCC VDE = 0V 400 300 900 500 µA µA IOSD1 Driver short-circuit current, VO=High VO = -7 to 12V (3) 35 250 mA IOSD2 Driver short-circuit current, VO=Low VO = -7 to 12V (3) 35 250 mA IOSR Receiver short-circuit current VO = 0V to VCC 795 mA 1. All currents into device pins are positive; all cuttents out of device pins are negative; all voltages are referenced to device ground unless specified. 2. Supply current specification is valid for loaded transmitters when VDE = 0V 3. Applies to peak current. See typical Operating Characteristics. Table 6. DC Electrical characteristics Symbol Parameter Test conditions (1) Min. Typ. Max. Unit Table 7. Driver switching characteristics Symbol Parameter Test conditions (1) 1. All currents into device pins are positive; all cuttents out of device pins are negative; all voltages are referenced to device ground unless specified. Min. Typ. Max. Unit tPLH tPHL Propagation Delay Input to Output RDIFF = 54ΩCL1 = CL2 = 100pF (See Figure 4. and Figure 6.) 10 30 60 ns tSK Output Skew to Output RDIFF = 54ΩCL1 = CL2 = 100pF (See Figure 4. and Figure 6.) 510 ns tTLH tTHL Rise or Fall Time RDIFF = 54ΩCL1 = CL2 = 100pF (See Figure 4. and Figure 6.) 315 40 ns tPZH Output Enable Time CL = 100pFS2 = Closed (See Figure 5. and Figure 7.) 70 90 ns tPZL Output Enable Time CL = 100pFS1 = Closed (See Figure 5. and Figure 7.) 70 90 ns tPLZ Output Disable Time CL = 15pFS1 = Closed (See Figure 5. and Figure 7.) 70 90 ns tPHZ Output Disable Time CL = 15pFS2 = Closed (See Figure 5. and Figure 7.) 70 90 ns CAB Output AB Capacitance 43 pF |
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