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ST485ABDR 数据表(PDF) 6 Page - STMicroelectronics |
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ST485ABDR 数据表(HTML) 6 Page - STMicroelectronics |
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6 / 19 page ![]() Electrical characteristics ST485A 6/19 4 Electrical characteristics (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) 4.1 Logic input (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) 4.2 Transmitter (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) Table 5. DC Electrical characteristics Symbol Parameter Test conditions Min Typ Max Unit ISUPPLY VCC Power supply current No load, VRE=0V or VCC VDE = VCC 2.3 5 mA VDE = 0V 2.6 5 mA CI/O Input/output capacitance 10 pF CAB Driver output capacity 10 pF Table 6. Logic input electrical characteristics Symbol Parameter Test conditions Min Typ Max Unit VIL Input logic threshold low DE, DI, RE 0.8 V VIH Input logic threshold high DE, DI, RE 2 V IIN1 Logic input current DE, DI, RE ± 2.0 µA IIN2 Input current (A, B) VDE=0V, VCC= 0 or 5.25V VIN=12V 1 mA VIN=-7V -0.8 mA Table 7. Transmitter electrical characteristics Symbol Parameter Test conditions Min Typ Max Unit VOD1 Differential driver output (No load) 5 V VOD2 Differential driver output (with load) RL= 54Ω (RS-422) VCM= -7V to 12V 1.5 2.7 5 V ∆V OD Change in magnitude of driver differential output voltage for complementary output states (Note: 1) RL= 27Ω or 50Ω 00.2 V VOC Driver common mode output voltage RL= 27Ω or 50Ω 13 V ∆V OC Change in magnitude of driver common mode output voltage (Note: 1) RL= 54Ω or 100Ω 00.2 V IOSD Driver short circuit output current VO= -7V to 12V ± 250 mA |
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