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ST3243CTR 데이터시트(PDF) 7 Page - STMicroelectronics |
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7 / 20 page ST3243 Electrical characteristics 7/20 Table 6. Auto-powerdown electrical characteristics (C1 - C4 = 0.1µF, VCC = 3V to 5.5V, TA = -40 to 85°C, unless otherwise specified. Symbol Parameter Test Conditions Min. Typ. Max. Unit VRITE Receiver input threshold to transmitter enabled Positive threshold Negative threshold 2.7 2.7 V V VRITD Receiver input threshold to transmitter disabled 1 µA Supply Current -0.3 0.3 V VIOL INVALID Output voltage LOW 0.4 V VIOH INVALID Output voltage HIGH VCC-0.6 V tWU Receiver threshold to transmitter enabled IOUT = 1.6mA 250 ms tinvh Receiver positive or negative threshold to INVALID HIGH IOUT = -1mA 1 ms tinvL Receiver positive or negative threshold to INVALID LOW 30 ms Table 7. Transmitter electrical characteristics (C1 - C4 = 0.1µF, VCC = 3V to 5.5V, TA = -40 to 85°C, unless otherwise specified. Symbol Parameter Test Conditions Min. Typ. Max. Unit VTOUT Output voltage swing All transmitter outputs are loaded with 3K Ω to GND ± 5 ± 5.4 V ROUT Output Resistance VCC = V+ = V- = 0V, VOUT = ± 2V 300 10M Ω ISC Output short circuit current ± 35 ± 60 mA VOT Transmitter output voltage T1IN = T2IN = GND, T3IN = VCC T3OUT loaded with 3K Ω to GND T1OUT and T2OUT loaded with 2.5mA each ± 5V Table 8. Receiver electrical characteristics (C1 - C4 = 0.1µF, VCC = 3V to 5.5V, TA = -40 to 85°C, unless otherwise specified. Symbol Parameter Test Conditions Min. Typ. Max. Unit VRIN Receiver input voltage operating range -25 25 V VRIL RS-232 Input threshold low TA = 25°C, VCC = 3.3V TA = 25°C, VCC = 5.0V 0.6 0.8 1.2 1.2 V VRIH RS-232 Input threshold high TA = 25°C, VCC = 3.3V TA = 25°C, VCC = 5.0V 1.5 1.8 2.4 2.4 V VRIHYS Input hysteresis 0.5 V RRIN Input resistance TA = 25°C 3 5 7 K Ω |
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