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LTC2873 bảng dữ liệu(PDF) 4 Page - Analog Devices |
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LTC2873 bảng dữ liệu(HTML) 4 Page - Analog Devices |
4 / 32 page LTC2873 4 REV B For more information www.analog.com SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VOH Receiver Output High Voltage Output High, I(RO) = –3mA (Sourcing), 3V ≤ VL ≤ 5.5V l VL – 0.4 V Output High, I(RO) = –1mA (Sourcing), 1.7V ≤ VL < 3V l VL – 0.4 V Three-State (High Impedance) Output Current (RO) 0V ≤ RO ≤ VL, VL = 5.5V, RE485 = VL l 0 ±5 µA Short-Circuit Current (RO) 0V ≤ RO ≤ VL, VL = 5.5V l ±135 mA RTERM Terminating Resistor TE485 = 0V, VAB = 2V, VB = –7V, 0V, 10V (Figure 8) l 108 120 156 Ω RS232 Driver VOLD Output Low Voltage RL = 3kΩ, VEE ≤ –6V l –5 –5.5 VEE V VOHD Output High Voltage RL = 3kΩ, VDD ≥ 6.5V l 5 5.9 VDD V Output Short-Circuit Current Driver Output = 0V l ±25 ±90 mA RS232 Receiver Input Threshold Voltage l 0.6 1.5 2.5 V Input Hysteresis l 0.1 0.4 1.0 V Output Low Voltage I(RO) = 1mA (Sinking), 1.7V ≤ VL < 5.5V l 0.4 V Output High Voltage I(RO) = –1mA (Sourcing), 1.7V ≤ VL < 5.5V l VL – 0.4 V Input Resistance –15V ≤ B/RI ≤ 15V, 485/232 = 0V l 3 5 7 kΩ Output Short-Circuit Current VL = 5.5V, 0V ≤ RO ≤ VL l ±25 ±50 mA Logic Inputs Threshold Voltage l 0.4 0.75 • VL V Input Current l 0 ±5 µA ESD Interface Pins (A/DO, B/RI) Human Body Model to GND or VCC, Powered or Unpowered (Note 5) ±26 kV All Other Pins Human Body Model (Note 5) ±4 kV The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = VL = 3.3V, TE485 = VL, LB = 0V unless otherwise noted. (Notes 2, 6) ELECTRICAL CHARACTERISTICS |
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