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MAX221ECUE Datasheet(PDF) 4 Page - Maxim Integrated Products |
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MAX221ECUE Datasheet(HTML) 4 Page - Maxim Integrated Products |
4 / 12 page ±15kV ESD-Protected, +5V, 1µA, Single RS-232 Transceiver with AutoShutdown 4 _______________________________________________________________________________________ 0 10 20 30 40 50 0 1000 2000 3000 4000 5000 SLEW RATE vs. LOAD CAPACITANCE LOAD CAPACITANCE (pF) +SLEW -SLEW NAME FUNCTION 1 EN Receiver Enable Control. Drive low for normal operation. Drive high to force the receiver output (ROUT) into a high-impedance state. 2 C1+ Positive Terminal of the Voltage Doubler Charge-Pump Capacitor PIN 3 V+ Positive Voltage Generated by the Charge Pump 4 C1- Negative Terminal of the Voltage Doubler Charge-Pump Capacitor 8 RIN RS-232 Receiver Input, ±15kV ESD protected 7 V- Negative Voltage Generated by the Charge Pump 6 C2- Negative Terminal of the Inverting Charge-Pump Capacitor 5 C2+ Positive Terminal of the Inverting Charge-Pump Capacitor 13 TOUT RS-232 Transmitter Output, ±15kV ESD Protected 12 FORCEON Drive high to override automatic circuitry, keeping transmitter and charge pump on. FORCEOFF must be high (Table 1). 11 TIN TTL/CMOS Transmitter Input 10 INVALID Output of the Invalid Signal Detector. INVALID is pulled low if no valid RS-232 level is present on the receiver input. 9 ROUT TTL/CMOS Receiver Output Pin Description 14 GND Ground 15 VCC +4.5V to +5.5V Supply Voltage 16 FORCEOFF Force-Off Input, active low. Drive low to shut down transmitter, receiver, and on-board charge pump. This overrides all automatic circuitry and FORCEON (Table 1). -10 -6 -8 -2 -4 2 0 4 8 6 10 0 1000 2000 3000 4000 5000 TRANSMITTER OUTPUT VOLTAGE vs. LOAD CAPACITANCE LOAD CAPACITANCE (pF) 250kbps 250kbps 120kbps 20kbps 20kbps 120kbps 0 10 20 30 40 50 0 1000 2000 3000 4000 5000 OPERATING SUPPLY CURRENT vs. LOAD CAPACITANCE LOAD CAPACITANCE (pF) 250kbps 20kbps 120kbps Typical Operating Characteristics (VCC = +5V, 250kbps data rate, 0.1µF capacitors, transmitter loaded with 3kΩ and CL, TA = +25°C, unless otherwise noted.) |
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