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MAX3320A Datasheet(PDF) 5 Page - Maxim Integrated Products |
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MAX3320A Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 12 page 3V to 5.5V, up to 250kbps True RS-232 Transceiver with 4µA AutoShutdown Plus and Power-On Reset _______________________________________________________________________________________ 5 ______________________________________________________________Pin Description 300 0 10 100 1000 MAXIMUM TRANSIENT DURATION vs. RESET COMPARATOR OVERDRIVE 50 RESET COMPARATOR OVERDRIVE (mV) 100 200 150 250 NOT IN SHUTDOWN MODE SHUTDOWN MODE CBYPASS = 0.1µF 0.960 0.970 1.010 1.000 0.990 0.980 1.030 1.020 1.040 -40 0 -20 20 40 80 60 NORMALIZED POWER-UP RESET DELAY vs. TEMPERATURE TEMPERATURE (°C) ____________________________Typical Operating Characteristics (continued) (VCC = 3.3V, 250kbps data rate, C1–C4 = 0.1µF, all transmitters loaded with 3kΩ. Typical values are at TA = +25°C, unless otherwise noted.) 20 C1+ Positive terminal of voltage-doubler charge-pump capacitor 19 VCC +3V to +5.5V Supply Voltage 18 C1- Negative terminal of voltage-doubler charge-pump capacitor NAME FUNCTION 1 V+ 5.5V generated by the charge pump 2 C2+ Positive terminal of inverting charge-pump capacitor PIN 3 C2- Negative terminal of inverting charge-pump capacitor 4 V- -5.5V generated by the charge pump 10 RESET RESET Output. RESET remains low while VCC is below the reset threshold, and for 280ms (max) after VCC rises above the reset threshold. 9 INVALID Output of the Valid Signal Detector. Asserts when no valid RS-232 levels are present on any of the receiver inputs for 90µs. 7, 8 R_OUT TTL/CMOS Receiver Outputs (R1OUT and R2OUT) 5, 6 T_IN TTL/CMOS Transmitter Inputs (T1IN and T2IN) 17 GND Ground 15, 16 T_OUT RS-232 Transmitter Outputs (T2OUT and T1OUT) 13, 14 R_IN RS-232 Receiver Inputs (R2IN and R1IN) 12 FORCEON Force-On Input. Drive FORCEON high to override AutoShutdown Plus, keeping transmitters on (FORCEOFF must be high) (Table 1). 11 FORCEOFF Force-Off Input. Drive FORCEOFF low to shut down transmitters and on-board power supply. This overrides AutoShutdown Plus and FORCEON (Table 1). |
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