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MAX221ECAE Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX221ECAE Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 12 page ±15kV ESD-Protected, +5V, 1µA, Single RS-232 Transceiver with AutoShutdown 6 _______________________________________________________________________________________ 1 No Shutdown (AutoShutdown) High-Z 1 High-Z 0 1 1 1 OPERATION STATUS X 0 VALID RECEIVER EN X Shutdown (Forced Off) X Normal Operation (Forced On) X 0 Yes Normal Operation (AutoShutdown) No Yes 0 0 High-Z Active Active High-Z TOUT Active High-Z Active 0 FORCEOFF 1 0 1 1 1 1 High-Z High-Z Active Active ROUT High-Z Active Active X FORCEON 1 X 1 0 0 0 RS-232 SIGNAL PRESENT AT RECEIVER INPUT INVALID OUTPUT Yes High No Low Table 1. Output Control Truth Table Table 2. INVALID Truth Table Figure 2c. AutoShutdown Logic +0.3V -0.3V INVALID TO MAX221E POWER SUPPLY AND TRANSMITTER RIN * TRANSMITTER IS DISABLED, REDUCING SUPPLY CURRENT TO 1 µA IF RECEIVER INPUT IS BETWEEN +0.3V AND -0.3V FOR AT LEAST 30 µs. 30µs COUNTER R +2.7V -2.7V INVALID TO MAX221E POWER SUPPLY RIN * TRANSMITTER IS ENABLED IF: RECEIVER INPUT IS GREATER THAN +2.7V OR LESS THAN -2.7V. RECEIVER INPUT HAS BEEN BETWEEN +0.3V AND -0.3V FOR LESS THAN 30 µs. 30µs COUNTER R FORCEOFF POWER DOWN INVALID FORCEON INVALID IS AN INTERNALLY GENERATED SIGNAL USED BY AUTOSHUTDOWN LOGIC AND APPEARS AS AN OUTPUT. POWER DOWN IS ONLY AN INTERNAL SIGNAL. IT CONTROLS THE OPERATIONAL STATUS OF THE TRANSMITTER AND POWER SUPPLIES. Figure 2b. Transmitter Enabled Using AutoShutdown Figure 2a. Entering 1µA Supply Mode via AutoShutdown x = Don’t care |
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