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MAX3223EEPP+ Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX3223EEPP+ Datasheet(HTML) 9 Page - Maxim Integrated Products |
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9 / 19 page  ±15kV ESD-Protected, 1µA, 3.0V to 5.5V, 250kbps, RS-232 Transceivers with AutoShutdown Table 1. Output Control Truth Table +0.3V -0.3V INVALID TO MAX32_ _E POWER SUPPLY AND TRANSMITTERS R_IN * TRANSMITTERS ARE DISABLED, REDUCING SUPPLY CURRENT TO 1 µA IF ALL RECEIVER INPUTS ARE BETWEEN +0.3V AND -0.3V FOR AT LEAST 30 µs. 30 µs COUNTER R Figure 3a. MAX32_ _E Entering 1µA Supply Mode via AutoShutdown +2.7V -2.7V INVALID TO MAX32_ _E POWER SUPPLY R_IN *TRANSMITTERS ARE ENABLED IF: ANY RECEIVER INPUT IS GREATER THAN +2.7V OR LESS THAN -2.7V. ANY RECEIVER INPUT HAS BEEN BETWEEN +0.3V AND -0.3V FOR LESS THAN 30 µs. 30 µs COUNTER R Figure 3b. MAX32_ _E with Transmitters Enabled Using AutoShutdown X = Don’t Care A mouse or other system with AutoShutdown may need time to wake up. Figure 4 shows a circuit that forces the transmitters on for 100ms, allowing enough time for the other system to realize that the MAX3221E/ MAX3223E/ MAX3243E are awake. If the other system transmits valid RS-232 signals within that time, the RS- 232 ports on both systems remain enabled. When shut down, the device’s charge pumps are off, V+ is pulled to VCC, V- is pulled to ground, and the transmitter outputs are high impedance. The time required to exit shutdown is typically 100µs (Figure 5b). Software-Controlled Shutdown If direct software control is desired, INVALID can be used to indicate DTR or Ring Indicator signal. Connect FORCEOFF and FORCEON together to disable Auto- Shutdown so the line acts like a SHDN input. ±15kV ESD Protection As with all Maxim devices, ESD-protection structures are incorporated on all pins to protect against electrostatic discharges encountered during handling and assembly. The driver outputs and receiver inputs of the MAX3221E/MAX3223E/MAX3243E have extra protection against static electricity. Maxim’s engineers have devel- oped state-of-the-art structures to protect these pins against ESD of ±15kV without damage. The ESD struc- tures withstand high ESD in all states: normal operation, shutdown, and powered down. After an ESD event, Maxim’s E versions keep working without latchup, whereas competing RS-232 products can latch and must be powered down to remove latchup. See Table 4. 0 0 0 1 X 1 FORCEON X Active Active Active R2OUTB (MAX3243E) Active Active Active Active Active Active High-Z R_OUT (MAX3221E/ MAX3223E) Active Active High-Z High-Z 1 1 1 1 0 1 FORCEOFF 0 Active High-Z Active T_OUT High-Z Active Active High-Z Active Active Active R_OUT (MAX3243E) High-Z Active Active High-Z 0 0 Yes No Normal Operation (AutoShutdown) Yes 0 X Normal Operation (Forced On) X Shutdown (Forced Off) X EN (MAX3221E/ MAX3223E) VALID RECEIVER LEVEL 0 X OPERATION STATUS 1 1 1 0 Active High-Z 1 High-Z Active Shutdown (AutoShutdown) No 1 Maxim Integrated 9 MAX3221E/MAX3223E/MAX3243E |
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