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MAX3225E Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX3225E Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 20 page munication software (such as LapLink™). Transmitters can be paralleled to drive multiple receivers. Figure 1 shows a complete system connection. When FORCEOFF is driven to ground or when the Auto- Shutdown Plus circuitry senses that all receiver and transmitter inputs are inactive for more than 30sec, the transmitters are disabled and the outputs go into a high- impedance state. When powered off or shut down, the outputs can be driven to ±12V. The transmitter inputs do not have pull-up resistors. Connect unused inputs to GND or VCC. RS-232 Receivers The receivers convert RS-232 signals to CMOS-logic output levels. The MAX3224E–MAX3227E feature inverting outputs that always remain active (Table 1). The MAX3244E/MAX3245E have inverting three-state ±15kV ESD-Protected, 1µA, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus 8 _______________________________________________________________________________________ MAX3244E MAX3245E I/O CHIP WITH UART CPU RS-232 POWER- MANAGEMENT UNIT OR KEYBOARD CONTROLLER FORCEOFF FORCEON INVALID Figure 1. Interface Under Control of PMU MAX3244E MAX3245E T1OUT R2OUTB Tx 5k UART VCC T1IN THREE-STATED LOGIC TRANSITION DETECTOR R2IN PROTECTION DIODE R2OUT FORCEOFF = GND VCC TO µP Rx PREVIOUS RS-232 Tx UART SHDN = GND VCC VCC GND Rx 5k a) OLDER RS-232: POWERED-DOWN UART DRAWS CURRENT FROM ACTIVE RECEIVER OUTPUT IN SHUTDOWN. b) NEW MAX3244E/MAX3245E: IN SHUTDOWN, R2OUTB IS USED TO MONITOR EXTERNAL DEVICES AND R2OUT IS THREE STATED, ELIMINATING A CURRENT PATH THROUGH THE UART'S PROTECTION DIODE. GND PROTECTION DIODE I I Figure 2. The MAX3244E/MAX3245E detect RS-232 activity when the UART and interface are shut down. |
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