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MAX3248EEAI Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX3248EEAI Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 14 page +3.0V to +5.5V, 10nA, 250kbps RS-232 Transceivers with ±15kV ESD-Protected I/O and Logic Pins _______________________________________________________________________________________ 7 AutoShutdown Plus Mode A 10nA supply current is achieved with Maxim’s AutoShutdown Plus feature, which operates when FORCEOFF is low and FORCEON is high. When the MAX3238E/MAX3248E sense no valid signal transitions on all receiver and transmitter inputs for 30s, the on- board power supply and drivers are shut off, reducing supply current to 1µA. If the receiver inputs are in the invalid range (-0.3V < R_IN < +0.3V) and the transmit- ter inputs are at GND or VCC, supply current is further reduced to 10nA. This occurs if the RS-232 cable is disconnected or if the connected peripheral transmit- ters are turned off. The system turns on again when a valid transition is applied to any RS-232 receiver or transmitter input. As a result, the system saves power without changes to the existing BIOS or operating sys- tem. The INVALID output is high when the receivers are active. Since INVALID indicates the receiver inputs’ condition, it can be used in any mode (Figure 3). MAX3238E/ MAX3248E I/O CHIP WITH UART CPU RS-232 POWER MANAGEMENT UNIT OR KEYBOARD CONTROLLER FORCEOFF FORCEON INVALID T1 T2 T3 T4 T5 R1 R2 R3 Figure 1. Interface Under Control of PMU MAX3238E MAX3248E T1OUT R1OUTB Tx 5k Ω UART VCC T1IN THREE-STATED LOGIC TRANSITION DETECTOR R1IN PROTECTION DIODE R1OUT FORCEOFF = GND VCC TO µP Rx PREVIOUS RS-232 Tx UART SHDN = GND VCC VCC GND Rx 5k Ω a) OLDER RS-232: POWERED-DOWN UART DRAWS CURRENT FROM ACTIVE RECEIVER OUTPUT IN SHUTDOWN. b) NEW MAX3238E/MAX3248E: IN SHUTDOWN, R1OUTB IS USED TO MONITOR EXTERNAL DEVICES AND R1OUT IS THREE STATED, ELIMINATING A CURRENT PATH THROUGH THE UART'S PROTECTION DIODE. GND PROTECTION DIODE I I Figure 2. MAX3238E/MAX3248E detect RS-232 activity when the UART and interface are shut down. |
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