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MAX3227EAE Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX3227EAE Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 19 page RS-232 Transmitters The transmitters are inverting level translators that convert CMOS-logic levels to 5.0V EIA/TIA-232 levels. The MAX3224/MAX3226/MAX3244 guarantee a 250kbps data rate (1Mbps for the MAX3225/MAX3227/ MAX3245) with worst-case loads of 3k Ω in parallel with 1000pF, providing compatibility with PC-to-PC com- 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. 1µA Supply Current, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus MAX3244 MAX3245 I/O CHIP WITH UART CPU RS-232 POWER- MANAGEMENT UNIT OR KEYBOARD CONTROLLER FORCEOFF FORCEON INVALID Figure 1. Interface Under Control of PMU MAX3244 MAX3245 T1OUT R2OUTB Tx 5k Ω 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 Ω a) OLDER RS-232: POWERED-DOWN UART DRAWS CURRENT FROM ACTIVE RECEIVER OUTPUT IN SHUTDOWN. b) NEW MAX3244/MAX3245: 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 MAX3244/MAX3245 detect RS-232 activity when the UART and interface are shut down. LapLink is a registered trademark of Laplink Software, Inc. 8 Maxim Integrated MAX3224–MAX3227/MAX3244/MAX3245 |
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