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MAX3224ECTP+ Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX3224ECTP+ Datasheet(HTML) 10 Page - Maxim Integrated Products |
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10 / 21 page  ±15kV ESD-Protected, 1µA, 1Mbps 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus 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 outputs that are high impedance when shut down (FORCEOFF = GND) (Table 1). The MAX3244E/MAX3245E feature an extra, always active, noninverting output, R2OUTB. R2OUTB output monitors receiver activity while the other receivers are high impedance, allowing ring indicator applications to be monitored without forward biasing other devices connected to the receiver outputs. This is ideal for sys- tems where VCC is set to ground in shutdown to accommodate peripherals such as UARTs (Figure 2). The MAX3224E–MAX3227E/MAX3244E/MAX3245E fea- ture an INVALID output that is enabled low when no valid RS-232 voltage levels have been detected on all receiver inputs. Because INVALID indicates the receiv- er input’s condition, it is independent of FORCEON and FORCEOFF states (Figures 3 and 4). AutoShutdown Plus Mode The MAX3224E–MAX3227E/MAX3244E/MAX3245E achieve a 1µA supply current with Maxim’s AutoShutdown Plus feature, which operates when FORCEOFF is high and a FORCEON is low. When these devices do not sense a valid signal transition on any receiver and trans- mitter input for 30s, the on-board charge pumps are shut down, reducing supply current to 1µA. This occurs if the RS-232 cable is disconnected or if the connected Table 1. Output Control Truth Table OPERATION STATUS FORCEON FORCEOFF VALID RECEIVER LEVEL RECEIVER OR TRANSMITTER EDGE WITHIN 30s T_OUT R_OUT (MAX3224E/ MAX3225E/ MAX3226E/ MAX3227E) R_OUT (MAX3244E/ MAX3245E) R2OUTB (MAX3244E/ MAX3245E) Shutdown (Forced Off) X 0 X X High-Z Active High-Z Active Normal Operation (Forced On) 1 1 X X Active Active Active Active Normal Operation (AutoShutdown Plus) 0 1 X Yes Active Active Active Active Shutdown (Auto- Shutdown Plus) 0 1 X No High-Z Active Active Active Normal Operation INVALID* 1 Yes X Active Active Active Active Normal Operation INVALID* 1 X Yes Active Active Active Active Shutdown INVALID* 1 No No High-Z Active Active Active Normal Operation (AutoShutdown) INVALID* INVALID** Yes X Active Active Active Active Shutdown (AutoShutdown) INVALID* INVALID** No X High-Z Active High-Z Active X = Don’t care * INVALID connected to FORCEON ** INVALID connected to FORCEON and FORCEOFF 10 Maxim Integrated MAX3224E/MAX3225E/ MAX3226E/MAX3227E/MAX3244E/MAX3245E |
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