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MAX3227 Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX3227 Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 20 page Figures 3a and 3b depict valid and invalid RS-232 receiver voltage levels. INVALID indicates the receiver input’s condition, and is independent of FORCEON and FORCEOFF states. Figure 3 and Tables 1 and 2 sum- marize the operating modes of the MAX3224– MAX3227/MAX3244/MAX3245 devices. FORCEON and FORCEOFF override AutoShutdown Plus circuitry. When neither control is asserted, the IC selects between these states automatically based on the last receiver or transmitter input edge received. When shut down, the device’s charge pumps turn off, V+ is pulled to VCC, V- is pulled to ground, the transmit- ter outputs are high impedance, and READY (MAX3224–MAX3227) is driven low. The time required to exit shutdown is typically 100µs (Figure 8). By connecting FORCEON to INVALID, the MAX3224– MAX3227/MAX3244/MAX3245 shut down when no valid receiver level and no receiver or transmitter edge is detected for 30sec, and wake up when a valid receiver level or receiver or transmitter edge is detected. By connecting FORCEON and FORCEOFF to INVALID, the MAX3224–MAX3227/MAX3244/MAX3245 shutdown when no valid receiver level is detected and wake up 1µA Supply Current, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus 10 ______________________________________________________________________________________ +0.3V -0.3V INVALID R_IN INVALID ASSERTED IF ALL RECEIVER INPUTS ARE BETWEEN +0.3V AND -0.3V FOR AT LEAST 30 µs. 30µs TIMER R +2.7V -2.7V INVALID R_IN INVALID DEASSERTED IF ANY RECEIVER INPUT HAS BEEN BETWEEN +2.7V AND -2.7V FOR LESS THAN 30 µs. 30µs TIMER R AUTOSHDN R_IN T_IN R S 30sec TIMER EDGE DETECT EDGE DETECT FORCEOFF FORCEON Figure 3a. INVALID Functional Diagram, INVALID Low Figure 3b. INVALID Functional Diagram, INVALID High Figure 3c. AutoShutdown Plus Logic POWERDOWN* AUTOSHDN FORCEOFF FORCEON * POWERDOWN IS ONLY AN INTERNAL SIGNAL. IT CONTROLS THE OPERATIONAL STATUS OF THE TRANSMITTERS AND THE POWER SUPPLIES. Figure 3d. Power-Down Logic -2.7V -0.3V +2.7V +0.3V 0 INDETERMINATE INVALID HIGH INVALID LOW INVALID HIGH INDETERMINATE Figure 4a. Receiver Positive/Negative Thresholds for INVALID RS-232 SIGNAL PRESENT AT ANY RECEIVER INPUT INVALID OUTPUT Yes High No Low Table 2. INVALID Truth Table |
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