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MAX3224ETP+ Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX3224ETP+ Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 19 page peripheral transmitters are turned off, and the UART dri- ving the transmitter inputs is inactive. The system turns on again when a valid transition is applied to any RS-232 receiver or transmitter input. As a result, the sys- tem saves power without changes to the existing BIOS or operating system. 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 6). 1µA Supply Current, 1Mbps, 3.0V to 5.5V, RS-232 Transceivers with AutoShutdown Plus +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. 30 μs 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. 30 μs 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 10 Maxim Integrated MAX3224–MAX3227/MAX3244/MAX3245 |
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