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MAX3233ECPP Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX3233ECPP Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 12 page By connecting FORCEON to INVALID, the device shuts down when no valid receiver level and no receiver or transmitter edge is detected for 30sec. It wakes up when a valid receiver level or receiver or transmitter edge is detected. By connecting FORCEON and FORCEOFF to INVALID, the device shuts down when no valid receiver level is detected and wakes up when a valid receiver level is detected. A system with AutoShutdown Plus may need time to wake up. Figure 4 shows a circuit that forces the transmitters on for 100ms, allowing enough time for another system to realize that the MAX3233E/ MAX3235E is awake. If another system outputs valid RS-232 signal transitions within that time, the RS-232 ports on both systems remain enabled. Software-Controlled Shutdown If direct software control is desired, use INVALID to indicate DTR or Ring Indicator signal. Tie FORCEOFF and FORCEON together to bypass the AutoShutdown Plus so the line acts like a SHDN input. ±15kV ESD Protection As with all Maxim devices, ESD-protection structures are incorporated on all pins to protect against electrostatic discharges encountered during handling and assembly. The driver outputs and receiver inputs have extra pro- tection against static electricity. Maxim’s engineers have developed state-of-the-art structures to protect these pins against ESD of ±15kV without damage. The ESD structures withstand high ESD in all states: normal operation, shutdown, and powered down. After an ESD ±15kV ESD-Protected, 1µA, 250kbps, 3.3V/5V, Dual RS-232 Transceivers with Internal Capacitors 8 _______________________________________________________________________________________ Table 2. INVALID Truth Table Low No High Yes INVALID OUTPUT RS-232 SIGNAL PRESENT AT ANY RECEIVER INPUT -2.7 -0.3 +2.7 +0.3 0 INDETERMINATE INVALID HIGH INVALID LOW INVALID HIGH INDETERMINATE Figure 3a. Receiver Positive/Negative Thresholds for INVALID VCC 0 V+ V- VCC 0 INVALID OUTPUT TRANSMITTER INPUTS RECEIVER INPUTS } INVALID REGION TRANSMITTER OUTPUTS tAUTOSHDN tWU tWU tINVL tINVH tAUTOSHDN Figure 3b. AutoShutdown Plus, INVALID, and READY Timing Diagram |
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