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MAX3183EEUK-T Datasheet(PDF) 5 Page - Maxim Integrated Products |
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MAX3183EEUK-T Datasheet(HTML) 5 Page - Maxim Integrated Products |
5 / 8 page Signal Invalid Detector If no valid signal levels appear on RIN for 30µs (typ), INVALID goes low. This event typically occurs if the RS-232 cable is disconnected, or if the connected peripheral transmitter is turned off. INVALID goes high when a valid level is applied to the RS-232 receiver input. Figure 2 shows the input levels and timing dia- gram for INVALID operation. Enable Input The MAX3180E/MAX3182E feature an enable input (EN). Drive EN high to force ROUT into a high-imped- ance state. In this state, the devices ignore incoming RS-232 signals. Pull EN low for normal operation. ESD Protection As with all Maxim devices, ESD protection structures are incorporated on all pins to protect against ESD encountered during handling and assembly. The receiver inputs of the MAX3180E–MAX3183E have extra protection against static electricity. Maxim’s engineers have developed state-of-the-art structures enabling these pins to withstand ESD up to ±15kV without dam- age or latchup. The receiver inputs of the MAX3180E– MAX3183E are characterized for protection to the fol- lowing limits: • ±15kV using the Human Body Model • ±8kV using the Contact Discharge method specified in IEC 1000-4-2 • ±15kV using the Air-Gap Discharge method speci- fied in IEC 1000-4-2 Human Body Model Figure 3 shows the Human Body Model, and Figure 4 shows the current waveform it generates when dis- charged into a low impedance. This model consists of a 100pF capacitor charged to the ESD voltage of inter- est, and then discharged into the test device through a 1.5k Ω resistor. ±15kV ESD-Protected, 0.5µA, +3V to +5.5V, 1.5Mbps RS-232 Receivers in SOT23-5 _______________________________________________________________________________________ 5 CHARGE-CURRENT LIMIT RESISTOR DISCHARGE RESISTANCE STORAGE CAPACITOR Cs 100pF RC 1M Ω RD 1500 Ω HIGH- VOLTAGE DC SOURCE DEVICE UNDER TEST Figure 3. Human Body ESD Test Model IP 100% 90% 36.8% tRI TIME tDL CURRENT WAVEFORM PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE) Ir 10% 0 0 AMPERES Figure 4. Human Body Model Current Waveform VALID SIGNALS INVALID SIGNALS VALID SIGNALS -2.7V -0.3V +2.7V +0.3V 0 INDETERMINATE INDETERMINATE 0 VCC tINVL INVALID REGION RECEIVER INPUT VOLTAGE (V) INVALID OUTPUT (V) tINVH Figure 2. Input Levels and INVALID Timing |
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