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MAX3317EEAP Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX3317EEAP Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 16 page ±15kV ESD-Protected, 2.5V, 1µA, 460kbps, RS-232 Compatible Transceivers 10 ______________________________________________________________________________________ By connecting FORCEON to INVALID, the MAX3318E/ MAX3319E shut down when no valid receiver level is detected and wake up when a valid receiver level is detected. A system with AutoShutdown Plus may need time to wake up. Figure 5 shows a circuit that forces the trans- mitters on for 100ms, allowing enough time for the other system to realize that the MAX3318E/MAX3319E is awake. If the other system outputs valid RS-232 signal transitions within that time, the RS-232 ports on both systems remain enabled. Connecting to the PC (MAX3318E/MAX3319E) If direct software control is desired, use INVALID to indicate DTR or ring indicator (RI) signal. This can be used to connect a hand-held device to a PC. One example is using the Hot Sync™ function on a personal digital assistant (PDA). The transmitter and receiver signals (T_OUT and R_IN) are used for communication, while INVALID causes a change of state on RI. The change of state on RI will trigger an interrupt on the PC and allow communication to begin between the device and the PC. This eliminates the need for the PC to poll constantly the receiver or transmitter lines to determine if the device is connected. ±15kV ESD Protection All the pins on the MAX3316E–MAX3319E are protect- ed against ESDs encountered during handling and assembly. The driver outputs and receiver inputs have extra protection against static electricity. Maxim’s engi- neers have developed state-of-the-art structures to pro- tect 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 event, Maxim’s E versions keep working without latchup, whereas competing products can latch and must be powered down to remove latchup. ESD protection can be tested in various ways; the trans- mitter outputs and receiver inputs of the product family are characterized for protection to the following limits: • ±15kV using the Human Body Model • ±8kV using the IEC 1000-4-2 Contact Discharge method • ±15kV using IEC 1000-4-2 Air-Gap method ESD Test Conditions ESD performance depends on a variety of conditions. Contact Maxim for a reliability report that documents test setup, test methodology, and test results. Human Body Model Figure 6a shows the Human Body Model, and Figure 6b shows the current waveform it generates when dis- charged into low impedance. This model consists of a 100pF capacitor charged to the ESD voltage of interest, which is then discharged into the test device through a 1.5k Ω resistor. +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 Figure 3a. INVALID Functional Diagram, INVALID Low +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 Figure 3b. INVALID Functional Diagram, INVALID High -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 Hot Sync is a trademark of 3Com. |
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