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MAX3098EBCPE Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX3098EBCPE Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 16 page ±15kV ESD-Protected, 32Mbps, 3V/5V, Triple RS-422/RS-485 Receivers with Fault Detection ______________________________________________________________________________________ 11 Common-Mode Range The MAX3097E/MAX3098E contain circuitry that de- tects if the input stage is going outside its useful com- mon-mode range. If the received data could be unreliable, a fault signal is triggered. Detecting Low Input Differential Due to cable attenuation on long wire runs, it is possi- ble that VID < 200mV, and incorrect data will be received. In this condition, a fault will be indicated. Delayed Fault Output The delayed fault output provides a programmable blanking delay to allow transient faults to occur without triggering an alarm. Such faults may occur with slow signals triggering the receiver alarm through the zero crossover region. Figure 9 shows the delayed alarm output. ALARMD performs a logic OR of ALARMA, ALARMB, and ALARMZ (Figure 10). A NOR gate drives an N- channel MOSFET so that in normal operation with no faults, the current source (10µA typ) is shunted to ground. Upon activation of any alarm from receiver A, B, or Z, the MOSFET is turned off, allowing the current source to charge CDELAY. When VDELAY exceeds the DELAY threshold, the comparator output, ALARMD, goes high. ALARMD is reset when all receiver alarms go low, quickly discharging CDELAY to ground. Setting Delay Time ALARMD’s delay time is set with a single capacitor connected from DELAY to GND. The delay comparator threshold varies with supply voltage, and the CDELAY value can be determined for a given time delay period from the Capacitance vs. ALARMD Output Delay graph in the Typical Operating Characteristics or using the following equations: tD = 15 + 0.33 x CDELAY (for VCC = 5V) and tD = 10 + 0.187 x CDELAY (for VCC = 3V) where tD is in µs and CDELAY is in pF. ALARMA ALARMB ALARMD tD tD ALARMA ALARMB ALARMZ ALARMD DELAY COMPARATOR NMOS DELAY CURRENT SOURCE CDELAY* (EXTERNAL) G1 DELAY THRESHOLD tDLY ALARM_ DELAY ALARMD *The capacitor (CDELAY) charges up slowly, but discharges rapidly. If the duration of an ALARM_ pulse is less than tDLY, no alarm output will be present at ALARMD. Figure 9. Delayed Alarm Output Figure 10. ALARMD Simplified Schematic Figure 8. Short-Circuit Detection A NORMAL OPERATION SHORT CIRCUIT A TO A A |
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