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MAX6733UTSDD3-T Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX6733UTSDD3-T Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 16 page Manual Reset Input Many µP-based products require manual reset capabil- ity, allowing the operator, a test technician, or external logic circuitry to initiate a reset. A logic low on MR asserts the reset output, clears the watchdog timer, and deasserts the watchdog output. Reset remains asserted while MR is low and for the reset timeout peri- od (tRP) after MR returns high. An internal 50k Ω pullup resistor allows MR to be left open if unused. Drive MR with TTL or CMOS-logic levels or with open-drain/col- lector outputs. Connect a normally open momentary switch from MR to GND to create a manual reset func- tion; external debounce circuitry is not required. Connect a 0.1µF capacitor from MR to GND to provide additional noise immunity when driving MR over long cables or if the device is used in a noisy environment. Adjustable Input Voltage (RSTIN) The MAX6734/MAX6735 provide an additional high- impedance comparator input with a 626mV threshold to monitor a third supply voltage. To monitor a voltage higher than 626mV, connect a resistive-divider to the circuit as shown in Figure 2 to establish an externally controlled threshold voltage, VEXT_TH. V = 626mV EXT_TH × + () RR R 12 2 Single-/Dual-/Triple-Voltage µP Supervisory Circuits with Independent Watchdog Output _______________________________________________________________________________________ 9 tRP tRP VTH VCC (MIN) VCC1, VCC2 RSTIN RST WDO MR Figure 1. RST, WDO, and MR Timing Diagram MAX6734 MAX6735 VEXT_TH GND RSTIN R1 R2 Figure 2. Monitoring a Third Voltage |
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