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MAX6833FXRD0 Datasheet(PDF) 6 Page - Maxim Integrated Products |
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MAX6833FXRD0 Datasheet(HTML) 6 Page - Maxim Integrated Products |
6 / 11 page Detailed Description Reset Output A microprocessor’s (µP’s) reset input starts the µP in a known state. The MAX6832–MAX6840 assert a reset to prevent code-execution errors during power-up, power- down, or brownout conditions. They also assert a reset signal whenever the VCC supply voltage falls below a preset threshold (MAX6832–MAX6837) or RESET-IN falls below the adjustable threshold (MAX6838/ MAX6839/MAX6840), keeping reset asserted for a fixed timeout delay (Table 2) after VCC or RESET-IN has risen above the reset threshold. The MAX6832/MAX6835/ MAX6838 use a push-pull active-low output, the MAX6833/MAX6836/MAX6839 have a push-pull active- high output, and the MAX6834/MAX6837/MAX6840 have an open-drain active-low output stage. Connect a pullup resistor on the MAX6834/MAX6837/MAX6840’s RESET output to any supply between 0 and 6V. Manual Reset Input Many µP-based systems require manual reset capabili- ty, allowing the operator, a test technician, or external logic circuitry to initiate a reset. Reset remains asserted while MR is low, and for a fixed timeout delay after MR returns high. This input has an internal 20k Ω pullup resistor, so it can be left open if it is not used. MR can be driven with CMOS logic level, or with open-drain/col- lector outputs. To create a manual reset function, con- nect a normally open momentary switch from MR to ground; external debounce circuitry is not required. If MR is driven from long cables or if the device is used in a noisy environment, connecting a 0.1µF capacitor from MR to ground provides additional noise immunity. RESET-IN Information The MAX6838/MAX6839/MAX6840 feature a RESET-IN input for monitoring supply voltages down to 0.44V. An external resistive-divider network can be used to set voltage monitoring thresholds as shown in Figure 1. As the monitored voltage falls, the voltage at RESET-IN decreases and asserts a reset when it falls below the RESET-IN threshold (VRSTIN). The low-leakage current Ultra-Low-Voltage SC70 Voltage Detectors and µP Reset Circuits 6 _______________________________________________________________________________________ MAX6838/ MAX6839/ MAX6840 RESET TIMEOUT PERIOD RESET OUTPUT VREF = 444mV RESET-IN RESET/ RESET GND VCC VCC MAX6832– MAX6837 RESET TIMEOUT PERIOD MANUAL RESET DETECT RESET OUTPUT VREF = 444mV RESET/ RESET GND MR (MAX6835/MAX6836/MAX6837 ONLY) MR PULLUP Functional Diagrams VMONITORED R1 R2 RESET-IN GND RESET (RESET) VCC ( ) ARE FOR MAX6839 MAX6838/ MAX6839/ MAX6840 R1 = R2 [(VMONITORED/VREF) -1] WHERE VMONITORED IS THE DESIRED TRIP LEVEL, VREF = 444mV Figure 1. Setting the Adjustable Threshold Externally |
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