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MAX16122 Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX16122 Datasheet(HTML) 8 Page - Maxim Integrated Products |
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8 / 16 page  All reset outputs are either active-low open-drain or active-low push-pull (see the Selector Guide). RESET changes from high to low whenever the monitored voltage VCC drops below the reset threshold voltage. Once VCC exceeds its respective reset threshold voltage, RESET remains low for the reset timeout period (tRP) and then goes high. RESET is one-shot pulsed whenever selected manual reset inputs are asserted longer than the setup delay (tSU). RESET stays asserted for the normal reset timeout period. RESET is guaranteed to be in the proper output logic state for VCC ≥ 0.95V. For applications requir- ing valid reset logic when VCC is less than 0.95V, see the Ensuring a Valid RESET Output Down to VCC = 0V (Push-Pull RESET Output) section. Manual Reset Input Each device in the MAX16122–MAX16125 family includes at least one manual reset input, which must be held logic- low for an extended setup period (tSU) before the RESET output asserts. An internal pullup resistor is connected to each manual reset input. When valid manual reset input conditions/setup periods are met, the RESET output is pulsed low for the reset timeout period (see Table 2). Existing front-panel pushbutton switches (i.e., power- on/-off, channel up/down, or mode select) can be used to drive the manual reset inputs. The extended manual reset setup period prevents nuisance system resets dur- ing normal front-panel usage or resulting from inadvertent short-term pushbutton closure. The MAX16124/MAX16125 include a single manual reset input (MR) and two reset outputs (RESET and SRESET). The MAX16122/MAX16123 include two manual reset inputs (MR1 and MR2) and one reset output, RESET. For dual MR1 and MR2 devices, both inputs must be simulta- neously pulled low and held for the extended setup period (tSU) before the reset output is pulsed. The dual extended setup provides greater protection from nuisance resets. The MAX16122–MAX16125 RESET output is asserted once for the reset timeout period after each valid manual reset input condition. At least one manual reset input must be released (go high) and then be driven low for the extended setup period before RESET asserts again. Internal timing circuitry debounces low-to-high manual reset logic transitions, so no external circuitry is required. Figure 1a. Reset Timing Diagram tSU tDB tMRD tRP ONE-SHOT PULSE ON RESET MR RESET *SRESET (MR1 AND MR2) GND GND *SRESET IS FOR MAX16124/MAX16125 ( ) MR1 AND MR2 IS FOR MAX16122/MAX16123 GND MAX16122–MAX16125 Dual Pushbutton Controllers in Tiny 6-Bump WLP Package www.maximintegrated.com Maxim Integrated │ 8 |
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