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MAX824YEUK Datasheet(PDF) 10 Page - Micrel Semiconductor |
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MAX824YEUK Datasheet(HTML) 10 Page - Micrel Semiconductor |
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10 / 14 page  Micrel, Inc. MAX823/4/5 January 14, 2014 10 Revision 1.0 Functional Description Design and Product Advantages The MAX823/4/5 is series of a voltage supervisor reset IC with a manual reset input, watchdog input, and dual reset outputs. The MAX823/4/5 asserts and holds a reset when the supply voltage falls below the factory- programmed threshold voltage, when /MR is at low logic level, or when watchdog input times out. Reset is asserted for a fixed reset timeout period after the supply voltage increases above the rising threshold voltage or when the manual reset input is asserted high. The MAX823/4/5 features an active-low, push-pull reset output (/RESET) and an active-high, push-pull reset output (RESET). It also contains 52k Ω pull-up resistors on the /MR input to make it easy to connect to pushbutton inputs. The MAX823/4 also features a watchdog input (WDI). Manual Reset Input (/MR) The /MR input pin has integrated pull-up resistors to keep the current consumption low when the pushbutton switch is pressed. Reset Outputs (/RESET and RESET) There are two reset outputs: /RESET and RESET. Both outputs are push-pull, which eliminates the need for pull- up resistors. The RESET output is the inverse of the /RESET output. Asserting /RESET and RESET Outputs When Functioning as a Manual Reset The reset outputs /RESET and RESET are asserted while the /MR pin is driven low. Both reset outputs remain asserted for a factory-programmed reset timeout delay time, tRP. The typical value of a reset timeout period is 200ms. The /RESET pin is driven low while the RESET pin is driven high whenever /MR is pulled low. Figure 1. Manual Reset Function When Functioning as a Voltage Supervisor The /RESET pin is asserted whenever VCC falls below the reset threshold voltage, VRST (VCC < VRST). The VCC pin circuitry includes hysteresis to prevent /RESET or RESET pin chattering due to noise. The /RESET pin remains asserted for the duration of the reset timeout delay (tRP) after VCC has risen above the reset threshold voltage plus the hysteresis. The reset function ensures that a microprocessor is properly reset and powers up in a known condition after a power failure. The /RESET remains valid with VCC as low as 1V. The RESET output is a complement of the /RESET output. Figure 2. Voltage Supervisor Function |
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