Low-Power uP Reset Circuits - Maxim Integrated Products
Description
www.
datasheet4u.
com 19-1839; Rev 1; 04/01
SC70, Single/Dual Low-Voltage, Low-Power µP Reset Circuits
General Description
The MAX6381–MAX6390 microprocessor (µP) supervisory circuits monitor power supply voltages from +1.
8V to +5.
0V while consuming only 3µA of supply current at +1.
8V.
Whenever VCC falls below the factory-set reset thresholds, the reset output asserts and remains asserted for a minimum reset timeout period after VCC rises above the reset threshold.
Reset thresholds are available from +1.
58V to +4.
63V, in approximately 100mV increments.
Seven minimum reset timeout delays ranging from 1ms to 1200ms are available.
The MAX6381/MAX6384/MAX6387 have a push-pull active-low reset output.
The MAX6382/MAX6385/ MAX6388 have a push-pull active-high reset output, and the MAX6383/MAX6386/MAX6389/MAX6390 have an open-drain active-low reset output.
The MAX6384/MAX6385/MAX6386 also feature a debounced manual reset input (with internal pullup resistor).
The MAX6387/MAX6388/MAX6389 have an auxiliary input for monitoring a second voltage.
The MAX6390 offers a manual reset input with a longer VCC reset timeout period (1120ms or 1200ms) and a shorter manual reset timeout (140ms or 150ms).
The MAX6381/MAX6382/MAX6383 are available in 3-pin SC70 packages and the MAX6384–MAX6390 are available in 4-pin SC70 packages.
Features
o Factory-Set Reset Threshold Voltages Ranging from +1.
58V to +4.
63V in Approximately 100mV Increments o ±2.
5% Reset Threshold Accuracy Over Temperature (-40°C to +125°C) o Seven Reset Timeout Periods Available: 1ms, 20ms, 140ms, 280ms, 560ms, 1120ms, 1200ms (min) o 3 Reset Output Options Active-Low Push-Pull Active-High Push-Pull Active-Low Open-Drain o Reset Output State Guaranteed Valid Down to VCC = 1V o Manual Reset Input (MAX6384/MAX6385/MAX6386) o Auxiliary RESET IN (MAX6387/MAX6388/MAX6389) o VCC Reset Timeout (1120ms or 1200ms)/Manual Reset Timeout (140ms or 150ms) (MAX6390) o Negative-Going VCC Transient Immunity o Low Power Consumption of 6µA...
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