MIC1832
3.3V Voltage Supervisor with Manual Reset,
Watchdog Timer and Dual Reset Outputs
General Description
Features
The MIC1832 is a low-current microprocessor supervisor
for monitoring 3.3V and 3V systems. The device features
logic-selectable (TOL) reset thresholds of 10% or 20% of
3.3V; a pushbutton reset input; a watchdog timer with
three-state selectable (TD) timeout periods of 150ms,
600ms, or 1.2s; a fixed reset timeout period of 250ms
(min); and active-low open-drain reset (/RST) and active-
high push-pull reset (RST) outputs. The /RST output
maintains a valid reset condition for VCC as low as 1.4V.
• Low-current version of DS1832
• Low current: 15µA (typ), 25µA (max)
• Selectable threshold (TOL): 10% or 20% of 3.3V
• Selectable watchdog timer (TD): 150ms, 600ms, 1.2s
• Power OK/Reset time delay: 250ms (min)
• Debounced pushbutton reset input
• Dual complementary reset outputs
o Active-low, open-drain reset output
The MIC1832 asserts a reset condition if the supply
voltage drops below the reset threshold, the pushbutton
reset is asserted low, or the watchdog timer does not see
a high-to-low transition on the watchdog timer input within
the watchdog timer period. A reset condition is held for the
reset timeout period of 250ms (min) after the pushbutton
input is released, after the supply voltage increases above
the reset threshold voltage, or after the watchdog has
initiated a reset.
o Active-high, push-pull reset output
• Available in Pb-Free 8-pin SOIC and PDIP packages
• –40°C to +85°C temperature range
• Pin-for-Pin compatible with MIC1232/DS1232/CAT1232
Applications
• Automotive systems
• Intelligent systems
• Critical microprocessor power monitoring
• Battery powered computers
• Controllers
The MIC1832 is a drop-in replacement for the DS1832. It
operates over the –40°C to +85°C temperature range and
is available in Pb-Free 8-pin SOIC and PDIP packages.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
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Typical Application
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
M9999-020413
February 2013