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MIC1232 Dataheets PDF



Part Number MIC1232
Manufacturers Micrel Semiconductor
Logo Micrel Semiconductor
Description 5V Voltage Supervisor
Datasheet MIC1232 DatasheetMIC1232 Datasheet (PDF)

MIC1232 5V Voltage Supervisor with Manual Reset, Watchdog Timer and Dual Reset Outputs General Description The MIC1232 is a low-current microprocessor supervisor for monitoring 5V systems. The device features logic selectable (TOL) reset thresholds of 5% or 10% of 5V; a pushbutton reset input (/PBRST); 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 activehigh push.

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MIC1232 5V Voltage Supervisor with Manual Reset, Watchdog Timer and Dual Reset Outputs General Description The MIC1232 is a low-current microprocessor supervisor for monitoring 5V systems. The device features logic selectable (TOL) reset thresholds of 5% or 10% of 5V; a pushbutton reset input (/PBRST); 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 activehigh push-pull reset (RST) outputs. The /RST output maintains a valid reset condition for VCC as low as 1.4V. The MIC1232 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 or after the supply voltage increases above the reset threshold voltage. The MIC1232 is a drop-in replacement for the DS1232, MAX1232, and TC1232. It consumes a low 18µA (typ) of supply current, 40µA (max). This is one-tenth the max current of the DS1232, and one-quarter the max current of the MAX1232 and TC1232. It operates over the –40C to +85C temperature range and is available in the 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. Features • Low-current version of DS1232/MAX1232/TC1232/CAT1232 • Low current: 18µA (typ), 40µA (max) • Selectable threshold (TOL): 5% or 10% of 5V • Selectable watchdog timer (TD): 150ms, 600ms, 1.2s • Power OK/Reset time delay: 250ms (min) • Debounced pushbutton reset input (/PBRST) • Dual complementary reset outputs – Active-low, open-drain reset output – 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 MIC1832/DS1832/CAT1832 Applications • Automotive systems • Intelligent systems • Critical microprocessor power monitoring • Battery powered computers • Controllers _________________________________________________________________________________________________________________________ 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 February 2013 M9999-020413 Micrel, Inc. Ordering Information Part Number MIC1232NY MIC1232MY Temperature Range –40° to +85°C –40° to +85°C Package 8-Pin PDIP 8-Pin SOIC Pin Configuration Lead Finish Pb-Free Pb-Free MIC1232 8-Pin PDIP 8-Pin SOIC Pin Description Pin Number Pin Name 1 /PBRST 2 TD 3 TOL 4 GND 5 RST 6 /RST 7 /ST 8 VCC Pin Function Pushbutton Reset input: This input is debounced and can be driven with external logic signals or by using a mechanical pushbutton to actively force a reset. All pulses less than 1ms in duration on the /PBRST pin are ignored; any pulse with a duration of 20ms or greater is guaranteed to cause a reset. Time Delay input: This input selects the timebase used by the watchdog timer. When TD = 0V, the watchdog timeout period is set to a normal value of 150ms. When TD = open, the watchdog timeout period is set to a nominal value of 600ms. When TD = VCC, the watchdog period is 1.2s nominally. Tolerance Select input: This input selects whether 5% or 10% of VCC is used as the reset threshold voltage. When TOL = 0V, the 5% tolerance level is selected and when TOL = VCC, a 10% tolerance level is selected. IC ground pin, 0V reference. RST is asserted high if either VCC goes below the reset threshold, the watchdog times out, or /PBRST is pulled low for a minimum of 20ms. RST remains asserted for one reset timeout period after VCC exceeds the reset threshold, after the watch times out, or after /PBRST goes high. /RST is asserted low if either VCC goes below the reset threshold, the watchdog times out, or /PBRST is pulled low for a minimum of 20ms. /RST remains asserted for one reset timeout period after VCC exceeds the reset threshold, after the watch times out, or after /PBRST goes high. Opendrain output. Input to watchdog timer. If /ST does not see a transition from high to low within the watchdog timeout period, RST and /RST will be asserted. Primary supply input, +5V. February 2013 2 M9999-020413 Micrel, Inc. MIC1232 Absolute Maximum Ratings(1) Terminal Voltage VCC ......................................................... −0.3V to +6.0V All other inputs ............................. −0.3V to (VCC + 0.3V) Input Current VCC ......................................................................250mA GND, all other inputs ............................................25mA Lead Temperature (soldering, 10sec.) ....................... 300°C Storage Temperature (Ts)........................... −65°C to 150°C ESD Rating(3).......................................................see No.


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