Click here for production status of specific part numbers. MAX6323/MAX6324 P Supervisory Circuits with Windowed (Min/Max) Watchdog and Manual Reset General Description Features The MAX6323/MAX6324 microprocessor (P) supervi- Min/Max (Windowed) Watchdog, sory circuits monitor power supplies and P activity in 8 Factory-Trimmed Timing Options digital systems. A watchdog timer looks for activity out- Pulsed Open-Drain, Active-Low Watchdog Output side an expected window of operation. Six laser-trimmed Power-On Reset reset thresholds are available with 2.5% accuracy from Precision Monitoring of +2.5V, +3.0V, +3.3V, +2.32V to +4.63V. Valid RESET output is guaranteed and +5.0V Power Supplies down to V = +1.2V. CC Open-Drain or Push-Pull RESET Outputs The RESET output is either push-pull (MAX6323) or Low-Power Operation (23A typ) open-drain (MAX6324). RESET is asserted low when Debounced Manual Reset Input V falls below the reset threshold, or when the manual CC Guaranteed Reset Valid to V = +1.2V CC reset input (MR) is asserted low. RESET remains assert- AEC-Q100 Qualified MAX6324HUT44/V+T ed for at least 100ms after V rises above the reset CC threshold and MR is deasserted. Ordering Information The watchdog pulse output (WDPO) utilizes an open- TEMP PIN- RESET PART drain configuration. It can be triggered either by a fast RANGE PACKAGE OUTPUT timeout fault (watchdog input pulses are too close to each MAX6323 UT -T -40C to +125C 6 SOT23 Push-Pull other) or a slow timeout fault (no watchdog input pulse is Ordering Information continued at end of data sheet. observed within the timeout period). The watchdog time- out is measured from the last falling edge of watchdog *These devices are factory trimmed to one of eight watchdog- input (WDI) with a minimum pulse width of 300ns. WDPO timeout windows and one of six reset voltage thresholds. Insert the letter corresponding to the desired watchdog-timeout window is asserted for 1ms when a fault is observed. Eight laser- (A, B, C, D, E, F, G, or H) into the blank following the number trimmed timeout periods are available. 6323 or 6324 (see Watchdog Timeout table). Insert the two- The MAX6323/MAX6324 are offered in a 6-pin SOT23 digit code (46, 44, 31, 29, 26, or 23) after the letters UT for the package and operate over the extended temperature desired nominal reset threshold (see Reset Threshold Range table at end of data sheet). range (-40C to +125C). /V denotes an automotive qualified part. Devices are available in both leaded and lead-free packaging. Applications Specify lead-free by replacing -T with +T when ordering. Automotive Note: There are eight standard versions of each device available Industrial (see Standard Versions table). Sample stock is generally held on standard versions only. Standard versions have an order Medical increment requirement of 2500 pieces. Nonstandard versions Embedded Control Systems have an order increment requirement of 10,000 pieces. Contact factory for availability of nonstandard versions. Pin Configuration Watchdog Timeout WATCHDOG TIMEOUT* TOP VIEW FAST SLOW SUFFIX MAX UNITS MIN UNITS MR 1 6 RESET A 1.5 ms 10 B 15 ms 100 ms MAX6323 GND 2 5 WDPO C 15 ms 300 MAX6324 D 15 ms 10 s E 15 ms 60 WDI 3 4 V CC F 23 ms 47 ms SOT23 G 39 ms 82 H 719 ms 1.3 s *See Figure 1 for operation. Typical Operating Circuit appears at end of data sheet. 19-1838 Rev 8 12/18MAX6323/MAX6324 P Supervisory Circuits with Windowed (Min/Max) Watchdog and Manual Reset Absolute Maximum Ratings Terminal Voltage (with respect to GND) Operating Temperature Range ......................... -40C to +125C V ...................................................................-0.3V to +6.0V Junction Temperature ......................................................+150C CC MR, RESET (MAX6323), WDI .............. -0.3V to (V + 0.3V) Storage Temperature Range ............................ -65C to +150C CC WDPO, RESET (MAX6324) .............................-0.3V to +6.0V Lead Temperature (soldering, 10s) .................................+300C Input Current, V , WDI, MR .............................................20mA Soldering Temperature (reflow) CC Output Current, RESET, WDPO ........................................20mA Lead(Pb)-Free .............................................................+260C Rate of Rise, V ..........................................................100V/s Containing Lead ..........................................................+240C CC Continuous Power Dissipation (T = +70C) A 6-Pin SOT23 (derate 8.7mW/C above +70C) ..........696mW Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Package Information 6 SOT23 PACKAGE CODE U6+1/U6+1A Outline Number 21-0058 Land Pattern Number 90-0175 Thermal Resistance, Single-Layer Board: Junction to Case ( ) 80C/W JC Thermal Resistance, Multi-Layer Board: Junction to Ambient ( ) 115C/W JA Junction to Case ( ) 80C/W JC For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a +, , or - in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial. Maxim Integrated 2 www.maximintegrated.com