MAX823/MAX824/MAX825 19-0487 Rev 5 12/05 5-Pin Microprocessor Supervisory Circuits With Watchdog Timer and Manual Reset General Description Features The MAX823/MAX824/MAX825* microprocessor (P) Precision Monitoring of +2.5V, +3V, +3.3V, and supervisory circuits combine reset output, watchdog, +5V Power Supplies and manual reset input functions in 5-pin SOT23 and Operating Current: 6A (MAX823L/M) (SC70) SC70 packages. They significantly improve system relia- 2A (MAX825T/S/R/Z/Y) (SC70) bility and accuracy compared to separate ICs or discrete Fully Specified Over Temperature components. The MAX823/MAX824/MAX825 are specifi- cally designed to ignore fast transients on V . 140ms min Power-On Reset CC Seven preprogrammed reset threshold voltages are Guaranteed RESET Valid to V = 1V CC available (see Reset Threshold Table). All three devices Power-Supply Transient Immunity have an active-low reset output, which is guaranteed to Watchdog Timer with 1.6s Timeout be in the correct state for V down to 1V. The MAX823 CC (MAX823/MAX824) also offers a watchdog input and manual reset input. The MAX824 offers a watchdog input and a comple- Manual Reset Input (MAX823/MAX825) mentary active-high reset. The MAX825 offers a manual No External Components reset input and a complementary active-high reset. The Selector Guide explains the functions offered in this Ordering Information series of parts. PART TEMP. RANGE PIN-PACKAGE *Pg 5 SC70-5 Applications MAX823 EXK-T -40C to +85C MAX823 EUK-T 5 SOT23-5 -40C to +125C Computers and Controllers 5 SC70-5 Embedded Controllers MAX824 EXK-T -40C to +85C Intelligent Instruments Insert the desired suffix letter (from the Reset Threshold table) into Automotive Systems the blank to complete the part number. All devices are available in tape-and-reel only. There is a 2500 piece minimum order increment. Critical P Monitoring Devices are available in both leaded and lead-free packaging. Portable/Battery-Powered Equipment Specify lead-free by replacing -T with +T when ordering. Reset Threshold Table Ordering Information continued at end of data sheet. RESET SUFFIX Selector Guide THRESHOLD (V) FUNCTION MAX823 MAX824 MAX825 L 4.63 M 4.38 Active-Low Reset T 3.08 Active-High Reset S 2.93 Watchdog Input R 2.63 Manual Reset Input Z (SC70 only) 2.32 Typical Operating Circuit appears at end of data sheet. Y (SC70 only) 2.19 Marking Information appears at end of data sheet. Pin Configurations TOP VIEW RESET 1 5 V RESET 1 5 V 1 5 V CC CC RESET CC MAX823 MAX824 MAX825 GND 2 GND 2 GND 2 3 WDI 3 3 MR 4 RESET 4 WDI RESET 4 MR SOT23/SC70 SOT23/SC70 SOT23/SC70 Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.5-Pin Microprocessor Supervisory Circuits With Watchdog Timer and Manual Reset ABSOLUTE MAXIMUM RATINGS V ........................................................................-0.3V to +6.0V 5-Pin SOT23 (derate 7.1mW/C above +70C).............571mW CC All Other Pins..............................................-0.3V to (V + 0.3V) Operating Temperature Range CC Input Current, All Pins Except RESET and RESET..............20mA MAX82 EXK......................................................-40C to +85C Output Current, RESET, RESET ..........................................20mA MAX82 EUK ...................................................-40C to +125C Continuous Power Dissipation (T = +70C) Storage Temperature Range .............................-65C to +150C A 5-Pin SC70 (derate 3.1mW/C above +70C)...............247mW Lead Temperature (soldering, 10s) .................................+300C 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. ELECTRICAL CHARACTERISTICS (V = +4.75V to +5.5V for MAX82 L, V = +4.5V to +5.5V for MAX82 M, V = +3.15V to +3.6V for MAX82 T, V = +3V CC CC CC CC to +3.6V for MAX82 S, V = +2.7V to +3.6V for MAX82 R, V = +2.38V to +2.75V for MAX82 Z, V = +2.25V to +2.75V for CC CC CC MAX82 Y, T = T to T , T = -40C to +85C (SC70), T = -40C to +125C (SOT23), unless otherwise noted. Typical values A MIN MAX A A are at T = +25C.) (Note 1) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS T = 0C to +70C 1.0 5.5 A Operating Voltage Range V V CC T = T to T 1.2 A MIN MAX MAX823L/M 10 24 MAX824L/M WDI and MR unconnected Supply Current MAX823T/S/R/Z/Y I 512 A SUPPLY (SOT23 Only) MAX824T/S/R/Z/Y MAX825L/M 4.5 12 MR unconnected MAX825T/S/R/Z/Y 38 MAX823L/M 617 MAX824L/M WDI and MR unconnected Supply Current MAX823T/S/R/Z/Y I 412 A SUPPLY (SC70 Only) MAX824T/S/R/Z/Y MAX825L/M 38 MR unconnected MAX825T/S/R/Z/Y 26 T = +25C 4.56 4.63 4.70 A MAX82 L T = T to T 4.50 4.75 A MIN MAX T = +25C 4.31 4.38 4.45 A MAX82 M T = T to T 4.25 4.50 A MIN MAX T = +25C 3.04 3.08 3.11 A MAX82 T T = T to T 3.00 3.15 A MIN MAX T = +25C 2.89 2.93 2.96 A Reset Threshold V MAX82 S V RST T = T to T 2.85 3.00 A MIN MAX T = +25C 2.59 2.63 2.66 A MAX82 R T = T to T 2.55 2.70 A MIN MAX T = +25C 2.28 2.32 2.35 A MAX82 Z (SC70 only) T = T to T 2.25 2.38 A MIN MAX T = +25C 2.16 2.19 2.22 A MAX82 Y (SC70 only) T = T to T 2.13 2.25 A MIN MAX 2 MAX823/MAX824/MAX825