DS1833 5V EconoReset www.maxim-ic.com FEATURES PIN ASSIGNMENT (cid:1) Automatically restarts microprocessor after power failure 1 (cid:1) Maintains active-high reset for 350 ms after DDASL1L8A33S Econo V returns to an in-tolerance condition Reset CC (cid:1) Accurate 5%, 10% or 15% microprocessor 5V power supply monitoring 2 4 3 (cid:1) Reduces need for discrete components TOP VIEW (cid:1) Precision temperature-compensated voltage SOT-23 PACKAGE See Mech. reference and voltage sensor Drawings Section On Website (cid:1) Low-cost TO-92 package or surface mount 1 2 3 SOT-223 package (cid:1) Internal 5k pull-up resistor 1 2 3 (cid:1) Operating temperature of -40(cid:1)C to +85(cid:1)C BOTTOM VIEW TO-92 PACKAGE See Mech. Drawings Section On Website PIN DESCRIPTION PIN 1 Ground PIN 2 Reset PIN 3 V CC PIN 4 Ground (SOT-223 only) DESCRIPTION The DS1833 EconoReset uses a precision temperature compensated reference and comparator circuit to monitor the status of the power supply (V ). When an out-of-tolerance condition is detected, an internal CC power fail signal is generated which forces reset to the active (high) state. When V returns to an in- CC tolerance condition, the reset signal is kept in the active state for approximately 350 ms to allow the power supply and processor to stabilize. OPERATION - POWER MONITOR The DS1833 provides the functions of detecting out-of-tolerance power supply conditions and warning a processor-based system of impending power failure. When V is detected as out-of-tolerance, as CC defined by the tolerance of the part selected, the RST signal is asserted. On power-up, RST is kept active for approximately 350 ms after the power supply has reached the selected tolerance. This allows the power supply and microprocessor to stabilize before RST is released. 1 of 5 041002

DS1833 BLOCK DIAGRAM Figure 1 APPLICATION EXAMPLE Figure 2 2 of 5

DS1833 POWER-UP Figure 3 POWER-DOWN Figure 4 3 of 5

DS1833 ABSOLUTE MAXIMUM RATINGS* Voltage on V Pin Relative to Ground -0.5V to +7.0V CC Voltage on I/O Relative to Ground -0.5V to V +0.5V CC Operating Temperature -40(cid:1)C to +85(cid:1)C Storage Temperature -55(cid:1)C to +125(cid:1)C Soldering Temperature 260(cid:1)C for 10 seconds * This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. RECOMMENDED DC OPERATING CONDITIONS (-40(cid:1)C to +85(cid:1)C) PARAMETER SYMBOL MIN TYP MAX UNITS NOTES Supply Voltage V 1.2 5.0 5.5 V 1 CC DC ELECTRICAL CHARACTERISTICS (-40(cid:1)C to +85(cid:1)C; V =5V (cid:2) 10%) DD PARAMETER SYMBOL MIN TYP MAX UNITS NOTES Low Level @ RST V 0.4 V 1 OL Output Current @ 0.4V I +8 mA OL Operating Current I 1.5 2 mA CC V Trip Point 5% V 4.5 4.625 4.74 V 1 CC CCTP1 V Trip Point 10% V 4.25 4.375 4.49 V 1 CC CCTP2 V Trip Point 15% V 4.0 4.125 4.24 V 1 CC CCTP3 Output Capacitance C 10 pF OUT Internal Pull-Up Resistor R 3.75 5 6.25 k(cid:2) P AC ELECTRICAL CHARACTERISTICS (-40(cid:1)C to +85(cid:1)C; V =5V (cid:2) 10%) CC PARAMETER SYMBOL MIN TYP MAX UNITS NOTES Reset Active Time t 250 350 450 ms RST V Detect to RST t 100 ns CC RPD V Slew Rate (4.75V - 4.00V) t 300 (cid:3)s CC F V Slew Rate (4.00V - 4.75V) t 0 ns CC R V Detect to RST t 250 350 450 ms CC RPU NOTES: 1. All voltages are referenced to ground. 4 of 5

DS1833 ECONORESET SELECTION GUIDE VCC TRIP POINT PUSHBUTTON DETECT MIN TYP MAX MIN TYP MAX DS1233-15 4.0 4.125 4.24 2.4 - 3.3 DS1233-10 4.25 4.375 4.49 2.4 - 3.3 DS1233-5 4.5 4.625 4.75 2.4 - 3.3 DS1233D-15 4.0 4.125 4.24 N/A N/A 5V DS1233D-10 4.25 4.375 4.49 N/A N/A DS1233D-5 4.5 4.625 4.75 N/A N/A DS1833-15 4.0 4.125 4.24 N/A N/A DS1833-10 4.25 4.375 4.49 N/A N/A DS1833-5 4.5 4.625 4.75 N/A N/A DS1233A-15 2.64 2.72 2.80 1.8 - 3.0 3.3V DS1233A-10 2.8 2.88 2.97 1.8 - 3.0 5 of 5