MAX6365MAX6368 19-1658 Rev 5 10/11 SOT23, Low-Power P Supervisory Circuits with Battery Backup and Chip-Enable Gating General Description Features The MAX6365MAX6368 supervisory circuits simplify Low +1.2V Operating Supply Voltage (V or V ) CC BATT power-supply monitoring, battery-backup control func- Precision Monitoring of +5.0V, +3.3V, +3.0V, and tions, and memory write protection in microprocessor +2.5V Power-Supply Voltages (P) systems. The circuits significantly improve the size, On-Board Gating of Chip-Enable Signals, 1.5ns accuracy, and reliability of modern systems with an ultra- Propagation Delay small integrated solution. Debounced Manual Reset Input (MAX6365) Watchdog Timer, 1.6s Timeout (MAX6366) These devices perform four basic system functions: Battery-On Output Indicator (MAX6367) 1) Provide a P reset output during V supply power- CC Auxiliary User-Adjustable RESET IN (MAX6368) up, power-down, and brownout conditions. Low 10A Quiescent Supply Current 2) Internally control V to backup-battery switching to Three Available Output Structures CC maintain data or low-power operation for CMOS Push-Pull RESET RAM, CMOS Ps, real-time clocks, and other digital Open-Drain RESET logic when the main supply fails. Open-Drain RESET RESET/RESET Valid Down to 1.2V Guaranteed 3) Provide memory write protection through internal (V or V ) CC BATT chip-enable gating during supply or processor faults. Power-Supply Transient Immunity 4) Include one of the following options: a manual reset 150ms min Reset Timeout Period input (MAX6365), a watchdog timer function Miniature 8-Pin SOT23 Package (MAX6366), a battery-on output (MAX6367), or an auxiliary user-adjustable reset input (MAX6368). Ordering Information The MAX6365MAX6368 operate from V supply volt- CC PART* TEMP RANGE PIN-PACKAGE ages as low as 1.2V. The factory preset reset threshold M A X6 3 6 5 LK A -T -40C to +85C 8 SOT23 voltages range from 2.32V to 4.63V (see the Ordering Information). In addition, each part is offered in three MAX6365PKA -T -40C to +85C 8 SOT23 reset output versions: push-pull active low, open-drain MAX6365HKA -T -40C to +85C 8 SOT23 active low, or open-drain active high (see the Selector M A X6 3 6 6 LK A -T -40C to +85C 8 SOT23 Guide). The MAX6365MAX6368 are available in minia- M A X 6 36 6P K A -T -40C to +85C 8 SOT23 ture 8-pin SOT23 packages. M A X 6 36 6H K A -T -40C to +85C 8 SOT23 Applications M A X6 3 6 7 LK A -T -40C to +85C 8 SOT23 Critical P/C Power Portable/Battery- M A X 6 36 7P K A -T -40C to +85C 8 SOT23 Monitoring Powered Equipment M A X 6 36 7P K A /V-T -40C to +85C 8 SOT23 Fax Machines Set-Top Boxes M A X 6 36 7H K A -T -40C to +85C 8 SOT23 Industrial Control POS Equipment M A X6 3 6 8 LK A -T -40C to +85C 8 SOT23 M A X 6 36 8P K A -T -40C to +85C 8 SOT23 Computers/Controllers M A X 6 36 8H K A -T -40C to +85C 8 SOT23 Pin Configurations *These parts offer a choice of reset threshold voltages. From the Reset Threshold Ranges table, insert the desired threshold volt- TOP VIEW age code in the blank to complete the part number. SOT parts come in tape and reel only and must be ordered in 2500-piece RESET, RESET 1 8 CE OUT increments. See Device Marking Codes for a complete parts list, including SOT top marks and standard threshold versions. See CE IN 2 7 BATT Selector Guide for a listing of device features. MAX6365 Devices are available in both leaded and lead(Pb)-free packaging. GND 3 6 OUT Specify lead-free by replacing -T with +T when ordering. MR 4 5 V -Denotes a package containing lead(Pb). CC T = Tape and reel. /V Denotes an automotive qualified part. SOT23 Pin Configurations continued at end of data sheet. Typical Operating Circuit appears at end of data sheet. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.SOT23, Low-Power P Supervisory Circuits with Battery Backup and Chip-Enable Gating ABSOLUTE MAXIMUM RATINGS Terminal Voltages (with respect to GND) Output Current V , BATT, OUT.......................................................-0.3V to +6V OUT ...............................Short-Circuit Protected for up to 10s CC RESET (open drain), RESET (open drain)................-0.3V to +6V RESET, RESET, BATT ON, CE OUT...............................20mA BATT ON, RESET (push-pull), RESET IN, Continuous Power Dissipation (T = +70C) A WDI, CE IN, CE OUT ...........................-0.3V to (V + 0.3V) 8-Pin SOT23 (derate 8.75mW/C above +70C)........700mW OUT MR ..............................................................-0.3V to (V + 0.3V) Operating Temperature Range ...........................-40C to +85C CC Input Current Storage Temperature Range .............................-65C to +150C V Peak ..............................................................................1A Junction Temperature .....................................................+150C CC V Continuous .............................................................250mA Lead Temperature (soldering, 10s) .................................+300C CC BATT Peak .....................................................................250mA Soldering Temperature (reflow) BATT Continuous .............................................................40mA Lead (Pb)-free packages..............................................+260C GND ...............................................................................75mA Packages containing lead (Pb).....................................+240C 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 = +2.4V to +5.5V, V = +3.0V, CE IN = V , reset not asserted, T = -40C to +85C. Typical values are at T = +25C, CC BATT CC A A unless otherwise noted.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Operating Voltage Range V , V No load 0 5.5 V CC BATT (Note 2) V = 2.8V 10 30 CC Supply Current I No load, V > V V = 3.6V 12 35 A CC CC TH CC (Excluding I ) OUT V = 5.5V 15 50 CC T = +25C1 A Supply Current in Battery- V = 2.8V, BATT I A BACK Backup Mode (Excluding I ) V = 0V OUT CC T = -40C to +85C3 A T = +25C -0.10 +0.02 5.5V > V > (V A CC BATT BATT Standby Current I A BATT + 0.2V) T = -40C to +85C -1.00 +0.05 A V = 4.75V, I = 150mA 3.1 CC OUT V to OUT On-Resistance R V = 3.15V, I = 65mA 3.7 CC ON CC OUT V = 2.38V, I = 25mA 4.6 CC OUT V - BATT V = 4.5V, I = 20mA BATT OUT 0.2 Output Voltage in Battery- V - BATT V V = 3.0V, I = 10mA V OUT BATT OUT Backup Mode 0.15 V - BATT V = 2.25V, I = 5mA BATT OUT 0.15 Power-up 20 Battery-Switchover Threshold V V < V mV SW CC TH (V - V ) CC BATT Power-down -20 MAX636 KA46 4.50 4.63 4.75 MAX636 KA44 4.25 4.38 4.50 MAX636 KA31 3.00 3.08 3.15 Reset Threshold V V TH MAX636 KA29 2.85 2.93 3.00 MAX636 KA26 2.55 2.63 2.70 MAX636 KA23 2.25 2.32 2.38 V Falling Reset Delay t V falling at 10V /ms 20 s CC RD CC 2 MAX6365MAX6368