MAX6315US31D3+TG05

MAX6315 Open-Drain SOT µP Reset Circuit General Description Benefits and Features The MAX6315 low-power CMOS microprocessor (µP) supervisory circuit is designed to monitor power supplies in µP and digital systems. It provides excellent circuit reliability and low cost by eliminating external components and adjustments. The MAX6315 also provides a debounced manual reset input. This device performs a single function: it asserts a reset signal whenever the VCC supply voltage falls below a preset threshold or whenever manual reset is asserted. Reset remains asserted for an internally programmed interval (reset timeout period) after VCC has risen above the reset threshold or manual reset is deasserted. The MAX6315’s open-drain RESET output can be pulled up to a voltage higher than VCC. The MAX6315 comes with factory-trimmed reset threshold voltages in 100mV increments from 2.5V to 5V. Preset timeout periods of 1ms, 20ms, 140ms, and 1120ms (min) are also available. The device comes in a SOT143 package. For microcontrollers (µCs) and µPs with bidirectional reset pins, see the MAX6314 data sheet. • Supervisory Circuit Ensures Reliable System Operation with Minimal Power Consumption • Precision, Factory-Set VCC Reset Thresholds: 100mV Increments from 2.5V to 5V • Four Reset Timeout Periods Available: 1ms, 20ms, 140ms, or 1120ms (min) • Immune to Short VCC Transients • Open-Drain RESET Output Can Exceed VCC • Guaranteed Over Temperature • 5µA Supply Current • Pin Compatible with MAX811 • Saves Space • 4-Pin SOT143 Package Ordering Information NOMINAL VTH (V) PART† MAX6315US50D1-T MIN tRP (ms) TOP MARK†† 1 FX_ _ 5.00 †The MAX6315 is available in a SOT143 package, -40°C to +125°C temperature range. Applications ††The first two letters in the package top mark identify the part, Controllers while the remaining two letters are the lot tracking code. Devices are available in both leaded and lead-free packaging. Specify lead(Pb)-free by replacing “-T” with “+T” when ordering. Intelligent Instruments Note: All devices available in tape-and-reel only. Contact factory for availability. Computers Critical µP and µC Power Monitoring Portable/Battery-Powered Equipment Pin Configuration Ordering Information continued at end of data sheet. Typical Operating Circuit VCC TOP VIEW VCC GND 1 4 LASERTRIMMED RESISTORS VCC MAX6315 μP RESET 2 3 MR MR SOT143 RESET CIRCUITRY MAX6315 GND 19-2000; Rev 4; 4/15 RESET RESET Open-Drain SOT µP Reset Circuit MAX6315 Absolute Maximum Ratings VCC ........................................................................-0.3V to +6.0V RESET....................................................................-0.3V to +6.0V All Other Pins..............................................-0.3V to (VCC + 0.3V) Input Current (VCC) .............................................................20mA Output Current (RESET)......................................................20mA Rate of Rise (VCC) ...........................................................100V/µs Continuous Power Dissipation (TA = +70°C) SOT143 (derate 4mW/°C above +70°C) ........................320mW Operating Temperature Range .........................-40°C to +125°C Storage Temperature Range .............................-65°C to +160°C Lead Temperature (soldering, 10s) .................................+300°C 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 (VCC = +2.5V to +5.5V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER Operating Voltage Range VCC Supply Current SYMBOL VCC ICC Reset Threshold (Note 1) VTH Reset Threshold Tempco VCC to Reset Delay ΔVTH/°C Reset Timeout Period tRP CONDITIONS MIN TA = -40°C to +85°C 1.0 VCC = 5.5V, no load (-40°C to +85°C) VCC = 5.5V, no load (-40°C to +125°C) VCC = 3.6V, no load (-40°C to +85°C) VCC = 3.6V, no load (-40°C to +125°C) TA = +25°C VTH - 1.8% TA = -40°C to +85°C VTH - 2.5% TA = -40°C to +125°C VTH - 3.5% VCC = falling at 1mV/µs MAX6315US_ _D1-T (-40°C to +85°C) MAX6315US_ _D1-T (-40°C to +125°C) MAX6315US_ _D2-T (-40°C to +85°C) MAX6315US_ _D2-T (-40°C to +125°C) MAX6315US_ _D3-T (-40°C to +85°C) MAX6315US_ _D3-T (-40°C to +125°C) MAX6315US_ _D4-T (-40°C to +85°C) MAX6315US_ _D4-T (-40°C to +125°C) 1 0.8 20 16 140 112 1120 896 TYP 5 4 VTH 60 35 1.4 28 200 1570 MAX UNITS 5.5 12 15 10 12 VTH + 1.8% VTH + 2.5% VTH + 3.5% V µA V ppm/°C µs 2 2.4 40 48 280 336 2240 2688 ms MANUAL RESET INPUT MR Input Threshold VIL VIH VIL VIH VTH > 4.0V VTH < 4.0V MR Minimum Input Pulse 0.8 2.4 0.3 x VCC 0.7 x VCC 1 µs MR Glitch Rejection 100 MR to Reset Delay 500 MR Pullup Resistance RESET Output Voltage RESET Output Leakage Current 32 VOL 63 ns ns 100 VCC > 4.25V, ISINK = 3.2mA 0.4 VCC > 2.5V, ISINK = 1.2mA 0.3 VCC > 1.2V, ISINK = 0.5mA 0.3 VCC > 1.0V, ISINK = 80µA 0.3 VCC > VTH, RESET deasserted V 1 kΩ V µA Note 1: The MAX6315 monitors VCC through an internal factory-trimmed voltage-divider that programs the nominal reset threshold. Factory-trimmed reset thresholds are available in 100mV increments from 2.5V to 5V (see the Ordering Information). www.maximintegrated.com Maxim Integrated | 2 Open-Drain SOT µP Reset Circuit MAX6315 Typical Operating Characteristics (TA = +25°C, unless otherwise noted.) SUPPLY CURRENT vs. SUPPLY VOLTAGE VCC = 5V 4 3 VCC = 3V 2 VCC = 1V 1 TA = +85°C 3 TA = +25°C 2 TA = -40°C 1 0 0 -50 -30 -10 10 30 50 70 90 40 30 VTH = 4.63V 20 VTH = 3.00V 10 0 0 1 2 3 5 4 -50 -30 -10 30 10 50 70 90 SUPPLY VOLTAGE (V) TEMPERATURE (°C) NORMALIZED RESET TIMEOUT PERIOD vs. TEMPERATURE (VCC RISING) NORMALIZED RESET THRESHOLD vs. TEMPERATURE (VCC FALLING) MAXIMUM TRANSIENT DURATION vs. RESET COMPARATOR OVERDRIVE 1.01 1.00 0.99 0.98 0.97 0.96 1.004 1.002 1.000 0.998 0.996 -30 -10 10 30 50 TEMPERATURE (°C) 70 90 TA = +25°C RESET OCCURS ABOVE CURVE 80 VTH = 4.63V 60 40 20 VT = 3.00V 0 0.994 -50 100 MAXIMUM TRANSIENT DURATION (μs) 1.02 MAX6315-05 MAX6315-04 1.006 NORMALIZED RESET THRESHOLD 1.03 MAX6315-06 TEMPERATURE (°C) 1.04 NORMALIZED RESET TIMEOUT PERIOD 4 VCC FALLING AT 1mV/μs POWER-DOWN RESET DELAY (μs) 5 SUPPLY CURRENT (μA) SUPPLY CURRENT (μA) 5 50 MAX6315-02 6 MAX6315-01 6 POWER-DOWN RESET DELAY vs. TEMPERATURE MAX6315-03 SUPPLY CURRENT vs. TEMPERATURE -50 -30 -10 10 30 50 70 TEMPERATURE (°C) 90 10 100 1000 RESET COMP. OVERDRIVE, VTH - VCC (mV) Pin Description PIN NAME 1 GND 2 RESET 3 MR Manual Reset Input. A logic-low on MR asserts reset. Reset remains asserted as long as MR is low, and for the reset timeout period (tRP) after the reset conditions are terminated. Connect to VCC if not used. 4 VCC Supply Voltage and Reset Threshold Monitor Input www.maximintegrated.com FUNCTION Ground Active-Low Open-Drain Output. Connect to an external pullup resistor. Can be pulled up to a voltage higher than VCC, but less than 6V. Maxim Integrated | 3 MAX6315 Open-Drain SOT µP Reset Circuit Detailed Description +3.3V Reset Output A microprocessor’s (µP’s) reset input starts the µP in a known state. The MAX6315 asserts reset to prevent code-execution errors during power-up, powerdown, or brownout conditions. RESET is guaranteed to be a logic-low for V CC > 1V (see the Electrical Characteristics table). Once VCC exceeds the reset threshold, the internal timer keeps RESET asserted for the reset timeout period (tRP); after this interval RESET goes high. If a brownout condition occurs (monitored voltage dips below its programmed reset threshold), RESET goes low. Any time VCC dips below the reset threshold, the internal timer resets to zero and RESET goes low. The internal timer starts when VCC returns above the reset threshold, and RESET remains low for the reset timeout period. The MAX6315’s RESET output structure is a simple open-drain n-channel MOSFET switch. Connect a pullup resistor to any supply in the 0V to +6V range. Select a resistor value large enough to register a logic low when RESET is asserted (see the Electrical Characteristics table), and small enough to register a logic high while supplying all input current and leakage paths connected to the RESET line. A 10kΩ pullup is sufficient in most applications. Often, the pullup connected to the MAX6315’s RESET output will connect to the supply voltage monitored at the IC’s VCC pin. However, some systems may use the open-drain output to level-shift from the monitored supply to reset circuitry powered by some other supply (Figure 1). This is one useful feature of an open-drain output. Keep in mind that as the MAX6315’s V CC decreases below 1V, so does the IC’s ability to sink current at RESET. Finally, with any pullup, RESET will be pulled high as VCC decays toward 0V. The voltage where this occurs depends on the pullup resistor value and the voltage to which it connects (see the Electrical Characteristics table). Manual-Reset Input Many µP-based products require manual-reset capability, allowing the operator, a test technician, or external logic circuitry to initiate a reset. A logic low on MR asserts reset. Reset remains asserted while MR is low, and for the reset active timeout period after MR returns high. www.maximintegrated.com +5.0V VCC 10kΩ MR RESET 5V SYSTEM MAX6315 GND Figure 1. MAX6315 Open-Drain RESET Output Allows Use with Multiple Supplies MR has an internal 63kΩ pullup resistor, so it can be left open if not used. Connect a normally open momentary switch from MR to GND to create a manual-reset function; external debounce circuitry is not required. If MR is driven from long cables or if the device is used in a noisy environment, connecting a 0.1µF capacitor from MR to ground provides additional noise immunity. Applications Information Negative-Going VCC Transients In addition to issuing a reset to the µP during power-up, power-down, and brownout conditions, these devices are relatively immune to short-duration negative-going transients (glitches). The Typical Operating Characteristics show the Maximum Transient Duration vs. Reset Comparator Overdrive, for which reset pulses are not generated. The graph was produced using negativegoing pulses, starting at VRST max and ending below the programmed reset threshold by the magnitude indicated (reset threshold overdrive). The graph shows the maximum pulse width that a negative-going VCC transient may typically have without causing a reset pulse to be issued. As the transient amplitude increases (i.e., goes farther below the reset threshold), the maximum allowable pulse width decreases. A 0.1µF bypass capacitor mounted close to VCC provides additional transient immunity. Maxim Integrated | 4 Open-Drain SOT µP Reset Circuit MAX6315 Ordering Information (continued) PART† MAX6315US49D1-T MAX6315US48D1-T MAX6315US47D1-T MAX6315US46D1-T MAX6315US45D1-T MAX6315US44D1-T††† MAX6315US43D1-T MAX6315US42D1-T MAX6315US41D1-T MAX6315US40D1-T MAX6315US39D1-T MAX6315US38D1-T MAX6315US37D1-T MAX6315US36D1-T MAX6315US35D1-T MAX6315US34D1-T MAX6315US33D1-T MAX6315US32D1-T MAX6315US31D1-T MAX6315US30D1-T MAX6315US29D1-T MAX6315US28D1-T MAX6315US27D1-T MAX6315US26D1-T††† MAX6315US25D1-T NOMINAL VTH (V) 4.90 4.80 4.70 4.63 4.50 4.39 4.30 4.20 4.10 4.00 3.90 3.80 3.70 3.60 3.50 3.40 3.30 3.20 3.08 3.00 2.93 2.80 2.70 2.63 2.50 MIN tRP (ms) TOP MARK†† PART† 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 FY_ _ FZ_ _ GA_ _ GB_ _ GC_ _ GD_ _ GE_ _ GF_ _ GG_ _ GH_ _ GI_ _ GJ_ _ GK_ _ GL_ _ GM_ _ GN_ _ GO_ _ GP_ _ GQ_ _ GR_ _ GS_ _ GT_ _ GU_ _ GV_ _ GW_ _ MAX6315US50D2-T MAX6315US49D2-T MAX6315US48D2-T MAX6315US47D2-T MAX6315US46D2-T MAX6315US45D2-T MAX6315US44D2-T††† MAX6315US43D2-T MAX6315US42D2-T MAX6315US41D2-T MAX6315US40D2-T MAX6315US39D2-T MAX6315US38D2-T MAX6315US37D2-T MAX6315US36D2-T MAX6315US35D2-T MAX6315US34D2-T MAX6315US33D2-T MAX6315US32D2-T MAX6315US31D2-T MAX6315US30D2-T MAX6315US29D2-T MAX6315US28D2-T MAX6315US27D2-T MAX6315US26D2-T††† MAX6315US25D2-T NOMINAL VTH (V) 5.00 4.90 4.80 4.70 4.63 4.50 4.39 4.30 4.20 4.10 4.00 3.90 3.80 3.70 3.60 3.50 3.40 3.30 4.20 3.08 3.00 2.93 2.80 2.70 2.63 2.50 MIN tRP (ms) TOP MARK†† 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 GX_ _ GY_ _ GZ_ _ HA_ _ HB_ _ HC_ _ HD_ _ HE_ _ HF_ _ HG_ _ HH_ _ HI_ _ HJ_ _ HK_ _ HL_ _ HM_ _ HN_ _ HO_ _ HP_ _ HQ_ _ HR_ _ HS_ _ HT_ _ HU_ _ HV_ _ HW_ _ †The MAX6315 is available in a SOT143 package, -40°C to +125°C temperature range. ††The first two letters in the package top mark identify the part, while the remaining two letters are the lot tracking code. †††Sample stocks generally held on the bolded products; also, the bolded products have 2,500 piece minimum-order quantities. Non-bolded products have 10,000 piece minimum-order quantities. Contact factory for details. Devices are available in both leaded and lead(Pb)-free packaging. Specify lead-free by replacing “-T” with “+T” when ordering. Note: All devices available in tape-and-reel only. Contact factory for availability. www.maximintegrated.com Maxim Integrated | 5 Open-Drain SOT µP Reset Circuit MAX6315 Ordering Information (continued) PART† NOMINAL VTH (V) MAX6315US50D3-T MAX6315US49D3-T MAX6315US48D3-T MAX6315US47D3-T MAX6315US46D3-T††† MAX6315US45D3-T MAX6315US44D3-T††† MAX6315US43D3-T MAX6315US42D3-T MAX6315US41D3-T MAX6315US40D3-T MAX6315US39D3-T MAX6315US38D3-T MAX6315US37D3-T MAX6315US36D3-T MAX6315US35D3-T MAX6315US34D3-T MAX6315US33D3-T MAX6315US32D3-T MAX6315US31D3-T††† MAX6315US30D3-T MAX6315US29D3-T††† MAX6315US28D3-T MAX6315US27D3-T MAX6315US26D3-T††† MAX6315US25D3-T 5.00 4.90 4.80 4.70 4.63 4.50 4.39 4.30 4.20 4.10 4.00 3.90 3.80 3.70 3.60 3.50 3.40 3.30 3.20 3.08 3.00 2.93 2.80 2.70 2.63 2.50 MIN tRP (ms) TOP MARK†† 140 140 140 140 140 140 140 140 140 140 140 140 140 140 140 140 140 140 140 140 140 140 140 140 140 140 HX_ _ HY_ _ HZ_ _ IA_ _ IB_ _ IC_ _ ID_ _ IE_ _ IF_ _ IG_ _ IH_ _ II_ _ IJ_ _ IK_ _ IL_ _ IM_ _ IN_ _ IO_ _ IP_ _ IQ_ _ IR_ _ IS_ _ IT_ _ IU_ _ IV_ _ IW_ _ NOMINAL VTH (V) PART† MIN tRP (ms) TOP MARK†† MAX6315US50D4-T 5.00 1120 IX_ _ MAX6315US49D4-T MAX6315US48D4-T MAX6315US47D4-T MAX6315US46D4-T MAX6315US45D4-T MAX6315US44D4-T††† MAX6315US43D4-T MAX6315US42D4-T MAX6315US41D4-T MAX6315US40D4-T MAX6315US39D4-T MAX6315US38D4-T MAX6315US37D4-T MAX6315US36D4-T MAX6315US35D4-T MAX6315US34D4-T MAX6315US33D4-T MAX6315US32D4-T MAX6315US31D4-T MAX6315US30D4-T MAX6315US29D4-T MAX6315US28D4-T MAX6315US27D4-T MAX6315US26D4-T††† MAX6315US25D4-T 4.90 4.80 4.70 4.63 4.50 4.39 4.30 4.20 4.10 4.00 3.90 3.80 3.70 3.60 3.50 3.40 3.30 3.20 3.08 3.00 2.93 2.80 2.70 2.63 2.50 1120 1120 1120 1120 1120 1120 1120 1120 1120 1120 1120 1120 1120 1120 1120 1120 1120 1120 1120 1120 1120 1120 1120 1120 1120 IY_ _ IZ_ _ JA_ _ JB_ _ JC_ _ JD_ _ JE_ _ JF_ _ JG_ _ JH_ _ JI_ _ JJ_ _ JK_ _ JL_ _ JM_ _ JN_ _ JO_ _ JP_ _ JQ_ _ JR_ _ JS_ _ JT_ _ JU_ _ JV_ _ JW_ _ †The MAX6315 is available in a SOT143 package, -40°C to +125°C temperature range. ††The first two letters in the package top mark identify the part, while the remaining two letters are the lot tracking code. †††Sample stocks generally held on the bolded products; also, the bolded products have 2,500 piece minimum-order quantities. Non-bolded products have 10,000 piece minimum-order quantities. Contact factory for details. Devices are available in both leaded and lead(Pb)-free packaging. Specify lead-free by replacing “-T” with “+T” when ordering. Note: All devices available in tape-and-reel only. Contact factory for availability. Chip Information Package Information TRANSISTOR COUNT: 519 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. www.maximintegrated.com PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO. 4 SOT35 U4+1 21-0052 90-0183 Maxim Integrated | 6 Open-Drain SOT µP Reset Circuit MAX6315 Revision History REVISION NUMBER REVISION DATE 4 4/15 PAGES CHANGED DESCRIPTION Updated Benefits and Features and Package Information, added Revision History 1, 7 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com. Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. © 2015 Maxim Integrated Products, Inc. | 7