|Category||Power Management => Supervisory Circuits => Microprocessor Supervisors|
|Description||5-Pin µP Supervisory Circuits With Watchdog And Manual Reset
The MAX6316–MAX6322 family of microprocessor (µP) supervisory circuits monitors power supplies and microprocessor activity in digital systems. It offers several combinations of push/pull, open-drain, and bidirectional (such as Motorola 68HC11) reset outputs, along with watchdog and manual reset features. The Selector Guide below lists the specific functions available from each device. These devices are specifically designed to ignore fast negative transients on VCC. Resets are guaranteed valid for VCC down to 1V.
These devices are available in 26 factory-trimmed reset threshold voltages (from 2.5V to 5V, in 100mV increments), featuring four minimum power-on reset timeout periods (from 1ms to 1.12s), and four watchdog timeout periods (from 6.3ms to 25.6s). Thirteen standard versions are available with an order increment requirement of 2500 pieces (see Standard Versions table in the full data sheet); contact the factory for availability of other versions, which have an order increment requirement of 10,000 pieces.
|Company||Maxim Integrated Products|
|Datasheet||Download MAX6318MHUK35CW-T datasheet
|Cross ref.||Similar parts: TPS6734|
5-Pin µP Supervisory Circuits with Watchdog and Manual Reset
The MAX6316MAX6322 family of microprocessor (µP) supervisory circuits monitors power supplies and microprocessor activity in digital systems. It offers several combinations of push/pull, open-drain, and bidirectional (such as Motorola 68HC11) reset outputs, along with watchdog and manual reset features. The Selector Guide below lists the specific functions available from each device. These devices are specifically designed to ignore fast negative transients on VCC. Resets are guaranteed valid for VCC down to 1V. These devices are available in 26 factory-trimmed reset threshold voltages (from in 100mV increments), featuring four minimum power-on reset timeout periods (from to 1.12s), and four watchdog timeout periods (from to 25.6s). Thirteen standard versions are available with an order increment requirement of 2500 pieces (see Standard Versions table); contact the factory for availability of other versions, which have an order increment requirement of 10,000 pieces. The MAX6316MAX6322 are offered in a miniature 5-pin SOT23 package.
Small 5-Pin SOT23 Package Available in 26 Reset Threshold Voltages in 100mV Increments Four Reset Timeout Periods or 1.12s (min) Four Watchdog Timeout Periods or 25.6s (typ) Four Reset Output Stages Active-High, Push/Pull Active-Low, Push/Pull Active-Low, Open-Drain Active-Low, Bidirectional Guaranteed Reset Valid to VCC = 1V Immune to Short Negative VCC Transients Low Cost No External Components
Portable Computers Controllers Intelligent Instruments Portable/Battery-Powered Equipment Embedded Control Systems
Devices are available in both leaded and lead-free packaging. Specify lead-free by replacing "-T" with "+T" when ordering. Ordering Information continued at end of data sheet. Typical Operating Circuit and Pin Configurations appear at end of data sheet.
PART MAX6321HP MAX6322HP WATCHDOG INPUT MANUAL RESET INPUT RESET OUTPUTS* ACTIVE-LOW PUSH/PULL ACTIVE-HIGH PUSH/PULL ACTIVE-LOW BIDIRECTIONAL ACTIVE-LOW OPEN-DRAIN* The MAX6318/MAX6319/MAX6321/MAX6322 feature two types of reset output on each device.
For pricing, delivery, and ordering information, please contact Maxim Direct 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.5-Pin µP Supervisory Circuits with Watchdog and Manual Reset MAX6316MAX6322
Voltage (with respect to GND) to +6V RESET (MAX6320/MAX6321/MAX6322 only)...... to +6V All Other Pins.........................................-0.3V to (VCC + 0.3V) Input/Output Current, All Pins.............................................20mA Continuous Power Dissipation (TA +70°C) SOT23-5 (derate 7.1mW/°C above +70°C)...............571mW Operating Temperature to +125°C Junction Temperature......................................................+150°C Storage Temperature 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.(VCC to +125°C, unless otherwise noted. Typical values are = +25°C.) (Note 1)
PARAMETER Operating Voltage Range SYMBOL VCC CONDITIONS MAX6316/MAX6317/MAX 6318/MAX6320/MAX6321 Supply Current ICC MAX6319/MAX6322: MR unconnected VCC = 5.5V VCC = 3.6V VCC = 5.5V VCC = 3.6V MIN MAX63_ _ A_-T Reset Active Timeout Period tRP MAX63_ _ B_-T MAX63_ _ C_-T MAX63_ _ D_-T VCC to RESET Delay tRD VCC falling at 1mV/µs VCC 1.0V, ISINK = 50µA VOL RESET Output Voltage VOH RESET Rise Time MAX6319LH) tR VOL RESET Output Voltage VOH VCC 1.2V, ISINK = 100µA VCC 2.7V, ISINK = 1.2mA VCC 4.5V, ISINK = 3.2mA VCC 2.7V, ISOURCE = 500µA VCC 4.5V, ISOURCE = 800µA Rise time is measured from 90% of VCC; = 5pF, VCC = 3.3V (Note 3) VCC 2.7V, ISINK = 1.2mA VCC 4.5V, ISINK = 3.2mA VCC 1.8V, ISOURCE = 150µA VCC 2.7V, ISOURCE = 500µA VCC 4.5V, ISOURCE 0.8 x VCC 0.8 x VCC 0.8 x VCC V ns VTH - 1.5% VTH µs ms VTH + 1.5% VTH + 2.5% TYP MAX ppm/°C mV µA UNITS VReset Threshold Temperature Coefficient Reset Threshold (Note 2) Reset Threshold Hysteresis
Note 1: Over-temperature limits are guaranteed by design, not production tested. Note 2: A factory-trimmed voltage divider programs the nominal reset threshold (VTH). Factory-trimmed reset thresholds are available in 100mV increments from to 5V (see Table 1 at end of data sheet). Note 3: Guaranteed by design. 2(VCC to +125°C, unless otherwise noted. Typical values are = +25°C.) (Note 1)
PARAMETER Transitional Flip-Flop Setup Time RESET Output Rise Time (Note 5) Active Pullup Enable Threshold RESET Active Pullup Current RESET Pullup Resistance SYMBOL tS (Note 4) VCC = 120pF VCC = 200pF VCC = 250pF VCC = 400pF VPTH VCC = 5.0V VCC to +125°C VCC > 1.0V, ISINK = 50µA RESET Output Voltage VOL VCC > 1.2V, ISINK = 100µA VCC > 2.7V, ISINK = 1.2mA VCC > 4.5V, ISINK = 3.2mA Open-Drain Reset Output Leakage Current ILKG µA V CONDITIONS MIN TYP mA k MAX UNITS ns BIDIRECTIONAL RESET OUTPUT (MAX6316M/MAX6318MH/MAX6319MH)
WATCHDOG INPUT MAX63_ _ _W-T Watchdog Timeout Period tWD MAX63_ _ _X-T MAX63_ _ _Y-T MAX63_ _ _Z-T VIL 0.3 x VCC, VIH 0.7 x VCC (Note 6) WDI = VCC, time average VWDI = 0V, time average x VCC 0.7 x VCC V x VCC 0.7 x VCC V µAWDI Pulse Width WDI Input Threshold WDI Input Current (Note 7)
MANUAL RESET INPUT (MAX6316_/MAX6317H/MAX6319_H/MAX6320P/MAX6322HP) VIL MR Input Threshold VIH VIL VIH MR Input Pulse Width MR Glitch Rejection MR Pullup Resistance MR to Reset Delay VTH > 4.0V VTH to +125°C
This is the minimum time RESET must be held low by an external pulldown source to set the active pullup flip-flop. Measured from RESET VOL (0.8 x VCC), RLOAD WDI is internally serviced within the watchdog period if WDI is left unconnected. The WDI input current is specified as the average input current when the WDI input is driven high or low. The WDI input is designed for a three-stated-output device with a 10µA maximum leakage current and capable of driving a maximum capacitive load of 200pF. The three-state device must be able to source and sink at least 200µA when active. 3
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