19-0496; Rev 3; 1/99
5-Pin µP Supervisory Circuits with Watchdog and Manual Reset
________________General Description
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 1.12sec), and four watchdog timeout periods (from 6.3ms to 25.6sec). Nine 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 MAX6316–MAX6322 are offered in a miniature 5-pin SOT23 package.
________________________Applications
Portable Computers Computers Controllers
Intelligent Instruments Portable/Battery-Powered Equipment Embedded Control Systems
____________________________Features
♦Small 5-Pin SOT23 Package
♦Available in 26 Reset Threshold Voltages 2.5V to 5V, in 100mV Increments
♦Four Reset Timeout Periods
1ms, 20ms, 140ms, or 1.12sec (min)
♦ Four Watchdog Timeout Periods
6.3ms, 102ms, 1.6sec, or 25.6sec (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
_______________Ordering Information
PART |
TEMP. RANGE |
PIN-PACKAGE |
MAX6316LUK____-T |
-40°C to +85°C |
5 SOT23-5 |
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MAX6316MUK____-T |
-40°C to +85°C |
5 SOT23-5 |
MAX6317HUK____-T |
-40°C to +85°C |
5 SOT23-5 |
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MAX6318HUK____-T |
-40°C to +85°C |
5 SOT23-5 |
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MAX6318MHUK____-T |
-40°C to +85°C |
5 SOT23-5 |
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Ordering Information continued at end of data sheet.
Typical Operating Circuit and Pin Configurations appear at end of data sheet.
___________________________________________________________________Selector Guide
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WATCHDOG |
MANUAL |
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RESET OUTPUTS* |
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PART |
RESET |
ACTIVE-LOW |
ACTIVE-HIGH |
ACTIVE-LOW |
ACTIVE-LOW |
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INPUT |
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INPUT |
PUSH/PULL |
PUSH/PULL |
BIDIRECTIONAL |
OPEN-DRAIN |
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MAX6316L |
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MAX6316M |
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MAX6317H |
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MAX6318LH |
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MAX6318MH** |
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MAX6319LH |
— |
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MAX6319MH** |
— |
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MAX6320P |
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MAX6321HP |
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MAX6322HP |
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* The MAX6318/MAX6319/MAX6321/MAX6322 feature two types of reset output on each device. **Future product—contact factory for availability.
________________________________________________________________ Maxim Integrated Products 1
MAX6322–MAX6316
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769.
MAX6316–MAX6322
5-Pin µP Supervisory Circuits with Watchdog and Manual Reset
ABSOLUTE MAXIMUM RATINGS
Voltage (with respect to GND) |
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-0.3V to +6V |
VCC...................................................................... |
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RESET (MAX6320/MAX6321/MAX6322 only)...... |
-0.3V to +6V |
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All Other Pins......................................... |
-0.3V to (VCC + 0.3V) |
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Input/Output Current, All Pins ............................................. |
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20mA |
Continuous Power Dissipation (TA = +70°C) |
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SOT23-5 (derate 7.1mW/°C above +70°C) |
...............571mW |
Operating Temperature Range............................ |
- 40°C to +85°C |
Junction Temperature ...................................................... |
+150°C |
Storage Temperature Range.............................. |
- 65°C to +160°C |
Lead Temperature (soldering, 10sec).............................. |
+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 +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER |
SYMBOL |
CONDITIONS |
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MIN |
TYP |
MAX |
UNITS |
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Operating Voltage Range |
VCC |
TA = -40°C to +85°C |
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1 |
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5.5 |
V |
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MAX6316/MAX6317/MAX6318/ |
VCC = 5.5V |
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10 |
20 |
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MAX6320/MAX6321: |
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VCC = 3.6V |
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5 |
12 |
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Supply Current |
ICC |
MR and WDI unconnected |
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µA |
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MAX6319/MAX6322: |
VCC = 5.5V |
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5 |
12 |
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MR unconnected |
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VCC = 3.6V |
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3 |
8 |
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Reset Threshold Temperature |
VTH/°C |
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40 |
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ppm/°C |
Coefficient |
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Reset Threshold (Note 2) |
VRST |
TA = +25°C |
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VTH -1.5% |
VTH |
VTH +1.5% |
V |
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TA = -40°C to +85°C |
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VTH -2.5% VTH VTH +2.5% |
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Reset Threshold Hysteresis |
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mV |
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MAX63_ _A_-T |
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1 |
1.4 |
2 |
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Reset Active Timeout Period |
tRP |
MAX63_ _B_-T |
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20 |
28 |
40 |
ms |
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MAX63_ _C_-T |
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140 |
200 |
280 |
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MAX63_ _D_-T |
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1120 |
1600 |
2240 |
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VCC to RESET Delay |
tRD |
VCC falling at 1mV/µs |
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40 |
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µs |
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PUSH/PULL RESET OUTPUT (MAX6316L/MAX6317H/MAX6318_H/MAX6319_H/MAX6321HP/MAX6322HP) |
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VCC ≥ 1.0V, ISINK = 50µA |
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0.3 |
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VOL |
VCC ≥ 1.2V, ISINK = 100µA |
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0.3 |
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RESET Output Voltage |
VCC ≥ 2.7V, ISINK = 1.2mA |
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0.3 |
V |
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VCC ≥ 4.5V, ISINK = 3.2mA |
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0.4 |
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VOH |
VCC ≥ 2.7V, ISOURCE = 500µA |
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0.8 x VCC |
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VCC ≥ 4.5V, ISOURCE = 800µA |
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VCC - 1.5 |
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VOL |
VCC ≥ 2.7V, ISINK = 1.2mA |
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0.3 |
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VCC ≥ 4.5V, ISINK = 3.2mA |
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0.4 |
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RESET Output Voltage |
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VCC ≥ 1.8V, ISOURCE = 150µA |
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0.8 x VCC |
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V |
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VOH |
VCC ≥ 2.7V, ISOURCE = 500µA |
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0.8 x VCC |
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VCC ≥ 4.5V, ISOURCE = 800µA |
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VCC - 1.5 |
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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 2.5V to 5V (see Table 1 at end of data sheet).
2 _______________________________________________________________________________________
5-Pin µP Supervisory Circuits with Watchdog and Manual Reset
ELECTRICAL CHARACTERISTICS (continued)
(VCC = 2.5V to 5.5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER |
SYMBOL |
CONDITIONS |
MIN |
TYP |
MAX |
UNITS |
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BIDIRECTIONAL RESET OUTPUT |
(MAX6316M/MAX6318MH/MAX6319MH) |
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Transition Flip-Flop Setup Time |
tS |
(Note 3) |
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400 |
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ns |
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VCC = 3.0V, CL = 120pF |
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333 |
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RESET Output Rise Time |
tR |
VCC = 5.0V, CL = 200pF |
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333 |
ns |
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(Note 4) |
VCC = 3.0V, CL = 250pF |
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666 |
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VCC = 5.0V, CL = 400pF |
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666 |
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Active Pull-Up Enable Threshold |
VPTH |
VCC = 5.0V |
0.4 |
0.65 |
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V |
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RESET Active Pull-Up Current |
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VCC = 5.0V |
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20 |
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mA |
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RESET Pull-Up Resistance |
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4.2 |
4.7 |
5.2 |
kΩ |
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OPEN-DRAIN RESET OUTPUT |
(MAX6320P/MAX6321HP/MAX6322HP) |
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VCC ≥ 1.0V, ISINK = 50µA |
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0.3 |
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RESET Output Voltage |
VOL |
VCC ≥ 1.2V, ISINK = 100µA |
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0.3 |
V |
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VCC ≥ 2.7V, ISINK = 1.2mA |
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0.3 |
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VCC ≥ 4.5V, ISINK = 3.2mA |
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0.4 |
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Open-Drain Reset Output |
ILKG |
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1.0 |
µA |
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Leakage Current |
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WATCHDOG INPUT (MAX6316/MAX6317H/MAX6318_H/MAX6320P/MAX6321HP) |
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MAX63_ _ _ W-T |
4.3 |
6.3 |
9.3 |
ms |
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Watchdog Timeout Period |
tWD |
MAX63_ _ _ X-T |
71 |
102 |
153 |
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MAX63_ _ _ Y-T |
1.12 |
1.6 |
2.4 |
sec |
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MAX63_ _ _ Z-T |
17.9 |
25.6 |
38.4 |
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WDI Pulse Width |
tWDI |
VIL = 0.3 x VCC, VIH = 0.7 x VCC |
50 |
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WDI Input Threshold |
VIL |
(Note 5) |
0.3 x VCC |
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VIH |
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0.7 x VCC |
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WDI Input Current |
IWDI |
WDI = VCC, time average |
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120 |
160 |
µA |
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(Note 6) |
VWDI = 0, time average |
-20 |
-15 |
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MANUAL-RESET INPUT (MAX6316_/MAX6317H/MAX6319_H/MAX6320P/MAX6322HP) |
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VIL |
VTH > 4.0V |
0.8 |
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MR Input Threshold |
VIH |
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2.0 |
V |
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VIL |
VTH < 4.0V |
0.3 x VCC |
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VIH |
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0.7 x VCC |
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MR Input Pulse Width |
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MR Glitch Rejection |
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100 |
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MR Pull-Up Resistance |
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52 |
75 |
kΩ |
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MR to Reset Delay |
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VCC = 5V |
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230 |
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Note 3: This is the minimum time RESET must be held low by an external pull-down source to set the active pull-up flip-flop. Note 4: Measured from RESET VOL to (0.8 x VCC), RLOAD = ∞ .
Note 5: WDI is internally serviced within the watchdog period if WDI is left unconnected.
Note 6: 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.
MAX6322–MAX6316
_______________________________________________________________________________________ 3
MAX6316–MAX6322
5-Pin µP Supervisory Circuits with Watchdog and Manual Reset
__________________________________________Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
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MAX6316/17/19/20/22 |
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MAX6316/17/18/20/21 |
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VCC FALLING TO RESET PROPAGATION |
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MANUAL-RESET TO RESET |
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SUPPLY CURRENT vs. TEMPERATURE |
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DELAY vs. TEMPERATURE |
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PROPAGATION DELAY vs. TEMPERATURE |
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MAX6316toc01 |
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100 |
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MAX6316toc03 |
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320 |
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MAX6316toc04 |
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CURRENTSUPPLY(μA) |
2 |
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PROPAGATIONRESETDELAY (μs) |
20 |
VCC FALLING AT 1mV/μs |
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PROPAGATIONDELAY (ns) |
180 |
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VCC = 5V |
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VCC = 5V |
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90 |
VRST - VCC = 100mV |
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300 |
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80 |
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280 |
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260 |
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240 |
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50 |
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VCC = 3V |
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220 |
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4 |
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40 |
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3 |
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30 |
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200 |
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1 |
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VCC |
= 1V |
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10 |
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160 |
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0 |
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0 |
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140 |
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-40 |
-20 |
0 |
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20 |
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40 60 80 100 |
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-40 -20 |
0 |
20 |
40 |
60 |
80 |
100 |
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-40 |
-20 0 |
20 40 |
60 |
80 |
100 |
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TEMPERATURE (°C) |
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TEMPERATURE (°C) |
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TEMPERATURE (°C) |
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NORMALIZED RESET TIMEOUT |
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MAX6316/17/18/20/21 |
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NORMALIZED WATCHDOG TIMEOUT |
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PERIOD vs. TEMPERATURE |
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PERIOD vs. TEMPERATURE |
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RESETNORMALIZEDTIMEOUT PERIOD |
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1.05 |
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MAX6316toc05 |
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WATCHDOGNORMALIZEDTIMEOUT PERIOD |
1.05 |
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MAX6316toc06 |
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0.96 |
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0.96 |
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1.04 |
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1.04 |
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1.03 |
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1.03 |
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1.02 |
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1.02 |
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1.01 |
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1.01 |
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1.00 |
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1.00 |
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0.99 |
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0.99 |
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0.98 |
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0.98 |
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0.97 |
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0.97 |
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0.95 |
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0.95 |
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-40 |
-20 |
0 |
20 |
40 |
60 |
80 |
100 |
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-40 |
-20 |
0 |
20 |
40 |
60 |
80 |
100 |
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TEMPERATURE (°C) |
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TEMPERATURE (°C) |
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TRANSIENT DURATION (μs)
MAXIMUM VCC TRANSIENT DURATION |
MAX6316M/6318MH/6319MH |
|||||
|
BIDIRECTIONAL |
|||||
|
vs. RESET THRESHOLD OVERDRIVE |
|
PULL-UP CHARACTERISTICS |
|||
80 |
RESET OCCURS ABOVE LINES |
MAX6316toc08 |
|
+5V |
|
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||
70 |
|
74HC05 |
4.7k |
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|||
VRST = 3.3V |
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60 |
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100pF |
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|
INPUT |
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||
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|
50 |
VRST = 4.63V |
|
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|
40 |
VRST = 2.63V |
|
|
|
74HC05 |
+5V |
|
|
|
INPUT |
VCC |
||
30 |
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||
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100pF |
RESET |
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20 |
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MR GND |
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10 |
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0 |
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10 |
100 |
1000 |
|
|
200ns/div |
|
RESET THRESHOLD OVERDRIVE (mV) VRST - VCC |
|
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|
|
PASSIVE 4.7kΩ PULL-UP 2V/div
RESET, ACTIVE PULL-UP 2V/div
RESET INPUT 5V/div
4 _______________________________________________________________________________________
5-Pin µP Supervisory Circuits with Watchdog and Manual Reset
______________________________________________________________Pin Description
|
|
PIN |
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|
MAX6316L |
|
|
MAX6318LH |
MAX6319LH |
NAME |
FUNCTION |
MAX6316M |
MAX6317H |
|
MAX6318MH |
MAX6319MH |
|
|
MAX6320P |
|
|
MAX6321HP |
MAX6322HP |
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MAX6316L/MAX6318LH/MAX6319LH: |
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|
Active-Low, Reset Output. CMOS push/pull |
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output (sources and sinks current). |
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MAX6316M/MAX6318MH/MAX6319MH: |
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|
|
Bidirectional, Active-Low, Reset Output. |
1 |
— |
|
1 |
1 |
RESET |
Intended to interface directly to microprocessors |
|
with bidirectional resets such as the Motorola |
|||||
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68HC11. |
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MAX6320P/MAX6321HP/MAX6322HP: |
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|
Open-Drain, Active-Low, Reset Output. NMOS out- |
|
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|
put (sinks current only). Connect a pull-up resistor |
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|
from RESET to any supply voltage up to 6V. |
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|
|
— |
1 |
|
3 |
3 |
RESET |
Active-High, Reset Output. CMOS push/pull output |
|
||||||
|
(sources and sinks current). Inverse of RESET. |
|||||
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2 |
2 |
|
2 |
2 |
GND |
Ground |
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|
Active-Low, Manual Reset Input. Pull low to force a |
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|
reset. Reset remains asserted for the duration of |
3 |
3 |
|
— |
4 |
MR |
the Reset Timeout Period after MR transitions from |
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|
|
low to high. Leave unconnected or connected to |
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|
|
VCC if not used. |
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|
Watchdog Input. Triggers a reset if it remains |
|
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|
|
either high or low for the duration of the watchdog |
|
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|
|
timeout period. The internal watchdog timer clears |
4 |
4 |
|
4 |
— |
WDI |
whenever a reset asserts or whenever WDI sees a |
|
|
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|
|
|
rising or falling edge. To disable the watchdog fea- |
|
|
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|
|
|
ture, leave WDI unconnected or three-state the dri- |
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|
|
ver connected to WDI. |
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|
|
Supply Voltage. Reset is asserted when VCC |
|
|
|
|
|
|
drops below the Reset Threshold Voltage (VRST). |
5 |
5 |
|
5 |
5 |
VCC |
Reset remains asserted until VCC rises above |
|
|
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|
|
|
VRST and for the duration of the Reset Timeout |
|
|
|
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|
|
Period (tRP) once VCC rises above VRST. |
|
|
|
|
|
|
|
MAX6322–MAX6316
_______________________________________________________________________________________ 5