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Supervisory Circuits with Watchdog and Manual Reset in 5-Lead SOT-23
ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/ADM6321/ADM6322
FEATURES
26 reset threshold options: 2.5 V to 5 V in 100 mV increments 4 reset timeout options: 1 ms, 20 ms, 140 ms, and 1120 ms (min) 4 watchdog timeout options: 6.3 ms, 102 ms, 1600 ms, and 25.6s (typ) Manual reset input Reset output stages: Push-pull active-low Open-drain active-low Push-pull active-high Low power consumption (5 A) Guaranteed reset output valid to VCC = 1 V Power supply glitch immunity Specified over industrial temperature range 5-lead SOT-23 package
FUNCTIONAL BLOCK DIAGRAM
ADM6316
VCC VCC VREF RESET GENERATOR
RESET
MR
DEBOUNCE WATCHDOG DETECTOR
04533-0-001
GND
WDI
Figure 1.
APPLICATIONS
Microprocessor systems Computers Controllers Intelligent instruments Portable equipment
GENERAL DESCRIPTION
The ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/ ADM6321/ADM6322 are supervisory circuits, which monitor power supply voltage levels and code execution integrity in microprocessor-based systems. As well as providing power on reset signals, an on-chip watchdog timer can reset the microprocessor if it fails to strobe within a preset timeout period. A reset signal can also be asserted by an external push-button, through a manual reset input. The seven parts feature different combinations of watchdog input, manual reset input, and output stage configuration, as shown in Table 1. Table 1. Selection Table
Output Stage Part No. ADM6316 ADM6317 ADM6318 ADM6319 ADM6320 ADM6321 ADM6322
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners.
Each part is available in a choice of 26 reset threshold options ranging from 2.5 V to 5 V in 100 mV increments. There are also four reset timeout options of 1 ms, 20 ms, 140 ms, and 1120 ms (min) and four watchdog timeout options of 6.3 ms, 102 ms, 1600 ms, and 25.6s (typ). The ADM6316-ADM6322 are available in 5-lead SOT-23 packages and typically consume only 3 A, making them suitable for use in low power portable applications.
Watchdog Yes Yes Yes - Yes Yes -
Manual Reset Yes Yes - Yes Yes Yes
RESET Push-Pull - Push-Pull Push-Pull Open-Drain Open-Drain Open-Drain
RESET - Push-Pull Push-Pull Push-Pull - Push-Pull Push-Pull
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.326.8703 (c) 2004 Analog Devices, Inc. All rights reserved.
ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/ADM6321/ADM6322
TABLE OF CONTENTS
Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 5 ESD Caution.................................................................................. 5 Pin Configurations and Function Descriptions ........................... 6 Typical Performance Characteristics ............................................. 7 Circuit Description......................................................................... 10 Reset Output ............................................................................... 10 Open-Drain RESET Output...................................................... 10 Manual Reset Input .................................................................... 10 Watchdog Input .......................................................................... 10 Application Information................................................................ 11 Watchdog Input Current ........................................................... 11 Negative-Going VCC Transients ................................................ 11 Ensuring Reset Valid to VCC = 0 V ........................................... 11 Watchdog Software Considerations......................................... 11 Outline Dimensions ....................................................................... 12 Ordering Guide .......................................................................... 12
REVISION HISTORY
10/04--Revision 0: Initial Version
Rev. 0 | Page 2 of 12
ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/ADM6321/ADM6322
SPECIFICATIONS
VCC = full operating range, TA = TMIN to TMAX, unless otherwise noted. Table 2.
Parameter SUPPLY VCC Operating Voltage Range Supply Current RESET THRESHOLD VOLTAGE RESET THRESHOLD TEMPERATURE COEFFICIENT RESET THRESHOLD HYSTERESIS RESET TIMEOUT PERIOD ADM63__A ADM63__B ADM63__C ADM63__D VCC TO RESET DELAY PUSH-PULL OUTPUT (ADM6316, ADM6317, ADM6318, ADM6319, ADM6321, ADM6322) RESET Output Voltage Min 1 10 5 VTH VTH 40 3 1.4 28 200 1600 40 Typ Max 5.5 20 12 VTH + 1.5% VTH + 2.5% Unit V A A V V ppm/C mV ms ms ms ms s Test Conditions/Comments
VTH - 1.5% VTH - 2.5%
VCC = 5.5 V VCC = 3.6 V TA = +25C TA = -40C to +85C
1 20 140 1120
2 40 280 2240
VCC falling at 1 mV/s
0.3 0.3 0.3 0.4 0.8 x VCC VCC - 1.5
RESET Rise Time RESET Output Voltage 0.8 x VCC 0.8 x VCC VCC - 1.5 OPEN-DRAIN OUTPUT (ADM6320, ADM6321, ADM6322) RESET Output Voltage
5
25 0.3 0.4
V V V V V V ns V V V V V
VCC 1.0 V, ISINK = 50 A VCC 1.2 V, ISINK = 100 A VCC 2.7 V, ISINK = 1.2 mA VCC 4.5 V, ISINK = 3.2 mA VCC 2.7 V, ISOURCE = 500 A VCC 4.5 V, I SOURCE = 800 A From 10% to 90% VCC, CL = 5 pF, VCC = 3.3 V VCC 2.7 V, ISINK = 1.2 mA VCC 4.5 V, ISINK = 3.2 mA VCC 1.8 V, ISOURCE = 150 A VCC 2.7 V, ISOURCE = 500 A VCC 4.5 V, I SOURCE = 800 A
Open-Drain Reset Output Leakage Current WATCHDOG INPUT (ADM6316, ADM6317, ADM6318, ADM6320, ADM6321) Watchdog Timeout Period
0.3 0.3 0.3 0.4 1
V V V V A
VCC 1.0 V, ISINK = 50 A VCC 1.2 V, ISINK = 100 A VCC 2.7 V, ISINK = 1.2 mA VCC 4.5 V, ISINK = 3.2 mA
WDI Pulse Width WDI Input Threshold WDI Input Current
4.3 71 1.12 17.9 50 0.3 x VCC -20
6.3 102 1.6 25.6
9.3 153 2.4 38.4 0.7 x VCC 160
120 -15
ms ms s s ns V A A
ADM63___W ADM63___X ADM63___Y ADM63___Z VIL = 0.3 x VCC, VIH = 0.7 x VCC VWDI = VCC, time average VWDI = 0, time average
Rev. 0 | Page 3 of 12
ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/ADM6321/ADM6322
Parameter MANUAL RESET INPUT (ADM6316, ADM6317, ADM6319, ADM6320, ADM6322) MR Input Threshold MR Input Pulse Width MR Glitch Rejection MR Pull-up Resistance MR to Reset Delay Min Typ Max Unit Test Conditions/Comments
0.8 0.3 x VCC 1 35 100 52 230
2.0 0.7 x VCC
75
V V s ns k ns
VTH > 4.0 V VTH < 4.0 V
VCC = 5 V
Rev. 0 | Page 4 of 12
ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/ADM6321/ADM6322
ABSOLUTE MAXIMUM RATINGS
TA = 25C, unless otherwise noted. Table 3.
Parameter VCC RESET (ADM6320, ADM6321, ADM6322) All Other Pins Output Current (RESET, RESET) Operating Temperature Range Storage Temperature Range JA Thermal Impedance, SOT-23 Lead Temperature Soldering (10 s) Vapour Phase (60 s) Infrared (15 s) Rating -0.3 V to +6 V -0.3 V to +6 V -0.3 V to (VCC + 0.3 V) 20 mA -40C to +85C -65C to +125C 270C/W 300C 215C 220C
Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although this product features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality.
Rev. 0 | Page 5 of 12
ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/ADM6321/ADM6322
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
RESET 1
5
VCC
RESET 1
5
VCC
GND 2
ADM6316/ ADM6320
04533-0-002
ADM6317
GND 2
04533-0-003 04533-0-004
MR 3
TOP VIEW (Not to Scale)
TOP VIEW (Not to Scale)
4
4
WDI
MR 3
WDI
Figure 2. ADM6316/ADM6320 Pin Configuration
Figure 3. ADM6317 Pin Configuration
RESET 1
5
VCC
RESET 1
5
VCC
GND 2
ADM6318/ ADM6321
04533-0-004
GND 2
ADM6319/ ADM6322
TOP VIEW (Not to Scale)
4
RESET 3
TOP VIEW (Not to Scale)
4
WDI
RESET 3
MR
Figure 4. ADM6318/ADM6321 Pin Configuration
Figure 5. ADM6319/ADM6322 Pin Configuration
Table 4. Pin Function Descriptions
Pin No. 1 Mnemonic RESET (ADM6316/ADM6318/ ADM6319/ADM6320/ADM6321/ ADM6322) RESET (ADM6317) GND MR (ADM6316/ADM6317/ ADM6320) RESET (ADM6318/ADM6319/ ADM6321/ADM6322) WDI (ADM6316/ADM6317/ ADM6318/ADM6320/ADM6321) MR (ADM6319/ADM6322) VCC Description Active-Low Reset Output. Asserted whenever VCC is below the reset threshold, VTH. Push-Pull Output Stage for the ADM6316/ADM6318/ADM6319. Open-Drain Output Stage for the ADM6320/ADM6321/ADM6322. Active-High, Push-Pull Reset Output. Ground. Manual Reset Input. This is an active-low input which, when forced low for at least 1 s, generates a reset. It features a 52 k internal pull-up. Active-High, Push-Pull Reset Output. Watchdog Input. Generates a reset if the logic level on the pin remains low or high for the duration of the watchdog timeout. The timer is cleared if a logic transition occurs on this pin or if a reset is generated. Leave floating to disable the watchdog timer. Manual Reset Input. Power Supply Voltage Being Monitored.
2 3
4
5
Rev. 0 | Page 6 of 12
ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/ADM6321/ADM6322
TYPICAL PERFORMANCE CHARACTERISTICS
10.0 9.5 9.0 8.5 8.0 7.5 VCC = 5V
80 100 90
VCC TO RESET DELAY (s)
VCC = 1.5V
04533-0-006
70 60 50 40 30 20 10 0 -40
04533-0-009 04533-0-011 04533-0-010
ICC (A)
7.0 6.5 6.0 5.5 5.0 4.5 4.0 3.5 -40 -20 0 VCC = 3V
20 40 TEMPERATURE (C)
60
80
-20
0
20 40 TEMPERATURE (C)
60
80
Figure 6. Supply Current vs. Temperature (ADM6316/ADM6317/ADM6318/ADM6320/ADM6321)
Figure 9. VCC Falling to Reset Propagation Delay vs. Temperature
80
340
MANUAL RESET TO RESET DELAY (ns)
04533-0-007
75 70 65 60 55 50 45 40 35 30 25 20 15 10 5 0 0 0.5 1.0 1.5 2.0 2.5 3.0 VCC (V) 3.5 4.0 4.5 5.0 5.5
320 300 280 260 240 220 200 180 160 140 120 100 -40 -20 0 20 40 TEMPERATURE (C) 60 80
ICC (A)
Figure 7. Supply Current vs. Supply Voltage
Figure 10. Manual Reset to Reset Propagation Delay vs. Temperature (ADM6316/ADM6317/ADM6319/ADM6320/ADM6322)
1.05 1.04
1.20 1.15
NORMALIZED RESET THRESHOLD
NORMALIZED RESET TIMEOUT
04533-0-008
1.03 1.02 1.01 1.00 0.99 0.98 0.97 0.96 0.95 -40
1.10 1.05 1.00 0.95 0.90 0.85 0.80 -40
-20
0
20 40 TEMPERATURE (C)
60
80
-20
0
20 40 TEMPERATURE (C)
60
80
Figure 8. Normalized Reset Threshold vs. Temperature
Figure 11. Normalized Reset Timeout Period vs. Temperature
Rev. 0 | Page 7 of 12
ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/ADM6321/ADM6322
1.20
190 180
NORMALIZED WATCHDOG TIMEOUT
1.15
MR MINIMUM PULSE WIDTH (ns)
04533-0-012
170 160 150 140 130 120 110
1.10
1.05
1.00
0.95
0.90 -40
-20
0
20 40 TEMPERATURE (C)
60
80
100 -50
0 TEMPERATURE (C)
50
Figure 12. Normalized Watchdog Timeout Period vs. Temperature (ADM6316/ADM6317/ADM6318/ADM6320/ADM6321)
Figure 14. Manual Reset Minimum Pulse Width vs. Temperature (ADM6316/ADM6317/ADM6319/ADM6320/ADM6322)
160 140 120 100 VTH = 4.63V 80 60 40 20 VTH = 2.93V 0 10
RESET OCCURS ABOVE CURVE
3.8 3.6 3.4 3.2 3.0 2.8 2.6 2.4 2.2
04533-0-013
MAXIMUM TRANSIENT DURATION (s)
MINIMUM PULSE WIDTH (ns)
NEGATIVE PULSE
POSITIVE PULSE
100 OVER DRIVE VOD (mV)
1000
2.0 -40
10 TEMPERATURE (C)
60
Figure 13. Maximum VCC Transient Duration vs. Reset Threshold Overdrive
Figure 15. Watchdog Input Minimum Pulse Width vs. Temperature (ADM6316/ADM6317/ADM6318/ADM6320/ADM6321)
Rev. 0 | Page 8 of 12
04333-0-015
04533-0-014
ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/ADM6321/ADM6322
Table 5. Reset Threshold Options
Part No. ADM63 _ _ _ 50 ADM63 _ _ _ 49 ADM63 _ _ _ 48 ADM63 _ _ _ 47 ADM63 _ _ _ 46 ADM63 _ _ _ 45 ADM63 _ _ _ 44 ADM63 _ _ _ 43 ADM63 _ _ _ 42 ADM63 _ _ _ 41 ADM63 _ _ _ 40 ADM63 _ _ _ 39 ADM63 _ _ _ 38 ADM63 _ _ _ 37 ADM63 _ _ _ 36 ADM63 _ _ _ 35 ADM63 _ _ _ 34 ADM63 _ _ _ 33 ADM63 _ _ _ 32 ADM63 _ _ _ 31 ADM63 _ _ _ 30 ADM63 _ _ _ 29 ADM63 _ _ _ 28 ADM63 _ _ _ 27 ADM63 _ _ _ 26 ADM63 _ _ _ 25 Min 4.925 4.827 4.728 4.630 4.561 4.433 4.314 4.236 4.137 4.039 3.940 3.842 3.743 3.645 3.546 3.448 3.349 3.251 3.152 3.034 2.955 2.886 2.758 2.660 2.591 2.463 TA = +25C Typ 5.000 4.900 4.800 4.700 4.630 4.500 4.390 4.300 4.200 4.100 4.00 3.900 3.800 3.700 3.600 3.500 3.400 3.300 3.200 3.080 3.000 2.930 2.800 2.700 2.630 2.500 Max 5.075 4.974 4.872 4.771 4.699 4.568 4.446 4.365 4.263 4.162 4.060 3.959 3.857 3.756 3.654 3.553 3.451 3.350 3.248 3.126 3.045 2.974 2.842 2.741 2.669 2.538 TA = -40C to +85C Min Max 4.875 5.125 4.778 5.023 4.680 4.920 4.583 4.818 4.514 4.746 4.388 4.613 4.270 4.490 4.193 4.408 4.095 4.305 3.998 4.203 3.900 4.100 3.803 3.998 3.705 3.895 3.608 3.793 3.510 3.690 3.413 3.588 3.315 3.485 3.218 3.383 3.120 3.280 3.003 3.157 2.925 3.075 2.857 3.000 2.730 2.870 2.633 2.768 2.564 2.696 2.438 2.563
Table 6. Reset Timeout Options
Suffix A B C D Min 1 20 140 1.12 Typ 1.6 30 200 1.60 Max 2 40 280 2.24 Unit ms ms ms s
Table 7. Watchdog Timer Options
Suffix W X Y Z Min 4.3 71 1.12 17.9 Typ 6.3 102 1.6 25.6 Max 9.3 153 2.24 38.4 Unit ms ms s s
Table 8. Standard Models
Model ADM6316CY29ARJ ADM6316CY46ARJ ADM6318CY46ARJ ADM6319C46ARJ ADM6320CY29ARJ ADM6320CY46ARJ ADM6321CY46ARJ ADM6322C46ARJ Reset Threshold (V) 2.93 4.63 4.63 4.63 2.93 4.63 4.63 4.63 Minimum Reset Timeout (ms) 140 140 140 140 140 140 140 140 Typical Watchdog Timeout (s) 1.6 1.6 1.6 1.6 1.6 1.6 1.6 1.6
Rev. 0 | Page 9 of 12
ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/ADM6321/ADM6322
CIRCUIT DESCRIPTION
The ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/ ADM6321/ADM6322 provide microprocessor supply voltage supervision by controlling the microprocessor's reset input. Code execution errors are avoided during power-up, powerdown, and brownout conditions by asserting a reset signal when the supply voltage is below a preset threshold and by allowing supply voltage stabilization with a fixed-timeout reset pulse after the supply voltage rises above the threshold. In addition, problems with microprocessor code execution can be monitored and corrected with a watchdog timer (ADM6316/ADM6317/ ADM6318/ADM6320/ADM6321). If the user detects a problem with the system's operation, a manual reset input is available (ADM6316/ADM6317/ADM6319/ADM6320/ADM6322) to reset the microprocessor by means of an external push-button, for example.
MANUAL RESET INPUT
The ADM6316/ADM6317/ADM6319/ADM6320/ADM6322 feature a manual reset input (MR) which, when driven low, asserts the reset output. When MR transitions from low to high, reset remains asserted for the duration of the reset active timeout period before deasserting. The MR input has a 52 k internal pull-up so that the input is always high when unconnected. An external push-button switch can be connected between MR and ground so that the user can generate a reset. Debounce circuitry for this purpose is integrated on-chip. Noise immunity is provided on the MR input, and fast, negative-going transients of up to 100 ns (typ) are ignored. A 0.1 F capacitor between MR and ground provides additional noise immunity.
WATCHDOG INPUT
The ADM6316/ADM6317/ADM6318/ADM6320/ADM6321 feature a watchdog timer, which monitors microprocessor activity. A timer circuit is cleared with every low-to-high or high-to-low logic transition on the watchdog input pin (WDI), which detects pulses as short as 50 ns. If the timer counts through the preset watchdog timeout period (tWD), reset is asserted. The microprocessor is required to toggle the WDI pin to avoid being reset. Failure of the microprocessor to toggle WDI within the timeout period, therefore, indicates a code execution error, and the reset pulse generated restarts the microprocessor in a known state. As well as logic transitions on WDI, the watchdog timer is also cleared by a reset assertion due to an undervoltage condition on VCC or due to MR being pulled low. When reset is asserted, the watchdog timer is cleared and does not begin counting again until reset deassserts. The watchdog timer can be disabled by leaving WDI floating or by three-stating the WDI driver.
VCC VCC 1V 0V VCC VTH
RESET OUTPUT
The ADM6316 features an active-low, push-pull reset output, while the ADM6317/ADM6321/ADM6322 have active-high push-pull reset outputs. The ADM6318/ADM6319 feature dual active-low and active-high push-pull reset outputs. For activelow and active-high outputs, the reset signal is guaranteed to be logic low and logic high, respectively, for VCC down to 1 V. The reset output is asserted when VCC is below the reset threshold (VTH), when MR is driven low, or when WDI is not serviced within the watchdog timeout period (tWD). Reset remains asserted for the duration of the reset active timeout period (tRP) after VCC rises above the reset threshold, after MR transitions from low-to-high, or after the watchdog timer times out. Figure 16 illustrates the behavior of the reset outputs.
VCC VCC 1V 0V VCC RESET 0V
04533-0-019
VTH
VTH
tRP
VCC
tRD
RESET
Figure 16. Reset Timing Diagram
WDI
VCC 0V
OPEN-DRAIN RESET OUTPUT
The ADM6320/ADM6321/ADM6322 have an active-low opendrain reset output. This output structure requires an external pull-up resistor to connect the reset output to a voltage rail no higher than 6 V. The resistor should comply with the microprocessor's logic low and logic high voltage level requirements while supplying input current and leakage paths on the RESET line. A 10 k resistor is adequate in most situations.
Figure 17. Watchdog Timing Diagram
Rev. 0 | Page 10 of 12
04533-0-022
1V 0V
tRP
RESET
tRD
tRP
0V
tWD
tRD
ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/ADM6321/ADM6322
APPLICATION INFORMATION
WATCHDOG INPUT CURRENT
In order to minimize watchdog input current (and minimize overall power consumption), leave WDI low for the majority of the watchdog timeout period. When driven high, WDI can draw as much as 160 A. Pulsing WDI low-high-low at a low duty cycle reduces the effect of the large input current. When WDI is unconnected, a window comparator disconnects the watchdog timer from the reset output circuitry so that reset is not asserted when the watchdog timer times out.
WATCHDOG SOFTWARE CONSIDERATIONS
In implementing the microprocessor's watchdog strobe code, quickly switching WDI low-high and then high-low (minimizing WDI high time) is desirable for current consumption reasons. However, a more effective way of using the watchdog function can be considered. A low-high-low WDI pulse within a given subroutine prevents the watchdog timing out. However, if the subroutine becomes stuck in an infinite loop, the watchdog cannot detect this because the subroutine continues to toggle WDI. A more effective coding scheme for detecting this error involves using a slightly longer watchdog timeout. In the program that calls the subroutine, WDI is set high. The subroutine sets WDI low when it is called. If the program executes without error, WDI is toggled high and low with every loop of the program. If the subroutine enters an infinite loop, WDI is kept low, the watchdog times out, and the microprocessor is reset.
START
NEGATIVE-GOING VCC TRANSIENTS
To avoid unnecessary resets caused by fast power supply transients, the ADM6316/ADM6317/ADM6318/ADM6319/ ADM6320/ADM6321/ADM6322 are equipped with glitch rejection circuitry. The typical performance characteristic in Figure 13 plots VCC transient duration vs. the transient magnitude. The curves show combinations of transient magnitude and duration for which a reset is not generated for 4.63 V and 2.93 V reset threshold parts. For example, with the 2.93 V threshold, a transient that goes 100 mV below the threshold and lasts 8 s typically does not cause a reset, but if the transient is any bigger in magnitude or duration, a reset is generated. An optional 0.1 F bypass capacitor mounted close to VCC provides additional glitch rejection.
SET WDI HIGH
RESET
PROGRAM CODE INFINITE LOOP: WATCHDOG TIMES OUT
ENSURING RESET VALID TO VCC = 0 V
Both active-low and active-high reset outputs are guaranteed to be valid for VCC as low as 1 V. However, by using an external resistor with push-pull configured reset outputs, valid outputs for VCC as low as 0 V are possible. For an active-low reset output, a resistor connected between RESET and ground pulls the output low when it is unable to sink current. For the activehigh case, a resistor connected between RESET and VCC pulls the output high when it is unable to source current. A large resistance such as 100 k should be used so that it does not overload the reset output when VCC is above 1 V.
VCC VCC
RESET RESET
SUBROUTINE SET WDI LOW
RETURN
Figure 19. Watchdog Flow Diagram
VCC
100k
RESET
04533-0-018
Figure 20. Typical Application Circuit
Figure 18. Ensuring Reset Valid to VCC = 0 V
Rev. 0 | Page 11 of 12
04533-0-020
ADM6316/ ADM6318/ ADM6319
RESET
ADM6317/ ADM6318/ ADM6319/ ADM6321/ ADM6322
100k
ADM6316
MR WDI I/O
P
04533-0-021
ADM6316/ADM6317/ADM6318/ADM6319/ADM6320/ADM6321/ADM6322
OUTLINE DIMENSIONS
2.90 BSC
5 4
1.60 BSC
1
2.80 BSC
2 3
PIN 1 0.95 BSC 1.30 1.15 0.90 1.90 BSC
1.45 MAX
0.22 0.08 10 5 0 0.60 0.45 0.30
0.15 MAX
0.50 0.30
SEATING PLANE
COMPLIANT TO JEDEC STANDARDS MO-178AA
Figure 21. 5-Lead Small Outline Transistor Package
ORDERING GUIDE
ADM63_ _ _ _ARJ-_
GENERIC NUMBER (16-22) RESET TIMEOUT PERIOD A: 1ms (TYP) B: 20ms (TYP) C: 140s (TYP) D: 1120s (TYP) ORDERING QUANTITY RL7: 3,000 PIECE REEL PACKAGE CODE RJ: 5-LEAD SOT-23 WATCHDOG TIMEOUT PERIOD W: 6.3ms (TYP) X: 102ms (TYP) Y: 1.6s (TYP) Z: 25s (TYP) TEMPERATURE RANGE A: -40C TO +85C RESET THRESHOLD NUMBER (25 TO 50)
Figure 22. Ordering Code Structure
Model1,2 ADM6316 _ _ __ ARJ-RL7 ADM6317 _ _ __ ARJ-RL7 ADM6318 _ _ __ ARJ-RL7 ADM6319 _ __ ARJ-RL7 ADM6320 _ _ __ ARJ-RL7 ADM6321 _ _ __ ARJ-RL7 ADM6322 _ __ ARJ-RL7
Temperature Range -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C
Quantity3 3k 3k 3k 3k 3k 3k 3k
Package Option SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5 SOT-23-5
04533-0-023
Branding N00 N01 N02 N03 N04 N05 N06
1
Complete the ordering code by inserting reset timeout, watchdog timeout (ADM6316/ADM6317/ADM6318/ADM6320/ADM6321), and reset threshold suffixes from Table 5 to Table 7. No watchdog timeout for ADM6319/ADM6322. 2 Contact Sales for the availability of nonstandard models. See Table 8 for a list of standard models. 3 A minimum of 12k (4 reels) must be ordered.
(c) 2004 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D04533-0-10/04(0)
Rev. 0 | Page 12 of 12
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