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5-pin supervisor with watchdog timer push-button reset
Precision monitoring 3.3, power supplies outputs (active-low, push-pull open drain) outputs (active-high, push-pull) Reset pulse width (typ)(a) Watchdog timeout period (typ)(a) Manual reset input (MR) supply current (typ) Guaranteed (RST) assertion down Operating temperature: +85°C (industrial grade) RoHS compliance Lead-free components compliant with RoHS directive Other trec watchdog timings offered. Minimum order quantities apply. Contact local sales office availability. Device summary
Reset output Part number Watchdog input Manual reset input Active-low (push-pull) Active-high (push-pull) Active-low (open drain)
SOT23-5 (WY)
Table
STM6321 STM6322 STM6821 STM6822 STM6823 STM6824 STM6825
June 2008
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Contents
Contents
Description
descriptions
1.1.1 1.1.2 1.1.3 1.1.4 1.1.5 Active-low, push-pull reset output (RST) STM6822/6823/6824/6825 Active-low, open drain reset output (RST) STM6321/6322/6822 Push-button reset input (MR) Watchdog input (WDI) Active-high reset output (RST)
Operation
Reset output Open drain output Push-button reset input (STM6322/6821/6822/6823/6825) Watchdog input (STM6321/6821/6822/6823/6824) Applications information
2.5.1 2.5.2 Watchdog input current Ensuring valid reset output down
Interfacing microprocessors with bidirectional reset pins
Typical operating characteristics Maximum ratings parameters Package mechanical data Part numbering Revision history
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List tables
List tables
Table Table Table Table Table Table Table Table Table Table Device summary Signal names functions Absolute maximum ratings Operating measurement conditions characteristic SOT23-5 5-lead small outline transistor package mechanical data. Ordering information scheme Marking description. Document revision history
3/28
List figures
List figures
Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Logic diagram (STM6821/6822/6823) Logic diagram (STM6321/6322/6824/6825) STM6822/6823 SOT23-5 connections STM6821 SOT23-5 connections STM6322/6825 SOT23-5 connections STM6321/6824 SOT23-5 connections Block diagram (STM6821/6822/6823) Block diagram (STM6321/6824) Block diagram (STM6322/6825) Hardware hookup STM6321/6322/6822 open drain output with multiple supplies Ensuring valid (active-low push-pull outputs). Ensuring valid (active-high, push-pull outputs) Interfacing microprocessors with bidirectional reset VCC-to-reset output delay temperature Supply current temperature. MR-to-reset output delay temperature Normalized power-up trec temperature Normalized reset threshold voltage temperature Normalized power-up watchdog time-out period Voltage output ISINK Voltage output high ISOURCE Maximum transient duration reset threshold overdrive testing input/output waveforms timing waveform Watchdog timing SOT23-5 5-lead small outline transistor package mechanical drawing
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Description
Description
STM6xxx supervisors self-contained devices which provide microprocessor supervisory functions. precision voltage reference comparator monitors input out-of-tolerance condition. When invalid condition occurs, reset output (RST) forced high case RST). These devices also offer watchdog timer (except STM6322/6825) and/or push-button (MR) reset input. These devices available standard 5-pin SOT23 package. Figure Logic diagram (STM6821/6822/6823)
STM6XXX (RST)(1)
AI09128
STM6821 only.
Figure
Logic diagram (STM6321/6322/6824/6825)
(WDI)
STM6XXX
AI09129
STM6321/6824.
Table
Signal names
Push-button reset input Watchdog input Active-low reset output Active-high reset output Supply voltage Ground
5/28
Description Figure
STM6822/6823 SOT23-5 connections
SOT23-5 RST(1)
AI09130a
Open drain STM6822.
Figure
STM6821 SOT23-5 connections
SOT23-5 RST(1)
AI12285
Push-pull only.
Figure
STM6322/6825 SOT23-5 connections
SOT23-5 RST(1) RST(2)
AI09131a
Open drain STM6322. Push-pull only.
Figure
STM6321/6824 SOT23-5 connections
SOT23-5 RST(1) RST(2)
AI12286
Open drain STM6321. Push-pull only.
6/28
Description
1.1.1
descriptions
Active-low, push-pull reset output (RST) STM6822/6823/6824/6825
Pulses when triggered, stays whenever below reset threshold when logic low. remains trec after either rises above reset threshold, watchdog triggers reset, goes from high.
1.1.2
Active-low, open drain reset output (RST) STM6321/6322/6822
Pulses when triggered, stays whenever below reset threshold when logic low. remains trec after either rises above reset threshold, watchdog triggers reset, goes from high. Connect pull-up resistor supply voltage.
1.1.3
Push-button reset input (MR)
logic asserts reset output. Reset remains asserted long trec after returns high. This active-low input internal pull-up. driven from CMOS logic line, shorted ground with switch. Leave open unused.
1.1.4
Watchdog input (WDI)
remains high least 1.6s, internal watchdog timer expires reset asserted. internal watchdog timer clears while reset asserted when sees rising falling edge. watchdog function disabled left unconnected connected tri-state buffer output.
1.1.5
Active-high reset output (RST)
Active-high, push-pull reset output; inverse RST. Table functions
STM6822 STM6823 STM6821 STM6321 STM6824 STM6322 STM6825 Active-low reset output Push-button reset input Watchdog Input Active-high reset output Supply voltage Ground Name Function
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Description
Figure
Block diagram (STM6821/6822/6823)
Transitional Detector WATCHDOG TIMER trec Generator
VRST
COMPARE
(RST)
(1,2)
AI09132a
Push-pull STM6823, open drain STM6822. Active-high (push-pull) STM6821.
Figure
Block diagram (STM6321/6824)
Transitional Detector WATCHDOG TIMER trec Generator RST(1) RST(2)
A12287
VRST
COMPARE
Active-low (open drain) STM6321, active-low (push-pull) STM6824. Push-pull only.
Figure
Block diagram (STM6322/6825)
VRST COMPARE RST(1) RST(2)
trec Generator
AI12288
Active-low (open drain) STM6322, active-low (push-pull) STM6825. Push-pull only.
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Description
Figure Hardware hookup
0.1F
STM6XXX
From Microprocessor
Push-button
(RST)
Microprocessor Reset Microprocessor Reset
AI09133
STM6321/6821/6822/6823/6824 STM6322/6821/6822/6823/6825 STM6821/ (RST output only) STM6321/6322/6824/6825 (both outputs)
9/28
Operation
Operation
Reset output
STM6xxx Supervisor asserts reset signal whenever goes below reset threshold (VRST), watchdog time-out occurs, when Push-button Reset Input (MR) taken low. Reset guaranteed valid VRST down 85°C. During power-up, once exceeds reset threshold internal timer keeps reset reset time-out period, trec. After this interval reset de-asserted. Each time asserted, stays least reset time-out period (trec). time goes below reset threshold internal timer clears. reset timer starts when returns above reset threshold.
Open drain output
STM6321/6322/6822 have active-low, open drain reset output. This output structure will sink current when asserted. Connect pull-up resistor from supply voltage (see Figure 11). Select resistor value large enough register logic low, small enough register logic high while supplying input current leakage paths connected reset output line. pull-up resistor sufficient most applications. Figure STM6321/6322/6822 open drain output with multiple supplies
3.3V 5.0V
STM6XXX MR(1) WDI(2) RST(3)
AI09137
System
STM6322/6822 STM6321/6822 STM6321/6322
10/28
Operation
Push-button reset input (STM6322/6821/6822/6823/6825)
logic asserts reset. Reset remains asserted while low, trec (see Figure page after returns high. input internal pull-up resistor, allowing left open used. This input driven with TTL/CMOS-logic levels with open-drain/collector outputs. Connect normally open momentary switch from create manual reset function; external debounce circuitry required. driven from long cables device used noisy environment, connect capacitor from provide additional noise immunity. float, tied when used.
Watchdog input (STM6321/6821/6822/6823/6824)
watchdog timer used detect out-of-control MCU. does toggle Watchdog Input (WDI) within (1.6 sec), reset asserted. internal watchdog timer cleared either: reset pulse, toggling (high-to-low low-to-high), which detect pulses short
timer remains cleared does count long reset asserted. soon reset released, timer starts counting. Note: watchdog function disabled floating tri-stating driver connected WDI. When tri-stated disconnected, maximum allowable leakage current maximum allowable load capacitance
2.5.1
Applications information
Watchdog input current
input internally driven through buffer series resistor from watchdog counter. minimum watchdog input current (minimum overall power consumption), leave majority watchdog time-out period. When high, draw much 160µA. Pulsing high duty cycle will reduce effect large input current. When left unconnected, watchdog timer serviced within watchdog time-out period low-high-low pulse from counter chain.
2.5.2
Ensuring valid reset output down
STM6xxx supervisors guaranteed operate properly down applications that require valid reset levels down pull-down resistor activelow outputs (push/pull only, Figure page pull-up resistor active-high outputs (push/pull only, Figure page will ensure that reset line valid while reset output longer sink source current. This scheme does work with open drain outputs STM6321/6322/6822. resistor value used critical, must large enough load reset output when above reset threshold. most applications, adequate.
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Operation
Figure Ensuring valid (active-low push-pull outputs)
STM6XXX
AI09138
Figure Ensuring valid (active-high, push-pull outputs)
STM6XXX
AI09139
This configuration does work open drain outputs STM6321/6322/6822.
Interfacing microprocessors with bidirectional reset pins
Microprocessors with bidirectional reset pins contend with STM6321 6322 6821 6822 6823 6824 6825 reset output. example, reset output driven high microprocessor wants pull low, signal contention will result. prevent this from occurring, connect resistor between reset output microprocessor's reset Figure Figure Interfacing microprocessors with bidirectional reset
Buffered Reset other System Components
STM6XXX 4.7k
Microprocessor
AI09135
12/28
Typical operating characteristics
Typical operating characteristics
Figure VCC-to-reset output delay temperature
Reset Output Delay (µs)
AI09627a
Temperature (°C)
Figure Supply current temperature
Supply Current (µA)
AI09628a
Temperature (°C)
13/28
Typical operating characteristics
Figure MR-to-reset output delay temperature
Reset Output Delay (ns)
AI09669
Temperature (°C)
Figure Normalized power-up trec temperature
1.05
Normalized Power-up trec
1.04 1.03 1.02 1.01 1.00 0.99
AI09670
Temperature (°C)
14/28
Typical operating characteristics
Figure Normalized reset threshold voltage temperature
1.05 1.04
Normalized Reset Threshold Voltage
1.03 1.02 1.01 1.00 0.99 0.98 0.97 0.96 0.95
AI09631a
Temperature (°C)
Figure Normalized power-up watchdog time-out period
Normalized Watchdog Time-out Period
1.05 1.04 1.03 1.02 1.01 1.00 0.99
AI09671
Temperature (°C)
15/28
Typical operating characteristics Figure Voltage output ISINK
0.35
0.30
0.25
VOUT
0.20
2.9V
0.15
0.10
0.05
0.00
AI09634a
ISINK (mA)
Figure Voltage output high ISOURCE
2.92 2.90 2.88 2.86
VOUT
2.84
2.9V
2.82 2.80 2.78 2.76 2.74
AI09635a
ISOURCE (mA)
16/28
Typical operating characteristics
Figure Maximum transient duration reset threshold overdrive
Transient Duration (µs)
AI09637a
Reset Threshold Overdrive (mV)
17/28
Maximum ratings
Maximum ratings
Stressing device above rating listed Table cause permanent damage device. These stress ratings only operation device these other conditions above those indicated operating sections this specification implied. Exposure absolute maximum rating conditions extended periods affect device reliability. Refer also STMicroelectronics SURE Program other relevant quality documents. Table
Symbol TSTG TSLD
Absolute maximum ratings
Parameter Storage temperature (VCC off) Lead solder temperature seconds Input output voltage Supply voltage Output current Power dissipation Value -0.3 -0.3 Unit
Reflow peak temperature 260°C (total thermal budget exceed 245°C greater than seconds).
18/28
parameters
parameters
This section summarizes operating measurement conditions, characteristics device. parameters characteristics tables that follow, derived from tests performed under measurement conditions summarized Table Designers should check that operating conditions their circuit match operating conditions when relying quoted parameters. Table Operating measurement conditions
Parameter supply voltage Ambient operating temperature (TA) Input rise fall times Input pulse voltages Input output timing ref. voltages STM6xxx 0.8VCC 0.7VCC Unit
Figure testing input/output waveforms
0.8VCC
0.7VCC 0.3VCC
AI02568
0.2VCC
Figure timing waveform
tMLRL
tMLMH
trec
AI07837a
STM6322/6821/6825.
Figure Watchdog timing
trec
AI09136
19/28
parameters Table
characteristic
Alternative Description Operating voltage supply current unconnected) T/S/R/Z/Y (VCC (VCC T/S/R/Z/Y (VCC (VCC VCC, time average GND, time average VRST, Reset asserted VRST VRST Input high voltage (WDI) Input voltage (MR) Input voltage (WDI)
Test condition
Unit
0.7VCC 0.7VCC
supply current unconnected; STM6322/6825) Input leakage current
Input leakage current (WDI)(3) Open drain reset output leakage current Input high voltage (MR)
VRST (max) VRST VRST VRST (max) ISINK Reset asserted ISINK Reset asserted ISINK Reset asserted ISINK Reset asserted ISINK Reset asserted ISINK Reset asserted
0.3VCC 0.3VCC
Output voltage (RST; push-pull open drain)
Output voltage (RST; push-pull only)
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Table
parameters
characteristic (continued)
Alternative Description Test condition ISOURCE Reset asserted Output high voltage (RST) ISOURCE Reset asserted ISOURCE Reset asserted (0°C 85°C) ISOURCE Reset asserted Unit
0.8VCC 0.8VCC 0.8VCC 0.8VCC
Output high voltage (RST)
2.55 ISOURCE 0.8VCC Reset asserted 4.25 ISOURCE 0.8VCC Reset asserted Reset Thresholds 25°C STM6xxxL 85°C 25°C STM6xxxM 85°C 25°C STM6xxxT 85°C VRST(5) 25°C Reset threshold STM6xxxS 85°C 25°C STM6xxxR 85°C 25°C STM6xxxZ 85°C 25°C STM6xxxY 85°C versions Reset threshold hysteresis T/S/R/Z/Y versions delay (VRST falling mV/µs) trec Reset pulse width Blank 1.950 2.050 2.243 1.970 2.000 2.358 2.030 2.564 2.266 2.300 2.696 2.335 2.857 2.590 2.630 3.000 2.660 3.000 2.890 2.930 3.150 2.960 4.270 3.040 3.080 4.490 3.110 4.514 4.314 4.390 4.746 4.446 4.561 4.630 4.699
21/28
parameters Table
characteristic (continued)
Alternative Description Reset threshold temperature coefficient Test condition Unit ppm/C
Push-button Reset Input tMLMH tMLRL tMRD pulse width output delay glitch immunity pull-up resistor Watchdog Timer Watchdog timeout period pulse width(7) 1.12 1.60 2.24
Valid ambient operating temperature: 85°C; "L/M" versions; "T/S/R" versions; 2.75 "Z/Y" version (except where noted). (min) +85°C. input designed driven three-state output device. float WDI, "high-impedance mode" output device must have maximum leakage current maximum output capacitance output device must also able source sink least when active. internally serviced within watchdog period left unconnected. leakage current measured tested with reset asserted (output high impedance). Other trec watchdog timings offered. Minimum order quantities apply. Contact local sales office availability. tWD(min)
22/28
Package mechanical data
Package mechanical data
order meet environmental requirements, offers these devices ECOPACK® packages. These packages have Lead-free second level interconnect. category second Level Interconnect marked package inner label, compliance with JEDEC Standard JESD97. maximum ratings related soldering conditions also marked inner label. ECOPACK trademark. ECOPACK specifications available www.st.com. Figure SOT23-5 5-lead small outline transistor package mechanical drawing
SOT23-5L
Drawing scale.
23/28
Package mechanical data Table
Symb 0.35 1.05 0.40 0.15 2.90 1.90 2.80 0.95 1.60 1.50 0.10 2.60 0.90 0.35 0.09 2.80 1.20 0.90
SOT23-5 5-lead small outline transistor package mechanical data
1.45 0.15 1.30 0.50 0.20 3.00 0.041 0.016 0.006 0.114 0.075 3.00 0.110 0.037 1.75 0.60 0.014 0.063 0.059 0.004 0.069 0.024 0.102 0.118 0.035 0.014 0.004 0.110 0.047 inches 0.035 0.057 0.006 0.051 0.020 0.008 0.118
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Part numbering
Part numbering
Table
Example: Device type STM6xxx Reset threshold voltage VRST 4.514 4.746 VRST 4.270 4.490 VRST 3.000 3.150 VRST 2.850 3.000 VRST 2.564 2.696 VRST 2.243 2.358 VRST 1.950 2.050 Reset pulse width trec Blank: trec trec Package SOT23-5 Temperature range 85°C Shipping method ECOPACK® package, tubes ECOPACK® package, tape reel
Ordering information scheme
STM6xxx
Contact local sales office availability. Other trec watchdog timings offered. Minimum order quantities apply. Contact local sales office availability.
other options, more information aspect this device, please contact sales office nearest you.
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Part numbering Table Marking description
Part number STM6321LWY6F STM6321MAWY6F STM6321MWY6F STM6321TWY6F STM6321SWY6F STM6321RWY6F STM6322LWY6F STM6322MWY6F STM6322TWY6F STM6322SWY6F STM6322RWY6F STM6821LWY6F STM6821MWY6F STM6821TWY6F STM6821SWY6F STM6821RWY6F STM6822LWY6F STM6822MWY6F STM6822TWY6F STM6822SWY6F STM6822RWY6F STM6822ZWY6F STM6822YWY6F STM6823LWY6F STM6823MWY6F STM6823TJWY6F STM6823TWY6F STM6823SJWY6F STM6823SWY6F STM6823RJWY6F STM6823RWY6F STM6824LWY6F STM6824MWY6F STM6824TWY6F STM6824SWY6F STM6824RWY6F STM6825LWY6F STM6825MWY6F STM6825TWY6F STM6825SWY6F STM6825RWY6F
Reset threshold 4.630 4.390 4.390 3.080 2.930 2.630 4.630 4.390 3.080 2.930 2.630 4.630 4.390 3.080 2.930 2.630 4.630 4.390 3.080 2.930 2.630 2.300 2.000 4.630 4.390 3.080 3.080 2.930 2.930 2.630 2.630 4.630 4.390 3.080 2.930 2.630 4.630 4.390 3.080 2.930 2.630
Reset pulse width (ms)
Topside marking 5AUx 5CRx 5AVx 5AWx 5AXx 5AYx 5BAx 5BBx 5BCx 5BDx 5BEx 5BGx 5BHx 5BJx 5BKx 5BLx 5BNx 5BPx 5BQx 5BRx 5BSx 5BTx 5CTx 5BUx 5BVx 5CMx 5BWx 5CNx 5BXx 5CPx 5BYx 5CAx 5CBx 5CCx 5CDx 5CEx 5CGx 5CHx 5CJx 5CKx 5CLx
Note:
Where assembly work week such that WW01-02, WW03-04, forth.
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Revision history
Revision history
Table
Date 25-Aug-2004 15-Dec-2004 10-Mar-2005 17-Jun-2005 11-Apr-2006 11-Aug-2006 25-May-2007 03-Jun-2008
Document revision history
Revision First draft Update characteristics (Figure Table Document promoted Datasheet status Package marking update (Table Update characteristics, Lead-free text, availability (Figure Table Update Description, Table Formatting changes, updated Table Updated cover page; updated reset threshold values Table addition text Section updated Figure Table minor text changes. Changes
27/28
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