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Data Sheet STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345 P Supervisor Circuits
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Features
* Precision supply-voltage monitor - 4.63V (STC8xxL, STC634xL) - 4.38V (STC8xxM, STC634xM) - 3.08V (STC8xxT, STC634xT) - 2.93V (STC8xxS, STC634xS) - 2.63V (STC8xxR, STC634xR) - 2.32V (STC8xxZ, STC634xZ) - 2.20V (STC8xxY, STC634xY) * 200ms reset pulse width * Debounced CMOS-compatible manual-reset input (811, 812, 823, 825, 6342-6344) * Reset Output Signal for Watchdog and Power Abnormal, Manual Reset * Reset Push-Pull output (STC809,811,823, 824,825,6342,6345) * Reset Open-Drain output (STC803/6343) * Voltage monitor for power-fail or low battery warning * Guaranteed RESET/RESET valid at VCC = 1.0V
Introduction
The STCxxx family microprocessor (P) supervisory circuits are targeted to improve reliability and accuracy of power-supply circuitry in P systems. These devices reduce the complexity and number of components required to monitor power-supply and battery functions. The main functions are: 1. Asserting reset output during power-up, powerdown and brownout conditions for P system; 2. Detecting power failure or low-battery conditions with a 1.25V threshold detector; 3. Watchdog functions; 4. Manual reset.
Applications
* Power-supply circuitry in P systems
Ordering Information
Part No. RESET output Push-Pull Open-Drain RESET output (push-pull) Manual Reset Input Power Fail Detector (1.25V) Watchdog Input Package
1 2 3 4 5 6 7 8 9 10 11 12
STC803X STC809X STC810X STC811X STC812X STC823X STC824X STC825X STC6342X STC6343X STC6344X STC6345X

SOT23-3
SOT23-5
SOT23-6
Suffix: X -- Monitored Voltage
Suffix X Reset threshold (V)
STC
L 4.63
M 4.38
T 3.08
S 2.93
R 2.63
Z 2.32
Y 2.20
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Data Sheet STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345 P Supervisor Circuits
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Contents
Features ....................................................................................................................................................... 1 Ordering Information .................................................................................................................................. 1 Introduction ................................................................................................................................................. 1 Block Diagram ............................................................................................................................................ 3 Marking Information ................................................................................................................................... 4 Pin Information ........................................................................................................................................... 5 Pin Configuration .............................................................................................................................. 5 Pin Description .................................................................................................................................. 6 Functional Description ................................................................................................................................ 7 Reset Output ...................................................................................................................................... 7 Watchdog Timer ................................................................................................................................ 7 Manual Reset ..................................................................................................................................... 7 Power-Fail Comparator ..................................................................................................................... 7 Recommended Operation Condition ................................................................................................. 8 Detailed Specifications ................................................................................................................................ 8 Absolute Maximum Ratings .............................................................................................................. 8 DC Electrical Characteristics ............................................................................................................. 9 AC Electrical Characteristics ........................................................................................................... 10 Mechanical Information ............................................................................................................................ 11 Notes ......................................................................................................................................................... 14
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Data Sheet STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345 P Supervisor Circuits
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Block Diagram
Figure 1. Block Diagram
WDI
Watchdog Transition Detector V cc
Watchdog Timer
Timebase for Reset & Watchdog
MR Reset Generator Vcc RESET (RESET)
V RST PFI 1.25V PFO
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Data Sheet STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345 P Supervisor Circuits
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Marking Information
C od e 12 Descr ip t ion Part Number Year Work Week
1
2
3
4
3 4
Part Number Code
Code 1 2 AA AB AC AD AE AF AG AH AI AJ AK AL AM AN AO AP AQ AR AS AT AU AV AW AX AY AZ BA BB Part No. STC809L STC809M STC809T STC809S STC809R STC809Z STC809Y STC810L STC810M STC810T STC810S STC810R STC810Z STC810Y STC811L STC811M STC811T STC811S STC811R STC811Z STC811Y STC812L STC812M STC812T STC812S STC812R STC812Z STC812Y Code 1 2 BC BD BE BF BG BH BI BJ BK BL BM BN BO BP BQ BR BS BT BU BV BW BX BY BZ CA CB CC CD Part No. STC803L STC803M STC803T STC803S STC803R STC803Z STC803Y STC823L STC823M STC823T STC823S STC823R STC823Z STC823Y STC824L STC824M STC824T STC824S STC824R STC824Z STC824Y STC825L STC825M STC825T STC825S STC825R STC825Z STC825Y Code 1 2 CE CF CG CH CI CJ CK CL CM CN CO CP CQ CR CS CT CU CV CW CX CY CZ DA DB DC DD DE DF Part No. STC6342L STC6342M STC6342T STC6342S STC6342R STC6342Z STC6342Y STC6343L STC6343M STC6343T STC6343S STC6343R STC6343Z STC6343Y STC6344L STC6344M STC6344T STC6344S STC6344R STC6344Z STC6344Y STC6345L STC6345M STC6345T STC6345S STC6345R STC6345Z STC6345Y
STC
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Data Sheet STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345 P Supervisor Circuits
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Pin Information
Pin Configuration
Figure 2. Pin Configuration
SOT23-3
STC803 STC809
GND
STC810
1 GND
1
VCC
3
VCC
3
2
RESET
2
RESET
SOT23-5 STC811
1 GND VCC 5
STC812
1 GND VCC 5
2
NC
2
NC
3
RESET
MR
4
3
RESET
MR
4
STC823
1 RESET VCC 5
STC824
1 RESET VCC 5 1
STC825
RESET VCC 5
2
GND
2
GND
2
GND
3
MR
WDI
4
3
RESET
WDI
4
3
RESET
MR
4
SOT23-6 STC6342 STC6343
1 VCC RESET 6 1
STC6344
VCC RESET 6 1
STC6345
VCC RESET 6
2
GND
MR
5
2
GND
MR
5
2
GND
RESET
5
3
PFI
PFO
4
3
PFI
PFO
4
3
PFI
PFO
4
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Data Sheet STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345 P Supervisor Circuits
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Pin Description
Table 2. Pin Description
P in Na me MR
Typ e I
Descr ip t ion Ma n u a l-R eset : (C MO S). Active low. Pull low to force a reset. Reset remains asserted for the duration of the Reset Timeout Period after MR transitions from low to high. Leave unconnected or connected to VCC if not used. Power Su p p ly: Reset is asserted when VCC drops below the Reset Threshold Voltage (VRST). Reset remains asserted until VCC rises above VRST and keep asserted for the duration of the Reset Timeout Period (tRS) once VCC rises above VRST. G r ou n d R efer en ce for all signals Power -Fa il Volt a ge Mon it or I n p u t . When PFI Vcc GND PFI PFO
Power Ground I O
WDI
I
RESET RESET NC
O O -
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Data Sheet STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345 P Supervisor Circuits
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Functional Description
Reset Output
A microprocessor's (P's) reset input starts the P in a known state. Whenever the P is in an unknown state, it should be held in reset. The supervisory circuits assert reset during powerup and prevent code execution errors during power-down or brownout conditions. On power-up, once Vcc reaches about 1.0V, RESET is a guaranteed logic low of 0.4V or less. As Vcc rises, RESET stays low. When Vcc rises above the reset threshold, an internal timer releases RESET after about 200ms. RESET pulses low whenever Vcc drops below the reset threshold, i.e. brownout condition. If brownout occurs in the middle of a previously initiated reset pulse, the pulse continues for at least another 200ms. On powerdown, once Vcc falls below the reset threshold, RESET stays low and is guaranteed to be 0.4V or less until Vcc drops below 1.0V. Fig 4 shows the timing relationship. The active-high RESET output is simply the inverse of the RESET output, and is guaranteed to be valid with Vcc down to 1.0V. Figure 3. Typical Application Circuit
Watchdog Timer
The STC823/824 watchdog circuit monitors the P's activity. If the P does not toggle the watch-dog input (WDI) within 1.6s, reset asserts. As long as reset is asserted or the WDI input is toggled, the watchdog timer will stay clear and will not count. As soon as reset is released, the timer will start counting. WDI input pulses as short as 50ns can be detected. Disable the watchdog function by leaving WDI unconnected or by three-stating driver connected to WDI.
Manual Reset
The manual-reset input (MR) allows reset to be triggered by a push button switch. MR has an internal pullup resistor, so it can be left open when not used.
Power-Fail Comparator
The power-fail comparator can be used for various purposes because its output and noninverting input are not internally connected. The inverting input is internally connected to a 1.25V reference.
IN
DC Linear Regulator P Vcc Vcc RESET P Supervisory Circuit PFI WDI PFO RESET I/O Line Interrupt
MR
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Data Sheet STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345 P Supervisor Circuits
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Detailed Specifications
Absolute Maximum Ratings
Storage Temperature ....................................................... -65oC to +150oC Ambient Temperature with Power Applied ....................... -40oC to +85oC Supply Voltage to Ground Potential (Vcc to GND) ........... -0.3V to +7.0V DC Input Voltage (All inputs except Vcc and GND) ..... -0.3V to VCC+0.3V DC Output Current (All outputs) .................................................... 20mA Power Dissipation ........................................................................ 320mW (Depend on package) Note: Stresses greater than those listed under MAXIMUM RATINGS may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability.
Recommended Operation Condition
Table 3. DC Electrical Characteristics
Sym
Descr ip t ion Supply Voltage for xxxL, xxxM Supply Voltage for xxT, xxxS
Test C on d it ion s
Min 4.5 3.0 2.7 2.4 0.7VCC
Typ 5.0 3.3 3.0 2.5
Ma x 5.5 5.5 5.5 5.5
Un it V V V V V
VCC
Supply Voltage for xxxR Supply Voltage for xxxZ, xxxY
VIH VIL TA
Input High Voltage Input Low Voltage Operating Temperature
0.3VCC -40 85
V
O
C
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Data Sheet STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345 P Supervisor Circuits
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DC Electrical Characteristics
Table 4. DC Electrical Characteristics
(Vcc=VRN+5% to 5.5V, TA= -40~85"C, unless otherwise noted)
Symbol
VCC ICC VIH VIL
Description
Operating Voltage Range Supply Current Input High Voltage Input Low Voltage
Test Conditions
Min
1.0
Typ
Max
5.5
Unit
V A V
Vcc = 5V, No load Pin: MR, WDI Pin: MR, WDI STCxxxL STCxxxM STCxxxT STCxxxS STCxxxR STCxxxZ STCxxxY VRN-2.5% 4.514 4.271 3.003 2.857 2.564 2.262 2.145 0.7 Vcc
20
50
0.3 Vcc VRN 4.63 4.38 3.08 2.93 2.63 2.32 2.20 70 Vcc-1.5 0.8 Vcc 0.8 Vcc 0.4 0.3 0.3 1 1.20 1.25 1.30 25 VRN+2.5% 4.746 4.490 3.157 3.003 2.696 2.378 2.255
V
VRST
Reset Threshold Voltage (Note 1)
TA= -40 ~ 85"C
V
VRTH
Reset Threshold Hysteresis(Note 1) Output High Voltage
Vcc varies between VRN5% Vcc 4.5V Vcc 2.7V Vcc 1.8V Vcc 4.5V Vcc 2.7V Vcc 1.2V Isource=800A Isource=500A Isource=150A Isink=3.2mA Isink=1.2mA Isink=100A
mV
VOH
V
VOL
Output Low Voltage Open-Drain Output Leakage Current PFI Input Threshold PFI Input Leakage Current Average WDI Input Current (Note 2) MR pull-up resistor (internal)
V A V nA A
ILKG VPFT IPFI IWDI
VCC > VTH(MAX) for STC803 and STC6343 VPFI varies from 1.5V and 1.0V
WDI connected to VCC: 5.5V WDI connected to GND STC811/7812 -20 10 35 60
120 -15 20 52
160 30 75
r
STC823/824/825 STC6342/6343/6344
k
* Valid for both RESET and RESET. VRN is nominal reset threshold voltage. ** WDI is internally serviced within the watchdog period if WDI is left unconnected.
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Data Sheet STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345 P Supervisor Circuits
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AC Electrical Characteristics
Table 5. AC Electrical Characteristics
Sym tRS tWD tMR tMD tWP Descr ip t ion Reset Pulse Width Watchdog Timeout Period MR Pulse Width MR to RESET Delay WDI Pulse Width VCC = 5.0V 50 Test C on d it ion s MR from low to High WDI and MR tied to VCC, VCC > VRN + 5% Min 140 1.12 1 250 Typ 200 1.6 Ma x 280 2.25 Un it s ms s s ns ns
Figure 4. Watchdog Timing Diagram
V CC
V RST
V RST tR S tW D tR S tR S
RESET
RESET tW P tM D
WDI tM R
MR
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Data Sheet STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345 P Supervisor Circuits
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Mechanical Information
Figure 5. SOT23-3
0.075 1.90 BSC
0.059 1.50 0.068 1.75
0.102 2.60 0.118 3.00 Datum "A"
0o - 10o
0037 0.95 BSC
0.004 0.10 0.023 0.60 0.014 0.35 0.019 0.50
0.110 2.80 0.118 3.00
0.057 1.45 MAX SEATING PLANE 0.000 0.00 0.005 0.15 X.XX Denotes Dimensions X.XX In Millimeters
Notes: 1)Controlling dimensions in millimeters 2)Ref: EIAJ SC-74A 3)Foot length is measured at flat portion of foot, reference to Datum A
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Data Sheet STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345 P Supervisor Circuits
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Figure 6. SOT23-5
0.075 1.90 BSC
0.059 1.50 0.068 1.75
0.102 2.60 0.118 3.00 Datum "A"
0o - 10o
0037 0.95 BSC
0.004 0.10 0.023 0.60 0.014 0.35 0.019 0.50
0.110 2.80 0.118 3.00
0.057 1.45 MAX SEATING PLANE 0.000 0.00 0.005 0.15 X.XX Denotes Dimensions X.XX In Millimeters
Notes: 1)Controlling dimensions in millimeters 2)Ref: EIAJ SC-74A 3)Foot length is measured at flat portion of foot, reference to Datum A
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Data Sheet STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345 P Supervisor Circuits
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Figure 7. SOT23-6
0.075 1.90 BSC
0.059 1.50 0.068 1.75
0.102 2.60 0.118 3.00 Datum "A"
0o - 10o
0037 0.95 BSC
0.004 0.10 0.023 0.60 0.014 0.35 0.019 0.50
0.110 2.80 0.118 3.00
0.057 1.45 MAX SEATING PLANE 0.000 0.00 0.005 0.15 X.XX Denotes Dimensions X.XX In Millimeters
Notes: 1)Controlling dimensions in millimeters 2)Ref: EIAJ SC-74A 3)Foot length is measured at flat portion of foot, reference to Datum A
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