Data Sheet
STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345
µ
P Supervisor Circuits
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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 V
CC
= 1.0V
Introduction
The STCxxx family microprocessor (µP)
supervisory circuits are targeted to improve reliability
and accuracy of power-supply circuitry in µP 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, power-
down and brownout conditions for µP 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 µP 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
Ver1.0
1
Data Sheet
STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345
µ
P Supervisor Circuits
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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
STC
2
Ver1.0
Data Sheet
STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345
µ
P Supervisor Circuits
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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
STC
3
Ver1.0
Data Sheet
STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345
µ
P Supervisor Circuits
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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
4
Ver1.0
Data Sheet
STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345
µ
P Supervisor Circuits
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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
STC
5
Ver1.0
