1
Data Sheet
STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345
µµµµµP Supervisor Circuits
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------
STC
Ver1.0
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
Suffix: X -- Monitored Voltage
Suffix X
L
M
T
S
R
Z
Y
Reset threshold (V)
4.63
4.38
3.08
2.93
2.63
2.32
2.20
RESET output
Part No.
Push-Pull
Open-Drain
RESET
output
(push-pull)
Manual Reset
Input
Power Fail
Detector
(1.25V)
Watchdog
Input
Package
1
STC803X
-
√
-
-
-
-
2
STC809X
√
-
-
-
-
-
3
STC810X
-
-
√
-
-
-
SOT23-3
4
STC811X
√
-
-
√
-
-
5
STC812X
-
-
√
√
-
-
6
STC823X
√
-
-
√
-
√
7
STC824X
√
-
√
-
-
√
8
STC825X
√
-
√
√
-
-
SOT23-5
9
STC6342X
√
-
-
√
√
-
10
STC6343X
-
√
-
√
√
-
11
STC6344X
-
-
√
√
√
-
12
STC6345X
√
-
√
-
√
-
SOT23-6