STC634 Datasheet PDF - ETC

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STC634
ETC

Part Number STC634
Description (STCxxx) UP Supervisor Circuits
Page 13 Pages


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Data Sheet
STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345
µP Supervisor Circuits
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Features
Introduction
• 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
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.
1 STC803X
2 STC809X
3 STC810X
4 STC811X
5 STC812X
6 STC823X
7 STC824X
8 STC825X
9 STC6342X
10 STC6343X
11 STC6344X
12 STC6345X
RESET output
Push-Pull
-
-
-
-
-
Open-Drain
-
-
-
-
-
-
-
-
-
-
RESET
output
(push-pull)
-
-
-
-
-
-
Manual Reset
Input
-
-
-
-
-
Power Fail
Detector
(1.25V)
-
-
-
-
-
-
-
-
Watchdog
Input
-
-
-
-
-
-
-
-
-
-
Package
SOT23-3
SOT23-5
SOT23-6
Suffix: X -- Monitored Voltage
Suffix X
LM
T
S
R
Z
Y
Reset threshold (V) 4.63 4.38 3.08 2.93 2.63 2.32 2.20
STC 1 Ver1.0



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Data Sheet
STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345
µP 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



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Data Sheet
STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345
µP Supervisor Circuits
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Block Diagram
Figure 1. Block Diagram
WDI
MR
Vcc
PFI
Watchdog
Transition Detector
V cc
Watchdog Timer
Timebase for Reset
& Watchdog
Reset Generator
VRST
1.25V
RESET
(RESET)
PFO
STC 3 Ver1.0



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Data Sheet
STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345
µP Supervisor Circuits
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Marking Information
123 4
Code
12
3
4
Descr iption
Part Number
Year
Work Week
Part Number Code
Code 1 2
Part No.
AA STC809L
AB STC809M
AC STC809T
AD STC809S
AE STC809R
AF STC809Z
AG STC809Y
AH STC810L
AI STC810M
AJ STC810T
AK STC810S
AL STC810R
AM STC810Z
AN STC810Y
AO STC811L
AP STC811M
AQ STC811T
AR STC811S
AS STC811R
AT STC811Z
AU STC811Y
AV STC812L
AW STC812M
AX STC812T
AY STC812S
AZ STC812R
BA STC812Z
BB 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



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