STC6344Z [ETC]
UP Supervisor Circuits; UP监控电路
| 型号： | STC6344Z |
| 厂家： | 
ETC |
| 描述： | UP Supervisor Circuits |
| 文件： | 总13页 (文件大小：110K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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)
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.
- 4.38V (STC8xxM, STC634xM)
- 3.08V (STC8xxT, STC634xT)
- 2.93V (STC8xxS, STC634xS)
- 2.63V (STC8xxR, STC634xR)
- 2.32V (STC8xxZ, STC634xZ)
The main functions are:
- 2.20V (STC8xxY, STC634xY)
• 200ms reset pulse width
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;
• Debounced CMOS-compatible manual-reset input
(811, 812, 823, 825, 6342-6344)
• Reset Output Signal for Watchdog and Power
Abnormal, Manual Reset
4. Manual reset.
• Reset Push-Pull output (STC809,811,823,
824,825,6342,6345)
Applications
• Reset Open-Drain output (STC803/6343)
• Voltage monitor for power-fail or low battery warning
• Guaranteed RESET/RESET valid at VCC = 1.0V
• Power-supply circuitry in µP systems
Ordering Information
RESET
output
(push-pull)
Power Fail
Detector
(1.25V)
RESET output
Manual Reset
Input
Watchdog
Input
Part No.
Package
Push-Pull
Open-Drain
-
-
STC803X
STC809X
STC810X
STC811X
STC812X
STC823X
STC824X
STC825X
STC6342X
STC6343X
STC6344X
STC6345X
-
√
-
-
-
-
-
-
-
1
2
3
4
5
6
7
8
9
√
-
SOT23-3
-
-
-
-
√
-
-
-
-
√
-
√
√
√
-
-
-
-
√
-
-
-
SOT23-5
SOT23-6
√
√
√
√
-
√
√
-
-
-
√
√
-
-
-
√
√
√
√
-
-
√
√
√
√
-
-
-
10
11
12
√
-
-
-
√
√
-
-
√
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
STC
Ver1.0
1
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
Ver1.0
2
Data Sheet
STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345
µP Supervisor Circuits
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Block Diagram
Figure 1. Block Diagram
Watchdog
Transition Detector
Watchdog Timer
WDI
V
cc
Timebase for Reset
& Watchdog
MR
Vcc
RESET
Reset Generator
(RESET)
V
RST
PFI
PFO
1.25V
STC
Ver1.0
3
Data Sheet
STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345
µP Supervisor Circuits
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Marking Information
Code
1 2
3
Description
Part Number
Year
1 2 3
4
4
Work Week
Part Number Code
Code 1 2
Part No.
Code 1 2
BC
BD
BE
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
Part No.
AA
AB
AC
AD
AE
AF
AG
AH
AI
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
CE
CF
CG
CH
CI
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
BF
BG
BH
BI
CJ
CK
CL
CM
CN
CO
CP
CQ
CR
CS
CT
CU
CV
CW
CX
CY
CZ
DA
DB
DC
DD
DE
DF
BJ
BK
BL
AJ
BM
BN
BO
BP
AK
AL
AM
AN
AO
AP
AQ
AR
AS
AT
AU
AV
AW
AX
AY
AZ
BA
BB
BQ
BR
BS
BT
BU
BV
BW
BX
BY
BZ
CA
CB
CC
CD
STC
Ver1.0
4
Data Sheet
STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345
µP Supervisor Circuits
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Pin Information
Pin Configuration
Figure 2. Pin Configuration
SOT23-3
S T C 8 0 3
S T C 8 0 9
S T C 8 1 0
1
G N D
1
G N D
3
3
V C C
V C C
2
R E S E T
2
R E S E T
SOT23-5
S T C 8 1 1
S T C 8 1 2
1
2
3
5
4
1
5
4
G N D
G N D
N C
V C C
V C C
2
N C
3
R E S E T
M R
R E S E T
M R
S T C 8 2 3
S T C 8 2 4
S T C 8 2 5
1
5
4
5
4
1
5
4
R E S E T
1
R E S E T
R E S E T
V C C
W D I
V C C
W D I
V C C
2
3
G N D
M R
G N D
2
3
G N D
2
3
R E S E T
R E S E T
M R
SOT23-6
S T C 6 3 4 2
S T C 6 3 4 3
S T C 6 3 4 4
S T C 6 3 4 5
1
V C C
G N D
PFI
R E S E T
6
1
V C C
G N D
PFI
R E S E T
6
1
V C C
G N D
PFI
R E S E T
R E S E T
P F O
6
2
3
M R
5
4
2
3
M R
5
4
2
3
5
4
P F O
P F O
STC
Ver1.0
5
Data Sheet
STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345
µP Supervisor Circuits
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Pin Description
Table 2. Pin Description
Pin Name
MR
Type
I
Description
Manual-Reset: (CMOS). 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 Supply: 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
Vcc
Power
Period (tRS) once VCC rises above VRST
.
GND
PFI
Ground
I
Ground Reference for all signals
Power-Fail Voltage Monitor Input. When PFI <VPFT , PFO goes low. Connect PFI to GND or Vcc
when not used.
Power-Fail Output: it gets low and sinks current when PFI is less than 1.25V; otherwise PFO stays
high.
PFO
WDI
O
I
Watchdog Input (CMOS). If WDI remains high or low for the duration of the watchdog timeout period
(tWD), the internal watchdog timer trigger a reset output. Floating WDI or connecting WDI to a high-
impedance three-state buffer disables the watchdog feature. The internal watchdog timer clears
whenever reset is asserted or WDI occurs a rising or falling edge.
Active-Low Reset Output (Push-Pull or Open-Drain). It goes low when Vcc is below the reset
threshold. It remains low for about 200ms after one of the following occurs: Vcc rises above the reset
threshold (VRST), the watchdog triggers a reset, or MR goes from low to high.
RESET
O
RESET
NC
O
-
The inverse of RESET, active high. Whenever RESET is high, RESET is low.
No connection
STC
Ver1.0
6
Data Sheet
STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345
µP Supervisor Circuits
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Watchdog Timer
Functional Description
The STC823/824 watchdog circuit monitors the µP’s activity. If
the µP does not toggle the watch-dog input (WDI) within 1.6s,
Reset Output
reset asserts. As long as reset is asserted or the WDI input is
A microprocessor’s (µP’s) reset input starts the µP in a known
toggled, the watchdog timer will stay clear and will not count.
state. Whenever the µP is in an unknown state, it should be
As soon as reset is released, the timer will start counting. WDI
held in reset. The supervisory circuits assert reset during power-
input pulses as short as 50ns can be detected.
up and prevent code execution errors during power-down or
Disable the watchdog function by leaving WDI unconnected
brownout conditions.
or by three-stating driver connected to WDI.
On power-up, once Vcc reaches about 1.0V, RESET is a
guaranteed logic low of 0.4V or less.AsVcc rises, RESET stays
Manual Reset
low.WhenVcc rises above the reset threshold, an internal timer
The manual-reset input (MR) allows reset to be triggered by a
releases RESET after about 200ms. RESET pulses low whenever
push button switch. MR has an internal pullup resistor, so it
Vcc drops below the reset threshold, i.e. brownout condition.
can be left open when not used.
If brownout occurs in the middle of a previously initiated reset
pulse, the pulse continues for at least another 200ms. On power-
Power-Fail Comparator
down, 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 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.
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
DC Linear
Regulator
IN
µP
Vcc
RESET
I/O Line
Interrupt
Vcc
RESET
P
Supervisory
µ
Circuit
PFI
MR
WDI
PFO
STC
Ver1.0
7
Data Sheet
STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345
µP Supervisor Circuits
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Detailed Specifications
Absolute Maximum Ratings
Note:
Storage Temperature .......................................................-65oC to +150oC
Stresses greater than those listed under MAXIMUM
Ambient Temperature with Power Applied ....................... -40oC to +85oC
RATINGS may cause permanent damage to the
Supply Voltage to Ground Potential (Vcc to GND) ........... -0.3V to +7.0V
device. This is a stress rating only and functional
DC Input Voltage (All inputs except Vcc and GND) ..... -0.3VtoVCC+0.3V operation of the device at these or any other condi-
tions above those indicated in the operational sec-
tions of this specification is not implied. Exposure
to absolute maximum rating conditions for ex-
tended periods may affect reliability.
DC Output Current (All outputs) .................................................... 20mA
Power Dissipation........................................................................ 320mW
(Depend on package)
Recommended Operation Condition
Table 3. DC Electrical Characteristics
Sym
Description
Supply Voltage for
Test Conditions
Min
4.5
Typ
5.0
3.3
3.0
2.5
Max
5.5
Unit
V
xL, xxxM
Supply Voltage for xxT, xxxS
Supply Voltage for xxxR
3.0
5.5
V
VCC
2.7
5.5
V
Supply Voltage for
xZ, xxxY
2.4
5.5
V
VIH
VIL
TA
Input High Voltage
0.7VCC
V
Input Low Voltage
0.3VCC
85
V
Operating Temperature
-40
OC
STC
Ver1.0
8
Data Sheet
STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345
µP 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
Description
Test Conditions
Min
Typ
Max
Unit
VCC
Operating Voltage Range
1.0
5.5
V
ICC
VIH
VIL
Supply Current
Vcc = 5V, No load
20
50
µA
V
Input High Voltage
Input Low Voltage
Pin: MR, WDI
Pin: MR, WDI
0.7 Vcc
0.3 Vcc
V
VRN-2.5%
4.514
4.271
3.003
2.857
2.564
2.262
2.145
VRN
VRN+2.5%
4.746
4.490
3.157
3.003
2.696
2.378
2.255
STCxxxL
STCxxxM
STCxxxT
4.63
4.38
3.08
2.93
2.63
2.32
2.20
Reset Threshold Voltage
(Note 1)
VRST
V
TA= -40 ~ 85”C STCxxxS
STCxxxR
STCxxxZ
STCxxxY
Reset Threshold
Hysteresis(Note 1)
VRTH
70
mV
V
Vcc varies between VRN±5%
Vcc-1.5
0.8 Vcc
0.8 Vcc
Vcc ≥ 4.5V Isource=800µA
Vcc ≥ 2.7V Isource=500µA
Vcc ≥ 1.8V Isource=150µA
Vcc ≥ 4.5V Isink=3.2mA
Vcc ≥ 2.7V Isink=1.2mA
Vcc ≥ 1.2V Isink=100µA
VOH
Output High Voltage
Output Low Voltage
0.4
0.3
0.3
VOL
V
Open-Drain Output
Leakage Current
VCC > VTH(MAX)
for STC803 and STC6343
ILKG
VPFT
IPFI
1
µA
V
PFI Input Threshold
VPFI varies from 1.5V and 1.0V
1.20
1.25
1.30
±25
160
PFI Input Leakage
Current
nA
WDI connected to VCC: 5.5V
WDI connected to GND
STC811/7812
120
-15
20
Average WDI Input
Current (Note 2)
IWDI
µA
kΩ
-20
10
35
60
30
75
MR pull-up resistor
(internal)
STC823/824/825
52
r
STC6342/6343/6344
* 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.
STC
Ver1.0
9
Data Sheet
STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345
µP Supervisor Circuits
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------
AC Electrical Characteristics
Table 5. AC Electrical Characteristics
Sym
tRS
Description
Test Conditions
Min
140
Typ
200
Max
280
Units
ms
Reset Pulse Width
MR from low to High
WDI and MR tied to VCC,
VCC > VRN + 5%
tWD
Watchdog Timeout Period
1.12
1
1.6
2.25
s
tMR
tMD
tWP
MR Pulse Width
MR to RESET Delay
WDI Pulse Width
µs
ns
ns
VCC = 5.0V
250
50
Figure 4. Watchdog Timing Diagram
V RST
V RST
V C C
tRS
tRS
tW D
tRS
R E SE T
R E SE T
tW P
tM D
W D I
M R
tM R
STC
Ver1.0
10
Data Sheet
STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345
µP Supervisor Circuits
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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
0o - 10o
Datum “A”
0.004 0.10
0.023 0.60
0037
0.95
BSC
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
STC
Ver1.0
11
Data Sheet
STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345
µP Supervisor Circuits
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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
0o - 10o
Datum “A”
0.004 0.10
0.023 0.60
0037
0.95
BSC
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
STC
Ver1.0
12
Data Sheet
STC803/809/810-811/812/-823/824/825-6342/6343/6344/6345
µP Supervisor Circuits
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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
0o - 10o
Datum “A”
0.004 0.10
0.023 0.60
0037
0.95
BSC
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
STC
Ver1.0
13
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