STMICROELECTRONICS STM812RW16F

STM809, STM810
STM811, STM812
Reset Circuit
FEATURES SUMMARY
■
■
■
■
■
■
■
PRECISION MONITORING OF 3V, 3.3V, and
5V SUPPLY VOLTAGES
TWO OUTPUT CONFIGURATIONS
– Push-pull RST Output (STM809/811)
– Push-pull RST Output (STM810/812)
140ms RESET PULSE WIDTH (MIN)
LOW SUPPLY CURRENT - 6µA (TYP)
GUARANTEED RST/RST ASSERTION
DOWN TO VCC = 1.0V
OPERATING TEMPERATURE:
–40°C to 85°C (Industrial Grade)
LEAD-FREE, SMALL SOT23 and SOT143
PACKAGE
Figure 1. Packages
SOT23-3 (WX)
Table 1. Device Options
ActiveLow
RESET
STM809
Manual
RESET
Input
✔
✔
STM812
November 2004
Package
SOT23-3
✔
STM810
STM811
ActiveHigh
RESET
✔
SOT143-4 (W1)
SOT23-3
✔
SOT143-4
✔
SOT143-4
1/18
STM809/810/811/812
TABLE OF CONTENTS
FEATURES SUMMARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Table 1. Device Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Figure 1. Packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
SUMMARY DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Figure 2.
Figure 3.
Table 2.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Logic Diagram (STM809/810) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Logic Diagram (STM811/812) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Signal Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
SOT23-3 Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
SOT143-4 Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Hardware Hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Reset Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Push-Button Reset Input (STM811/812) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Negative-Going VCC Transients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Valid /RST Output Down to VCC = 0V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
TYPICAL OPERATING CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 8. Supply Current vs. Temperature, L/M/R/S/T (no load) . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 9. Power-down Reset Delay vs. Temperature - VOD = VTH – VCC (L/M). . . . . . . . . . . . . . . . 7
Figure 10.Power-down Reset Delay vs. Temperature - VOD = VTH – VCC (R/S/T) . . . . . . . . . . . . . . 8
Figure 11.Power-up trec vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 12.Normalized Reset Threshold vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 13.Max Transient Duration NOT Causing Reset Pulse vs. Reset Comparator Overdrive . . . 9
MAXIMUM RATING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Table 3. Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
DC and AC PARAMETERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Table 4. Operating and AC Measurement Conditions . . . . .
Figure 14.AC Testing Input/Output Waveforms. . . . . . . . . . .
Figure 15.MR Timing Waveform . . . . . . . . . . . . . . . . . . . . . .
Table 5. DC and AC Characteristics . . . . . . . . . . . . . . . . . .
......
......
......
......
.......
.......
.......
.......
......
......
......
......
......
......
......
......
. . . . 11
. . . . 11
. . . . 11
. . . . 12
PACKAGE MECHANICAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 16.SOT23-3 – 3-lead Small Outline Transistor Package Outline . . . . . . . . . . . . . . . . . . . . . 13
Table 6. SOT23-3 – 3-lead Small Outline Transistor Package Mechanical Data . . . . . . . . . . . . . 13
Figure 17.SOT143-4 – 4-lead Small Outline Transistor Package Outline . . . . . . . . . . . . . . . . . . . . 14
Table 7. SOT143-4 – 4-lead Small Outline Transistor Package Mechanical Data . . . . . . . . . . . . 14
PART NUMBERING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2/18
STM809/810/811/812
Table 8. Ordering Information Scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Table 9. Marking Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
REVISION HISTORY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Table 10. Document Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3/18
STM809/810/811/812
SUMMARY DESCRIPTION
The STM809/810/811/812 MICROPROCESSOR
RESET Circuits are low-power supervisory devices used to monitor power supplies. They perform
a single function: asserting a reset signal whenever the VCC supply voltage drops below a preset
value and keeping it asserted until VCC has risen
above the preset threshold for a minimum period
of time (trec). The STM811/812 also provide a
push-button reset input (MR).
Figure 2. Logic Diagram (STM809/810)
Table 2. Signal Names
VCC
RST (RST)(1)
STM809/810
VSS
Ground
RST
Active-Low RESET Output
RST(1)
Active-High RESET Output
VCC
Supply Voltage
MR(2)
Manual Reset Input
Note: 1. STM810/812 only
2. STM811/812 only
VSS
AI07832
Note: 1. For STM810
Figure 4. SOT23-3 Connections
VSS
RST (RST)
Figure 3. Logic Diagram (STM811/812)
VCC
1
2
3
VCC
(For STM810)
AI07833
Figure 5. SOT143-4 Connections
(1)
STM811/812
MR
RST (RST)
VSS
RST (RST)
1
2
4
3
VCC
MR
(For STM812)
VSS
AI07834
AI07831
Note: 1. For STM812
Figure 6. Block Diagram
VCC
VRST
COMPARE
trec
Generator
MR(1)
RST(2)
DEBOUNCE
AI07835
Note: 1. STM811/812 only
2. RST for STM810/812
4/18
STM809/810/811/812
Figure 7. Hardware Hookup
VCC
VCC
VCC
STM809/810/
811/812
MCU
MR(2)
RST(1)
Push-button
RESET
VSS
RESET
Input
VSS
AI07836
Note: 1. STM809/811 only (RST for STM810/812)
2. STM811/812 only
5/18
STM809/810/811/812
OPERATION
Reset Output
The STM809/810/811/812 MICROPROCESSOR
RESET CIRCUIT asserts a reset signal to the
MCU whenever VCC goes below the reset threshold (VRST), or when the push-button reset input
(MR) is taken low (see Figure 15., page 11). RST
(active high for STM810/812) is guaranteed valid
down to VCC = 1V (0° to 70°C).
During power-up, once VCC exceeds the reset
threshold an internal timer keeps RST low for the
reset time-out period, trec. After this interval, RST
returns high.
If VCC drops below the reset threshold, RST goes
low. Each time RST is asserted, it stays low for at
least the reset time-out period. Any time VCC goes
below the reset threshold, the internal timer clears.
The reset timer starts when VCC returns above the
reset threshold. The active-low reset (RST) and
active-high reset (RST) both source and sink current.
Push-Button Reset Input (STM811/812)
A logic low on MR asserts RST. RST remains asserted while MR is low, and for trec after it returns
high. The MR input has an internal 20kΩ pull-up
resistor, allowing it to be left open if not used. This
input can be driven with TTL/CMOS-logic levels or
with open-drain/collector outputs. Connect a normally open push-button switch from MR to GND to
create a manual reset function; external debounce
circuitry is not required. If the device is used in a
noisy environment, connect a 0.1µF capacitor
from MR to GND to provide additional noise immunity.
6/18
Negative-Going VCC Transients
The STM809/810/811/812 are relatively immune
to negative-going VCC transients (glitches). Figure
13., page 9 shows typical transient duration versus reset comparator overdrive (for which the
STM809/810/811/812 will NOT generate a reset
pulse). The graph was generated using a negative
pulse applied to VCC, starting at 0.5V above the
actual reset threshold and ending below it by the
magnitude indicated (comparator overdrive). The
graph indicates the maximum pulse width a negative VCC transient can have without causing a reset pulse. As the magnitude of the transient
increases (further below the threshold), the maximum allowable pulse width decreases. Any combination of duration and overdrive which lies under
the curve will NOT generate a reset signal. Typically, a VCC transient that goes 100mV below the
reset threshold and lasts 20µs or less will not
cause a reset pulse. A 0.1µF bypass capacitor
mounted as close as possible to the VCC pin provides additional transient immunity.
Valid /RST Output Down to VCC = 0V
When VCC falls below 1V, the RST (STM809/811)
output no longer sinks current, but becomes an
open circuit. In most systems this is not a problem,
as most MCUs do not operate below 1V. However,
in applications where RST output must be valid
down to 0V, a pull-down resistor may be added to
hold the RST output low. This resistor must be
large enough to not load the RST output, and still
be small enough to pull the output to ground. A
100KΩ resistor is recommended.
Note: The same situation applies for the activehigh RST of the STM810/812. A 100KΩ pull-up resistor to VCC should be used if RST must remain
valid for VCC < 1.0V.
STM809/810/811/812
TYPICAL OPERATING CHARACTERISTICS
Note: Typical values are at TA = 25°C, VCC = 5V for L/M versions, VCC = 3.3V for T/S versions, and VCC =
3.0V for R versions.
Figure 8. Supply Current vs. Temperature, L/M/R/S/T (no load)
8.0
Supply Current (µA)
6.0
1V
3V
3.6V
5.5V
4.0
2.0
0.0
–40
–20
0
20
40
60
80
Temperature (˚C)
AI07879
Figure 9. Power-down Reset Delay vs. Temperature - VOD = VTH – VCC (L/M)
Power-Down Reset Delay (µs)
140.00
120.00
100.00
VOD = 20mV
VOD = 125mV
VOD = 200mV
80.00
60.00
40.00
20.00
0.00
–40
–20
0
20
Temperature (˚C)
40
60
80
AI07880
7/18
STM809/810/811/812
Figure 10. Power-down Reset Delay vs. Temperature - VOD = VTH – VCC (R/S/T)
Power-Down Reset Delay (µs)
100.00
80.00
60.00
VOD = 20mV
VOD = 125mV
VOD = 200mV
40.00
20.00
0.00
–40
–20
0
20
40
60
80
Temperature (˚C)
AI07878
Figure 11. Power-up trec vs. Temperature
250.00
Power-up trec (ms)
240.00
230.00
L/M
R/S/T
220.00
210.00
200.00
–40
–20
0
20
Temperature (˚C)
40
60
80
AI07881
8/18
STM809/810/811/812
Figure 12. Normalized Reset Threshold vs. Temperature
1.003
1.002
1.001
Normalized Treshold
1.000
0.999
0.998
L/M
R/S/T
0.997
0.996
0.995
0.994
0.993
–40
–20
0
20
40
60
80
Temperature (˚C)
AI07882
Figure 13. Max Transient Duration NOT Causing Reset Pulse vs. Reset Comparator Overdrive
700.00
Maximum Transient Duration (µs)
600.00
500.00
400.00
R/S/T
L/M
300.00
200.00
100.00
0.00
1
10
100
Reset Comparator Overdrive, VRST – VCC (mV)
1000
AI07883
9/18
STM809/810/811/812
MAXIMUM RATING
Stressing the device above the rating listed in the
Absolute Maximum Ratings” table may cause permanent damage to the device. These are stress
ratings only and operation of the device at these or
any other conditions above those indicated in the
Operating sections of this specification is not im-
plied. Exposure to Absolute Maximum Rating conditions for extended periods may affect device
reliability. Refer also to the STMicroelectronics
SURE Program and other relevant quality documents.
Table 3. Absolute Maximum Ratings
Symbol
TSTG
TSLD(1)
Parameter
Storage Temperature (VCC Off)
Lead Solder Temperature for 10 seconds
Value
Unit
–55 to 150
°C
260
°C
–0.3 to VCC +0.3
V
VIO
Input or Output Voltage
VCC
Supply Voltage
–0.3 to 7.0
V
IO
Output Current
20
mA
PD
Power Dissipation
320
mW
Note: 1. Reflow at peak temperature of 255°C to 260°C for < 30 seconds (total thermal budget not to exceed 180°C for between 90 to 150
seconds).
10/18
STM809/810/811/812
DC AND AC PARAMETERS
This section summarizes the operating measurement conditions, and the DC and AC characteristics of the device. The parameters in the DC and
AC characteristics Tables that follow, are derived
from tests performed under the Measurement
Conditions summarized in Table 4., Operating and
AC Measurement Conditions. Designers should
check that the operating conditions in their circuit
match the operating conditions when relying on
the quoted parameters.
Table 4. Operating and AC Measurement Conditions
Parameter
STM809/810/811/812
Unit
VCC Supply Voltage
1.0 to 5.5
V
Ambient Operating Temperature (TA)
–40 to 85
°C
≤5
ns
Input Pulse Voltages
0.2 to 0.8VCC
V
Input and Output Timing Ref. Voltages
0.3 to 0.7VCC
V
Input Rise and Fall Times
Figure 14. AC Testing Input/Output Waveforms
0.8VCC
0.7VCC
0.3VCC
0.2VCC
AI02568
Figure 15. MR Timing Waveform
MR
tMLRL
RST
(1)
tMLMH
trec
AI07837a
Note: 1. RST for STM810/812
11/18
STM809/810/811/812
Table 5. DC and AC Characteristics
Sym
Alternative
Description
VCC
Operating Voltage
ICC
VCC Supply Current
VIH
MR Input High Voltage
VIL
MR Input Low Voltage
VOL
RST Output Low Voltage
(Active High(2) or Low)
VOL
RST Output Low Voltage
RST Output High Voltage
VOH
RST Output High Voltage
Test Condition(1)
Min
TA = –40 to +85°C
TA = 0 to +70°C
Typ
Max
Unit
1.2
5.5
V
1.0
5.5
V
VCC < 3.6V
5.5
10
µA
VCC < 5.5V
7
15
µA
VCC > VRST (max), STM8XXL/M
2.2
V
VCC > VRST (max), STM8XXR/S/T
0.7VCC
V
VCC > VRST (max), STM8XXL/M
0.8
V
VCC > VRST (max), STM8XXR/S/T
0.25VCC
V
STM8XXR/S/T only, IOL = 1.2mA
VCC = VRST (min)
0.3
V
STM8XXL/M only, IOL = 3.2mA
VCC = VRST (min)
0.4
V
0.3
V
IOL = 50µA; VCC > 1.0V
STM8XXR/S/T only, IOH = 500µA
0.8VCC
V
STM8XXL/M only, IOH = 800µA
0.8VCC
V
IOH = 150µA,
1.8V < VCC < VRST (min)
0.8VCC
V
RESET Thresholds
STM8XXL
STM8XXM
VRST
Reset Threshold
STM8XXT
STM8XXS
STM8XXR
VRST Temperature
Coefficient
VCC to RST Delay
25°C
4.56
–40 to 85°C
4.50
25°C
4.31
–40 to 85°C
4.25
25°C
3.04
–40 to 85°C
3.00
25°C
2.89
–40 to 85°C
2.85
25°C
2.59
–40 to 85°C
2.55
4.38
3.08
2.93
2.63
4.70
V
4.75
V
4.45
V
4.50
V
3.11
V
3.15
V
2.96
V
3.00
V
2.66
V
2.70
V
45
ppm/
C
STM8XXL/M
40
µs
STM8XXR/S/T
20
µs
VCC = 3.3V
VCC = VRST
to (VRST –
100mV)
4.63
Push-Button RESET Input
tMLMH
tMR
MR Pulse Width
tMLRL
tMRD
MR to RST Output Delay(3)
0.5
µs
MR Glitch Immunity(4)
100
ns
trec
Note: 1.
2.
3.
4.
12/18
10
µs
MR Pull-up Resistance
10
20
30
kΩ
RST Pulse Width
140
210
280
ms
Valid for Ambient Operating Temperature: TA = –40 to 85°C; VCC = 1.2V to 5.5V (except where noted).
For Active High (RST); VCC = VRST (max)
RST output for STM810/812
“Glitches” of 100ns or less typically will not generate a RESET pulse.
STM809/810/811/812
PACKAGE MECHANICAL
Figure 16. SOT23-3 – 3-lead Small Outline Transistor Package Outline
E
E1
0.15
B
M
CAB
A1
1
e
e1
D
0.20
M
3X
CAB
A2
0.10 C
A
3X b
C
A
C
θ
L1
C
L
SOT23-3
Note: Drawing is not to scale.
Table 6. SOT23-3 – 3-lead Small Outline Transistor Package Mechanical Data
mm
inches
Symbol
Typ
Min
Max
A
0.89
A1
Min
Max
1.12
0.035
0.044
0.01
0.10
0.001
0.004
A2
0.88
1.02
0.035
0.042
b
0.30
0.50
0.012
0.020
C
0.08
0.20
0.003
0.008
D
2.80
3.04
0.110
0.120
E
2.10
2.64
0.083
0.104
E1
1.20
1.40
0.047
0.055
e
0.89
1.03
0.035
0.041
e1
1.78
2.05
0.070
0.081
L
0.54
Typ
0.021
L1
0.40
0.60
0.016
0.024
Θ
0°
8°
0°
8°
N
3
3
13/18
STM809/810/811/812
Figure 17. SOT143-4 – 4-lead Small Outline Transistor Package Outline
E
E1
0.15
B
M
CAB
A1
1
e/2
e1
e
D
0.15
M
CAB
b2
0.20
M
4X
CAB
3X b
A2
C 0.10
A
C
A
C
θ
L1
C
L
SOT143-4
Note: Drawing is not to scale.
Table 7. SOT143-4 – 4-lead Small Outline Transistor Package Mechanical Data
mm
inches
Symbol
Typ
14/18
Min
Max
A
0.89
A1
Typ
Min
Max
1.12
0.035
0.044
0.01
0.10
0.001
0.004
A2
0.88
1.02
0.035
0.042
b
0.37
0.51
0.015
0.020
b2
0.76
0.94
0.030
0.037
C
0.09
0.18
0.004
0.007
D
2.80
3.04
0.110
0.120
E
2.10
2.64
0.083
0.104
E1
1.20
1.40
0.047
0.055
e
1.92
0.076
e1
0.20
0.008
L
0.55
0.022
L1
0.40
0.60
0.016
0.024
Θ
0°
10°
0°
10°
N
4
4
STM809/810/811/812
PART NUMBERING
Table 8. Ordering Information Scheme
Example:
STM8XX
L
WX
6
F
Device Type
STM8XX
Reset Threshold Voltage
L = VRST = 4.50V to 4.75V
M = VRST = 4.25V to 4.50V
T = VRST = 3.00V to 3.15V
S = VRST = 2.85V to 3.00V
R = VRST = 2.55V to 2.70V
Package
WX = SOT23-3 (STM809, STM810)
W1 = SOT143-4 (STM811, STM812)
Temperature Range
6 = –40 to 85°C
Shipping Method
F = Pb-Free Package (ECO
PACK®), Tape & Reel
For a list of available options (e.g., Speed, Package) or for further information on any aspect of this device,
please contact the ST Sales Office nearest to you.
15/18
STM809/810/811/812
Table 9. Marking Description
16/18
Part Number
Reset Threshold
Output
Topside Marking
STM809L
4.63V
Push-Pull RST
8AAx
STM809M
4.38V
Push-Pull RST
8ABx
STM809T
3.08V
Push-Pull RST
8ACx
STM809S
2.93V
Push-Pull RST
8ADx
STM809R
2.63V
Push-Pull RST
8AEx
STM810L
4.63V
Push-Pull RST
8AFx
STM810M
4.38V
Push-Pull RST
8AGx
STM810T
3.08V
Push-Pull RST
8AHx
STM810S
2.93V
Push-Pull RST
8AJx
STM810R
2.63V
Push-Pull RST
8AKx
STM811L
4.63V
Push-Pull RST
8ALx
STM811M
4.38V
Push-Pull RST
8AMx
STM811T
3.08V
Push-Pull RST
8ANx
STM811S
2.93V
Push-Pull RST
8APx
STM811R
2.63V
Push-Pull RST
8AQx
STM812L
4.63V
Push-Pull RST
8ARx
STM812M
4.38V
Push-Pull RST
8ASx
STM812T
3.08V
Push-Pull RST
8ATx
STM812S
2.93V
Push-Pull RST
8AUx
STM812R
2.63V
Push-Pull RST
8AVx
STM809/810/811/812
REVISION HISTORY
Table 10. Document Revision History
Date
Version
Revision Details
02-Sep-03
1.0
First Issue
03-Oct-03
1.1
Update Operating Characteristics (Figure 8, 9, 10, 11, 12, 13)
16-Oct-03
1.2
Update characteristics (Table 5); modify illustration (Figure 13)
17-Nov-03
1.3
Modified with JEDEC timing symbols (Figure 15; Table 5)
04-Dec-03
2.0
Reformatted; promoted; updated (Figure 15; Table 5, 6)
09-Dec-03
2.1
Correct timing label, combine characteristics (Figure 11; Table 5)
10-Feb-04
3.0
Clarify package; update DC Characteristics (Table 5, 8)
19-Nov-04
4.0
Update dimensions (Table 6)
17/18
STM809/810/811/812
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