STMICROELECTRONICS STM809

STM809, STM810
STM811, STM812
Reset circuit
Features
■
Precision monitoring of 3 V, 3.3 V, and 5 V
supply voltages
■
Two output configurations
– Push-pull RST output (STM809/811)
– Push-pull RST output (STM810/812)
■
140 ms reset pulse width (min)
■
Low supply current - 6 µA (typ)
■
Guaranteed RST/RST assertion down to
VCC = 1.0 V
■
Operating temperature:
–40 °C to 85 °C (industrial grade)
■
Lead-free, small SOT23 and SOT143 package
Table 1.
SOT143-4 (W1)
Device summary
Active-low reset
STM809
STM811
STM812
Active-high reset
Manual reset input
✔
Package
SOT23-3
✔
STM810
January 2010
SOT23-3 (WX)
✔
✔
Doc ID 9873 Rev 5
SOT23-3
✔
SOT143-4
✔
SOT143-4
1/21
www.st.com
1
Contents
STM809/810/811/812
Contents
1
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1
Reset output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2
Push-button reset input (STM811/812) . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.3
Negative-going VCC transients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.4
Valid RST output down to VCC = 0 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3
Typical operating characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5
DC and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
7
Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
8
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
2/21
Doc ID 9873 Rev 5
STM809/810/811/812
List of tables
List of tables
Table 1.
Table 2.
Table 3.
Table 4.
Table 5.
Table 6.
Table 7.
Table 8.
Table 9.
Table 10.
Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Operating and AC measurement conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
DC and AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
SOT23-3 – 3-lead small outline transistor package mechanical data. . . . . . . . . . . . . . . . . 16
SOT143-4 – 4-lead small outline transistor package mechanical data. . . . . . . . . . . . . . . . 17
Ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Marking description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Doc ID 9873 Rev 5
3/21
List of figures
STM809/810/811/812
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figure 10.
Figure 11.
Figure 12.
Figure 13.
Figure 14.
Figure 15.
Figure 16.
4/21
Logic diagram (STM809/810) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Logic diagram (STM811/812) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
SOT23-3 connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
SOT143-4 connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Hardware hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Supply current vs. temperature, L/M/R/S/T (no load) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Power-down reset delay vs. temperature - VOD = VTH – VCC (L/M) . . . . . . . . . . . . . . . . . . . 9
Power-down reset delay vs. temperature - VOD = VTH – VCC (R/S/T) . . . . . . . . . . . . . . . . 10
Power-up trec vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Normalized reset threshold vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Max transient duration NOT causing reset pulse vs. reset comparator overdrive . . . . . . . 11
AC testing input/output waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
MR timing waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
SOT23-3 – 3-lead small outline transistor package outline . . . . . . . . . . . . . . . . . . . . . . . . 16
SOT143-4 – 4-lead small outline transistor package outline . . . . . . . . . . . . . . . . . . . . . . . 17
Doc ID 9873 Rev 5
STM809/810/811/812
1
Description
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 1.
Logic diagram (STM809/810)
VCC
STM809/810
(1)
RST (RST)
VSS
AI07832
1. For STM810
Figure 2.
Logic diagram (STM811/812)
VCC
MR
STM811/812
VSS
RST (RST)(1)
AI07831
1. For STM812
Table 2.
Signal names
VSS
Ground
RST
Active-low reset output
RST(1)
Active-high reset output
VCC
Supply voltage
MR(2)
Manual reset input
1. STM810/812 only
2. STM811/812 only
Doc ID 9873 Rev 5
5/21
Description
STM809/810/811/812
Figure 3.
SOT23-3 connections
VSS
1
2
RST (RST)
3
VCC
(For STM810)
Figure 4.
AI07833
SOT143-4 connections
VSS
1
2
RST (RST)
4
3
VCC
MR
(For STM812)
AI07834
Figure 5.
Block diagram
VCC
VRST
COMPARE
trec
Generator
MR(1)
RST(2)
DEBOUNCE
AI07835
1. STM811/812 only
2. RST for STM810/812
Figure 6.
Hardware hookup
VCC
VCC
VCC
STM809/810/
811/812
MCU
MR(2)
(1)
RST
Push-button
RESET
VSS
RESET
Input
VSS
AI07836
1. STM809/811 only (RST for STM810/812)
2. STM811/812 only
6/21
Doc ID 9873 Rev 5
STM809/810/811/812
2
Operation
2.1
Reset output
Operation
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 14 on page 13). RST (active high for STM810/812) is
guaranteed valid down to VCC = 1 V (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.
2.2
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 20 kΩ 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 0.1 µF capacitor from MR to GND to provide additional noise
immunity.
2.3
Negative-going VCC transients
The STM809/810/811/812 are relatively immune to negative-going VCC transients (glitches).
Figure 12 on page 11 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 100 mV below the reset threshold and lasts 20 µs or less will not cause a reset pulse.
A 0.1 µF bypass capacitor mounted as close as possible to the VCC pin provides additional
transient immunity.
Doc ID 9873 Rev 5
7/21
Operation
2.4
STM809/810/811/812
Valid RST output down to VCC = 0 V
When VCC falls below 1 V, 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 1 V. However, in applications where RST output must be valid down to 0 V, 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
100 kΩ resistor is recommended.
Note:
8/21
The same situation applies for the active-high RST of the STM810/812. A 100 kΩ pull-up
resistor to VCC should be used if RST must remain valid for VCC < 1.0 V.
Doc ID 9873 Rev 5
STM809/810/811/812
Typical operating characteristics
3
Typical operating characteristics
Note:
Typical values are at TA = 25 °C, VCC = 5 V for L/M versions, VCC = 3.3 V for T/S versions,
and VCC = 3.0 V for R versions.
Figure 7.
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
Power-down reset delay vs. temperature - VOD = VTH – VCC (L/M)
140.00
120.00
Power-Down Reset Delay (µs)
Figure 8.
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
Doc ID 9873 Rev 5
9/21
Typical operating characteristics
Figure 9.
STM809/810/811/812
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 10. 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
10/21
Doc ID 9873 Rev 5
STM809/810/811/812
Figure 11.
Typical operating characteristics
Normalized reset threshold vs. temperature
1.003
1.002
1.001
Normalized Threshold
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 12. 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)
Doc ID 9873 Rev 5
1000
AI07883
11/21
Maximum ratings
4
STM809/810/811/812
Maximum ratings
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 implied. 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
Supply voltage
–0.3 to 7.0
V
IO
Output current
20
mA
PD
Power dissipation
320
mW
VIO
Input or output voltage
VCC
1. Reflow at peak temperature of 260 °C. The time above 255 °C must not exceed 30 seconds.
12/21
Doc ID 9873 Rev 5
STM809/810/811/812
5
DC and AC parameters
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.. 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 0.8 VCC
V
Input and output timing ref. voltages
0.3 to 0.7 VCC
V
Input rise and fall times
Figure 13. AC testing input/output waveforms
0.8VCC
0.7VCC
0.3VCC
0.2VCC
AI02568
Figure 14. MR timing waveform
MR
tMLRL
RST
(1)
tMLMH
trec
AI07837a
1. RST for STM810/812
Doc ID 9873 Rev 5
13/21
DC and AC parameters
Table 5.
Sym
DC and AC characteristics
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
STM809/810/811/812
RST output low voltage
RST output high voltage
VOH
RST output high voltage
Test condition(1)
Min
1.2
TA = –40 to +85 °C
TA = 0 to +70 °C
1.0
VCC < 3.6 V
VCC < 5.5 V
2.2
VCC > VRST (max), STM8XXL/M
VCC > VRST (max), STM8XXR/S/T 0.7 VCC
VCC > VRST (max), STM8XXL/M
VCC > VRST (max), STM8XXR/S/T
STM8XXR/S/T only,
IOL = 1.2 mA
VCC = VRST (min)
STM8XXL/M only,
IOL = 3.2 mA
VCC = VRST (min)
IOL = 50 µA; VCC > 1.0 V
STM8XXR/S/T only,
IOH = 500 µA
STM8XXL/M only,
IOH = 800 µA
IOH = 150 µA,
1.8 V < VCC < VRST (min)
Typ
Max
Unit
5.5
7
5.5
5.5
10
15
0.8
0.25 VCC
V
V
µA
µA
V
V
V
V
0.3
V
0.4
V
0.3
V
0.8 VCC
V
0.8 VCC
V
0.8 VCC
V
Reset thresholds
STM8XXL
STM8XXM
VRST
Reset threshold
STM8XXT
STM8XXS
STM8XXR
14/21
25 °C
–40 to 85 °C
25 °C
–40 to 85 °C
25 °C
–40 to 85 °C
25 °C
–40 to 85 °C
25 °C
–40 to 85 °C
4.56
4.50
4.31
4.25
3.04
3.00
2.89
2.85
2.59
2.55
4.63
4.38
3.08
2.93
2.63
VRST temperature
coefficient
VCC = 3.3 V
45
VCC to RST delay
STM8XXL/M
VCC = VRST to
(VRST – 100 mV) STM8XXR/S/T
40
20
Doc ID 9873 Rev 5
4.70
4.75
4.45
4.50
3.11
3.15
2.96
3.00
2.66
2.70
V
V
V
V
V
V
V
V
V
V
ppm/
°C
µs
µs
STM809/810/811/812
Sym
Alternative
Description
DC and AC parameters
Test condition(1)
Min
Typ
Max
Unit
Push-button reset input
tMLMH
tMR
tMLRL
tMRD
trec
MR pulse width
MR to RST output
delay(3)
MR glitch immunity(4)
MR pull-up resistance
RST pulse width
10
µs
0.5
10
140
1.
Valid for ambient operating temperature: TA = –40 to 85 °C; VCC = 1.2 V to 5.5 V (except where noted).
2.
For active high (RST); VCC = VRST (max)
3.
RST output for STM810/812
4.
“Glitches” of 100 ns or less typically will not generate a reset pulse.
Doc ID 9873 Rev 5
100
20
210
µs
30
280
ns
kΩ
ms
15/21
Package mechanical data
6
STM809/810/811/812
Package mechanical data
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK® is an ST trademark.
Figure 15. 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
0.10 C
A
3X b
A2
C
A
C
L1
C
L
Note:
Drawing is not to scale.
Table 6.
Symbol
SOT23-3 – 3-lead small outline transistor package mechanical data
mm
Typ
inches
Min
Max
Min
Max
A
0.89
1.12
0.035
0.044
A1
A2
0.01
0.10
0.001
0.004
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
1.78
2.05
0.070
0.081
e1
L
16/21
SOT23-3
0.54
Typ
0.021
L1
0.40
0.60
0.016
0.024
Θ
0°
8°
0°
8°
N
3
Doc ID 9873 Rev 5
3
STM809/810/811/812
Package mechanical data
Figure 16. 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
C 0.10
A
3X b
A2
C
A
C
L1 C
L
Note:
SOT143-4
Drawing is not to scale.
Table 7.
Symbol
SOT143-4 – 4-lead small outline transistor package mechanical data
mm
Typ
inches
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
Doc ID 9873 Rev 5
4
17/21
Part numbering
7
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 = 4.50 V to 4.75 V
M = VRST = 4.25 V to 4.50 V
T = VRST = 3.00 V to 3.15 V
S = VRST = 2.85 V to 3.00 V
R = VRST = 2.55 V to 2.70 V
Package
WX = SOT23-3 (STM809, STM810)
W1 = SOT143-4 (STM811, STM812)
Temperature range
6 = –40 to 85 °C
Shipping method
F = ECOPACK® package, 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.
18/21
Doc ID 9873 Rev 5
STM809/810/811/812
Table 9.
Part numbering
Marking description
Part number
Reset threshold
Output
Topside marking(1)
STM809L
4.63 V
Push-pull RST
8AAx
STM809M
4.38 V
Push-pull RST
8ABx
STM809T
3.08 V
Push-pull RST
8ACx
STM809S
2.93 V
Push-pull RST
8ADx
STM809R
2.63 V
Push-pull RST
8AEx
STM810L
4.63 V
Push-pull RST
8AFx
STM810M
4.38 V
Push-pull RST
8AGx
STM810T
3.08 V
Push-pull RST
8AHx
STM810S
2.93 V
Push-pull RST
8AJx
STM810R
2.63 V
Push-pull RST
8AKx
STM811L
4.63 V
Push-pull RST
8ALx
STM811M
4.38 V
Push-pull RST
8AMx
STM811T
3.08 V
Push-pull RST
8ANx
STM811S
2.93 V
Push-pull RST
8APx
STM811R
2.63 V
Push-pull RST
8AQx
STM812L
4.63 V
Push-pull RST
8ARx
STM812M
4.38 V
Push-pull RST
8ASx
STM812T
3.08 V
Push-pull RST
8ATx
STM812S
2.93 V
Push-pull RST
8AUx
STM812R
2.63 V
Push-pull RST
8AVx
1. x = letter assigned to indicate assembly work week (i.e., A = WW01 and WW02, B = WW03 and WW04,
C = WW05 and WW06..., Z = WW51, WW52, and WW53).
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Revision history
8
STM809/810/811/812
Revision history
Table 10.
20/21
Document revision history
Date
Revision
Changes
02-Sep-2003
1
03-Oct-2003
1.1
Update operating characteristics (Figure 7, Figure 8, Figure 9,
Figure 10, Figure 11, Figure 12)
16-Oct-2003
1.2
Update characteristics (Table 5); modify illustration (Figure 12)
17-Nov-2003
1.3
Modified with JEDEC timing symbols (Figure 14;Table 5)
04-Dec-2003
2
Reformatted; promoted; updated (Figure 14; Table 5, 6)
09-Dec-2003
2.1
10-Feb-2004
3
Clarify package; update DC characteristics (Table 5, Table 8)
19-Nov-2004
4
Update dimensions (Table 6).
05-Jan-2010
5
Updated footnote in Table 3, added text to Section 6: Package
mechanical data, added footnote to Table 9.
First issue
Correct timing label, combine characteristics (Figure 10; Table 5)
Doc ID 9873 Rev 5
STM809/810/811/812
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