STMICROELECTRONICS STM1001S

STM1001
Reset Circuit
FEATURES SUMMARY
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PRECISION MONITORING OF 3V, 3.3V, and
5V SUPPLY VOLTAGES
OPEN DRAIN RST OUTPUT
140ms RESET PULSE WIDTH (MIN)
LOW SUPPLY CURRENT - 6µA (TYP)
GUARANTEED RST ASSERTION DOWN TO
VCC = 1.0V
OPERATING TEMPERATURE:
–40°C to 85°C (Industrial Grade)
LEAD-FREE, SMALL SOT23 PACKAGE
Figure 1. Logic Diagram
SOT23-3 (WX)
Table 1. Signal Names
VCC
STM1001
Figure 2. Package
RST
VSS
Ground
RST
Active-Low RESET Output (Open
Drain)
VCC
Supply Voltage
Figure 3. SOT23-3 Connections
RST
VCC
VSS
November 2004
AI09116
1
2
3
VSS
AI09117
1/13
STM1001
TABLE OF CONTENTS
FEATURES SUMMARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Figure 1.
Figure 2.
Table 1.
Figure 3.
Logic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Package. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Signal Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
SOT23-3 Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
SUMMARY DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Figure 4. Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Figure 5. Hardware Hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Reset Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Negative-Going VCC Transients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Valid /RST Output Down to VCC = 0V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
TYPICAL OPERATING CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 6. Supply Current vs. Temperature, L/M/R/S/T (no load) . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 7. Power-down Reset Delay vs. Temperature - VOD = VTH – VCC (L/M). . . . . . . . . . . . . . . . 5
Figure 8. Power-down Reset Delay vs. Temperature - VOD = VTH – VCC (R/S/T) . . . . . . . . . . . . . . 6
Figure 9. Power-up trec vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 10.Normalized Reset Threshold vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 11.Max Transient Duration NOT Causing Reset Pulse vs. Reset Comparator Overdrive . . . 7
MAXIMUM RATING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 2. Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
DC and AC PARAMETERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 3. Operating and AC Measurement Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 12.AC Testing Input/Output Waveforms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 4. DC and AC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
PACKAGE MECHANICAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 13.SOT23-3 – 3-lead Small Outline Transistor Package Outline . . . . . . . . . . . . . . . . . . . . . 10
Table 5. SOT23-3 – 3-lead Small Outline Transistor Package Mechanical Data . . . . . . . . . . . . . 10
PART NUMBERING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Table 6. Ordering Information Scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Table 7. Marking Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
REVISION HISTORY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Table 8. Document Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
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STM1001
SUMMARY DESCRIPTION
The STM1001 MICROPROCESSOR RESET Circuit is a low-power supervisory device used to
monitor power supplies. It performs 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).
Figure 4. Block Diagram
VCC
VRST
COMPARE
trec
Generator
RST(1)
AI09118
Note: 1. Open Drain
Figure 5. Hardware Hookup
VCC
VCC
(1)
STM1001
MCU
(1)
RST
VSS
VCC
RESET
Input
VSS
AI09119
Note: 1. RST output requires pull-up resistor.
3/13
STM1001
OPERATION
Reset Output
The STM1001 MICROPROCESSOR RESET
CIRCUIT asserts a reset signal to the MCU whenever VCC goes below the reset threshold (VRST).
RST 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) is an
open drain output.
Negative-Going VCC Transients
The STM1001 is relatively immune to negative-going VCC transients (glitches). Figure 11., page 7
shows typical transient duration versus reset comparator overdrive (for which the STM1001 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
4/13
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 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.
STM1001
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 6. 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 7. 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
5/13
STM1001
Figure 8. 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 9. 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
6/13
STM1001
Figure 10. 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 11. 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
7/13
STM1001
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 2. Absolute Maximum Ratings
Symbol
TSTG
TSLD(1)
Parameter
Value
Unit
–55 to 150
°C
260
°C
–0.3 to VCC +0.3
V
Storage Temperature (VCC Off)
Lead Solder Temperature for 10 seconds
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).
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 3, 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 3. Operating and AC Measurement Conditions
Parameter
STM1001
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 12. AC Testing Input/Output Waveforms
0.8VCC
0.2VCC
0.7VCC
0.3VCC
AI02568
8/13
STM1001
Table 4. DC and AC Characteristics
Sym
Alternative
VCC
Description
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
Operating Voltage
VCC Supply Current
ICC
Open Drain Reset Output
Leakage Current
ILO
VOL
VCC < 3.6V
5.5
10
µA
VCC < 5.5V
7
15
µA
+1
µA
STM1001R/S/T only, IOL = 1.2mA
VCC = VRST (min)
0.3
V
STM1001L/M only, IOL = 3.2mA
VCC = VRST (min)
0.4
V
IOL = 50µA; VCC > 1.0V
0.3
V
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
VCC > VRST,
Reset not asserted
–1
RST Output Low Voltage
VOL
RST Output Low Voltage
RESET Thresholds
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
4.63
STM1001L
4.38
STM1001M
VRST
Reset Threshold
3.08
STM1001T
2.93
STM1001S
2.63
STM1001R
VRST Temperature
Coefficient
VCC to RST Delay
trec
RST Pulse Width
45
ppm/
C
STM1001L/M
40
µs
STM1001R/S/T
20
µs
VCC = 3.3V
VCC = VRST
to (VRST –
100mV)
140
210
280
ms
Note: 1. Valid for Ambient Operating Temperature: TA = –40 to 85°C; VCC = 1.2V to 5.5V (except where noted).
2. “Glitches” of 100ns or less typically will not generate a RESET pulse.
9/13
STM1001
PACKAGE MECHANICAL
Figure 13. 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 5. 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
10/13
0.54
Typ
0.021
L1
0.40
0.60
0.016
0.024
Θ
0°
8°
0°
8°
N
3
3
STM1001
PART NUMBERING
Table 6. Ordering Information Scheme
Example:
STM1001
L
WX
6
F
Device Type
STM1001
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
Temperature Range
6 = –40 to 85°C
Shipping Method
F = Pb-Free Package (ECO
PACK®), Tape & Reel
For other options, or for more information on any aspect of this device, please contact the ST Sales Office
nearest you.
Table 7. Marking Description
Part Number
Reset Threshold
Output
Topside Marking(1)
STM1001L
4.63V
Open Drain RST
8BAx
STM1001M
4.38V
Open Drain RST
8BBx
STM1001T
3.08V
Open Drain RST
8BCx
STM1001S
2.93V
Open Drain RST
8BDx
STM1001R
2.63V
Open Drain RST
8BEx
Note: 1. Lowercase “x” indicates date code.
11/13
STM1001
REVISION HISTORY
Table 8. Document Revision History
Date
Version
09-Dec-03
1.0
First Edition
19-Feb-04
2.0
Part number changed from STM6301
22-Mar-04
2.1
Update DC Characteristics (Table 4)
09-Apr-04
3.0
Device promoted; reformatted; marking updated (Table 7)
19-Nov-04
4.0
Update dimensions (Table 5)
12/13
Revision Details
STM1001
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences
of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted
by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject
to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not
authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
The ST logo is a registered trademark of STMicroelectronics.
All other names are the property of their respective owners
© 2004 STMicroelectronics - All rights reserved
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