ST STM1061 User manual

July 2006 Rev 4 1/23
1
STM1061
Low Power Voltage Detector
Features
■Factory-trimmed Voltage Thresholds in 0.1V
Increments from 1.6 to 5.5V
■±2% Voltage Threshold Accuracy
■Operating Voltage 0.7 to 6.0V
■Open Drain Output
■Low Supply Current of 0.9µA (typ)
■ GuaranteedOUT Assertion Down to V
CC
= 0.7V
■Power Supply Transient Immunity
■Available in SOT23-3 and SOT323-3 (SC70-3)
packages
■Operating Temperature –40 to 85°C.
Figure 1. Packages
1. Contact local sales office for availability.
SOT323-3, SC70-3 (W) (1)
SOT23-3 (WX)
www.st.com

Contents STM1061
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Contents
1 Summary Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1 OUT (Open Drain) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2 VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.3 VSS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.1 Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.2 Negative-Going VCC Transients and Undershoot . . . . . . . . . . . . . . . . . . . . 8
4 Typical Operating Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5 Maximum Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
6 DC and AC Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
7 Package Mechanical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
8 Part Numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
9 Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

STM1061 List of tables
3/23
List of tables
Table 1. Signal Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Table 2. Pin Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 3. Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Table 4. Operating and AC Measurement Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Table 5. DC and AC Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Table 6. SOT23-3 – 3-lead Small Outline Transistor Package Mechanical Data. . . . . . . . . . . . . . . 18
Table 7. SOT323-3 (SC70-3) – 3-lead Small Outline Transistor Package Mechanical Data . . . . . . 19
Table 8. Ordering Information Scheme. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Table 9. Factory-Trimmed Thresholds with Marking Description . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Table 10. Document Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

List of figures STM1061
4/23
List of figures
Figure 1. Packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Figure 2. Logic Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 3. SOT23-3 Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 4. SOT323-3 (SC70-3) Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 5. N-Channel Open Drain Output Block Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 6. STM1061N Active-Low, Open Drain Hardware Hookup. . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 7. Supply Current vs. Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 8. Supply Current vs. Ambient Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 9. Output Detect Delay Time vs. Ambient Temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 10. Output Release Delay Time vs. Ambient Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 11. Maximum Transient Duration vs. Reset Threshold Overdrive . . . . . . . . . . . . . . . . . . . . . . 11
Figure 12. Detect, Release Voltage vs. Ambient Temperature for VTH– = 3.4V . . . . . . . . . . . . . . . . . 11
Figure 13. N-channel Driver Output Current vs. VDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Figure 14. N-channel Driver Output Current vs. Input Voltage for VDS = 0.5V . . . . . . . . . . . . . . . . . . 12
Figure 15. AC Testing Input/Output Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 16. Voltage Timing Waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 17. SOT23-3 – 3-lead Small Outline Transistor Package Outline. . . . . . . . . . . . . . . . . . . . . . . 17
Figure 18. SOT323-3 (SC70-3) – 3-lead Small Outline Transistor Package Outline. . . . . . . . . . . . . . 19

STM1061 Summary Description
5/23
1 Summary Description
The STM1061 low power voltage detector provides monitoring of battery, power-supply, and
regulated system voltages. A precision voltage reference and comparator monitors the VCC
input and compares it with a specified voltage threshold condition. When VCC falls below a
specified trip point threshold, the output (OUT) is forced low and remains asserted as long
as the VCC input remains below VTH– + hysteresis (VHYST). The STM1061 device is
guaranteed to output the correct logic state for VCC down to 0.7V. They are also designed to
ignore fast transients on VCC.
This small, low power device is ideal for portable applications and is available in space-
saving SOT23-3 and SOT323-3 (SC70-3) packages.
Figure 2. Logic Diagram
Table 1. Signal Names
Figure 3. SOT23-3 Connections
OUT Open Drain Active-Low Output
VCC Supply Voltage
VSS Ground
AI10477
VCC
STM1061
VSS
OUT
AI10478
23
1
OUT VCC
VSS

Summary Description STM1061
6/23
Figure 4. SOT323-3 (SC70-3) Connections
Figure 5. N-Channel Open Drain Output Block Diagram
Figure 6. STM1061N Active-Low, Open Drain Hardware Hookup
AI10479
23
1
OUT VCC
VSS
AI10482
VCC
R1
R2
R3
VSS
+
–
VREF
OUT
AI10484a
VCC
VIN
+
VSS
VCC
MCU
STM1061N
(Open Drain)
DC/DC
Converter
OUT
3.6V
VOUT
VSS
VSS
Suspend
Regulated 3V
R
VOUT

STM1061 Pin Descriptions
7/23
2 Pin Descriptions
See Figure 2 on page 5 and Table 1 on page 5 for a brief overview of the signals connected
to this device.
2.1 OUT (Open Drain)
This is the Open Drain Output. It goes low when VCC drops below VTH–, and remains low as
long as VCC is below VTH– + VHYST.
2.2 VCC
This is the Supply voltage and input for the Voltage Detector.
2.3 VSS
Ground, VSS, is the reference for the power supply. It must be connected to the system
ground.
Table 2. Pin Functions
Pin
Name Function
SOT23-3 SOT323-3
(SC70-3)
1 2 OUT Active-Low Open Drain Output
33V
CC Supply Voltage
21V
SS Ground

Operation STM1061
8/23
3 Operation
3.1 Output
The STM1061 Voltage Detector monitors system voltages from 1.6 to 5V in 100mV
increments. The detector is designed to ignore fast transients on VCC and has a voltage
hysteresis (VHYST). The STM1061 asserts an output signal (OUT) whenever VCC goes
below the Voltage Detect Threshold (VTH–). The output signal (OUT) stays asserted until
VCC goes above the Voltage Detect Release (VTH+). Output voltage (VOUT) is guaranteed
valid down to VCC =0.7V at 25°C.
The STM1061has an open drain active-low output which will sink current when output is
asserted. Connect a pull-up resistor from OUT to any supply voltage up to 6V (see Figure 6
on page 6). Select a resistor value large enough to register a logic low, and small enough to
register a logic high while all of the input current and leakage paths connected to the reset
output line are being supplied. A 10k pull-up is sufficient in most applications.
The advantages of open drain output is the ability to connect more open drain outputs in
parallel (wired OR connections) as well as connect the output to a power supply voltage
different from VCC.
3.2 Negative-Going VCC Transients and Undershoot
The STM1061 device is relatively immune to negative-going VCC transients (glitches). The
graph (see Figure 11 on page 11) 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.
A 0.1µF bypass capacitor mounted as close as possible to the VCC pin provides additional
transient immunity.

STM1061 Typical Operating Characteristics
9/23
4 Typical Operating Characteristics
Figure 7. Supply Current vs. Input Voltage
Figure 8. Supply Current vs. Ambient Temperature
VCC (V)
ICC (nA)
AI11119b
0
200
400
600
800
1000
1200
1400
0123456
Temp = –40°C
Temp = 25°C
Temp = 85°C
AmbientTemperature (°C)
Supply Current: ICC (nA)
AI11120b
0
250
500
750
1000
1250
-40 -20 0 20 40 60 80
VCC = 2V
VCC = 3V
VCC = 5V

Typical Operating Characteristics STM1061
10/23
Figure 9. Output Detect Delay Time vs. Ambient Temperature
Figure 10. Output Release Delay Time vs. Ambient Temperature
AmbientTemperature:TA(°C)
VCC-to-OUT Detect Delay: tPD (µs)
AI11121b
0.00
5.00
10.00
15.00
20.00
25.00
30.00
35.00
–40 –20 0 20 40 60 80
VTH– = 3.4V
VTH– = 1.6V
AmbientTemperature:TA(°C)
VCC-to-OUT Release Delay: tPR (µs)
AI11122b
0.00
5.00
10.00
15.00
20.00
25.00
30.00
35.00
40.00
45.00
50.00
–40 –20 0 20 40 60 80
VTH+ = 1.68V
VTH+ = 3.57V

STM1061 Typical Operating Characteristics
11/23
Figure 11. Maximum Transient Duration vs. Reset Threshold Overdrive
1. Reset occurs above the curve.
Figure 12. Detect, Release Voltage vs. Ambient Temperature for VTH– = 3.4V
Threshold Overdrive (mV)
Transient Duration (µs)
AI11123b
0
20
40
60
80
100
120
140
160
1 10 100 1000 10000
VTH– = 3.4V
VTH– = 1.6V
AmbientTemperature (°C)
Detect, ReleaseVoltage:VTH–, VTH+ (V)
AI11124b
3.3
3.4
3.5
3.6
–40 –20 0 20 40 60 80
Detect Voltage, VTH–
Release Voltage, VTH+

Typical Operating Characteristics STM1061
12/23
Figure 13. N-channel Driver Output Current vs. VDS
Figure 14. N-channel Driver Output Current vs. Input Voltage for VDS = 0.5V
OutputVoltage:VDS (V)
Output Current: ID(A)
AI11125b
0
0.01
0.02
0.03
0.04
0.05
0.06
0 0.25 0.5 0.75 1 1.25 1.5
VCC = 3.3V
VCC = 3.0V
VCC = 2.7V
VCC = 2.1V
VCC = 1.5V
VCC = 1.0V
InputVoltage:VCC (V)
Output Current: IOUT (mA)
AI11126b
0
5
10
15
20
25
30
0 0.5 1 1.5 2 2.5 3
Temp. (25°C)
Temp. (85°C)
Temp. (–40°C)

STM1061 Maximum Rating
13/23
5 Maximum Rating
Stressing the device above the rating listed in the Table 3: Absolute Maximum Ratings 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 Parameter Value Unit
TSTG Storage Temperature (VCC Off, VBAT Off) –55 to 150 °C
TSLD(1)
1. Reflow at peak temperature of 260°C (total thermal budget not to exceed 245°C for greater than 30
seconds).
Lead Solder Temperature for 10 seconds 260 °C
VIO Input or Output Voltage –0.3 to VCC +0.3 V
VCC Supply Voltage –0.3 to 7.0 V
IOOutput Current 20 mA
PDPower Dissipation 320 mW

DC and AC Parameters STM1061
14/23
6 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.
Figure 15. AC Testing Input/Output Waveforms
Table 4. Operating and AC Measurement Conditions
Sym Parameter STM1061 Unit
VCC Supply Voltage 0.7 to 6.0 V
TAAmbient Operating Temperature –40 to 85 °C
Input Rise and Fall Times ≤05ns
Input Pulse Voltages 0.2 to 0.8VCC V
Input and Output Timing Ref. Voltages 0.3 to 0.7VCC V
AI02568
0.8VCC
0.2VCC
0.7VCC
0.3VCC

STM1061 DC and AC Parameters
15/23
Figure 16. Voltage Timing Waveform
AI10483
VCC
VCC (min)
VSS
VTH+
VTH–
tPR
Release Delay
tPD
Detect Delay
Release Voltage (VTH+ = VTH– + VHYST)
Detect Voltage
VSS
VOUT

DC and AC Parameters STM1061
16/23
Table 5. DC and AC Characteristics
Sym. Description Test Condition (1)
1. Valid for Ambient Operating Temperature: TA= 25°C.
Min Typ Max Unit
VCC Operating Voltage 0.7 6.0 V
ICC VCC Supply Current VCC = 3.0V, No Load 0.9 3.0 µA
VCC = 5.5V, No Load 1.1 3.6 µA
IOUT
Output Current, N-channel
(VDS = 0.5V),
Reset asserted
VCC = 1.0V 1.0 1.7 mA
VCC = 2.0V 3.0 14 mA
VCC = 3.0V 5.0 22 mA
VCC = 4.0V 6.0 26 mA
VCC = 5.0V 7.0 30 mA
Voltage Thresholds
VTH–
Detect Voltage (2)
(see Table 9 on page 21 for
detailed listing)
2. Other VTH- threshold are offered. Minimum order quantities may apply. Contact local sales office for availability.
VTH– – 2% VTH– VTH– + 2% V
VTH+ Release Voltage VTH– +
VHYST V
VHYST Threshold Hysteresis 0.02VTH– 0.05VTH– 0.08VTH– V
tPD VCC to OUT Detect Delay
VCC fallingfrom(VTH–
+ 100mV) to (VTH– –
100mV)
at 10mV/µs
25 µs
tPR VCC to OUT Release Delay
VCC rising from (VTH+
– 100mV) to (VTH+ +
100mV)
at 10mV/µs
30 200 µs
Threshold Temperature
Coefficient ±100 ppm/oC

STM1061 Package Mechanical
17/23
7 Package Mechanical
In order to meet environmental requirements, ST offers these devices in ECOPACK®
packages. These packages have a Lead-free second level interconnect. The category of
second Level Interconnect is marked on the package and on the inner box label, in
compliance with JEDEC Standard JESD97.
The maximum ratings related to soldering conditions are also marked on the inner box label.
ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com.
Figure 17. SOT23-3 – 3-lead Small Outline Transistor Package Outline
1. Drawing is not to scale.
SOT23-3
0.10 C
A
A2
A1
3X
C
C
L1
θ
LC
e1 D
e
3X b
E
M
0.15 CAB
BE1
A
M
0.20 C A B
1

Package Mechanical STM1061
18/23
Table 6. SOT23-3 – 3-lead Small Outline Transistor Package Mechanical Data
Symbol mm inches
Typ Min Max Typ Min Max
A 0.89 1.12 0.035 0.044
A1 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 0.021
L1 0.40 0.60 0.016 0.024
Q0°8°0°8°
N3 3

STM1061 Package Mechanical
19/23
Figure 18. SOT323-3 (SC70-3) – 3-lead Small Outline Transistor Package Outline
1. Drawing is not to scale.
Table 7. SOT323-3 (SC70-3) – 3-lead Small Outline Transistor Package Mechanical
Data
Symbol mm inches
Typ Min Max Typ Min Max
A 0.80 1.10 0.031 0.043
A1 0.00 0.10 0.000 0.004
A2 0.80 1.00 0.031 0.039
b 0.25 0.40 0.010 0.016
C 0.10 0.18 0.004 0.007
D 1.80 2.20 0.071 0.087
E 1.80 2.40 0.071 0.094
E1 1.15 1.35 0.045 0.053
e0.65 0.026
e1 1.30 0.051
L 0.35 0.45 0.014 0.018
L1 0.10 0.30 0.004 0.012
Q 0° 30° 0° 30°
Θ1 8° 12° 8° 12°
N3 3
SOT323-3
0.10 C
A
A2
A1
3X
C
e1 D
e
3X b
E
M
0.30 CAB
BE1
A
M
0.10 C A B
1
C
L1
θ1
θ
LC

Part Numbering STM1061
20/23
8 Part Numbering
Table 8. Ordering Information Scheme
Example: STM1061 N xx WX 6 F
Device Type
STM1061
Output Type
N = Open Drain (Active-Low)
Threshold Voltage (1)
1. Other thresholds voltage options are offered. Minimum order quantities may apply. Contact local
sales office for availability.
For other options, or for more information on any aspect of this device, please contact
the ST Sales Office nearest you.
xx = See Table 9 on page 21
Package
WX = SOT23-3
W = SOT323-3 (SC70-3) (1)
Temperature Range
6 = –40 to 85°C
Shipping Method
F = ECOPACK Package, Tape & Reel