Jul y 2006 Rev 4 1/ 2 3
1
STM1061
Low Power Voltage Detector
Features
■Factory-t rimmed Volt age Thresho lds in 0.1V
Increments from 1.6 to 5.5V
■±2% Voltage Threshold Acc uracy
■Operat ing Voltage 0.7 to 6.0V
■Open Drain Output
■Low Supply Current of 0.9µA (typ)
■
Guaranteed OUT Assertio n Down to V
CC
= 0.7V
■Power Supply Transi ent Immunity
■Available in SOT23-3 and SOT323-3 (SC70-3)
packages
■Operat ing Temperature –40 to 85°C.
Fi gur e 1 . P ackages
1. Contact lo c al sales off ice for avai lability.
SOT323-3, SC70-3 (W) (1)
SOT23-3 (WX)
www.st.com
Contents STM1061
2/23
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 Li st of t ables
3/23
List of tables
Table 1. Signal Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Table 2. Pin Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 3. Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 3
Table 4. Operating and AC Measurem ent Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Table 5. DC and AC Characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 6
Table 6. SOT23-3 – 3-lead Small Outline Trans istor Package Mechanical Data. . . . . . . . . . . . . . . 18
Table 7. SOT323-3 (SC70-3) – 3-lead Small Outline Transistor Packag e Mechani cal 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
Lis t 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 Transien t Duration vs. Reset Threshold Overdrive . . . . . . . . . . . . . . . . . . . . . . 11
Figure 12. Detect, Release Volt age vs. Ambient Temperature for VTH– = 3 .4 V . . . . . . . . . . . . . . . . . 11
Figure 13. N-channel Driver O utput Current vs. VDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Figure 14. N-channel Driver Output Current vs. Input Voltage for VDS = 0.5V . . . . . . . . . . . . . . . . . . 1 2
Figure 15. AC Testing Input/Output Waveform s . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 16. Voltage Timing Waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 17. SOT23-3 – 3-lead Small Outlin e Transistor Pack age 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 po wer voltage detector provides monitoring of bat tery, power-supply, and
regulated s ystem voltages. A precision voltage ref erence and comparat or monitors the VCC
input and compares it with a specified voltage threshold condition. When VCC falls below a
specified trip point threshold, the out put (OUT) is forced low and remains asser t ed as long
as the VCC input remains below VTH– + h ysteresis (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 tran sient s on VCC.
This small, low po wer device is ideal for portabl e appli cations and is available in space-
saving SOT23-3 a nd SOT3 23-3 (SC70 -3) packages.
Figure 2. Logic Diagram
Tabl e 1. Signal Names
Figure 3. SOT23-3 Connections
OUT Open Drain Active-Low Output
VCC Supply Vol tage
VSS Ground
AI10477
VCC
STM1061
VSS
OUT
AI10478
23
1
OUT VCC
VSS
Sum m ary Descripti on S TM 1061
6/23
Figure 4. SOT323-3 (SC70-3) Connections
Figure 5. N -C hannel Open Dra i n Output Blo ck Diag ra m
Figure 6. STM 1061N 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 ov erv ie w of the signals connected
to this dev ice.
2.1 OUT (Open Drain)
This is the Open Drain Output. It goes low when VCC drops belo w V TH–, 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 pow er supply. It must be connec ted 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 moni tors system voltages from 1.6 to 5 V in 100mV
increments. The detector is designed to ignore fast transients on VCC and has a vol tage
hysteresis (VHYST). The STM106 1 asserts an output signal (O UT) whenever VCC goes
below the Volt age Detect Threshold (VTH–). The output signal (OUT) sta ys a sse rted until
VCC goes above the Voltage Detect Release (VTH+). Output voltage (VOUT) is guaranteed
valid down to VCC =0.7V at 25°C.
The STM1061h as 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 connec ted to the reset
output line are being supplied. A 10k pull-u p is sufficient in most applications.
The advantages of open drain output is th e ability to connect more open drain outputs in
parallel (wired OR connect ions) as well as con nect the output to a power supply vo ltage
different from VCC.
3.2 Negative-Going VCC Transients and Under shoot
The STM1061 device is relatively im mun e to negative-going VCC transients (glitches). The
graph (see F igure 11 on page 11) indicates the maximum pulse width a negative VCC
transient can have without ca using a reset pulse. As th e magnitud e of the transie nt
increases (further below the threshold), the maximum allowable pulse width decreases . Any
combination of duration and overdrive which lies under the curve will N OT generate a reset
signal.
A 0.1µF bypass ca pacit or mounted as close as possible to the VCC p in 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 T emperature
VCC (V)
ICC (nA)
AI11119b
0
200
400
600
800
1000
1200
1400
0123456
Temp = –40°C
Temp = 25°C
Temp = 85°C
Ambient Temperature (°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 T ime vs. Ambient Tem pe rature
Ambient Temperature: 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
Ambient Temperature: 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 Tempe rature 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
Ambient Temperature (°C)
Detect, Release V oltage: VTH–, VTH+ (V)
AI11124b
3.3
3.4
3.5
3.6
–40 –20 0 20 40 60 80
Detect V oltage , VTH–
Release V oltage , VTH+
Typical Operating Characteristics STM1061
12/23
Figure 13. N-channel Driver Outpu t Current vs. VDS
Figure 14. N-channel Driver Outpu t Current vs. Input Voltage for VDS = 0.5V
Output V oltage: 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
Input V oltage: 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 ma y
cause permanent damage to the de vice. These are stress ratings only and operation of the
device at these or any oth er conditions above those indicated in the Operating sections of
this specification is no t implied. Exposure to Absolute Maximu m Rating conditions for
extended period s may affect device reliability. Refer also to the STM ic roe lect ro nics SURE
Progra m and other relevant quality documents.
Tabl e 3. Absolute Maximum Ratings
Symbol Parameter Value Unit
TSTG Storage Temperat ure ( VCC Off, VBAT Off) –55 to 150 °C
TSLD(1)
1. Reflow at peak temperature of 260°C (total th ermal budget not to exce ed 245°C for greater than 30
seconds).
Lead Solder Temper ature for 10 seconds 260 °C
VIO Input or Output Vol tage –0.3 to VCC +0.3 V
VCC Supp ly Volt a ge –0.3 to 7. 0 V
IOOutput Current 20 mA
PDPower Dissipation 320 mW
DC and AC Param eters STM1061
14/23
6 DC and AC Parameters
This section summari zes the operating mea sure men t conditions, and the DC and AC
characteristics of the device. The paramet ers in t he DC and AC characteristics Tab l es that
follow, are derived from t ests performed under the Measurement Conditions summarized in
Table 4: Operating and AC Measurem ent Conditions. Designers shoul d check th at the
operating condit ions in their circuit matc h the operating conditions when relyi ng on t he
quoted par ameters.
Figure 15. AC Testing Input/Output Waveforms
Table 4. Op erating an d AC Me asure ment Con dit ions
Sym Parameter STM1061 Unit
VCC Supply Voltage 0.7 to 6.0 V
TA Ambient Operati ng Tempera ture –40 to 85 °C
Input Rise and Fall Tim es ≤ 05ns
Input Pul se 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
STM106 1 DC and AC Parameters
15/23
Figure 16. Voltage Ti m i ng 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 Param eters STM1061
16/23
Table 5. DC and AC Cha racteristics
Sym. Description Test Condit ion (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 Curre nt VCC = 3.0V, No Load 0.9 3.0 µA
VCC = 5.5V, No Load 1.1 3.6 µA
IOUT
Output Cur rent, N-chann el
(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 Threshol ds
VTH–
Detect Vol tage (2)
(see Tabl e 9 on pag e 21 for
detailed listing)
2. Oth er VTH- t hreshol d are offered. Minimum order quan tities may apply. C ontac t lo cal sales office for availa bility.
VTH– – 2% VTH– VTH– + 2% V
VTH+ Release Voltage VTH– +
VHYST V
VHYST Threshol d Hysteresis 0.02VTH– 0.05VTH– 0.08VTH– V
tPD VCC to OUT Detect Delay
VCC fal ling from (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 Temper ature
Coefficient ±100 ppm/oC
STM1061 Package Mechanical
17/23
7 Package Mechanical
In order to meet environmenta l requirement s, ST offers these devices in ECOPACK®
packages. These packages have a Lead-fre e second level interc onnect . The category of
second Level Int erconnect is mark ed on t he package and on the inner bo x label, in
compliance wi th JEDEC Standard JES D97.
The maximum ratings related to soldering conditions are also marked on t he inner bo x label.
ECOPACK is an ST tradem ark. ECOPACK spec ifications are available at: www.st.com.
Figure 17. SOT 23-3 – 3-lead Small Outline Transistor Pa ckage Outline
1. Drawing i s 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
Pack age M echan ical STM1061
18/23
Table 6. SOT 23-3 – 3-lead Smal l Outline Transistor Pa ckage 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 (SC7 0-3) – 3-lead Small Outline Transistor Package Outline
1. Drawing i s not to scale.
Tabl e 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-Lo w)
Threshold Volt age (1)
1. O ther thresholds voltage options are off ered. Minimum order quantities may appl y. Contact loc al
sales off ic e for av aila bi lit y.
For other options, or for more infor m ation on any aspect of this device, p lease conta ct
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
S hippi ng M ethod
F = ECOPACK Package, Tape & Reel
STM1061 Part Numbering
21/23
Table 9. Factor y-Trimm ed Thresh olds with Marking Descr iptio n
Suffix Threshold Vol tag e VTH– (V) at TA = 25° C (1)
1. Other VTH- thresholds are offered. Minimum order quantities may apply. Contact local sales office for
availability.
Topside Marking
Min (–2%) Typ Max (+2%)
16 1.568 1.600 1.632 16Nx
17 1.666 1.700 1.734 17Nx
19 1.862 1.900 1.938 19Nx
21 2.058 2.100 2.142 21Nx
22 2.156 2.200 2.244 22Nx
23 2.254 2.300 2.346 23Nx
25 2.450 2.500 2.550 25Nx
26 2.548 2.600 2.652 26Nx
27 2.646 2.700 2.754 27Nx
28 2.744 2.800 2.856 28Nx
29 2.842 2.900 2.958 29Nx
30 2.940 3.000 3.060 30Nx
31 3.038 3.100 3.162 31Nx
34 3.332 3.400 3.468 34Nx
38 3.724 3.800 3.876 38Nx
Revision History STM1061
22/23
9 Revision History
Tabl e 10. Document Revision Hi story
Date Version Description
20-January-
2004 1.0 First Edition
01-Aug-05 1.1 Update Operation section, characterist ics; ins ert new gr aphics; add
ECOPACK i nf ormation ( Figure 7, 8, 9, 10, 11, 12, 13, and 14; Table
Table 5, 8, and 9)
02-Sep-05 1.2 Update characteristics, re mo ve ‘push-pull output’ refer ence (Figure 8,
9, 10, 11, 12, and 16; Ta ble Table 2, , 5, and 8)
19-Oct-05 2.0 Status upgr ade; update characteristics; add Marking information
(Figure 7, 8, 9, 10, 11, 12, 13, and 14; Table Table 8, and 9)
18-Nov-05 3 .0 Updat e characteri stics (Table 3, and 4)
27-Jul-2006 4 Update Chapter : Fea tures, Figure 1, 5, 6, Table 8 and 9.
STM1061
23/23
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y
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