The STM6710 is a precision voltage monitoring supervisor with the capability to monitor
triple/quad voltages and combines competitive reset threshold accuracy with low power
consumption.
Factory-trimmed reset threshold options for monitoring 5.0 V, 3.3 V, 2.5 V and 1.8 V supplies
with –5% and –10% tolerances are available.
If a monitored supply voltage input falls below the minimum voltage threshold, a single
active low output is asserted, triggering a system reset.
This device can be configured to support an external manual reset input using minimal
external components.
Monitoring up to four different voltages in a small 6-lead SOT23 package, the STM6710
devices can help to lower system cost, reduce board space requirements, and increase the
reliability of multi-voltage systems.
Low V
the system when V
detection circuitry protects the user's system from low voltage conditions, resetting
CC
or any of the other monitored power supply voltages fall below their
CC
respective minimum voltage thresholds. The reset signal remains asserted until all of these
voltages return to proper operating levels and stabilize.
STM6710 includes internally fixed monitoring voltages for 5.0 V, 3.3 V, 3.0 V, 2.5 V and 1.8 V
supplies with –5% and –10% tolerances.
This device will function as a triple monitoring voltage supervisor (STM6700) when V2IN is
used as V
The output is open drain with a weak internal pull-up to the monitored V2IN supply (or V
CC
.
CC
in the case of STM6710Q) of typically 10 µA. Once all voltages rise above the selected
threshold level, the STM6710 reset signal remains low for the reset timeout period of
200 ms (typical). The STM6700 acts as a voltage detector with a propagation delay of 5 µs
after all monitored voltages exceed their thresholds.
The STM6710 output remains valid as long as V1IN or V2IN exceeds 1 V. For the STM6700
and STM6710 the condition is to have V
above 2 V.
CC
The STM6700/STM6710 are available in a 6-pin small SOT23 package and operate over the
temperature range of –40 to +85 °C.
Doc ID 16887 Rev 25/21
DescriptionSTM6700, STM6710
Figure 1.Logic diagram
V2IN / V
CC
V1IN
(1)
V3IN
STM6700
RESET
STM6710
V4IN
1. Open drain
Table 2.Signal names
PinNameTypeFunction (STM6710 / STM6700)
1V1INInputInput voltage 1
V2IN
2
V
3V3INInputInput voltage 3
Input/supply
CC
Input voltage 2 and device power supply pin
For the triple monitor voltage STM6700 and for STM6710Q, this pin
is the V
supply pin and it is not monitored
CC
AM04617v1
4V4INInputInput voltage 4
5GNDSupplyGround
6RESET
Output
Active low, open drain RESET
input drops below the specified threshold. Once all inputs rise above
their threshold voltages, RESET
(STM6710) before going high.
For the triple monitor (STM6700) it remains low for 5 µs
(propagation delay - no t
The open drain RESET
(STM6710) or V
(STM6700/STM6710Q).
CC
output. Output goes low when any
remains low for typical 200 ms
).
REC
has a weak (10 µA) internal pull-up to V2IN
Figure 2.Pinout SOT23-6
SOT23-6
(1)
AM04618v1
1. Open drain
V1IN
V2IN (V
CC
V3IN
)
1
STM6700
2
STM6710
3
6
5
4
RESET
GND
V4IN
Note:For the STM6700 and STM6710Q, pin 2 is a fixed VCC, thereby making it a triple voltage
reset, while the STM6710 is a quad voltage reset.
6/21Doc ID 16887 Rev 2
STM6700, STM6710Description
Pin descriptions
V1IN, V3IN,V4IN (VxIN)
The VxIN pins are used for nominal input voltages for 1.8 V, 2.5 V and 5.0 V supplies. The
voltage at this pin is compared against an internal factory-programmed voltage trip point,
Vrst.
RESET
is first asserted low when the device is initially powered and VxIN < 1 V and then at
any time thereafter when VxIN falls below Vrst. The device is designed with typical
hysteresis of 0.3% with respect to its threshold to help prevent oscillation due to noise and is
immune to brief power supply transients.
V2IN
The V2IN is used to power the STM6710 device. In normal operations V2IN is also
monitored. For STM6710Q and STM6700 variations this pin is the V
power supply but is
CC
not monitored.
Ground (VSS)
This pin (GND) is the ground pin for the power supply and is tied to VSS.
RESET
The RESET output is an open drain output that asserts low whenever a monitored supply
falls below the minimum threshold. STM6710 provides an extended reset timeout period of
typically 200 ms.
Figure 3.Functional block diagram
1. The STM6700 and STM6710Q are powered via the V2IN input which is the supply voltage. When this pin is
V
, the input is not monitored.
CC
Doc ID 16887 Rev 27/21
OperationSTM6700, STM6710
2 Operation
The STM6710 is capable of monitoring up to 4 voltages in a multisupply application. The
device is available in several preset voltage thresholds for power supplies of 1.8 V, 2.5 V,
3.0 V, 3.3 V and 5.0 V. The STM6710 is powered by the V2IN pin which is also a monitored
voltage, thus making this a quad voltage monitor. The STM6710Q and STM6700 use this
pin as V
voltage inputs. If any of the monitored input voltage falls below its associated threshold, the
active low reset output is asserted and remains low as long as V1IN or V2IN remains above
which is not monitored and thereby limits these devices to three adjustable
CC
STM6710
V1IN
SUPPLIES
TO BE
MONITORED
V2IN (V
V3IN
V4IN
2.1 RESET output configuration
The RESET output asserts low if a monitored input voltage drops below its threshold. This is
an open drain with a weak internal pull-up to V2IN or the V
However, many applications may not require an external pull-up resistor. In case a pull-up
resistor is required and is connected to a voltage ranging from 0 to 5.5 V (as shown in
Figure 5), it can overdrive the weak internal pull-up. The STM6710 has built-in circuitry to
prevent this reverse current flow to V2IN under this condition.
Figure 5.Interface to external pull-up using a different supply voltage
CC
GND
)
RESET
µP
AM04620v1
supply, and is typically 10 µA.
CC
8/21Doc ID 16887 Rev 2
STM6700, STM6710Operation
Figure 6.RESET output diagram
VxIN
V
THx
V
THx
RESET
90%
10%
t
RD
t
RP
AM04622v1
Doc ID 16887 Rev 29/21
OperationSTM6700, STM6710
2.2 Adjustable thresholds (input configurations)
The STM6700/STM6710 may be configured to monitor several options with adjustable reset
thresholds. The threshold voltages at each adjustable input VxIN is typically 0.62 V. Thus to
monitor a voltage > 0.62 V, a resistor divider network as shown inFigure 7can be used.
The STM6710 allows users to customize the minimum voltage sense level with adjustable
reset thresholds. The threshold voltage at each adjustable input VxIN is typically 0.62 V.
For example, the user can adjust the voltage input threshold (VTHx) for V1IN, V3IN and
V4IN inputs. To do this, connect an external resistor divider network to the VxIN pin in order
to set the trip point to some other voltage above 620 mV according to Equation 1 and
Equation 2 which is also shown in Figure 7.
Equation 1
R1 R2+()
---------- ------------- --- -
×=
R2
V
THX
⎛⎞
------------- -- - 1–
⎝⎠
0.62 V
or solved in terms of R1:
Equation 2
V
THx
R1R2
0.62V
=
The STM6700/STM6710 have an input current of less than ±0.2 µA (±0.4 µA for VIN1)
on their adjustable inputs, therefore resistor values of up to 100 kΩ can be used for R2
with < 1% error.
Figure 7.Adjustable thresholds monitoring
10/21Doc ID 16887 Rev 2
STM6700, STM6710Operation
2.3 Unused inputs
Connect unused monitor inputs to a supply voltage greater in magnitude than their specified
threshold voltages. For unused VxIN adjustable inputs connect a 1 MΩ resistor between
unused input and V2IN or (V
) to limit the bias current. Use V2IN for normal operation
CC
(device power supply pin). Do not connect unused monitor inputs to ground or allow them to
float.
2.4 Adding manual reset capability
Figure 8 shows a circuit which can be used to add manual reset capability for the STM6710.
Depressing the push button switch short-circuits the analog input to ground and initiates
a RESET
RESET
improve noise immunity. Figure 8 shows the addition of the manual reset capability.
Figure 8.Adding manual reset capability for STM6710 input
pulse. The switch must be open for at least 140 ms in order to deassert the
output. No external switch debounce is required. A small capacitor may be used to
V1IN
V2IN
V3IN
R1
R2
V4IN
(ADJUSTABLE
INPUT)
RESET
GND
AM04624v1
Doc ID 16887 Rev 211/21
Maximum ratingsSTM6700, STM6710
3 Maximum ratings
Stressing the device above the rating listed in Ta bl e 3 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 Table 4 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
SymbolParameterValueUnit
T
STG
(1)
T
SLD
V
IO
V
CC
I
O
θ
JA
1. Reflow at peak temperature of 260 °C. The time above 255 °C must not exceed 30 seconds.
Storage temperature (VCC off)–55 to +150°C
Lead solder temperature for 10 seconds260°C
Input or output voltage–0.3 to VCC +0.3V
Supply voltage–0.3 to +7.0 VV
Output current20mA
Thermal resistance (junction to ambient)N/A°C/W
12/21Doc ID 16887 Rev 2
STM6700, STM6710DC and AC parameters
4 DC and AC parameters
This section summarizes the DC and AC characteristics of the device. The parameters in
Ta bl e 5 are derived from tests performed under the test 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
ParameterConditionsUnit
V2IN supply voltage (T
V
supply voltage (for STM6700 and STM6710Q)2.0 to 5.5
CC
Ambient operating temperature (T
Table 5.DC and AC characteristics
= 0 to 85 °C)1.0 to 5.5
A
= -40 to 85 °C)1.2 to 5.5
A
)-40 to 85°C
A
Alt.SymbolParameterTest conditionsMin.Typ.
T
= 0 to +85 °C1.05.5
V2INOperating voltage
V
CC
V
STM6700 and
CC
STM6710Q
A
T
= –40 to +85 °C1.25.5
A
2.05.5
VxIN nominal input voltage
(1.8 V, 2.5 V, 5.0 V supplies)
V2IN = nominal input voltage
IxINInput current
for 3.0 V and 3.3 V supplies
V1IN = 0 to 0.85 V
(for adjustable thresholds)
V3IN, V4IN = 0 to 0.85 V
(for adjustable thresholds)
(1)
Max.Unit
2540
55115
0.4
0.2
VV2IN supply voltage (T
V
µA
I
CC
I2NI2N input current
STM6700 and STM6710Q only
V
= 5.5 V
CC
3550µA
Doc ID 16887 Rev 213/21
DC and AC parametersSTM6700, STM6710
Table 5.DC and AC characteristics (continued)
Alt.SymbolParameterTest conditionsMin.Typ.
Voltage thresholds
5 V (–5%)4.5004.6304.750
5 V (–10%)4.2504.3804.450
3.3 V (–5%)3.0003.0803.150
3.3 V (–10%)2.8502.9303.000
(1)
Max.Unit
VrstV
VrstxinV
V
HYST
Reset
t
RD
t
RP
t
PD
TH
REF
TCVTH
t
RPD
t
REC
V
OL
V
OH
VxIN falling
3.0 V (–5%)2.7002.7802.850
3.0 V (–10%)2.5502.6302.70
2.5 V (–5%)2.2502.3202.380
2.5 V (–10%)2.1302.1902.250
1.8 V (–5%)1.6201.6701.710
1.8 V (–10%)1.5301.5801.620
V1IN, V2IN, V3IN,
V4IN adj. reset
VxIN decreasing0.6110.6200.629V
threshold voltage
Hysteresis of V
TH
0.3%V
Reset threshold
temperature
60ppm/°C
coefficient
VTH to reset
asserted delay
Reset timeout
delay
VxIN falling at 10 mV/µs from VTH
to (V
–50 mV)
TH
STM6710140200280ms
30µs
Propagation delaySTM6700 only5µs
= 2 mA0.3
SINK
= 1.2 mA0.4
SINK
= 50 µA,
SINK
= 6 µA, RESET
= –6 µA, RESET
0.8 x
V
CC
0.8 x
V2IN
0.3
RESET output low
RESET output
high
V2IN, V
V2IN, V
= 5 V, I
CC
= 2.5 V, I
CC
V2IN = 1.0 V, I
T
= 0 to +85 °C
A
V
≥2.0 V, I
CC
SOURCE
deasserted (STM6700)
V
≥V
TH
, I
SOURCE
CC
deasserted
V
TH
V
RESET output
I
OH
high source
V2IN ≥
2.0 V, RESET deasserted 10µA
current
1. V2IN = 1 V to 5.5 V, TA = –40 to +85 °C, unless otherwise stated. Typical values are at V2IN = 3.0 V to 3.3 V,
TA = +25 °C.
14/21Doc ID 16887 Rev 2
STM6700, STM6710Package mechanical data
5 Package mechanical data
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK
®
packages, depending on their level of environmental compliance. ECOPACK®
®
is an ST trademark.
Doc ID 16887 Rev 215/21
Package mechanical dataSTM6700, STM6710
Figure 9.SOT23 – 6-lead small outline transistor package mechanical outline
Table 6.SOT23 – 6-lead small outline transistor package mechanical data
Dimensions
Symbol
mminches
Min.Typ.Max.Min.Typ.Max.
A0.91.450.0350.057
A100.1000.0039
A20.91.30.0350.0512
b0.350.50.0140.02
c0.090.20.0040.008
D2.83.050.110.120
E1.51.750.0590.0689
e0.950.037
H2.630.1020.118
L0.10.60.0040.024
θ0°10°0°10°
7049714_F
16/21Doc ID 16887 Rev 2
STM6700, STM6710Package mechanical data
Figure 10. SOT23-6 landing pattern
AM04854v1
Figure 11. Carrier tape for SOT23-6
D
T
A
TOP COVER
TAPE
K
0
Table 7.Carrier tape dimensions for SOT23-6
PackageWDEP
1.50
+0.10/
–0.00
1.75
±0.10
SOT23-6
8.00
+0.30/
–0.10
0
CENTER LINES
OF CAVITY
0
4.00
±0.10
P
2
B
0
USER DIRECTION OF FEED
P
2.00
±0.10
FA0B
2
3.50
±0.05
P
0
±0.10
3.23
P
1
3.17
±0.10
E
F
W
AM03073v1
K
0
1.37
±0.10
P
0
4.00
±0.10
1
±0.013
TUnit
0.254
Bulk
qty.
mm 3000
Doc ID 16887 Rev 217/21
Part numberingSTM6700, STM6710
6 Part numbering
Table 8.Ordering information scheme
Example:STM6710FWB6F
Device type
STM6700
STM6710
Threshold combination
Refer to Ta bl e 9
Package
WB = SOT23-6
(1)
Temperature range
6 = –40 to +85 °C
Shipping method
F = ECOPACK
1. Contact local ST sales office for availability
®
package, tape and reel packing
For other options, or for more information on any aspect of this device, please contact the
ST sales office nearest you.
The STM6700/STM6710 are designed for various voltage thresholds and configurations,
however not all variations are shown in Tabl e 9. Please contact local ST sales office for
availability.
Table 9.STM6700/STM6710 device selector summary
Part name
Monitored pins
V1IN
V2IN
(V)
(V)
V3IN
(V)
V4IN
(V)
Supply
pin
t
(ms)
REC
Supply
tolerance
(%)
Top
marking
Comments
STM6710AWB6F53.32.5Adj.V2IN20010D6BAContact ST sales office
STM6710BWB6F53.32.5Adj.V2IN2005D6BBContact ST sales office
STM6710CWB6F53.31.8Adj.V2IN20010D6BCContact ST sales office
STM6710DWB6F53.31.8Adj.V2IN2005D6BDAvailable
STM6710EWB6FAdj.3.32.51.8V2IN20010D6BEContact ST sales office
STM6710FWB6FAdj.3.32.51.8V2IN2005D6BFAvailable
STM6710GWB6F53.3Adj.Adj.V2IN20010D6BGContact ST sales office
STM6710HWB6F53.3Adj.Adj.V2IN2005D6BHContact ST sales office
STM6710IWB6FAdj.3.32.5Adj.V2IN20010D6BIContact ST sales office
STM6710JWB6FAdj.3.32.5Adj.V2IN2005D6BJAvailable
STM6710KWB6FAdj.3.31.8Adj.V2IN20010D6BKAvailable
STM6710LWB6FAdj.3.31.8Adj.V2IN2005D6BLAvailable
STM6710MWB6FAdj.32.5Adj.V2IN20010D6BMContact ST sales office
STM6710NWB6FAdj.32.5Adj.V2IN2005D6BNContact ST sales office
STM6710OWB6FAdj.31.8Adj.V2IN20010D6BOContact ST sales office
STM6710PWB6FAdj.31.8Adj.V2IN2005D6BPContact ST sales office
STM6710QWB6FAdj.V
STM6700WB6FAdj.V
Adj.Adj.V
CC
Adj.Adj.V
CC
N/AN/AD6BQContact ST sales office
CC
N/AN/AD6BZContact ST sales office
CC
Doc ID 16887 Rev 219/21
Revision historySTM6700, STM6710
8 Revision history
Table 10.Document revision history
DateRevisionChanges
09-Dec-20091Initial release.
Added Ta bl e 4 and cross-reference to Ta bl e 4 in Section 3,
15-May-20122
updated Section 1, Ta b l e 9, minor corrections throughout
document.
20/21Doc ID 16887 Rev 2
STM6700, STM6710
y
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