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PDF STM6700 Data sheet ( Hoja de datos )
| Número de pieza | STM6700 | |
| Descripción | (STM6700 / STM6710) Microprocessor Supervisors And Reset ICs | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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STM6700
STM6710
Low-voltage, high-accuracy, triple/quad voltage
microprocessor supervisory circuit in SOT package
Features
■ Accurate monitoring of up to four supply
voltages
■ Precision factory-set reset threshold options for
1.8 V, 2.5 V, 3.0 V, 3.3 V and 5.0 V
■ Adjustable input threshold voltage = 0.62 V
with 1.5% accuracy
■ Low power consumption (<35 µA)
■ Reset timeout period 200 ms (typ) - STM6710
■ 5 µs propagation delay ( STM6700)
■ Open-drain RESET output with a weak pull-up
(10 µA)
■ RESET - active low - valid to V1IN = 1 V or
V2IN = 1 V
■ Immune to power supply transients
■ Guaranteed from –40 °C to +85 °C
■ Small 6-pin SOT23 package
■ ROHS compliant
SOT23-6 (WB)
Applications
■ Telecommunications
■ Set-top boxes
■ Networking equipment
■ Server/workstations
■ Desktop and notebook computers
■ Data storage equipment
www.DataSThaebetl4eU1.c.om Device summary
Part number
V1IN
(V)
V2IN
(V)
STM6710DWB6F
5
3.3
STM6710FWB6F Adj
3.3
STM6710KWB6F Adj
3.3
STM6710LWB6F Adj
3.3
V3IN
(V)
1.8
2.5
1.8
1.8
V4IN
(V)
Adj
1.8
Adj
Adj
Power supply
tolerance
Temperature range
5% –40 °C to +85 °C
5% –40 °C to +85 °C
10% –40 °C to +85 °C
5% –40 °C to +85 °C
Package
SOT23-6
SOT23-6
SOT23-6
SOT23-6
December 2009
Doc ID 16887 Rev 1
1/22
www.st.com
1
1 page  
STM6700, STM6710
1 Description
Description
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 as shown in Table 1 on page 1 are available. Table 8 on
page 20 provides the complete selector guide for this device.
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 SOT-23 package, the STM6710
devices can help to lower system cost, reduce board space requirements, and increase the
reliability of multi-voltage systems.
Low VCC detection circuitry protects the user's system from low voltage conditions, resetting
the system when VCC or any of the other monitored power supply voltages fall below their
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 VCC.
The output is open drain with a weak internal pull-up to the monitored V2IN supply (or VCC
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.
www.DataSheet4U.com The STM6710 output remains valid as long as V1IN or V2IN exceeds 1 V. For the STM6700
and STM6710 the condition is to have VCC above 2 V.
The STM6700/STM6710 are available in a 6-pin small SOT23 package and operate over the
temperature range of –40 °C to +85 °C (refer to Table 8 on page 20 for the selector guide).
Doc ID 16887 Rev 1
5/22
5 Page 
STM6700, STM6710
Operation
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 in Figure 7 below
can 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 the following formula which
is also shown in Figure 7.
or solved in terms of R1:
VTHx
= 0.62
V × (R1 + R2)
R2
R1=
R2⎜⎝⎛
VTHx
0.62V
−
1⎟⎠⎞
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
www.DataSheet4U.com
VxINTH
R1
R2
R1 = R2 [(VxINTH/0.62V)–1]
VREF = 0.62V
AM04623v1
Doc ID 16887 Rev 1
11/22
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet STM6700.PDF ] | |
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