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IMP1232LP
5V Low Power Supervisor
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¡¤ Selectable trip-point tolerance
and watchdog period |
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IMP1832
3.3V Low Power Supervisor |
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¡¤ Selectable trip-point tolerance
and watchdog period |
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¡¤ Active LOW and active High push-pull
reset outputs |
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IMP161,
IMP162 Supervisor with Edge Triggered Manual Reset |
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¡¤ Low Power Supervisors |
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IMP1810/1811/1812/1815/1816/1817
Supervisors |
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¡¤ Low Power ¥ìP Supervisors |
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IMP1834,
IMP1834A and IMP1834D |
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¡¤ Dual 5V/3.3V microprocessor supervisors |
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IMP1233D
and 1233M |
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¡¤ Low power supervisors reduce current
by 60% |
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IMP690A,
IMP692A, IMP802L, IMP802M and IMP805L |
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¡¤ Microprocessor Supervisors with
Watchdog Timer, Battery Backup Switch and Power Fail Indicator |
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IMP706P/R/S/T/J,
IMP708P/R/S/T/J |
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¡¤ 3/3.3/4V Microprocessor Supervisors
with Power Fail Indicator and Improved Watchdog Timer |
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IMP705,
IMP706, IMP707, IMP708, IMP813L |
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¡¤ Microprocessor Supervisors with
Watchdog Timer and Power Fail Indicator |
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IMP809,
IMP810, IMP811, IMP812 |
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¡¤ Low Power, Low Cost Microprocessor
Supervisors, 75% Lower Power Supply Current than Maxim |
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IMP1232LP 5V Low Power Supervisor |
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The IMP1232LP/LPS microprocessor supervisor can halt
and restart a "hung-up" or "stalled" microprocessor,
restart a microprocessor after a power failure, and debounce and interface
a manual push-button microprocessor reset switch. The low-power supervisors
feature 40% lower supply current than
the pin compatible Dallas Semiconductor DS1232LP/LPS devices.
Precision temperature compensated reference and comparator circuits
monitor the 5V, VCC input voltage. During power-up or when the VCC
power supply falls outside selectable tolerance limits, both the
RESET and RESET (bar, active LOW) become active. When VCC rises
above the threshold voltage, the reset signals remain active for
an additional 250ms minimum, allowing the power supply and system
microprocessor to stabilize. The trip point tolerance signal, TOL,
selects the trip level tolerance to be either 5- or 10-percent.
Each device has both a push-pull, active HIGH reset output and
an open drain, active LOW reset output. A debounced manual reset
input activates the reset outputs for a minimum period of 250ms.
Also included is a watchdog timer to stop and restart a microprocessor
that is "hung-up". Watchdog time-out periods of 150ms,
610ms and 1,200ms are user selectable. If the ST input is not strobed
LOW before the time-out period expires, a reset is issued.
Devices are available in 8-pin DIP, 8/16-pin SO and compact 8-pin
MicroSO packages. |
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¡¤ Key Features |
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- User selectable threshold tolerance via TOL pin
- 5% for 4.74V max. threshold and 10% for 4.49V
- Selectable watchdog timer period via TD pin: 150ms/610ms/1.2sec
- 40% lower power supply current than Dallas
- 30m A maximum (IMP) vs 50m A for Dallas
- Dual reset outputs: Active LOW (open drain) and Active HIGH
- 250ms minimum reset period
- 8-pin package options: DIP, SO and compact MicroSO
- MicroSO footprint 50% smaller than the SO
- 16-pin package option: SO
- Debounced manual reset pin
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¡¤ Data Sheets |
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¡¤ IMP1232LP  |
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IMP1832 3.3V Low Power Supervisor |
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The IMP1832 microprocessor supervisor can halt and
restart a "hung-up" or "stalled" microprocessor,
restart a microprocessor after a power failure, and debounce and interface
a manual push-button microprocessor reset switch. The low-power supervisors
feature 40% lower supply current than the pin compatible Dallas
Semiconductor DS1832 devices.
Precision temperature compensated reference and comparator circuits
monitor the 3/3.3VV, VCC input voltage. During power-up or when
the VCC power supply falls outside selectable tolerance limits,
both the active HIGH and active LOW reset outputs become active.
When VCC rises above the threshold voltage, the reset signals remain
active for an additional 250ms minimum, allowing the power supply
and system microprocessor to stabilize. The trip point tolerance
signal, TOL, selects the trip level tolerance to be either 10- or
20-percent.
Each device has both a push-pull active HIGH reset and a push-pull
active LOW output. A debounced manual reset input activates the
reset outputs for a minimum period of 250ms.
Also included is a watchdog timer to stop and restart a microprocessor
that is "hung-up". Watchdog time-out periods of 150ms,
610ms and 1,200ms are user selectable. If the ST input is not strobed
LOW before the time-out period expires, a reset is issued.
Devices are available in 8-pin DIP, 8-pin SO and compact 8-pin
MicroSO packages. |
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¡¤ Key Features |
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- User selectable threshold tolerance via TOL pin
- 10% for 2.97V max. threshold and 20% for 2.64V max. threshold
- Selectable watchdog timer period via TD pin: 150ms/610ms/1.2sec
- 40% lower power supply current than Dallas
- 20m A maximum (IMP) vs 35m A for Dallas
- Dual reset outputs: Active LOW (open drain) and Active HIGH
- 250ms minimum reset period
- 8-pin package options: DIP, SO and compact MicroSO
- MicroSO footprint 50% smaller than the SO
- Debounced manual reset pin
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¡¤ Data Sheets |
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¡¤ IMP1832  |
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IMP161, IMP162 Supervisor with Edge Triggered Manual Reset |
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The IMP161 and IMP162 are low power supervisory circuits
that monitor power supplies in microprocessor based systems. If the
power supply drops below the reset threshold level, a reset is asserted
and remains asserted for at least 800ms after VCC has risen above
the reset threshold. An improved manual reset architecture gives the
system designer additional flexibility.
The debounced manual reset input is negative edge triggered. The
reset pulse period generated by a MR transition is a minimum of
800ms and maximum of 2 sec. In addition, the MR input signal is
blocked for an additional 49S minimum after the reset pulse ends.
During the MR disable period, the microcontroller is guaranteed
a time period free of additional manual reset signals. During this
period DRAM contents can be refreshed or other critical system tasks
undertaken.
Low supply current makes the IMP161/162 ideal for use in battery
operated equipment. With 3V supplies power consumption is 8m W typically
and 30m W maximum.
The IMP161 has an open-drain, active-LOW RESET output and uses
an external pull-up resistor. The IMP162 has an active-HIGH RESET
output. Available in compact 4-pin SOT-143 packages, six voltage
thresholds are offered to support 3.0V, 3.3V and 5V power systems.
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¡¤ Key Features |
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- Edge triggered manual reset input
- Single pulse output
- 49¥ìS minimum MR disable period after reset
- CMOS/TTL logic or switch interface
- Debounced input
- Low supply current extends battery life
- 6¥ìA/15¥ìA typ/max at 5.5V
- 4.5¥ìA/10¥ìA typ/max at 3.6V
- Long reset period
- 0.8 sec minimum, 2 sec maximum
- Two reset polarity options
- IMP161: Active LOW, open-drain
- IMP162: Active HIGH
- Pinout matches the IMP811/812
- Small 4-pin SOT-143 package
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¡¤ Data Sheets |
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¡¤ IMP161, IMP162  |
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IMP1810/1811/1812/1815/1816/1817 Supervisors |
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The IMP1810, IMP1811, IMP1812, IMP1815, IMP1816 and
IMP1817 microprocessor supervisory and reset circuits are lower power,
direct replacements for devices originally offered by Dallas Semiconductor.
The IMP devices reduce supply current requirements by up to 57 percent
when compared to Dallas Semiconductor devices. Maximum supply current
is as low as 15 microamperes. Typical supply current is 8 microamperes.
Both open-drain and push-pull reset output stages with active HIGH
or active LOW reset signals are offered. No external components
are required, which reduces the overall system cost and complexity
while increasing the system reliability. The reset period is 150
milliseconds.
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¡¤ Product Summary Table |
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All devices operate over an operating temperature
range of -40 degrees centigrade to +85 degrees centigrade. |
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IMP
Part |
Output
Stage |
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IMP1810 |
Push-Pull |
LOW |
5V |
IMP1811 |
Open-Drain |
LOW |
5V |
IMP1812 |
Push-Pull |
HIGH |
5V |
IMP1815 |
Push-Pull |
LOW |
3/3.3V |
IMP1816 |
Open-Drain |
LOW |
3/3.3V |
IMP1817 |
Push-Pull |
HIGH |
3/3.3V |
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¡¤ Data Sheets |
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¡¤ IMP1810/11/12/15/16/17, IMP1233D,
IMP1233M  |
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IMP1834, IMP1834A, IMP1834D |
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The IMP1834 microprocessor supervisors serve applications
where both 3.3-volt and 5-volt power supplies must be monitored. Compared
to competitive offerings, IMP devices operate with up to 40 percent
lower supply current.
40 Percent Lower Supply Current
The IMP1834 family offers up to 40 percent lower supply current.
The 5-volt supply current is typically 16 microamperes and is 30-microamperes
maximum. This compares to a 50-microampere maximum specification
for Dallas Semiconductor devices.
Selectable Reset Threshold Tolerance
The IMP1834 independently monitors 5-volt and 3.3-volt power supplies.
Users can independently select the 5-volt and 3.3-volt tolerance
thresholds through two select pins. For a 3.3-volt supply, tolerance
levels are 10 percent or 20 percent and for 5-volt systems, 5 percent
or 10 percent. When an out-of-tolerance power supply voltage is
detected, the proper reset output asserts and remains active for
350 milliseconds after the supply returns to an in-tolerance condition.
Manual Pushbutton Reset Input
A single debounced push button reset input is included. When pulled
low by a mechanical switch, both 5-volt and 3.3-volt reset outputs
are asserted and remain active for 350 milliseconds after the pushbutton
is released.
Two Output Stage Configurations
The IMP1834 family consists of three devices. Like the IMP1834,
the IMP1834D devices have a push-pull output stage but have active
LOW reset signals. The IMP1834A differs from the IMP1834D by its
open drain output structure.
Output Configuration Summary
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IMP
Part |
Output
Structure |
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IMP1834 |
Push-Pull |
LOW |
IMP1834A |
Open-Drain |
LOW |
IMP1834D |
Push-Pull |
HIGH |
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¡¤ Data Sheets |
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¡¤ IMP1834, IMP1834A, IMP1834D  |
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IMP1233D and 1233M |
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The IMP1233D and IMP1233M are low cost, low power
microprocessor supervisors. Maximum supply current is 20 microamperes
at 5 volts or 15 microamperes at 3.6 volts. Compared to competitive
devices available from Dallas Semiconductor, IMP1233D and IMP1233M
devices offer over 60 percent lower supply current. Threshold voltages
are available for 5-, 3.3- and 3-volt systems.
The IMP1233 devices have an open-drain output structure with an
on-chip pull-up resistor. No external components are needed. An
active-low reset signal is issued whenever the monitored supply
voltage is below the reset threshold. After the supply voltage returns
to an in-tolerance condition, the reset signal remains active for
350 milliseconds, allowing the power supply and system microprocessor
to stabilize.
All devices operate over an operating temperature range of -40
degrees centigrade to +85 degrees centigrade.
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¡¤ Product Summary Table |
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IMP
Part |
Reset
Threshold |
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IMP1233MS-55 |
4.625V |
20 microamperes |
8-pin,
SO |
IMP1233MS-5 |
4.375V |
20 microamperes |
8-pin,
SO |
IMP1233MS-3 |
2.720V |
20 microamperes |
8-pin,
SO |
IMP1233DZ-5 |
4.625V |
20 microamperes |
4-pin,
SOT-223 |
IMP1233DZ-15 |
4.125V |
20 microamperes |
4-pin,
SOT-223 |
IMP1233DZ-10 |
4.375V |
20 microamperes |
4-pin,
SOT-223 |
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¡¤ Data Sheets |
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IMP690A, IMP692A, IMP802L/M, and IMP805L |
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¡¤ New Microprocessor Supervisors
Offer 70% Lower Power at 50% Lower Price
The IMP690A, IMP692A, IMP802L, IMP802M, and IMP805L are pin-for-pin
replacements for the similarly numbered devices from Maxim Integrated
Products, with the addition of thermal and short-circuit protection
while offering 70 percent lower operating power and 50 percent lower
list pricing.
Using a 0.8 micron CMOS process, the new IMP supervisors integrate
a battery backup switchover circuit and 20 ohm power switch, microprocessor/microcontroller
watchdog function, microprocessor reset and power failure detection
functions. In addition, the IMP designs add short-circuit protection
and thermal protection to all members of the family. The new IMP supervisors
are specified at 100 microamperes maximum supply current consumption,
compared to the 350-microampere limit published by Maxim, a reduction
of 70 percent in power usage. |
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¡¤ Product Summary Table |
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IMP
Part No. |
RESET
Polarity |
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Power Fail Threshold Accuracy
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IMP690A |
LOW |
4.65V |
4% |
YES |
IMP692A |
LOW |
4.40V
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4% |
YES |
IMP802L |
LOW |
4.65V
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2% |
YES |
IMP802M |
LOW |
4.40V
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2% |
YES |
IMP805L |
HIGH |
4.40V
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4% |
YES |
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¡¤ Data Sheets |
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¡¤ IMP690A, IMP692A, IMP802L, IMP802M,
IMP805L  |
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IMP706P/R/S/T/J, IMP708P/R/S/T/J |
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¡¤ 3/3.3/4V Microprocessor Supervisors
with Power Fail Indicator and Improved Watchdog Timer
The IMP706P/R/S/T/J and IMP708R/S/T/J microprocessor supervisors are
designed for 3.0-, 3.3- and 4.0-volt power supply rails. Compared
to pin-compatible devices available from Maxim Integrated Products
Integrated Products, the low reset threshold IMP706 and IMP708 microprocessor
supervisors feature 30-percent lower supply current and include a
4-volt supply monitoring option. Maximum supply current is a low 140
microamperes. Another functional enhancement is that the internal
watchdog timer can be disabled, an often needed capability during
system development and debugging. IMP
Watchdog Function Enhanced
The IMP706 watchdog timer was improved by adding a disable function.
It is often desirable to disable the watchdog timer during the system
development phase or in troubleshooting a system in the field.
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Feature Summary |
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IMP
Part No. |
RESET
Polarity |
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IMP706P |
LOW |
YES |
YES |
2.63V |
IMP706R/S/T/J |
HIGH |
YES |
YES |
2.63V/2.93V/3.08V/
4.0V |
IMP708R/S/T/J |
LOW and
HIGH |
YES |
NO |
2.63V/2.93V/3.08V/
4.0V |
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¡¤ Data Sheets |
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¡¤ IMP706P, IMP706R/S/T/J, IMP708R/S/T/S/J
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IMP705, IMP706, IMP707, IMP708, and IMP813L
Supervisors with Watchdog Timer and Power Fail Indicator |
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¡¤ 60% Lower Supply Current than Maxim
Devices ¡¤ MicroSO Package
The IMP705, IMP706, IMP707, IMP708, and IMP813L integrate power supply
monitoring and microprocessor/microcontroller watchdog functions into
compact 8-pin MicroSO packages. In addition, compared to pin-compatible
devices available from Maxim Integrated Products, the IMP devices
have reduced supply current requirements by 60 percent. Maximum supply
current is a low 140 microamperes.
The new IMP supervisor family offers several functional options. Each
device generates a reset signal during power-up, power-down and during
brownout conditions. Designed to monitor a 5 volt power supply, 4.65
volt and 4.4 volt threshold devices are offered. A separate 1.25 volt
threshold, power-fail detection circuit can check battery levels or
non-5 volt supplies.
All devices have a manual reset input. The IMP705/706/813L feature
a watchdog timer output that is set if the watchdog input is not
triggered within 1.6 seconds.
The IMP813L has the same pin-out and functions as the IMP705 but
has an active-HIGH reset output. The IMP707/IMP708 have both active-HIGH
and active-LOW reset outputs instead of a watchdog function.
The IMP705, IMP706, and IMP813L supervisors monitor the power supply
and battery in microprocessor and digital systems. A reset signal
is generated whenever the supply voltage drops below 4.65 volts
for the IMP705, IMP707 and IMP813L. The IMP706 and IMP708 generate
a reset for supply voltages below 4.40 volts.
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¡¤ Product Summary Table |
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IMP
Part No. |
RESET
Polarity |
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IMP705 |
LOW |
YES |
YES
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4.65V
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IMP706 |
LOW |
YES |
YES
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4.40V
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IMP707 |
LOW and
HIGH |
YES |
YES
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4.65V
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IMP708 |
LOW and
HIGH |
YES |
YES
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4.40V
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IMP813 |
HIGH |
YES |
YES
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4.65V
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¡¤ Data Sheets |
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¡¤ IMP705, IMP706, IMP707, IMP708,
IMP 813L  |
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IMP809, IMP810, IMP811, IMP812 |
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¡¤ Low Power, Low Cost Microprocessor
Supervisors ¡¤ 75% Lower Power Supply Current
than Maxim
The IMP809, IMP810, IMP811 and IMP812 supervisors monitor the power
supply of a microprocessor or microcontroller. A supervisor chip prevents
the microprocessor or microcontroller from executing software instructions
or enabling hardware incorrectly because of low power supply voltage.
Each supervisor is available with six reset threshold options that
range from 2.63V to 4.63 V with 1.5%, or better, accuracy. |
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¡¤ Supervisor Selection Guide |
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IMP809 |
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Package Pins |
3 |
3 |
4
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4
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Package Type |
SOT-23
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SOT-23
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SOT-143
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SOT-143
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Manual Reset |
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Active-HIGH RESET
Output |
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Active-LOW RESET
Output |
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If the monitored power supply voltage drops below
the chip-reset threshold, the supervisor generates a RESET signal
to the microprocessor or microcontroller. The RESET signal is maintained
active for a minimum time, 140 milliseconds, after the supply goes
back above the reset threshold voltage. The IMP809 and IMP810 RESET
output signals are opposite polarity. The IMP811 and IMP812 supervisors
add a Manual Reset (MR) input for push-button RESET activation and
also have opposite polarity RESET output signals.
The IMP supervisors were designed for low current consumption to support
battery operated systems. Power supply current is 15 microamperes
maximum for the 4.00V, 4.38V and 4.63V threshold devices that serve
5V systems and 10 microamperes maximum for the 2.63V, 2.93V and 3.08V
threshold devices that are designed for 3V systems. Compared to the
4.63V threshold Maxim MAX809, the IMP809, manufactured on an advanced
0.8-micron analog CMOS process, reduces maximum unloaded supply current
by 75%. |
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¡¤ Data Sheets |
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¡¤ IMP809/810  |
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¡¤ IMP811/812  |
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