IMP1232LP 5V Low Power Supervisor
- Selectable trip-point tolerance and watchdog
period
IMP1832 3.3V Low Power Supervisor
- Selectable trip-point tolerance and watchdog
period
- Active LOW and active High push-pull
reset outputs
IMP161, IMP162 Supervisor with Edge Triggered
Manual Reset
IMP1810/1811/1812/1815/1816/1817 Supervisors
IMP1834, IMP1834A and IMP1834D
- Dual 5V/3.3V microprocessor supervisors
IMP1233D and 1233M
- Low power supervisors reduce current
by 60%
IMP690A, IMP692A, IMP802L, IMP802M and
IMP805L
- Microprocessor Supervisors with Watchdog
Timer, Battery Backup Switch and Power Fail Indicator
IMP706P/R/S/T/J, IMP708P/R/S/T/J
- 3/3.3/4V Microprocessor Supervisors with
Power Fail Indicator and Improved Watchdog Timer
IMP705, IMP706, IMP707, IMP708, IMP813L
- Microprocessor Supervisors with Watchdog
Timer and Power Fail Indicator
IMP809, IMP810, IMP811, IMP812
- Low Power, Low Cost Microprocessor Supervisors,
75% Lower Power Supply Current than Maxim
|
E-mail requests should be sent to sales@ds-imp.com.cn
IMP1232LP 5V Low Power Supervisor
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.
Key Features
- 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
Data Sheets
IMP1232LP |
|
Back to top
IMP1832 3.3V Low Power Supervisor
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.
Key Features
- 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
Data Sheets
IMP1832 |
|
Back to top
IMP161,
IMP162 Supervisor with Edge Triggered Manual
Reset
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.
Key
Features
- Edge
triggered manual reset input
- Single
pulse output
- 49µS
minimum MR disable period after reset
- CMOS/TTL
logic or switch interface
- Debounced
input
- Low
supply current extends battery life
- 6µA/15µA
typ/max at 5.5V
- 4.5µA/10µA
typ/max at 3.6V
- 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
Data Sheets
IMP161, IMP162 |
|
Back to top
IMP1810/1811/1812/1815/1816/1817 Supervisors
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.
Product
Summary Table
All
devices operate over an operating temperature range of -40 degrees
centigrade to +85 degrees centigrade.
IMP
Part
|
Output
Stage |
RESET
Polarity |
System
Supply
|
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 |
Data Sheets
IMP1810/11/12/15/16/17, IMP1233D,
IMP1233M |
|
Back to top
IMP1834,
IMP1834A, IMP1834D
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
IMP
Part |
Output
Structure
|
Reset
Polarity |
IMP1834 |
Push-Pull |
LOW |
IMP1834A |
Open Drain |
LOW |
IMP1834D |
Push-Pull |
HIGH |
Data Sheets
IMP1834, IMP1834A, IMP1834D |
|
Back to top
IMP1233D
and 1233M
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.
Product
Summary Table
IMP
Part
|
Reset
Threshold |
Maximum
Supply Current
|
Package
|
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 |
Data Sheets
Back to top
IMP690A,
IMP692A, IMP802L/M, and IMP805L
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.
Product
Summary Table
IMP
Part No.
|
RESET
Polarity
|
Threshold
Voltage |
Power
Fail Threshold Accuracy |
Watchdog
Function |
IMP690A |
LOW |
4.65V |
4% |
YES |
IMP692A |
LOW |
4.40V |
4% |
YES |
IMP802L |
LOW |
4.65V |
2% |
YES |
IMP802M |
LOW |
4.40V |
2% |
YES |
IMP805L |
HIGH |
4.40V |
4% |
YES |
Data Sheets
IMP690A, IMP692A, IMP802L, IMP802M,
IMP805L |
|
Back to top
IMP706P/R/S/T/J,
IMP708P/R/S/T/J
- 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.
Feature
Summary
IMP
Part No. |
RESET
Polarity |
Manual
RESET |
Watchdog
Timer |
Threshold
Voltage |
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 |
Data Sheets
IMP706P, IMP706R/S/T/J, IMP708R/S/T/S/J |
|
Back to top
IMP705,
IMP706, IMP707, IMP708, and IMP813L
Supervisors with Watchdog Timer and Power Fail Indicator
- 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. |