POWER
MANAGEMENT
Supervisors
IMP1810 — Lo w Po w er, 5V µ P R eset
Active LOW, Push-Pull Output
IMP1811 — Lo w Po w er, 5V µ P R eset
Active LOW, Open-Drain Output
IMP181 2 — Lo w Po w er, 5V µ P R eset
Active HIGH, Push-Pull Output
IMP1815 — Lo w Po w er, 3.3V/3.0V µ P R eset
Active LOW, Push-Pull Output
IMP1816 — Lo w Po w er, 3.3V/3.0V µ P R eset
Active LOW, Open-Drain Output
IMP1817 — Lo w Po w er, 3.3V/3.0V µ P R eset
Active HIGH, Push-Pull Output
IMP1 233D — Lo w Po w er, 5V µ P R eset
Active LOW, Open-Drain Output
IMP1 233M — Lo w Po w er, 5V/3.0V µ P R eset
Active LOW, Open-Drain Output
408-432-9100/www.impweb.com
The part numbers and descriptions are linked to the data sheet.
µ
P Super visor Cr oss R ef er ence
µP
Supervisor Products: Low Power Alternatives to Dallas Semiconductor
IMP Ordering
Part Number
IMP1810-5
IMP1810-10
IMP1810-15
IMP1810R-5
IMP1810R-10
IMP1810R-15
IMP1811-5
IMP1811-10
IMP1811-15
IMP1811R-5
IMP1811R-10
IMP1811R-15
IMP1812-5
IMP1812-10
IMP1812-15
IMP1812R-5
IMP1812R-10
IMP1812R-15
IMP1815-5
IMP1815-10
IMP1815-20
IMP1815R-5
IMP1815R-10
IMP1815R-20
IMP1816-5
IMP1816-10
IMP1816-20
IMP1816R-5
IMP1816R-10
IMP1816R-20
IMP1817-5
IMP1817-10
IMP1817-20
IMP1817R-5
IMP1817R-10
IMP1817R-20
IMP1233D-5
IMP1233D-10
IMP1233D-15
IMP1233DZ-5
IMP1233DZ-10
IMP1233DZ-15
IMP1233M-55
IMP1233M-5
IMP1233M-3
IMP1233MS-55
IMP1233MS-5
IMP1233MS-3
RESET
Voltage (V)
4.620
4.370
4.120
4.620
4.370
4.120
4.620
4.350
4.130
4.620
4.350
4.130
4.620
4.350
4.130
4.620
4.350
4.130
3.060
2.880
2.550
3.060
2.880
2.550
3.060
2.880
2.550
3.060
2.880
2.550
3.060
2.880
2.550
3.060
2.880
2.550
4.625
4.375
4.125
4.625
4.375
4.125
4.625
4.375
2.720
4.625
4.375
2.720
RESET
Tolerance (%)
5
10
15
5
10
15
5
10
15
5
10
15
5
10
15
5
10
15
5
10
20
5
10
20
5
10
20
5
10
20
5
10
20
5
10
20
5
10
15
5
10
15
5
10
15
5
10
15
RESET Time
(ms)
150
150
150
150
150
150
15 0
150
150
15 0
150
150
150
150
150
150
150
150
15 0
150
150
15 0
150
150
150
150
150
150
150
150
15 0
150
150
15 0
150
150
35 0
350
350
35 0
350
350
350
350
350
350
350
350
RESET
Polarity
LOW
LOW
LOW
LOW
LOW
LOW
LOW
LOW
LOW
LOW
LOW
LOW
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
LOW
LOW
LOW
LOW
LOW
LOW
LOW
LOW
LOW
LOW
LOW
LOW
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
LOW
LOW
LOW
LOW
LOW
LOW
LOW
LOW
LOW
LOW
LOW
LOW
Push-Pull
Output Stage
X
X
X
X
X
X
Open Drain
Output
8-Pin SO
Package
TO-92
Package
X
X
X
SOT-23
Package
SOT-223
Package
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
ELD/B_t07
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
408-432-9100/www.impweb.com
©
1999 IMP, Inc.
IMP18 1 0
P
OWER
M
ANAGEMENT
Low Power, 5V µP Reset
Key Features
x
Improved Dallas DS1810 replacement
— 50% lower maximum supply current
x
Low Supply Current
— 20µA maximum (5.5V)
x
Automatically restarts a microprocessor after
power failure
x
150ms reset delay after V
CC
returns to an
in-tolerance condition
x
Active LOW power-up reset
x
Precision temperature-compensated voltage
reference and comparator
x
Eliminates external components
x
Low-cost TO-92 package
x
Compact surface mount SOT-23 package
x
Push-Pull output for minimum current drain
x
Operating temperature – 40°C to +85°C
– Active LOW, Push-Pull Output
The IMP1810 supply voltage monitor is an improved, low-power
replacement for the Dallas Semiconductor DS1810. Maximum supply
current over temperature is a low 20µA, representing 50 percent lower
power as compared to the DS1810.
The IMP1810 issues an active LOW reset signal whenever the monitored
supply is out-of-tolerance. A precision reference and comparator circuit
monitor power supply (V
CC
) level. Tolerance level options are 5-, 10- and
15-percent. When an out-of-tolerance condition is detected, an internal
power-fail signal is generated which forces an active LOW reset signal.
After V
CC
returns to an in-tolerance condition, the reset signal remains
active for 150ms to allow the power supply and system microprocessor
to stabilize.
The IMP1810 is designed with a push-pull output stage and operates
over the extended industrial temperature range. Devices are available in
compact surface mount SOT-23 packages and 3-lead TO-92 packages.
Other low power products in this family include the IMP1811/12/15/16/17,
IMP1233D and IMP1233M.
Family Selection Guide
Part
IMP1810
IMP1811
IMP1812
IMP1815
IMP1816
IMP1817
IMP1233D
IMP1233M
Applications
Output
Stage
Push-Pull
Open-Drain
Push-Pull
Push-Pull
Open-Drain
Push-Pull
Open-Drain
Open-Drain
RESET Voltage RESET Time
(V)
(ms)
4.620, 4.370, 4.120
4.620, 4.350, 4.130
4.620, 4.350, 4.130
3.060, 2.880, 2.550
3.060, 2.880, 2.550
3.060, 2.880, 2.550
4.625, 4.375, 4.125
4.625, 4.375, 2.720
150
150
150
150
150
150
350
350
RESET
Polarity
LOW
LOW
HIGH
LOW
LOW
HIGH
LOW
LOW
x
x
x
x
x
x
x
Set-top boxes
Cellular phones
PDAs
Energy management systems
Embedded control systems
Printers
Single board computers
Block Diagram
V
CC
1
VCC
Supply
Tolerance
Bias
Typical Application
IMP1810
IMP1810
+
–
Delay
150ms Typical
Microprocessor
2
RESET
RESET
RESET
Reference
3
GND
©
1999 IMP, Inc.
1810_01.eps
GND
1810_02.eps
408-432-9100/www.impweb.com
1
IMP18 1 0
Pin Configuration
SOT23
RESET
1
IMP1810-X
3
GND
TO-92*
IMP1810-X
V
CC
2
1
1810_03.eps
2
3
1810_04.eps
Pin Descriptions
Pin Number
1
2
3
Name
RESET
V
CC
GND
Function
Active LOW reset output
Power supply input
Ground
Package Marking Code
SOT-23 Package Letter Code
A
B
B
B
3
B
A
B
C
Part
IMP1810
IMP1810
IMP1810
Reset Tolerance
5%
10%
15%
1810_t02.eps
A
1
B
C
D
2
1810_05a.eps
Ordering Information
Device Summary
Part**
Number
IMP1810-5
IMP1810-10
IMP1810-15
IMP1810R-5
IMP1810R-10
IMP1810R-15
Package Marking
RESET
Polarity
LOW
LOW
LOW
LOW
LOW
LOW
B
B
B
A
B
C
X
X
X
X
X
X
RESET RESET RESET Push-Pull
Output Tolerance Time
TO-92* SO -23
Output Package PacTage
Voltage
k
(%)
(ms)
Stage
(V)
4.62
4.37
4.12
4.62
4.37
4.12
5
10
15
5
10
15
150
150
150
150
150
150
A
B
C
D
*
Add /S to Part Number for straight (unformed) leads. (ie. IMP18xx-x/S)
**
Add /T to Part Number for Tape and Reel. (ie. IMP18xx-x/T)
XX = Date code
2
408-432-9100/www.impweb.com
©
1999 IMP, Inc.
IMP18 10
Absolute Maximum Ratings
Voltage on V
CC
. . . . . . . . . . . . . . . . . . . . . . . . –0.5V to 7V
Voltage on RESET . . . . . . . . . . . . . . . . . . . . . –0.5V to V
CC
+ 0.5V
Operating Temperature Range . . . . . . . . . . . –40°C to 85°C
Voltages measured with respect to ground.
These are stress ratings only and functional operation is not implied.
Soldering Temperature . . . . . . . . . . . . . . . . . . 260°C for 10 seconds
Storage Temperature . . . . . . . . . . . . . . . . . . . –55°C to 125°C
Electrical Characteristics
Unless otherwise noted, V
CC
= 1.2V to 5.5V and specifications are over the operating temperature range of – 40°C to +85°C.
All voltages are referenced to ground.
Parameter
Supply Voltage
Output Voltage
Output Current
Output Current
Operating Current
V
CC
Trip Point (IMP1810-5)
V
CC
Trip Point (IMP1810-10)
V
CC
Trip Point (IMP1810-15)
Output Capacitance
V
CC
Detect to RESET Low
V
CC
Slew Rate
(V
CCTP
(MAX) to V
CCTP
(MIN))
V
CC
Slew Rate
(V
CCTP
(MIN) to V
CCTP
(MAX))
V
CC
Detect to RESET High
Symbol
V
CC
V
OH
I
OH
I
OL
I
CC
V
CCTP
V
CCTP
V
CCTP
C
OUT
t
RPD
t
F
t
R
t
RPU
Conditions
I
OUT
< 500µA
Output = 2.4V, V
CC
≥
2.7V
Output = 0.4V, V
CC
≥
2.7V
V
CC
< 5.5V, RESET output open
Min
1.2
V
CC
– 0.5V
+10
Typ
V
CC
– 0.1V
350
8
Max
5.5
Units
V
V
µA
mA
20
4.75
4.49
4.24
10
5
µA
V
V
V
pF
µs
µs
ns
4.50
4.25
4.00
4.62
4.37
4.12
2
300
0
t
r
= 5µs
100
150
300
ms
Notes 1. The t
F
value is for reference in defining values for t
RPD
and should not be considered a requirement for proper operation or use.
©
1999 IMP, Inc.
408-432-9100/www.impweb.com
3
