A1 PROs IMP1232LPS 5v î¼p power supplly moniittor and ressett ciircuiitt Datasheet

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
RESET
Voltage (V)
RESET
Tolerance (%)
RESET Time
(ms)
RESET
Polarity
Push-Pull
Output Stage
Open Drain
Output
8-Pin SO
Package
TO-92
Package
SOT-23
Package
IMP1810-5
4.620
5
150
LOW
X
X
IMP1810-10
4.370
10
150
LOW
X
X
IMP1810-15
4.120
15
150
LOW
X
X
IMP1810R-5
4.620
5
150
LOW
X
X
IMP1810R-10
4.370
10
150
LOW
X
X
IMP1810R-15
4.120
15
150
LOW
X
IMP1811-5
4.620
5
15 0
LOW
X
X
IMP1811-10
4.350
10
150
LOW
X
X
IMP1811-15
4.130
15
150
LOW
X
X
IMP1811R-5
4.620
5
15 0
LOW
X
X
IMP1811R-10
4.350
10
150
LOW
X
X
IMP1811R-15
4.130
15
150
LOW
X
IMP1812-5
4.620
5
150
HIGH
X
X
IMP1812-10
4.350
10
150
HIGH
X
X
IMP1812-15
4.130
15
150
HIGH
X
X
IMP1812R-5
4.620
5
150
HIGH
X
X
IMP1812R-10
4.350
10
150
HIGH
X
X
IMP1812R-15
4.130
15
150
HIGH
X
IMP1815-5
3.060
5
15 0
LOW
X
X
IMP1815-10
2.880
10
150
LOW
X
X
IMP1815-20
2.550
20
150
LOW
X
X
IMP1815R-5
3.060
5
15 0
LOW
X
X
IMP1815R-10
2.880
10
150
LOW
X
X
IMP1815R-20
2.550
20
150
LOW
X
IMP1816-5
3.060
5
150
LOW
X
X
IMP1816-10
2.880
10
150
LOW
X
X
IMP1816-20
2.550
20
150
LOW
X
X
IMP1816R-5
3.060
5
150
LOW
X
X
IMP1816R-10
2.880
10
150
LOW
X
X
IMP1816R-20
2.550
20
150
LOW
X
IMP1817-5
3.060
5
15 0
HIGH
X
X
IMP1817-10
2.880
10
150
HIGH
X
X
IMP1817-20
2.550
20
150
HIGH
X
X
IMP1817R-5
3.060
5
15 0
HIGH
X
X
IMP1817R-10
2.880
10
150
HIGH
X
X
X
SOT-223
Package
X
X
X
X
X
IMP1817R-20
2.550
20
150
HIGH
IMP1233D-5
4.625
5
35 0
LOW
X
X
X
IMP1233D-10
4.375
10
350
LOW
X
X
IMP1233D-15
4.125
15
350
LOW
X
X
IMP1233DZ-5
4.625
5
35 0
LOW
X
X
IMP1233DZ-10
4.375
10
350
LOW
X
X
IMP1233DZ-15
4.125
15
350
LOW
X
IMP1233M-55
4.625
5
350
LOW
X
X
X
IMP1233M-5
4.375
10
350
LOW
X
X
IMP1233M-3
2.720
15
350
LOW
X
X
IMP1233MS-55
4.625
5
350
LOW
X
X
IMP1233MS-5
4.375
10
350
LOW
X
X
IMP1233MS-3
2.720
15
350
LOW
X
X
ELD/B_t07
408-432-9100/www.impweb.com
© 1999 IMP, Inc.
IMP18 1 0
POWER MANAGEMENT
Low Power, 5V µP Reset
Key Features
– 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 (VCC) 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 VCC 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.
◆ Improved Dallas DS1810 replacement
— 50% lower maximum supply current
◆ Low Supply Current
— 20µA maximum (5.5V)
◆ Automatically restarts a microprocessor after
power failure
◆ 150ms reset delay after VCC returns to an
in-tolerance condition
◆ Active LOW power-up reset
◆ Precision temperature-compensated voltage
reference and comparator
◆ Eliminates external components
◆ Low-cost TO-92 package
◆ Compact surface mount SOT-23 package
◆ Push-Pull output for minimum current drain
◆ Operating temperature – 40°C to +85°C
Family Selection Guide
Applications
RESET Voltage RESET Time
(V)
(ms)
Part
IMP1810
IMP1811
IMP1812
IMP1815
IMP1816
IMP1817
IMP1233D
IMP1233M
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
Output
Stage
RESET
Polarity
Push-Pull
Open-Drain
Push-Pull
Push-Pull
Open-Drain
Push-Pull
Open-Drain
Open-Drain
LOW
LOW
HIGH
LOW
LOW
HIGH
LOW
LOW
◆
◆
◆
◆
◆
◆
◆
Set-top boxes
Cellular phones
PDAs
Energy management systems
Embedded control systems
Printers
Single board computers
Block Diagram
Typical Application
VCC
1
VCC
Supply
Tolerance
Bias
IMP1810
IMP1810
+
–
Microprocessor
2
Delay
150ms Typical
RESET
Reference
RESET
RESET
GND
3
GND
© 1999 IMP, Inc.
1810_01.eps
408-432-9100/www.impweb.com
1810_02.eps
1
IMP18 1 0
Pin Configuration
SOT23
RESET
TO-92*
1
IMP1810-X
IMP1810-X
3
VCC
GND
2
1
2
3
1810_03.eps
1810_04.eps
Pin Descriptions
Pin Number
Name
Function
1
RESET
Active LOW reset output
2
VCC
Power supply input
3
GND
Ground
Package Marking Code
3
SOT-23 Package Letter Code
A
B
Part
Reset Tolerance
B
B
B
A
B
C
IMP1810
IMP1810
IMP1810
5%
10%
15%
A
B
C
1
D
2
1810_t02.eps
1810_05a.eps
Ordering Information
Device Summary
Part**
Number
Package Marking
RESET RESET RESET Push-Pull
Output
-92* SOT-23
rance Time
Output PTaOck
Voltage Tole(%
age Package
)
(ms)
Stage
(V)
IMP1810-5
4.62
5
150
l
l
LOW
IMP1810-10
4.37
10
150
l
l
LOW
l
A
B
C
D
IMP1810-15
4.12
15
150
l
IMP1810R-5
4.62
5
150
l
l
LOW
B
A
X
X
IMP1810R-10
4.37
10
150
l
l
LOW
B
B
X
X
IMP1810R-15
4.12
15
150
l
l
LOW
B
C
X
X
* 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)
2
RESET
Polarity
408-432-9100/www.impweb.com
LOW
XX = Date code
© 1999 IMP, Inc.
IMP18 10
Absolute Maximum Ratings
Voltage on VCC . . . . . . . . . . . . . . . . . . . . . . . . –0.5V to 7V
Voltage on RESET . . . . . . . . . . . . . . . . . . . . . –0.5V to VCC + 0.5V
Operating Temperature Range . . . . . . . . . . . –40°C to 85°C
Soldering Temperature . . . . . . . . . . . . . . . . . . 260°C for 10 seconds
Storage Temperature . . . . . . . . . . . . . . . . . . . –55°C to 125°C
Voltages measured with respect to ground.
These are stress ratings only and functional operation is not implied.
Electrical Characteristics
Unless otherwise noted, VCC = 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
Symbol
Conditions
Supply Voltage
VCC
Output Voltage
VOH
IOUT < 500µA
Output Current
IOH
Output = 2.4V, VCC ≥ 2.7V
Output Current
IOL
Output = 0.4V, VCC ≥ 2.7V
Operating Current
ICC
VCC < 5.5V, RESET output open
Min
Typ
1.2
VCC – 0.5V
Max
Units
5.5
V
VCC – 0.1V
V
350
µA
+10
mA
8
20
µA
VCC Trip Point (IMP1810-5)
VCCTP
4.50
4.62
4.75
V
VCC Trip Point (IMP1810-10)
VCCTP
4.25
4.37
4.49
V
VCC Trip Point (IMP1810-15)
VCCTP
4.00
4.12
4.24
V
Output Capacitance
C OUT
10
pF
VCC Detect to RESET Low
t RPD
5
µs
2
VCC Slew Rate
(VCCTP (MAX) to VCCTP (MIN))
tF
300
µs
VCC Slew Rate
(VCCTP (MIN) to VCCTP (MAX))
tR
0
ns
VCC Detect to RESET High
t RPU
t r = 5µs
100
150
300
ms
Notes 1. The tF value is for reference in defining values for tRPD and should not be considered a requirement for proper operation or use.
© 1999 IMP, Inc.
408-432-9100/www.impweb.com
3
IMP18 1 0
Application Information
Operation – Power Monitor
Output Conditions
The DS1810 detects out-of-tolerance power supply conditions. It
resets a processor during power-up, power-down and issues a
reset to the system processor when the monitored power supply
voltage is below the reset threshold. When an out-of-tolerance VCC
voltage is detected, the RESET signal is asserted. On power-up,
RESET is kept active (LOW) for approximately 150ms after the
power supply voltage has reached the selected tolerance. This
allows the power supply and microprocessor to stabilize before
RESET is released.
The IMP1810 active LOW reset signal is valid as long as VCC
remains above 1.2V. The RESET output on the IMP1810 uses a
push-pull drive stage that can maintain a valid output below 1.2V.
To sink current with VCC below 1.2V, a resistor can be connected
from the reset pin (RESET) to Ground (see Figure 1). This configuration will give a valid value on the RESET output with VCC
approaching 0V. During both power up and down, this configuration will draw current when RESET is in the high state. A value
of 100kΩ should be adequate to maintain a valid condition.
tR
VCCTP (MAX)
VCCTP
VCCTP (MIN)
IMP1810
Microprocessor
RESET
VCC
tRPU
RESET
VOH
100k
RESET
1810_06.eps
1810_07.eps
Figure 2. Timing Diagram: Power-Up
Figure 1. RESET Valid to 0V VCC
tF
VCC
VCCTP (MAX)
VCCTP
VCCTP (MIN)
tRPD
RESET
VOL
1810_08.eps
Figure 3. Timing Diagram: Power-Down
4
408-432-9100/www.impweb.com
© 1999 IMP, Inc.
IMP18 1 1
POWER MANAGEMENT
Low Power, 5V µP Reset
Key Features
– Active LOW, Open-Drain Output
The IMP1811 supply voltage monitor is an improved, low-power
replacement for the Dallas Semiconductor DS1811. Maximum supply
current over temperature is a low 20µA, representing 50 percent lower
power as compared to the DS1811.
The IMP1811 issues an active LOW reset signal whenever the monitored
supply is out-of-tolerance. A precision reference and comparator circuit
monitor power supply (VCC) 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 VCC returns to an in-tolerance condition, the reset signal remains
active for 150ms to allow the power supply and system microprocessor
to stabilize.
The IMP1811 is designed with a open-drain 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 IMP1810/12/15/16/17,
IMP1233D and IMP1233M.
◆ Improved Dallas DS1811 replacement
— 50% lower maximum supply current
◆ Low Supply Current
— 20µA maximum (5.5V)
◆ Automatically restarts a microprocessor after
power failure
◆ 150ms reset delay after VCC returns to an
in-tolerance condition
◆ Active LOW power-up reset
◆ Precision temperature-compensated voltage
reference and comparator
◆ Eliminates external components
◆ Low-cost TO-92 package
◆ Compact surface mount SOT-23 package
◆ Operating temperature – 40°C to +85°C
Applications
Family Selection Guide
RESET Voltage RESET Time
(V)
(ms)
Part
IMP1810
IMP1811
IMP1812
IMP1815
IMP1816
IMP1817
IMP1233D
IMP1233M
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
Output
Stage
RESET
Polarity
Push-Pull
Open-Drain
Push-Pull
Push-Pull
Open-Drain
Push-Pull
Open-Drain
Open-Drain
LOW
LOW
HIGH
LOW
LOW
HIGH
LOW
LOW
◆
◆
◆
◆
◆
◆
◆
Set-top boxes
Cellular phones
PDAs
Energy management systems
Embedded control systems
Printers
Single board computers
Block Diagram
Typical Application
VCC
1
VCC
Supply
Tolerance
Bias
IMP1811
5.5kΩ
2
+
–
IMP1811
RESET
Delay
150ms Typical
Microprocessor
RESET
RESET
GND
Reference
3
GND
© 1999 IMP, Inc.
1811_02.eps
1811_01.eps
408-432-9100/www.impweb.com
1
IMP18 1 1
Pin Configuration
SOT23
RESET
TO-92*
1
IMP1811-X
IMP1811-X
3
VCC
GND
2
1
1811_03.eps
2
3
1811_04.eps
Pin Descriptions
Pin Number
Name
Function
1
RESET
Active LOW reset output
2
VCC
Power supply input
3
GND
Ground
Package Marking Code
3
SOT-23 Package Letter Code
A
B
Part
Reset Tolerance
C
C
C
A
B
C
IMP1811
IMP1811
IMP1811
5%
10%
15%
A
B
C
1
D
2
1811_t02.eps
1811_05a.eps
Ordering Information
Device Summary
RESET
ESET RESET
Part*** Output TR
o
l
erance Time
Number Voltage
(%)
(ms)
(V)
Package Marking
Open-Drain** TO-92* SOT-23 RESET
Output
Package Package Polarity
Stage
IMP1811-5
4.62
5
150
l
l
LOW
IMP1811-10
4.35
10
150
l
l
LOW
IMP1811-15
4.13
15
150
l
l
LOW
B
C
D
IMP1811R-5
4.62
5
150
l
l
LOW
C
A
X
X
IMP1811R-10
4.35
10
150
l
l
LOW
C
B
X
X
IMP1811R-15
4.13
15
150
l
l
LOW
C
C
X
X
* Add /S to Part Number for straight (unformed) leads. (ie. IMP18xx-x/S)
** Internal 5.5kΩ resistor pull up.
*** Add /T to Part Number for Tape and Reel. (ie. IMP18xx-x/T)
2
A
408-432-9100/www.impweb.com
XX = Date code
© 1999 IMP, Inc.
IMP18 1 1
Absolute Maximum Ratings
Voltage on VCC . . . . . . . . . . . . . . . . . . . . . . . . –0.5V to 7V
Voltage on RESET . . . . . . . . . . . . . . . . . . . . . –0.5V to VCC + 0.5V
Operating Temperature Range . . . . . . . . . . . –40°C to 85°C
Soldering Temperature . . . . . . . . . . . . . . . . . . 260°C for 10 seconds
Storage Temperature . . . . . . . . . . . . . . . . . . . –55°C to 125°C
Voltages measured with respect to ground.
These are stress ratings only and functional operation is not implied.
Electrical Characteristics
Unless otherwise noted, VCC = 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
Symbol
Conditions
Supply Voltage
VCC
Output Voltage
VOH
IOUT < 500µA
Output Current
IOL
Output = 0.4V, VCC ≥ 2.7V
ICC
VCC < 5.5V, RESET output open
Min
Typ
1.2
VCC – 0.5V
Max
Units
5.5
V
VCC – 0.1V
V
+10
mA
8
20
µA
VCC Trip Point (IMP1811-5)
VCCTP
4.50
4.62
4.75
V
VCC Trip Point (IMP1811-10)
VCCTP
4.25
4.35
4.49
V
VCC Trip Point (IMP1811-15)
VCCTP
4.00
4.13
4.24
V
RP
3.5
5.5
7.5
kΩ
10
pF
100
150
250
ms
2
5
Operating Current
Internal Pull-Up Resistor
Output Capacitance
C OUT
RESET Active Time
t RESET
VCC Detect to RESET Low
t RPD
µs
VCC Slew Rate
(VCCTP (MAX) to VCCTP (MIN))
tF
300
µs
VCC Slew Rate
(VCCTP (MIN) to VCCTP (MAX))
tR
0
ns
VCC Detect to RESET High
t RPU
t r = 5µs
100
150
300
ms
Notes 1. The tF value is for reference in defining values for tRPD and should not be considered a requirement for proper operation or use.
© 1999 IMP, Inc.
408-432-9100/www.impweb.com
3
IMP18 1 1
Application Information
Operation – Power Monitor
The IMP1811 detects out-of-tolerance power supply conditions. It
resets a processor during power-up, power-down and issues a
reset to the system processor when the monitored power supply
voltage is below the reset threshold. When an out-of-tolerance VCC
voltage is detected, the RESET signal is asserted. On power-up,
RESET is kept active (LOW) for approximately 150ms after the
power supply voltage has reached the selected tolerance. This
allows the power supply and microprocessor to stabilize before
RESET is released.
tF
VCC
VCCTP (MAX)
VCCTP
VCCTP (MIN)
tRPD
RESET
tR
VCCTP (MIN)
VCCTP (MAX)
VCCTP
VOL
1811_08.eps
VCC
Figure 2. Timing Diagram: Power-Down
tRPU
VOH
RESET
1811_07.eps
Figure 1. Timing Diagram: Power-Up
4
408-432-9100/www.impweb.com
© 1999 IMP, Inc.
IMP18 1 2
POWER MANAGEMENT
Low Power, 5V µP Reset
Key Features
– Active HIGH, Push-Pull Output
The IMP1812 supply voltage monitor is an improved, low-power
replacement for the Dallas Semiconductor DS1812. Maximum supply
current over temperature is a low 20µA, representing over 50 percent
lower power as compared to the DS1812.
The IMP1812 issues an active HIGH reset signal whenever the monitored supply is out-of-tolerance. A precision reference and comparator
circuit monitor power supply (VCC) 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 HIGH reset
signal. After VCC returns to an in-tolerance condition, the reset signal
remains active for 150ms to allow the power supply and system microprocessor to stabilize.
The IMP1812 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 IMP1810/11/15/16/17,
IMP1233D and IMP1233M.
◆ Improved Dallas DS1812 replacement
— Over 50% lower maximum supply current
◆ Low Supply Current
— 20µA maximum (5.5V)
◆ Automatically restarts a microprocessor after
power failure
◆ 150ms reset delay after VCC returns to an
in-tolerance condition
◆ Active HIGH power-up reset
◆ Precision temperature-compensated voltage
reference and comparator
◆ Eliminates external components
◆ Low-cost TO-92 package
◆ Compact surface mount SOT-23 package
◆ Push-Pull output for minimum current drain
◆ Operating temperature – 40°C to +85°C
Family Selection Guide
RESET Voltage RESET Time
(V)
(ms)
Part
IMP1810
IMP1811
IMP1812
IMP1815
IMP1816
IMP1817
IMP1233D
IMP1233M
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
Output
Stage
RESET
Polarity
Push-Pull
Open-Drain
Push-Pull
Push-Pull
Open-Drain
Push-Pull
Open-Drain
Open-Drain
LOW
LOW
HIGH
LOW
LOW
HIGH
LOW
LOW
Applications
◆
◆
◆
◆
◆
◆
◆
Set-top boxes
Cellular phones
PDAs
Energy management systems
Embedded control systems
Printers
Single board computers
Block Diagram
Typical Application
VCC
1
VCC
Supply
Tolerance
Bias
IMP1812
IMP1812
+
–
Microprocessor
Delay
150ms
Typical
2
RESET
RESET
RESET
GND
Reference
3
GND
© 1999 IMP, Inc.
1812_02.eps
1812_01.eps
408-432-9100/www.impweb.com
1
IMP18 1 2
Pin Configuration
SOT23
RESET
TO-92*
1
IMP1812-X
IMP1812-X
3
VCC
GND
2
1
1812_03.eps
2
3
1812_04.eps
Pin Descriptions
Pin Number
Name
Function
1
RESET
2
VCC
Power supply input
3
GND
Ground
Active HIGH reset output
Package Marking Code
SOT-23 Package Letter Code
3
A
B
Part
Reset Tolerance
D
D
D
A
B
C
IMP1812
IMP1812
IMP1812
5%
10%
15%
A
B
C
1
D
2
1812_t02.eps
1812_05a.eps
Ordering Information
Device Summary
Part**
Number
Package Marking
RESET RESET RESET Push-Pull
Output
-92* SOT-23
rance Time
Output PTaOck
Voltage Tole(%
age Package
)
(ms)
Stage
(V)
A
B
C
D
IMP1812-5
4.62
5
150
l
l
HIGH
IMP1812-10
4.35
10
150
l
l
HIGH
IMP1812-15
4.13
15
150
l
l
HIGH
IMP1812R-5
4.62
5
150
l
l
HIGH
D
A
X
X
IMP1812R-10
4.35
10
150
l
l
HIGH
D
B
X
X
IMP1812R-15
4.13
15
150
l
l
HIGH
D
C
X
X
* 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)
2
RESET
Polarity
408-432-9100/www.impweb.com
XX = Date code
© 1999 IMP, Inc.
IMP18 1 2
Absolute Maximum Ratings
Voltage on VCC . . . . . . . . . . . . . . . . . . . . . . . . –0.5V to 7V
Voltage on RESET . . . . . . . . . . . . . . . . . . . . . –0.5V to VCC + 0.5V
Operating Temperature Range . . . . . . . . . . . –40°C to 85°C
Soldering Temperature . . . . . . . . . . . . . . . . . . 260°C for 10 seconds
Storage Temperature . . . . . . . . . . . . . . . . . . . –55°C to 125°C
Voltages measured with respect to ground.
These are stress ratings only and functional operation is not implied.
Electrical Characteristics
Unless otherwise noted, VCC = 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
Symbol
Conditions
Supply Voltage
VCC
Output Voltage
VOH
IOUT < 500µA
Output Current
IOH
Output = 2.4V, VCC ≥ 2.7V
Output Current
IOL
Output = 0.4V, VCC ≥ 2.7V
Operating Current
ICC
VCC < 5.5V, RESET output open
Min
Typ
1.2
VCC – 0.5V
Max
Units
5.5
V
VCC – 0.1V
V
350
µA
+10
mA
8
20
µA
VCC Trip Point (IMP1812-5)
VCCTP
4.50
4.62
4.75
V
VCC Trip Point (IMP1812-10)
VCCTP
4.25
4.35
4.49
V
VCC Trip Point (IMP1812-15)
VCCTP
4.00
4.13
4.24
V
10
pF
100
150
250
ms
2
5
Output Capacitance
C OUT
RESET Active Time
t RESET
VCC Detect to RESET Low
t RPD
µs
VCC Slew Rate
(VCCTP (MAX) to VCCTP (MIN))
tF
300
µs
VCC Slew Rate
(VCCTP (MIN) to VCCTP (MAX))
tR
0
ns
VCC Detect to RESET High
t RPU
t R = 5µs
100
150
300
ms
Notes 1. The tF value is for reference in defining values for tRPD and should not be considered a requirement for proper operation or use.
© 1999 IMP, Inc.
408-432-9100/www.impweb.com
3
IMP1 8 1 2
Application Information
Operation – Power Monitor
The IMP1812 detects out-of-tolerance power supply conditions. It
resets a processor during power-up, power-down and issues a
reset to the system processor when the monitored power supply
voltage is below the reset threshold. When an out-of-tolerance VCC
voltage is detected, the RESET signal is asserted. On power-up,
RESET is kept active (HIGH) for approximately 150ms after the
power supply voltage has reached the selected tolerance. This
allows the power supply and microprocessor to stabilize before
RESET is released.
tF
VCC
VCCTP (MAX)
VCCTP
tRPD
VOH
tR
VCCTP (MIN)
VCCTP (MIN)
RESET Slews with VCC
RESET
VCCTP (MAX)
VCCTP
1812_07.eps
Figure 2. Timing Diagram: Power-Down
VIN
tRPU
RESET
VOL
1812_06.eps
Figure 1. Timing Diagram: Power-Up
4
408-432-9100/www.impweb.com
© 1999 IMP, Inc.
IMP18 1 5
POWER MANAGEMENT
Low Power, 3.3V/3.0V µP Reset
– Active LOW, Push-Pull Output
The IMP1815 supply voltage monitor is an improved, low-power
replacement for the Dallas Semiconductor DS1815. Maximum supply
current over temperature is a low 15µA, representing over 50 percent
lower power as compared to the DS1815.
The IMP1815 issues an active LOW reset signal whenever the monitored
supply is out-of-tolerance. A precision reference and comparator circuit
monitor power supply (VCC) level. Tolerance level options are 5-, 10- and
20-percent. When an out-of-tolerance condition is detected, an internal
power-fail signal is generated which forces an active LOW reset signal.
After VCC returns to an in-tolerance condition, the reset signal remains
active for 150ms to allow the power supply and system microprocessor
to stabilize.
The IMP1815 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 IMP1810/11/12/16/17,
IMP1233D and IMP1233M.
Key Features
◆ Improved Dallas DS1815 replacement
— Over 50% lower maximum supply current
◆ Low Supply Current
— 20µA maximum (5.5V)
— 15µA maximum (3.6V)
◆ Automatically restarts a microprocessor after
power failure
◆ 150ms reset delay after VCC returns to an
in-tolerance condition
◆ Active LOW power-up reset
◆ Precision temperature-compensated voltage
reference and comparator
◆ Eliminates external components
◆ Low-cost TO-92 package
◆ Compact surface mount SOT-23 package
◆ Push-Pull output for minimum current drain
◆ Operating temperature – 40°C to +85°C
Family Selection Guide
RESET Voltage RESET Time
(V)
(ms)
Part
IMP1810
IMP1811
IMP1812
IMP1815
IMP1816
IMP1817
IMP1233D
IMP1233M
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
Output
Stage
RESET
Polarity
Push-Pull
Open-Drain
Push-Pull
Push-Pull
Open-Drain
Push-Pull
Open-Drain
Open-Drain
LOW
LOW
HIGH
LOW
LOW
HIGH
LOW
LOW
Applications
◆
◆
◆
◆
◆
◆
◆
Set-top boxes
Cellular phones
PDAs
Energy management systems
Embedded control systems
Printers
Single board computers
Block Diagram
Typical Application
VCC
1
VCC
Supply
Tolerance
Bias
IMP1815
IMP1815
Microprocessor
+
–
2
Delay
150ms Typical
RESET
RESET
RESET
GND
Reference
3
GND
© 1999 IMP, Inc.
1815_02.eps
1815_01.eps
408-432-9100/www.impweb.com
1
IMP18 1 5
Pin Configuration
SOT23
RESET
TO-92*
1
IMP1815-X
IMP1815-X
3
VCC
GND
2
1
1815_03.eps
2
3
1815_04.eps
Pin Descriptions
Pin Number
Name
Function
1
RESET
2
VCC
Power supply input
3
GND
Ground
Active LOW reset output
Package Marking Code
3
SOT-23 Package Letter Code
A
B
Part
Reset Tolerance
E
E
E
A
B
D
IMP1815
IMP1815
IMP1815
5%
10%
20%
A
B
C
1
D
2
1815_05a.eps
1815_t02.eps
Ordering Information
Device Summary
Part**
Number
Package Marking
RESET RESET RESET Push-Pull
Output
-92* SOT-23
rance Time
Output PTaOck
Voltage Tole(%
age Package
)
(ms)
Stage
(V)
A
B
C
D
IMP1815-5
3.06
5
150
l
l
LOW
IMP1815-10
2.88
10
150
l
l
LOW
IMP1815-20
2.55
20
150
l
l
LOW
IMP1815R-5
3.06
5
150
l
l
LOW
E
A
X
X
IMP1815R-10
2.88
10
150
l
l
LOW
E
B
X
X
IMP1815R-20
2.55
20
150
l
l
LOW
E
D
X
X
* 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)
2
RESET
Polarity
408-432-9100/www.impweb.com
XX = Date code
© 1999 IMP, Inc.
IMP18 1 5
Absolute Maximum Ratings
Voltage on VCC . . . . . . . . . . . . . . . . . . . . . . . . –0.5V to 7V
Voltage on RESET . . . . . . . . . . . . . . . . . . . . . –0.5V to VCC + 0.5V
Operating Temperature Range . . . . . . . . . . . –40°C to 85°C
Soldering Temperature . . . . . . . . . . . . . . . . . . 260°C for 10 seconds
Storage Temperature . . . . . . . . . . . . . . . . . . . –55°C to 125°C
Voltages measured with respect to ground.
These are stress ratings only and functional operation is not implied.
Electrical Characteristics
Unless otherwise noted, VCC = 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
Symbol
Conditions
Supply Voltage
VCC
Output Voltage
VOH
IOUT < 500µA
Output Current
IOH
Output = 2.4V, VCC ≥ 2.7V
Output Current
IOL
Output = 0.4V, VCC ≥ 2.7V
Operating Current
ICC
VCC < 5.5V, RESET output open
ICC
VCC ≤ 3.6V, RESET output open
Min
Typ
1.2
VCC – 0.5V
Max
Units
5.5
V
VCC – 0.1V
V
350
µA
+10
mA
8
20
µA
6
15
µA
VCC Trip Point (IMP1815-5)
VCCTP
2.98
3.06
3.15
V
VCC Trip Point (IMP1815-10)
VCCTP
2.80
2.88
2.97
V
VCC Trip Point (IMP1815-20)
VCCTP
2.47
2.55
2.64
V
Output Capacitance
C OUT
10
pF
VCC Detect to RESET
t RPD
5
µs
Operating Current
VCC Slew Rate
(VCCTP (MAX) to VCCTP (MIN))
tF
VCC Slew Rate
(VCCTP (MIN) to VCCTP (MAX))
tR
VCC Detect to RESET
t RPU
2
Note 1
t R = 5µs
300
µs
0
ns
100
150
250
ms
Notes 1. The tF value is for reference in defining values for tRPD and should not be considered a requirement for proper operation or use.
© 1999 IMP, Inc.
408-432-9100/www.impweb.com
3
IMP18 1 5
Application Information
Operation – Power Monitor
Output Conditions
The IMP1815 detects out-of-tolerance power supply conditions. It
resets a processor during power-up, power-down and issues a
reset to the system processor when the monitored power supply
voltage is below the reset threshold. When an out-of-tolerance VCC
voltage is detected, the RESET signal is asserted. On power-up,
RESET is kept active (LOW) for approximately 150ms after the
power supply voltage has reached the selected tolerance. This
allows the power supply and microprocessor to stabilize before
RESET is released.
The IMP1815 active LOW reset signal is valid as long as VCC
remains above 1.2V. The RESET output on the IMP1815 uses a
push-pull drive stage that can maintain a valid output below 1.2V.
To sink current with VCC below 1.2V, a resistor can be connected
from the reset pin (RESET) to Ground (see Figure 1). This
configuration will give a valid value on the RESET output with
VCC approaching 0V. During both power up and down, this configuration will draw current when RESET is in the high state. A
value of 100kΩ should be adequate to maintain a valid condition.
tR
VCCTP (MIN)
VCCTP (MAX)
VCCTP
IMP1815
Microprocessor
RESET
VCC
tRPU
RESET
VOH
100k
RESET
1815_07.eps
1815_06.eps
Figure 2. Timing Diagram: Power-Up
Figure 1. RESET Valid to 0V VCC
tF
VCC
VCCTP (MAX)
VCCTP
VCCTP (MIN)
tRPD
RESET
VOL
1815_08.eps
Figure 3. Timing Diagram: Power-Down
4
408-432-9100/www.impweb.com
© 1999 IMP, Inc.
IMP18 16
POWER MANAGEMENT
Low Power, 3.3V/3.0V µP Reset
– Active LOW, Open-Drain Output
The IMP1816 supply voltage monitor is an improved, low-power
replacement for the Dallas Semiconductor DS1816. Maximum supply
current over temperature is a low 15µA, representing over 50 percent
lower power as compared to the DS1816.
The IMP1816 issues an active LOW reset signal whenever the monitored
supply is out-of-tolerance. A precision reference and comparator circuit
monitor power supply (VCC) level. Tolerance level options are 5-, 10- and
20-percent. When an out-of-tolerance condition is detected, an internal
power-fail signal is generated which forces an active LOW reset signal.
After VCC returns to an in-tolerance condition, the reset signal remains
active for 150ms to allow the power supply and system microprocessor
to stabilize.
The IMP1816 is designed with a open-drain 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 IMP1810/11/12/15/17,
IMP1233D and IMP1233M.
Key Features
◆ Improved Dallas DS1816 replacement
— Over 70% lower maximum supply current
◆ Low Supply Current
— 20µA maximum (5.5V)
— 15µA maximum (3.6V)
◆ Automatically restarts a microprocessor after
power failure
◆ 150ms reset delay after VCC returns to an
in-tolerance condition
◆ Active LOW power-up reset
◆ Precision temperature-compensated voltage
reference and comparator
◆ Eliminates external components
◆ Low-cost TO-92 package
◆ Compact surface mount SOT-23 package
◆ Operating temperature – 40°C to +85°C
Family Selection Guide
Applications
RESET Voltage RESET Time
(V)
(ms)
Part
IMP1810
IMP1811
IMP1812
IMP1815
IMP1816
IMP1817
IMP1233D
IMP1233M
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
Output
Stage
RESET
Polarity
Push-Pull
Open-Drain
Push-Pull
Push-Pull
Open-Drain
Push-Pull
Open-Drain
Open-Drain
LOW
LOW
HIGH
LOW
LOW
HIGH
LOW
LOW
◆
◆
◆
◆
◆
◆
◆
Set-top boxes
Cellular phones
PDAs
Energy management systems
Embedded control systems
Printers
Single board computers
Block Diagram
Typical Application
VCC
1
VCC
Supply
Tolerance
Bias
IMP1816
5.5kΩ
2
+
–
IMP1816
RESET
Delay
150ms Typical
Microprocessor
RESET
RESET
GND
Reference
3
GND
© 1999 IMP, Inc.
1816_02.eps
1816_01.eps
408-432-9100/www.impweb.com
1
IMP18 16
Pin Configuration
SOT23
RESET
TO-92*
1
IMP1816-X
IMP1816-X
3
VCC
GND
2
1
1816_03.eps
2
3
1816_04.eps
Pin Descriptions
Pin Number
Name
Function
1
RESET
Active LOW reset output
2
VCC
Power supply input
3
GND
Ground
Package Marking Code
3
SOT-23 Package Letter Code
A
B
Part
Reset Tolerance
K
K
K
A
B
D
IMP1816
IMP1816
IMP1816
5%
10%
20%
A
B
C
1
D
2
1816_05a.eps
1816_t02.eps
Ordering Information
Device Summary
RESET
ESET RESET
Part*** Output TR
o
l
erance Time
Number Voltage
(%)
(ms)
(V)
Package Marking
Open-Drain** TO-92* SOT-23 RESET
Output
Package Package Polarity
Stage
B
C
D
IMP1816-5
3.06
5
150
l
l
LOW
IMP1816-10
2.88
10
150
l
l
LOW
IMP1816-20
2.55
20
150
l
l
LOW
IMP1816R-5
3.06
5
150
l
l
LOW
K
A
X
X
IMP1816R-10
2.88
10
150
l
l
LOW
K
B
X
X
IMP1816R-20
2.55
20
150
l
l
LOW
K
D
X
X
* Add /S to Part Number for straight (unformed) leads. (ie. IMP18xx-x/S)
** Internal 5.5kΩ resistor pull up.
*** Add /T to Part Number for Tape and Reel. (ie. IMP18xx-x/T)
2
A
408-432-9100/www.impweb.com
XX = Date code
© 1999 IMP, Inc.
IMP18 16
Absolute Maximum Ratings
Voltage on VCC . . . . . . . . . . . . . . . . . . . . . . . . –0.5V to 7V
Voltage on RESET . . . . . . . . . . . . . . . . . . . . . –0.5V to VCC + 0.5V
Operating Temperature Range . . . . . . . . . . . –40°C to 85°C
Soldering Temperature . . . . . . . . . . . . . . . . . . 260°C for 10 seconds
Storage Temperature . . . . . . . . . . . . . . . . . . . –55°C to 125°C
Voltages measured with respect to ground.
These are stress ratings only and functional operation is not implied.
Electrical Characteristics
Unless otherwise noted, VCC = 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
Symbol
Conditions
Min
Typ
1.2
Max
Units
5.5
V
Supply Voltage
VCC
Output Voltage
VOH
IOUT < 500µA
Output Current
IOL
Output = 0.4V, VCC ≥ 2.7V
Operating Current
ICC
VCC < 5.5V, RESET output open
8
20
µA
Operating Current
ICC
VCC ≤ 3.6V, RESET output open
6
15
µA
VCC – 0.5V
VCC – 0.1V
V
+10
mA
VCC Trip Point (IMP1816-5)
VCCTP
2.98
3.06
3.15
V
VCC Trip Point (IMP1816-10)
VCCTP
2.80
2.88
2.97
V
VCC Trip Point (IMP1816-20)
VCCTP
2.47
2.55
2.64
V
RP
3.5
5.5
7.5
kΩ
10
pF
5
µs
Internal Pull-Up Resistor
Output Capacitance
C OUT
VCC Detect to RESET Low
t RPD
VCC Slew Rate
(VCCTP (MAX) to VCCTP (MIN))
tF
VCC Slew Rate
(VCCTP (MIN) to VCCTP (MAX))
tR
VCC Detect to RESET High
t RPU
2
Note 1
t R = 5µs
300
µs
0
ns
100
150
250
ms
Notes 1. The tF value is for reference in defining values for tRPD and should not be considered a requirement for proper operation or use.
© 1999 IMP, Inc.
408-432-9100/www.impweb.com
3
IMP18 16
Application Information
Operation – Power Monitor
The IMP1816 detects out-of-tolerance power supply conditions. It
resets a processor during power-up, power-down and issues a
reset to the system processor when the monitored power supply
voltage is below the reset threshold. When an out-of-tolerance VCC
voltage is detected, the RESET signal is asserted. On power-up,
RESET is kept active (LOW) for approximately 150ms after the
power supply voltage has reached the selected tolerance. This
allows the power supply and microprocessor to stabilize before
RESET is released.
tF
VCC
VCCTP (MAX)
VCCTP
VCCTP (MIN)
tRPD
RESET
tR
VCCTP (MIN)
VCCTP (MAX)
VCCTP
VOL
1816_07.eps
VCC
Figure 2. Timing Diagram: Power-Down
tRPU
VOH
RESET
1816_06.eps
Figure 1. Timing Diagram: Power-Up
4
408-432-9100/www.impweb.com
© 1999 IMP, Inc.
IMP18 17
POWER MANAGEMENT
Low Power, 3.3V/3.0V µP Reset
– Active HIGH, Push-Pull Output
The IMP1817 supply voltage monitor is an improved, low-power
replacement for the Dallas Semiconductor DS1817. Maximum supply
current over temperature is a low 15µA, representing over 50 percent
lower power as compared to the DS1817.
The IMP1817 issues an active HIGH reset signal whenever the monitored supply is out-of-tolerance. A precision reference and comparator
circuit monitor power supply (VCC) level. Tolerance level options are 5-,
10- and 20-percent. When an out-of-tolerance condition is detected, an
internal power-fail signal is generated which forces an active HIGH reset
signal. After VCC returns to an in-tolerance condition, the reset signal
remains active for 150ms to allow the power supply and system microprocessor to stabilize.
The IMP1817 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 IMP1810/11/12/15/16,
IMP1233D and IMP1233M.
Key Features
◆ Improved Dallas DS1817 replacement
— Over 50% lower maximum supply current
◆ Low Supply Current
— 20µA maximum (5.5V)
— 15µA maximum (3.6V)
◆ Automatically restarts a microprocessor after
power failure
◆ 150ms reset delay after VCC returns to an
in-tolerance condition
◆ Active HIGH power-up reset
◆ Precision temperature-compensated voltage
reference and comparator
◆ Eliminates external components
◆ Low-cost TO-92 package
◆ Compact surface mount SOT-23 package
◆ Push-Pull output for minimum current drain
◆ Operating temperature – 40°C to +85°C
Family Selection Guide
RESET Voltage RESET Time
(V)
(ms)
Part
IMP1810
IMP1811
IMP1812
IMP1815
IMP1816
IMP1817
IMP1233D
IMP1233M
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
Output
Stage
RESET
Polarity
Push-Pull
Open-Drain
Push-Pull
Push-Pull
Open-Drain
Push-Pull
Open-Drain
Open-Drain
LOW
LOW
HIGH
LOW
LOW
HIGH
LOW
LOW
Applications
◆
◆
◆
◆
◆
◆
◆
Set-top boxes
Cellular phones
PDAs
Energy management systems
Embedded control systems
Printers
Single board computers
Block Diagram
Typical Application
VCC
1
VCC
Supply
Tolerance
Bias
IMP1817
IMP1817
+
–
Microprocessor
Delay
150ms
Typical
2
RESET
RESET
RESET
GND
Reference
3
GND
© 1999 IMP, Inc.
1817_02.eps
1817_01.eps
408-432-9100/www.impweb.com
1
IMP18 17
Pin Configuration
SOT23
RESET
TO-92*
1
IMP1817-X
IMP1817-X
3
VCC
GND
2
1
1817_03.eps
2
3
1817_04.eps
Pin Descriptions
Pin Number
Name
Function
1
RESET
Active LOW reset output
2
VCC
Power supply input
3
GND
Ground
Package Marking Code
3
SOT-23 Package Letter Code
A
B
Part
Reset Tolerance
M
M
M
A
B
C
IMP1817
IMP1817
IMP1817
5%
10%
20%
A
B
C
1
D
2
1817_05a.eps
1817_t02.eps
Ordering Information
Device Summary
Part**
Number
Package Marking
RESET RESET RESET Push-Pull
Output
-92* SOT-23
rance Time
Output PTaOck
Voltage Tole(%
age Package
)
(ms)
Stage
(V)
A
B
C
D
IMP1817-5
3.06
5
150
l
l
LOW
IMP1817-10
2.88
10
150
l
l
LOW
IMP1817-20
2.55
20
150
l
l
LOW
IMP1817R-5
3.06
5
150
l
l
LOW
M
A
X
X
IMP1817R-10
2.88
10
150
l
l
LOW
M
B
X
X
l
LOW
M
C
X
X
2.55
20
150
l
* 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)
IMP1817R-20
2
RESET
Polarity
408-432-9100/www.impweb.com
XX = Date code
© 1999 IMP, Inc.
IMP1 8 17
Absolute Maximum Ratings
Voltage on VCC . . . . . . . . . . . . . . . . . . . . . . . . –0.5V to 7V
Voltage on RESET . . . . . . . . . . . . . . . . . . . . . –0.5V to VCC + 0.5V
Operating Temperature Range . . . . . . . . . . . –40°C to 85°C
Soldering Temperature . . . . . . . . . . . . . . . . . . 260°C for 10 seconds
Storage Temperature . . . . . . . . . . . . . . . . . . . –55°C to 125°C
Voltages measured with respect to ground.
These are stress ratings only and functional operation is not implied.
Electrical Characteristics
Unless otherwise noted, VCC = 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
Symbol
Conditions
Supply Voltage
VCC
Output Voltage
VOH
IOUT < 500µA
Output Current
IOH
Output = 2.4V, VCC ≥ 2.7V
Output Current
IOL
Output = 0.4V, VCC ≥ 2.7V
Operating Current
ICC
VCC < 5.5V, RESET output open
ICC
VCC ≤ 3.6V, RESET output open
Min
Typ
1.2
VCC – 0.5V
Max
Units
5.5
V
VCC – 0.1V
V
350
µA
+10
mA
8
20
µA
6
15
µA
VCC Trip Point (IMP1817-5)
VCCTP
2.98
3.06
3.15
V
VCC Trip Point (IMP1817-10)
VCCTP
2.80
2.88
2.97
V
VCC Trip Point (IMP1817-20)
VCCTP
2.47
2.55
2.64
V
Output Capacitance
C OUT
10
pF
VCC Detect to RESET Low
t RPD
5
µs
Operating Current
VCC Slew Rate
(VCCTP (MAX) to VCCTP (MIN))
tF
VCC Slew Rate
(VCCTP (MIN) to VCCTP (MAX))
tR
VCC Detect to RESET High
t RPU
2
Note 1
t R = 5µs
300
µs
0
ns
100
150
250
ms
Notes 1. The tF value is for reference in defining values for tRPD and should not be considered a requirement for proper operation or use.
© 1999 IMP, Inc.
408-432-9100/www.impweb.com
3
IMP18 17
Application Information
Operation – Power Monitor
The IMP1817 detects out-of-tolerance power supply conditions. It
resets a processor during power-up, power-down and issues a
reset to the system processor when the monitored power supply
voltage is below the reset threshold. When an out-of-tolerance VCC
voltage is detected, the RESET signal is asserted. On power-up,
RESET is kept active (HIGH) for approximately 150ms after the
power supply voltage has reached the selected tolerance. This
allows the power supply and microprocessor to stabilize before
RESET is released.
tR
VCCTP (MIN)
VCCTP (MAX)
VCCTP
IMP1817
Microprocessor
RESET
VIN
tRPU
RESET
VOL
RESET
1817_07.eps
1815_07.eps
Figure 2. Timing Diagram: Power-Up
Figure 1. RESET Valid to 0V VCC
tF
VCC
VCCTP (MAX)
VCCTP
VCCTP (MIN)
tRPD
VOH
RESET Slews with VCC
RESET
1817_08.eps
Figure 3. Timing Diagram: Power-Down
4
408-432-9100/www.impweb.com
© 1999 IMP, Inc.
IMP1 233D
POWER MANAGEMENT
Key Features
Low Power, 5V µP Reset
– Active LOW, Open-Drain Output
– 350ms Reset Period
The IMP1233D supply voltage monitor is an improved, low-power
replacement for the Dallas Semiconductor DS1233D. Maximum supply
current over temperature is a low 20µA, representing over 60 percent
lower power as compared to the DS1233D.
The IMP1233D issues an active LOW reset signal whenever the monitored supply is out-of-tolerance. A precision reference and comparator
circuit monitor power supply (VCC) 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 VCC returns to an in-tolerance condition, the reset signal
remains active for 350ms to allow the power supply and system microprocessor to stabilize.
The IMP1233D is designed with a open-drain output stage and operates
over the extended industrial temperature range. Devices are available in
compact surface mount SOT-223 packages and 3-lead TO-92 packages.
Other low power products in this family include the IMP1810/11/12/15/
16/17 and IMP1233M.
◆ Improved Dallas DS1233D replacement
— Over 60% lower maximum supply current
◆ Low Supply Current
— 20µA maximum (5.5V)
— 15µA maximum (3.6V)
◆ Automatically restarts a microprocessor after
power failure
◆ 350ms reset delay after VCC returns to an
in-tolerance condition
◆ Active LOW power-up reset, 5kΩ internal pull-up
◆ Precision temperature-compensated voltage
reference and comparator
◆ Eliminates external components
◆ Motorola 68xxx and HC16 compatible
◆ Low-cost TO-92 package
◆ Compact surface mount SOT-223 package
◆ Operating temperature – 40°C to +85°C
Family Selection Guide
Part
IMP1810
IMP1811
IMP1812
IMP1815
IMP1816
IMP1817
IMP1233D
IMP1233M
Applications
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
Output
Stage
RESET
Polarity
Push-Pull
Open-Drain
Push-Pull
Push-Pull
Open-Drain
Push-Pull
Open-Drain
Open-Drain
LOW
LOW
HIGH
LOW
LOW
HIGH
LOW
LOW
◆
◆
◆
◆
◆
◆
◆
Set-top boxes
Cellular phones
PDAs
Energy management systems
Embedded control systems
Printers
Single board computers
Block Diagram
Typical Application
VCC
VCC
Supply
Tolerance
Bias
IMP1233D
5.0kΩ
IMP1233D
RESET
+
–
Delay
350ms Typical
RESET
RESET
GND
Reference
GND
© 1999 IMP, Inc.
Microprocessor
1233D_02.eps
1233D_01.eps
408-432-9100/www.impweb.com
1
IMP1 233D
Pin Configuration
SOT-223
RESET
2
GND
4
VCC
3
TO-92*
IMP1233D-X
IMP1233D-X
1
GND
1
1233D_03.eps
2
3
Pin Descriptions
Pin Numbers
SOT-223
TO-92
1
2
3
4
1
2
3
—
1233D_04.eps
Name
Function
GND
RESET
VCC
GND
Ground
Active LOW reset output
Power supply input
Ground (SOT-223 Only)
Package Marking Code
1
Package
Letter Code
A
B
C
3
3
D
Part
Type
Package
Letter Code
D
IMP1233D
A
B
C
Reset
Tolerance
A
5%
10%
15%
2
B
D
C
4
3
1233D_05a.eps
Ordering Information
Device Summary
Part
Number
RESET
Output
Voltage
(V)
Package Marking
Output Stage
D
RESET RESET
TO-92* SOT-223** RESET
***
Tolerance Time Open-Drain Push-Pull Package Package Polarity A
(%)
(ms)
IMP1233D-5
4.625
5
350
X
X
LOW
IMP1233D-10
4.375
10
350
X
X
LOW
IMP1233D-15
4.125
15
350
X
X
LOW
IMP1233DZ-5
4.625
5
350
X
X
LOW
3
B
A = 5%
C B = 10%
C = 15%
3
D
A
IMP1233DZ-10
4.375
10
350
X
X
LOW
3
3
D
B
IMP1233DZ-15
4.125
15
350
X
X
LOW
3
3
D
C
* 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)
*** Internal 5kΩ resistor pull up.
2
408-432-9100/www.impweb.com
1233D_t03.eps
© 1999 IMP, Inc.
IMP1 233D
Absolute Maximum Ratings
Voltage on VCC . . . . . . . . . . . . . . . . . . . . . . . . –0.5V to 7V
Voltage on RESET . . . . . . . . . . . . . . . . . . . . . –0.5V to VCC + 0.5V
Operating Temperature Range . . . . . . . . . . . –40°C to 85°C
Soldering Temperature . . . . . . . . . . . . . . . . . . 260°C for 10 seconds
Storage Temperature . . . . . . . . . . . . . . . . . . . –55°C to 125°C
Voltages measured with respect to ground.
These are stress ratings only and functional operation is not implied.
Electrical Characteristics
Unless otherwise noted, VCC = 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
Symbol
Conditions
Min
Typ
1.2
Max
Units
5.5
V
Supply Voltage
VCC
Output Voltage
VOH
IOUT < 500µA
Output Current
IOL
Output = 0.4V, VCC ≥ 2.7V
Operating Current
ICC
VCC < 5.5V, RESET output open
8
20
µA
Operating Current
ICC
VCC ≤ 3.6V, RESET output open
6
15
µA
VCC – 0.5V
VCC – 0.1V
V
+8
mA
VCC Trip Point (IMP1233D-5)
VCCTP
4.50
4.625
4.74
V
VCC Trip Point (IMP1233D-10)
VCCTP
4.25
4.375
4.49
V
VCC Trip Point (IMP1233D-15)
VCCTP
4.00
4.125
4.24
V
RP
3.5
5.0
7.5
kΩ
10
pF
250
350
450
ms
2
5
µs
Internal Pull-Up Resistor
Output Capacitance
C OUT
RESET Active Time
t RESET
VCC Detect to RESET Low
t RPD
VCC Slew Rate
(VHTL - VLTL)
tF
300
µs
VCC Slew Rate
(VLTL - VHTL)
tR
0
ns
VCC Detect to RESET High
© 1999 IMP, Inc.
t RPU
t R = 5µs
408-432-9100/www.impweb.com
250
350
450
ms
3
IMP1 233D
Application Information
Operation – Power Monitor
The IMP1233D detects out-of-tolerance power supply conditions.
It resets a processor during power-up and issues a reset to the system processor when the monitored power supply voltage is below
the reset threshold (power-down). When an out-of-tolerance VCC
voltage is detected, the RESET signal is asserted. On power-up,
RESET is kept active (LOW) for approximately 350ms after the
power supply voltage has reached the selected tolerance. This
allows the power supply and microprocessor to stabilize before
RESET is released.
tR
VCCTP (MAX)
VCCTP
VCCTP (MIN)
VCC
tRPU
VOH
RESET
1233D_06.eps
Figure 1. Timing Diagram: Power-Up
tF
VCC
VCCTP (MAX)
VCCTP
VCCTP (MIN)
tRPD
RESET
VOL
1233D_07.eps
Figure 2. Timing Diagram: Power-Down
4
408-432-9100/www.impweb.com
© 1999 IMP, Inc.
IMP1 233M
POWER MANAGEMENT
Key Features
Low Power, 5V/3.0V µP Reset
– Active LOW, Open-Drain Output
– 350ms Reset Period
The IMP1233M supply voltage monitor is an improved, low-power
replacement for the Dallas Semiconductor DS1233M. Maximum supply
current over temperature is a low 20µA, representing 60 percent lower
power as compared to the DS1233M.
The IMP1233M issues an active LOW reset signal whenever the monitored supply is out-of-tolerance. A precision reference and comparator
circuit monitor power supply (VCC) level. Tolerance level options are
5- and 10-percent for a 5V power supply. The tolerance is 15-percent for
the 3.3V, IMP1233M. When an out-of-tolerance condition is detected, an
internal power-fail signal is generated which forces an active LOW reset
signal. After VCC returns to an in-tolerance condition, the reset signal
remains active for 350ms to allow the power supply and system microprocessor to stabilize.
The IMP1233M is designed with a open-drain output stage and operates
over the extended industrial temperature range. Devices are available in
the compact surface mount SO-8 package and a 3-lead TO-92 package.
Other low power products in this family include the IMP1810/11/12/15/
16/17 and IMP1233D.
Family Selection Guide
RESET Voltage RESET Time
(V)
(ms)
Part
IMP1810
IMP1811
IMP1812
IMP1815
IMP1816
IMP1817
IMP1233D
IMP1233M
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
Output
Stage
RESET
Polarity
Push-Pull
Open-Drain
Push-Pull
Push-Pull
Open-Drain
Push-Pull
Open-Drain
Open-Drain
LOW
LOW
HIGH
LOW
LOW
HIGH
LOW
LOW
◆ Improved Dallas DS1233M replacement
— 60% lower maximum supply current
◆ Low Supply Current
— 20µA maximum (5.5V)
— 15µA maximum (3.6V)
◆ Automatically restarts a microprocessor after
power failure
◆ 350ms reset delay after VCC returns to an
in-tolerance condition
◆ Active LOW power-up reset, 5kΩ internal pull-up
◆ Precision temperature-compensated voltage
reference and comparator
◆ Eliminates external components
◆ Pin function compatible with the Motorola
MC33064, MC34064, MC33164 and MC34164
◆ Motorola 68xxx and HC16 compatible
◆ Low-cost TO-92 package
◆ Compact surface mount SO-8 package
◆ Operating temperature – 40°C to +85°C
Applications
◆
◆
◆
◆
◆
◆
◆
Set-top boxes
Cellular phones
PDAs
Energy management systems
Embedded control systems
Printers
Single board computers
Block Diagram
Typical Application
VCC
VCC
Supply
Tolerance
Bias
IMP1233M
5.0kΩ
IMP1233M
RESET
+
–
Delay
350ms Typical
RESET
RESET
GND
Reference
GND
© 1999 IMP, Inc.
Microprocessor
1233M_02.eps
1233M_01.eps
408-432-9100/www.impweb.com
1
IMP1 233M
Pin Configuration
SO-8
TO-92*
RESET
1
8
NC
VCC
2
7
NC
NC
3
6
NC
GND
4
5
NC
IMP1233M
IMP1233M-X
1233M_03.eps
1
2
3
1233M_04.eps
Pin Descriptions
Pin Numbers
SO-8
TO-92
1
2
3, 5, 6, 7 and 8
4
1
2
—
3
Name
Function
RESET
VCC
NC
GND
Active LOW reset output
Power supply input
No connection
Ground
Ordering Information
Device Summary
Part Number
IMP1233M-55
RESET
Output
Voltage
(V)
4.625
Output Stage
RESET RESET
TO-92*
Tolerance Time
P
ackage
(%)
(ms)
Open-Drain** Push-Pull
5
350
X
SO-8
Package
X
RESET
Polarity
LOW
IMP1233M-5
4.375
10
350
X
X
LOW
IMP1233M-3
2.720
15
350
X
X
LOW
IMP1233MS-55
4.625
5
350
X
X
LOW
IMP1233MS-5
4.375
10
350
X
X
LOW
IMP1233MS-3
2.720
15
350
X
X
LOW
* Add /S to Part Number for straight (unformed) leads. (ie. IMP18xx-x/S)
** Internal 5kΩ resistor pull up.
2
408-432-9100/www.impweb.com
1233M03
© 1999 IMP, Inc.
IMP1 233M
Absolute Maximum Ratings
Voltage on VCC . . . . . . . . . . . . . . . . . . . . . . . . –0.5V to 6.5V
Voltage on RESET . . . . . . . . . . . . . . . . . . . . . –0.5V to VCC + 0.5V
Operating Temperature Range . . . . . . . . . . . –40°C to 85°C
Soldering Temperature . . . . . . . . . . . . . . . . . . 260°C for 10 seconds
Storage Temperature . . . . . . . . . . . . . . . . . . . –55°C to 125°C
Voltages measured with respect to ground.
These are stress ratings only and functional operation is not implied.
Electrical Characteristics
Unless otherwise noted, VCC = 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
Symbol
Supply Voltage
VCC
Conditions
Min
Typ
Output Voltage
VOH
IOUT < 500µA
Output Current
IOL
Output = 0.4V, VCC ≥ 2.7V
Operating Current
ICC
VCC < 5.5V, RESET output open
8
20
µA
Operating Current
ICC
VCC ≤ 3.6V, RESET output open
6
15
µA
1.2
VCC – 0.5V
Max
Units
5.5
V
VCC – 0.1V
V
+8
mA
VCC Trip Point (IMP1233M-5)
VCCTP
4.25
4.375
4.49
V
VCC Trip Point (IMP1233M-55)
VCCTP
4.5
4.625
4.75
V
VCC Trip Point (IMP1233M-3)
VCCTP
2.64
2.72
2.8
V
Voltage High Trip Level
IMP1233M-5
IMP1233M-55
VHTL
4.75
V
Voltage Low Trip Level
IMP1233M-5
IMP1233M-55
VLTL
4.00
V
Voltage High Trip Level
IMP1233M-3
VHTL
3.14
V
Voltage Low Trip Level
IMP1233M-3
VLTL
2.48
V
Internal Pull-Up Resistor
RP
7.5
kΩ
10
pF
10
µs
Output Capacitance
C OUT
VCC Detect to RESET Low
t RPD
3.5
5.0
2
VCC Slew Rate
(VHTL - VLTL)
tF
300
µs
VCC Slew Rate
(VLTL - VHTL)
tR
0
ns
VCC Detect to RESET High
t RPU
t R = 5µs
200
350
500
ms
Notes: 1. A 1kΩ external resistor maybe required in some applications for proper operation of the microprocessor reset control circuit.
© 1999 IMP, Inc.
408-432-9100/www.impweb.com
3
IMP1 233M
Application Information
Operation – Power Monitor
The IMP1233M detects out-of-tolerance power supply conditions.
It resets a processor during power-up and issues a reset to the
system processor when the monitored power supply voltage
is below the reset threshold (power-down). When an out-oftolerance VCC voltage is detected, the RESET signal is asserted. On
power-up, RESET is kept active (LOW) for approximately 350ms
after the power supply voltage has reached the selected tolerance.
This allows the power supply and microprocessor to stabilize
before RESET is released.
tR
VHTL
VCCTP
VLTL
VCC
tRPU
VOH
RESET
1233M_05.eps
Figure 1. Timing Diagram: Power-Up
tF
VCC
VHTL
VCCTP
VLTL
tRPD
RESET
VOL
1233M_06.eps
Figure 2. Timing Diagram: Power-Down
4
408-432-9100/www.impweb.com
© 1999 IMP, Inc.
P ac k ag e Inf or mation
Package Dimensions
Plastic SOT-23 (3-Pin)
Inches
B
Millimeters
Min
E
D
a
A
A1
e1
Min
Max
Plastic SOT-23 (3-Pin)
H
e
S
Max
C
L
SOT-23 (3-Pin).eps
Plastic SOT-223 (4-Pin)
B
A
A1
B
C
D
E
e
e1
H
L
S
0.031
0.050
0.004
0.010
0.015
0.020
0.003
0.007
0.110
0.120
0.047
0.055
0.035
0.040
0.070
0.080
0.083
0.1039
0.027 REF
0.018
0.024
A
A1
B
B1
C
D
e
e1
E
h
S
t
Q
Q1
Q2
0.067
0.060
0.004
0.0008
0.124
0.116
0.033
0.026
0.014
0.010
0.264
0.248
0.0905 NOM
0.181 NOM
0.146
0.130
0.287
0.264
0.041
0.033
0.051
0.043
10° MAX
16°
10°
16°
10°
A
A1
B
C
e
E
H
L
D
0.053
0.004
0.013
0.007
0.80
1.27
0.10
0.25
0.37
0.51
0.085
0.18
2.80
3.04
1.20
1.40
0.89
1.03
1.78
2.05
2.10
2.64
0.069 REF
0.45
0.60
Plastic SOT-223** (4-Pin)
E
H
e
S
Q1
D
Q
A
B1
A1
Q2
e1
C
SOT-223 (4-Pin).eps
Plastic SO-8 (8-Pin)
0°– 8°
L
E
C
A
e
A1
SO (8-Pin).eps
TO-92 (3-Pin)
B
L
M
Section
A-A
C
D
J
Section
A-A
F
K
E
G
1
H
© 1999 IMP, Inc.
2
3
I
2.30 NOM
4.50 NOM
3.70
7.30
1.05
1.30
3.30
6.70
0.85
1.10
10° MAX
16°
16°
10°
10°
0.069
0.010
0.020
0.010
1.35
0.10
0.33
0.19
0.157
0.244
0.050
0.197
3.80
5.80
0.40
4.80
0.050
0.150
0.228
0.016
0.189
1.75
0.25
0.51
0.25
1.27
4.00
6.20
1.27
2.00
TO-92* (3-Pin)
A
D
1.50
0.02
2.95
0.65
0.25
6.30
Plastic SO-8 (8-Pin)
H
D
B
1.70
0.10
3.15
0.85
0.35
6.70
Bottom View
TO-92.eps
A
0.175
0.195
4.45
4.95
B
0.170
0.192
4.32
4.96
C
0.500
0.610
12.70
15.49
D
0.016
0.022
0.406
0.559
E
0.095
0.105
2.41
2.67
F
0.045
0.60
1.14
1.52
G
0.45
0.060
1.14
1.52
H
0.085
0.095
2.16
2.41
I
0.130
0.155
3.30
3.94
J
0.014
0.020
0.35
0.51
K
0.093
0.115
2.36
2.92
L
45°
60°
45°
60°
M
0.118 Typical
3.00
* Formed leads are standard. Add /S to Part Number for straight leads.
** Add /T to Part Number for Tape and Reel.
18xx_t01.eps
408-432-9100/www.impweb.com
IMP, Inc.
Corporate Headquarters
2830 N. First Street
San Jose, CA 95134-2071
Tel: 408-432-9100
Tel: 800-438-3722
Fax: 408-434-0335
Fax-on-Demand: 1-800-249-1614 (USA)
Fax-on-Demand: 1-303-575-6156 (International)
e-mail: [email protected]
http://www.impweb.com
The IMP logo is a registered trademark of IMP, Inc.
All other company and product names are trademarks of their respective owners.
© 1999 IMP, Inc.
Printed in USA
Publication #: 1002
Revision:
A
Issue Date:
06/15/99
Type:
Preliminary
Similar pages