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POWER MANAGEMENT Supervisors
IMP1810 -- Lo w Po w er, 5V P R eset
Active LOW, Push-Pull Output
IMP1811 -- Lo w Po w er, 5V P R eset
Active LOW, Open-Drain Output
IMP181 2 -- Lo w Po w er, 5V P R eset
Active HIGH, Push-Pull Output
IMP1815 -- Lo w Po w er, 3.3V/3.0V P R eset
Active LOW, Push-Pull Output
IMP1816 -- Lo w Po w er, 3.3V/3.0V P R eset
Active LOW, Open-Drain Output
IMP1817 -- Lo w Po w er, 3.3V/3.0V P R eset
Active HIGH, Push-Pull Output
IMP1 233D -- Lo w Po w er, 5V P R eset
Active LOW, Open-Drain Output
IMP1 233M -- Lo w Po w er, 5V/3.0V 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.
P Super visor Cr oss R ef er ence
P 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
(c) 1999 IMP, Inc.
IMP18 1 0
POWER MANAGEMENT
Low Power, 5V P Reset
Key Features
x Improved Dallas DS1810 replacement -- 50% lower maximum supply current x Low Supply Current -- 20A maximum (5.5V) x Automatically restarts a microprocessor after power failure x 150ms reset delay after VCC 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 - 40C to +85C
- 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 20A, 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.
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
VCC 1 VCC Supply Tolerance Bias
Typical Application
IMP1810 IMP1810
+ -
Delay 150ms Typical Microprocessor 2 RESET RESET RESET
Reference 3 GND
(c) 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
VCC
2 1
1810_03.eps
2
3
1810_04.eps
Pin Descriptions
Pin Number
1 2 3
Name
RESET VCC 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 TO-92* SO -23 r ime Output Package PacTage Voltage Tole%ance Tms) k () ( 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
(c) 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 . . . . . . . . . . . -40C to 85C Voltages measured with respect to ground. These are stress ratings only and functional operation is not implied. Soldering Temperature . . . . . . . . . . . . . . . . . . 260C for 10 seconds Storage Temperature . . . . . . . . . . . . . . . . . . . -55C to 125C
Electrical Characteristics
Unless otherwise noted, VCC = 1.2V to 5.5V and specifications are over the operating temperature range of - 40C to +85C. All voltages are referenced to ground.
Parameter
Supply Voltage Output Voltage Output Current Output Current Operating Current VCC Trip Point (IMP1810-5) VCC Trip Point (IMP1810-10) VCC Trip Point (IMP1810-15) Output Capacitance VCC Detect to RESET Low VCC Slew Rate (VCCTP (MAX) to VCCTP (MIN)) VCC Slew Rate (VCCTP (MIN) to VCCTP (MAX)) VCC Detect to RESET High
Symbol
VCC VOH IOH IOL ICC VCCTP VCCTP VCCTP C OUT t RPD tF tR t RPU
Conditions
IOUT < 500A Output = 2.4V, VCC 2.7V Output = 0.4V, VCC 2.7V VCC < 5.5V, RESET output open
Min
1.2 VCC - 0.5V +10
Typ
VCC - 0.1V 350 8
Max
5.5
Units
V V A mA
20 4.75 4.49 4.24 10 5
A V V V pF s s ns
4.50 4.25 4.00
4.62 4.37 4.12 2
300 0 t r = 5s 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.
(c) 1999 IMP, Inc.
408-432-9100/www.impweb.com
3
IMP18 1 0
Application Information
Operation - Power Monitor
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.
Output Conditions
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 100k should be adequate to maintain a valid condition.
tR VCCTP (MAX) VCCTP
VCCTP (MIN)
IMP1810
Microprocessor RESET 100k RESET
1810_06.eps 1810_07.eps
VCC tRPU VOH
RESET
Figure 1. RESET Valid to 0V VCC
Figure 2. Timing Diagram: Power-Up
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
(c) 1999 IMP, Inc.
IMP18 1 1
POWER MANAGEMENT
Low Power, 5V P Reset
Key Features
x Improved Dallas DS1811 replacement -- 50% lower maximum supply current x Low Supply Current -- 20A maximum (5.5V) x Automatically restarts a microprocessor after power failure x 150ms reset delay after VCC 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 Operating temperature - 40C to +85C
- 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 20A, 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.
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
VCC 1 VCC Supply Tolerance Bias
Typical Application
IMP1811
+ -
Delay 150ms Typical
5.5k 2
IMP1811
RESET RESET Microprocessor RESET
Reference 3 GND
(c) 1999 IMP, Inc.
GND
1811_02.eps 1811_01.eps
408-432-9100/www.impweb.com
1
IMP18 1 1
Pin Configuration
SOT23
RESET 1 IMP1811-X 3 GND
TO-92*
IMP1811-X
VCC
2
1811_03.eps
1
2
3
1811_04.eps
Pin Descriptions
Pin Number
1 2 3
Name
RESET VCC GND
Function
Active LOW reset output Power supply input Ground
Package Marking Code
SOT-23 Package Letter Code A
C C C
3
B
A B C
Part
IMP1811 IMP1811 IMP1811
Reset Tolerance
5% 10% 15%
1811_t02.eps
A
1
B
C
D
2
1811_05a.eps
Ordering Information
Device Summary RESET SET Part*** Output TRlErance RESET oe Time Number Voltage (%) (ms) (V)
IMP1811-5 IMP1811-10 IMP1811-15 IMP1811R-5 IMP1811R-10 IMP1811R-15 4.62 4.35 4.13 4.62 4.35 4.13 5 10 15 5 10 15 150 150 150 150 150 150
Package Marking A B C D
Open-Drain** TO-92* SOT-23 RESET Output Package Package Polarity Stage
LOW LOW LOW LOW LOW LOW
C C C
A B C
X X X
X X X
* Add /S to Part Number for straight (unformed) leads. (ie. IMP18xx-x/S) ** Internal 5.5k resistor pull up. *** Add /T to Part Number for Tape and Reel. (ie. IMP18xx-x/T)
2
408-432-9100/www.impweb.com
XX = Date code
(c) 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 . . . . . . . . . . . -40C to 85C Voltages measured with respect to ground. These are stress ratings only and functional operation is not implied. Soldering Temperature . . . . . . . . . . . . . . . . . . 260C for 10 seconds Storage Temperature . . . . . . . . . . . . . . . . . . . -55C to 125C
Electrical Characteristics
Unless otherwise noted, VCC = 1.2V to 5.5V and specifications are over the operating temperature range of - 40C to +85C. All voltages are referenced to ground.
Parameter
Supply Voltage Output Voltage Output Current Operating Current VCC Trip Point (IMP1811-5) VCC Trip Point (IMP1811-10) VCC Trip Point (IMP1811-15) Internal Pull-Up Resistor Output Capacitance RESET Active Time VCC Detect to RESET Low VCC Slew Rate (VCCTP (MAX) to VCCTP (MIN)) VCC Slew Rate (VCCTP (MIN) to VCCTP (MAX)) VCC Detect to RESET High
Symbol
VCC VOH IOL ICC VCCTP VCCTP VCCTP RP C OUT t RESET t RPD tF tR t RPU
Conditions
IOUT < 500A Output = 0.4V, VCC 2.7V VCC < 5.5V, RESET output open
Min
1.2 VCC - 0.5V +10
Typ
VCC - 0.1V 8
Max
5.5
Units
V V mA
20 4.75 4.49 4.24 7.5 10 250 5
A V V V k pF ms s s ns
4.50 4.25 4.00 3.5 100 300 0 t r = 5s 100
4.62 4.35 4.13 5.5 150 2
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.
(c) 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 (MAX) VCCTP VOL
1811_08.eps
VCCTP (MIN)
VCC tRPU VOH RESET
1811_07.eps
Figure 2. Timing Diagram: Power-Down
Figure 1. Timing Diagram: Power-Up
4
408-432-9100/www.impweb.com
(c) 1999 IMP, Inc.
IMP18 1 2
POWER MANAGEMENT
Low Power, 5V P Reset
Key Features
x Improved Dallas DS1812 replacement -- Over 50% lower maximum supply current x Low Supply Current -- 20A maximum (5.5V) x Automatically restarts a microprocessor after power failure x 150ms reset delay after VCC returns to an in-tolerance condition x Active HIGH 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 - 40C to +85C
- 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 20A, 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.
Family Selection Guide
Part
IMP1810 IMP1811 IMP1812 IMP1815 IMP1816 IMP1817 IMP1233D IMP1233M
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
Push-Pull Open-Drain Push-Pull Push-Pull Open-Drain Push-Pull Open-Drain Open-Drain
RESET Polarity
LOW LOW HIGH LOW LOW HIGH LOW LOW
Applications
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
VCC 1 VCC Supply Tolerance Bias
Typical Application
IMP1812 IMP1812
+ -
Microprocessor Delay 150ms Typical 2 RESET RESET RESET
Reference 3 GND
(c) 1999 IMP, Inc.
GND
1812_02.eps 1812_01.eps
408-432-9100/www.impweb.com
1
IMP18 1 2
Pin Configuration
SOT23
RESET 1 IMP1812-X 3 GND
TO-92*
IMP1812-X
VCC
2
1812_03.eps
1
2
3
1812_04.eps
Pin Descriptions
Pin Number
1 2 3
Name
RESET VCC GND
Function
Active HIGH reset output Power supply input Ground
Package Marking Code
SOT-23 Package Letter Code A
D D D
3
B
A B C
Part
IMP1812 IMP1812 IMP1812
Reset Tolerance
5% 10% 15%
1812_t02.eps
A
1
B
C
D
2
1812_05a.eps
Ordering Information
Device Summary Part** Number
IMP1812-5 IMP1812-10 IMP1812-15 IMP1812R-5 IMP1812R-10 IMP1812R-15
Package Marking RESET Polarity
HIGH HIGH HIGH HIGH HIGH HIGH D D D A B C X X X X X X
RESET RESET RESET Push-Pull Output TO-92* SO -23 r ime Output Package PacTage Voltage Tole%ance Tms) k () ( Stage (V)
4.62 4.35 4.13 4.62 4.35 4.13 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)
2
408-432-9100/www.impweb.com
XX = Date code
(c) 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 . . . . . . . . . . . -40C to 85C Voltages measured with respect to ground. These are stress ratings only and functional operation is not implied. Soldering Temperature . . . . . . . . . . . . . . . . . . 260C for 10 seconds Storage Temperature . . . . . . . . . . . . . . . . . . . -55C to 125C
Electrical Characteristics
Unless otherwise noted, VCC = 1.2V to 5.5V and specifications are over the operating temperature range of - 40C to +85C. All voltages are referenced to ground.
Parameter
Supply Voltage Output Voltage Output Current Output Current Operating Current VCC Trip Point (IMP1812-5) VCC Trip Point (IMP1812-10) VCC Trip Point (IMP1812-15) Output Capacitance RESET Active Time VCC Detect to RESET Low VCC Slew Rate (VCCTP (MAX) to VCCTP (MIN)) VCC Slew Rate (VCCTP (MIN) to VCCTP (MAX)) VCC Detect to RESET High
Symbol
VCC VOH IOH IOL ICC VCCTP VCCTP VCCTP C OUT t RESET t RPD tF tR t RPU
Conditions
IOUT < 500A Output = 2.4V, VCC 2.7V Output = 0.4V, VCC 2.7V VCC < 5.5V, RESET output open
Min
1.2 VCC - 0.5V +10
Typ
VCC - 0.1V 350 8
Max
5.5
Units
V V A mA
20 4.75 4.49 4.24 10 250 5
A V V V pF ms s s ns
4.50 4.25 4.00 100 300 0 t R = 5s 100
4.62 4.35 4.13 150 2
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.
(c) 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 VCCTP (MIN)
tRPD VOH RESET Slews with VCC RESET
1812_07.eps
tR VCCTP (MAX) VCCTP
VCCTP (MIN)
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
(c) 1999 IMP, Inc.
IMP18 1 5
POWER MANAGEMENT
Low Power, 3.3V/3.0V P 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 15A, 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
x Improved Dallas DS1815 replacement -- Over 50% lower maximum supply current x Low Supply Current -- 20A maximum (5.5V) -- 15A maximum (3.6V) x Automatically restarts a microprocessor after power failure x 150ms reset delay after VCC 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 - 40C to +85C
Family Selection Guide
Part
IMP1810 IMP1811 IMP1812 IMP1815 IMP1816 IMP1817 IMP1233D IMP1233M
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
Push-Pull Open-Drain Push-Pull Push-Pull Open-Drain Push-Pull Open-Drain Open-Drain
RESET Polarity
LOW LOW HIGH LOW LOW HIGH LOW LOW
Applications
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
VCC 1 VCC Supply Tolerance Bias
Typical Application
IMP1815 IMP1815
+ -
Delay 150ms Typical Microprocessor 2 RESET RESET RESET
Reference 3 GND
(c) 1999 IMP, Inc.
GND
1815_02.eps 1815_01.eps
408-432-9100/www.impweb.com
1
IMP18 1 5
Pin Configuration
SOT23
RESET 1 IMP1815-X 3 GND
TO-92*
IMP1815-X
VCC
2
1815_03.eps
1
2
3
1815_04.eps
Pin Descriptions
Pin Number
1 2 3
Name
RESET VCC GND
Function
Active LOW reset output Power supply input Ground
Package Marking Code
SOT-23 Package Letter Code A
E E E
3
B
A B D
Part
IMP1815 IMP1815 IMP1815
Reset Tolerance
5% 10% 20%
1815_t02.eps
A
1
B
C
D
2
1815_05a.eps
Ordering Information
Device Summary Part** Number
IMP1815-5 IMP1815-10 IMP1815-20 IMP1815R-5 IMP1815R-10 IMP1815R-20
Package Marking RESET Polarity
LOW LOW LOW LOW LOW LOW E E E A B D X X X X X X
RESET RESET RESET Push-Pull Output TO-92* SO -23 r ime Output Package PacTage Voltage Tole%ance Tms) k () ( Stage (V)
3.06 2.88 2.55 3.06 2.88 2.55 5 10 20 5 10 20 150 150 150 150 150 150
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
(c) 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 . . . . . . . . . . . -40C to 85C Voltages measured with respect to ground. These are stress ratings only and functional operation is not implied. Soldering Temperature . . . . . . . . . . . . . . . . . . 260C for 10 seconds Storage Temperature . . . . . . . . . . . . . . . . . . . -55C to 125C
Electrical Characteristics
Unless otherwise noted, VCC = 1.2V to 5.5V and specifications are over the operating temperature range of - 40C to +85C. All voltages are referenced to ground.
Parameter
Supply Voltage Output Voltage Output Current Output Current Operating Current Operating Current VCC Trip Point (IMP1815-5) VCC Trip Point (IMP1815-10) VCC Trip Point (IMP1815-20) Output Capacitance VCC Detect to RESET VCC Slew Rate (VCCTP (MAX) to VCCTP (MIN)) VCC Slew Rate (VCCTP (MIN) to VCCTP (MAX)) VCC Detect to RESET
Symbol
VCC VOH IOH IOL ICC ICC VCCTP VCCTP VCCTP C OUT t RPD tF tR t RPU
Conditions
IOUT < 500A Output = 2.4V, VCC 2.7V Output = 0.4V, VCC 2.7V VCC < 5.5V, RESET output open VCC 3.6V, RESET output open
Min
1.2 VCC - 0.5V +10
Typ
VCC - 0.1V 350 8 6
Max
5.5
Units
V V A mA
20 15 3.15 2.97 2.64 10 5
A A V V V pF s s ns
2.98 2.80 2.47
3.06 2.88 2.55 2
Note 1
300 0
t R = 5s
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.
(c) 1999 IMP, Inc.
408-432-9100/www.impweb.com
3
IMP18 1 5
Application Information
Operation - Power Monitor
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.
Output Conditions
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 100k should be adequate to maintain a valid condition.
tR VCCTP (MAX) VCCTP
VCCTP (MIN)
IMP1815
Microprocessor RESET 100k RESET
1815_06.eps 1815_07.eps
VCC tRPU VOH
RESET
Figure 1. RESET Valid to 0V VCC
Figure 2. Timing Diagram: Power-Up
tF VCC VCCTP (MAX) VCCTP VCCTP (MIN)
tRPD RESET
VOL
1815_08.eps
Figure 3. Timing Diagram: Power-Down
4
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(c) 1999 IMP, Inc.
IMP18 16
POWER MANAGEMENT
Low Power, 3.3V/3.0V P 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 15A, 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
x Improved Dallas DS1816 replacement -- Over 70% lower maximum supply current x Low Supply Current -- 20A maximum (5.5V) -- 15A maximum (3.6V) x Automatically restarts a microprocessor after power failure x 150ms reset delay after VCC 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 Operating temperature - 40C to +85C
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
VCC 1 VCC Supply Tolerance Bias
Typical Application
IMP1816
+ -
Delay 150ms Typical
5.5k 2
IMP1816
RESET RESET Microprocessor RESET
Reference 3 GND
(c) 1999 IMP, Inc.
GND
1816_02.eps 1816_01.eps
408-432-9100/www.impweb.com
1
IMP18 16
Pin Configuration
SOT23
RESET 1 IMP1816-X 3 GND
TO-92*
IMP1816-X
VCC
2
1816_03.eps
1
2
3
1816_04.eps
Pin Descriptions
Pin Number
1 2 3
Name
RESET VCC GND
Function
Active LOW reset output Power supply input Ground
Package Marking Code
SOT-23 Package Letter Code A
K K K
3
B
A B D
Part
IMP1816 IMP1816 IMP1816
Reset Tolerance
5% 10% 20%
1816_t02.eps
A
1
B
C
D
2
1816_05a.eps
Ordering Information
Device Summary RESET SET Part*** Output TRlErance RESET oe Time Number Voltage (%) (ms) (V)
IMP1816-5 IMP1816-10 IMP1816-20 IMP1816R-5 IMP1816R-10 IMP1816R-20 3.06 2.88 2.55 3.06 2.88 2.55 5 10 20 5 10 20 150 150 150 150 150 150
Package Marking A B C D
Open-Drain** TO-92* SOT-23 RESET Output Package Package Polarity Stage
LOW LOW LOW LOW LOW LOW
K K K
A B D
X X X
X X X
* Add /S to Part Number for straight (unformed) leads. (ie. IMP18xx-x/S)
** Internal 5.5k resistor pull up.
XX = Date code
*** Add /T to Part Number for Tape and Reel. (ie. IMP18xx-x/T)
2
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(c) 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 . . . . . . . . . . . -40C to 85C Voltages measured with respect to ground. These are stress ratings only and functional operation is not implied. Soldering Temperature . . . . . . . . . . . . . . . . . . 260C for 10 seconds Storage Temperature . . . . . . . . . . . . . . . . . . . -55C to 125C
Electrical Characteristics
Unless otherwise noted, VCC = 1.2V to 5.5V and specifications are over the operating temperature range of - 40C to +85C. All voltages are referenced to ground.
Parameter
Supply Voltage Output Voltage Output Current Operating Current Operating Current VCC Trip Point (IMP1816-5) VCC Trip Point (IMP1816-10) VCC Trip Point (IMP1816-20) Internal Pull-Up Resistor Output Capacitance VCC Detect to RESET Low VCC Slew Rate (VCCTP (MAX) to VCCTP (MIN)) VCC Slew Rate (VCCTP (MIN) to VCCTP (MAX)) VCC Detect to RESET High
Symbol
VCC VOH IOL ICC ICC VCCTP VCCTP VCCTP RP C OUT t RPD tF tR t RPU
Conditions
IOUT < 500A Output = 0.4V, VCC 2.7V VCC < 5.5V, RESET output open VCC 3.6V, RESET output open
Min
1.2 VCC - 0.5V +10
Typ
VCC - 0.1V 8 6
Max
5.5
Units
V V mA
20 15 3.15 2.97 2.64 7.5 10 5
A A V V V k pF s s ns
2.98 2.80 2.47 3.5
3.06 2.88 2.55 5.5 2
Note 1
300 0
t R = 5s
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.
(c) 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 (MAX) VCCTP VOL
1816_07.eps
VCCTP (MIN)
VCC tRPU VOH RESET
1816_06.eps
Figure 2. Timing Diagram: Power-Down
Figure 1. Timing Diagram: Power-Up
4
408-432-9100/www.impweb.com
(c) 1999 IMP, Inc.
IMP18 17
POWER MANAGEMENT
Low Power, 3.3V/3.0V P 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 15A, 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
x Improved Dallas DS1817 replacement -- Over 50% lower maximum supply current x Low Supply Current -- 20A maximum (5.5V) -- 15A maximum (3.6V) x Automatically restarts a microprocessor after power failure x 150ms reset delay after VCC returns to an in-tolerance condition x Active HIGH 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 - 40C to +85C
Family Selection Guide
Part
IMP1810 IMP1811 IMP1812 IMP1815 IMP1816 IMP1817 IMP1233D IMP1233M
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
Push-Pull Open-Drain Push-Pull Push-Pull Open-Drain Push-Pull Open-Drain Open-Drain
RESET Polarity
LOW LOW HIGH LOW LOW HIGH LOW LOW
Applications
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
VCC 1 VCC Supply Tolerance Bias
Typical Application
IMP1817 IMP1817
+ -
Microprocessor Delay 150ms Typical 2 RESET RESET RESET
Reference 3 GND
(c) 1999 IMP, Inc.
GND
1817_02.eps 1817_01.eps
408-432-9100/www.impweb.com
1
IMP18 17
Pin Configuration
SOT23
RESET 1 IMP1817-X 3 GND
TO-92*
IMP1817-X
VCC
2
1817_03.eps
1
2
3
1817_04.eps
Pin Descriptions
Pin Number
1 2 3
Name
RESET VCC GND
Function
Active LOW reset output Power supply input Ground
Package Marking Code
SOT-23 Package Letter Code A
M M M
3
B
A B C
Part
IMP1817 IMP1817 IMP1817
Reset Tolerance
5% 10% 20%
1817_t02.eps
A
1
B
C
D
2
1817_05a.eps
Ordering Information
Device Summary Part** Number
IMP1817-5 IMP1817-10 IMP1817-20 IMP1817R-5 IMP1817R-10 IMP1817R-20
Package Marking RESET Polarity
LOW LOW LOW LOW LOW LOW M M M A B C X X X X X X
RESET RESET RESET Push-Pull Output TO-92* SO -23 r ime Output Package PacTage Voltage Tole%ance Tms) k () ( Stage (V)
3.06 2.88 2.55 3.06 2.88 2.55 5 10 20 5 10 20 150 150 150 150 150 150
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)
2
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XX = Date code
(c) 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 . . . . . . . . . . . -40C to 85C Voltages measured with respect to ground. These are stress ratings only and functional operation is not implied. Soldering Temperature . . . . . . . . . . . . . . . . . . 260C for 10 seconds Storage Temperature . . . . . . . . . . . . . . . . . . . -55C to 125C
Electrical Characteristics
Unless otherwise noted, VCC = 1.2V to 5.5V and specifications are over the operating temperature range of - 40C to +85C. All voltages are referenced to ground.
Parameter
Supply Voltage Output Voltage Output Current Output Current Operating Current Operating Current VCC Trip Point (IMP1817-5) VCC Trip Point (IMP1817-10) VCC Trip Point (IMP1817-20) Output Capacitance VCC Detect to RESET Low VCC Slew Rate (VCCTP (MAX) to VCCTP (MIN)) VCC Slew Rate (VCCTP (MIN) to VCCTP (MAX)) VCC Detect to RESET High
Symbol
VCC VOH IOH IOL ICC ICC VCCTP VCCTP VCCTP C OUT t RPD tF tR t RPU
Conditions
IOUT < 500A Output = 2.4V, VCC 2.7V Output = 0.4V, VCC 2.7V VCC < 5.5V, RESET output open VCC 3.6V, RESET output open
Min
1.2 VCC - 0.5V +10
Typ
VCC - 0.1V 350 8 6
Max
5.5
Units
V V A mA
20 15 3.15 2.97 2.64 10 5
A A V V V pF s s ns
2.98 2.80 2.47
3.06 2.88 2.55 2
Note 1
300 0
t R = 5s
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.
(c) 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 (MAX) VCCTP
VCCTP (MIN)
IMP1817
Microprocessor RESET RESET VIN tRPU
RESET
1815_07.eps
VOL
1817_07.eps
Figure 1. RESET Valid to 0V VCC
Figure 2. Timing Diagram: Power-Up
tF VCC VCCTP (MAX) VCCTP VCCTP (MIN)
tRPD VOH RESET Slews with VCC RESET
1817_08.eps
Figure 3. Timing Diagram: Power-Down
4
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(c) 1999 IMP, Inc.
IMP1 233D
POWER MANAGEMENT
Low Power, 5V P Reset
Key Features
x Improved Dallas DS1233D replacement -- Over 60% lower maximum supply current x Low Supply Current -- 20A maximum (5.5V) -- 15A maximum (3.6V) x Automatically restarts a microprocessor after power failure x 350ms reset delay after VCC returns to an in-tolerance condition x Active LOW power-up reset, 5k internal pull-up x Precision temperature-compensated voltage reference and comparator x Eliminates external components x Motorola 68xxx and HC16 compatible x Low-cost TO-92 package x Compact surface mount SOT-223 package x Operating temperature - 40C to +85C
- 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 20A, 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.
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
VCC VCC Supply Tolerance Bias
Typical Application
IMP1233D
+ -
Delay 350ms Typical
5.0k
IMP1233D
RESET RESET Microprocessor RESET
Reference
GND
GND
(c) 1999 IMP, Inc.
1233D_02.eps 1233D_01.eps
408-432-9100/www.impweb.com
1
IMP1 233D
Pin Configuration
SOT-223
RESET 2
IMP1233D-X
TO-92*
IMP1233D-X
GND
4
1
GND
VCC
3
1233D_03.eps
1
2
3
1233D_04.eps
Pin Descriptions
Pin Numbers SOT-223
1 2 3 4
TO-92
1 2 3 --
Name
GND RESET VCC GND
Function
Ground Active LOW reset output Power supply input Ground (SOT-223 Only)
Package Marking Code
1
Package Letter Code A
3
B
3
C
D
Part Type
IMP1233D
Package Letter Code D
A B C
Reset Tolerance
5% 10% 15%
A
2
B
4
C
D
3
1233D_05a.eps
Ordering Information
Device Summary Part Number
IMP1233D-5 IMP1233D-10 IMP1233D-15 IMP1233DZ-5 IMP1233DZ-10 IMP1233DZ-15
Package Marking D B A = 5% C B = 10% C = 15%
RESET Output Voltage (V)
4.625 4.375 4.125 4.625 4.375 4.125
Output Stage RESET RESET TO-92* SOT-223** RESET *** Tolerance Time Open-Drain Push-Pull Package Package Polarity A (%) (ms)
5 10 15 5 10 15 350 350 350 350 350 350 X X X X X X X X X X X X LOW LOW LOW LOW LOW LOW 3 3 3 3 3 3 D D D
A B C
1233D_t03.eps
* 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 5k resistor pull up. 2
408-432-9100/www.impweb.com
(c) 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 . . . . . . . . . . . -40C to 85C Voltages measured with respect to ground. These are stress ratings only and functional operation is not implied. Soldering Temperature . . . . . . . . . . . . . . . . . . 260C for 10 seconds Storage Temperature . . . . . . . . . . . . . . . . . . . -55C to 125C
Electrical Characteristics
Unless otherwise noted, VCC = 1.2V to 5.5V and specifications are over the operating temperature range of - 40C to +85C. All voltages are referenced to ground.
Parameter
Supply Voltage Output Voltage Output Current Operating Current Operating Current VCC Trip Point (IMP1233D-5) VCC Trip Point (IMP1233D-10) VCC Trip Point (IMP1233D-15) Internal Pull-Up Resistor Output Capacitance RESET Active Time VCC Detect to RESET Low VCC Slew Rate (VHTL - VLTL) VCC Slew Rate (VLTL - VHTL) VCC Detect to RESET High
Symbol
VCC VOH IOL ICC ICC VCCTP VCCTP VCCTP RP C OUT t RESET t RPD tF tR t RPU
Conditions
IOUT < 500A Output = 0.4V, VCC 2.7V VCC < 5.5V, RESET output open VCC 3.6V, RESET output open
Min
1.2 VCC - 0.5V +8
Typ
VCC - 0.1V 8 6
Max
5.5
Units
V V mA
20 15 4.74 4.49 4.24 7.5 10 450 5
A A V V V k pF ms s s ns
4.50 4.25 4.00 3.5 250 300 0 t R = 5s 250
4.625 4.375 4.125 5.0 350 2
350
450
ms
(c) 1999 IMP, Inc.
408-432-9100/www.impweb.com
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
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(c) 1999 IMP, Inc.
IMP1 233M
POWER MANAGEMENT
Low Power, 5V/3.0V P Reset
Key Features
x Improved Dallas DS1233M replacement -- 60% lower maximum supply current x Low Supply Current -- 20A maximum (5.5V) -- 15A maximum (3.6V) x Automatically restarts a microprocessor after power failure x 350ms reset delay after VCC returns to an in-tolerance condition x Active LOW power-up reset, 5k internal pull-up x Precision temperature-compensated voltage reference and comparator x Eliminates external components x Pin function compatible with the Motorola MC33064, MC34064, MC33164 and MC34164 x Motorola 68xxx and HC16 compatible x Low-cost TO-92 package x Compact surface mount SO-8 package x Operating temperature - 40C to +85C
- 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 20A, 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
Part
IMP1810 IMP1811 IMP1812 IMP1815 IMP1816 IMP1817 IMP1233D IMP1233M
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
Push-Pull Open-Drain Push-Pull Push-Pull Open-Drain Push-Pull Open-Drain Open-Drain
RESET Polarity
LOW LOW HIGH LOW LOW HIGH LOW LOW
Applications
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
VCC VCC Supply Tolerance Bias
Typical Application
IMP1233M
+ -
Delay 350ms Typical
5.0k
IMP1233M
RESET RESET Microprocessor RESET
Reference
GND
GND
1233M_02.eps 1233M_01.eps
(c) 1999 IMP, Inc.
408-432-9100/www.impweb.com
1
IMP1 233M
Pin Configuration
SO-8
RESET VCC NC GND 1 2 3 4 IMP1233M 8 7 6 5 NC NC NC NC
TO-92*
IMP1233M-X
1233M_03.eps
1
2
3
1233M_04.eps
Pin Descriptions
Pin Numbers SO-8
1 2 3, 5, 6, 7 and 8 4
TO-92
1 2 -- 3
Name
RESET VCC NC GND
Function
Active LOW reset output Power supply input No connection Ground
Ordering Information
Device Summary Part Number
IMP1233M-55 IMP1233M-5 IMP1233M-3 IMP1233MS-55 IMP1233MS-5 IMP1233MS-3
RESET Output Voltage (V)
4.625 4.375 2.720 4.625 4.375 2.720
Output Stage RESET RESET TO-92* Tolerance Time Package (%) (ms) Open-Drain** Push-Pull
5 10 15 5 10 15 350 350 350 350 350 350 X X X X X X X X X
SO-8 Package
RESET Polarity
LOW LOW LOW
X X X
LOW LOW LOW
1233M03
* Add /S to Part Number for straight (unformed) leads. (ie. IMP18xx-x/S) ** Internal 5k resistor pull up.
2
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(c) 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 . . . . . . . . . . . -40C to 85C Voltages measured with respect to ground. These are stress ratings only and functional operation is not implied. Soldering Temperature . . . . . . . . . . . . . . . . . . 260C for 10 seconds Storage Temperature . . . . . . . . . . . . . . . . . . . -55C to 125C
Electrical Characteristics
Unless otherwise noted, VCC = 1.2V to 5.5V and specifications are over the operating temperature range of - 40C to +85C. All voltages are referenced to ground.
Parameter
Supply Voltage Output Voltage Output Current Operating Current Operating Current VCC Trip Point (IMP1233M-5) VCC Trip Point (IMP1233M-55) VCC Trip Point (IMP1233M-3) Voltage High Trip Level IMP1233M-5 IMP1233M-55 Voltage Low Trip Level IMP1233M-5 IMP1233M-55 Voltage High Trip Level IMP1233M-3 Voltage Low Trip Level IMP1233M-3 Internal Pull-Up Resistor Output Capacitance VCC Detect to RESET Low VCC Slew Rate (VHTL - VLTL) VCC Slew Rate (VLTL - VHTL) VCC Detect to RESET High
Symbol
VCC VOH IOL ICC ICC VCCTP VCCTP VCCTP VHTL
Conditions
IOUT < 500A Output = 0.4V, VCC 2.7V VCC < 5.5V, RESET output open VCC 3.6V, RESET output open
Min
1.2 VCC - 0.5V +8
Typ
VCC - 0.1V 8 6
Max
5.5
Units
V V mA
20 15 4.49 4.75 2.8 4.75
A A V V V V
4.25 4.5 2.64
4.375 4.625 2.72
VLTL
4.00
V
VHTL VLTL RP C OUT t RPD tF tR t RPU t R = 5s 300 0 200 350 2 3.5 5.0
3.14 2.48 7.5 10 10
V V k pF s s ns
500
ms
Notes: 1. A 1k external resistor maybe required in some applications for proper operation of the microprocessor reset control circuit.
(c) 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
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(c) 1999 IMP, Inc.
P ac k ag e Inf or mation
Package Dimensions
Plastic SOT-23 (3-Pin)
B
Inches Min
E H
Millimeters Max Min Max Plastic SOT-23 (3-Pin)
S D
e
A
a
A1
e1
C
L
SOT-23 (3-Pin).eps
Plastic SOT-223 (4-Pin)
B
A A1 B C D E e e1 H L S A A1 B B1 C D e e1 E h S t Q Q1 Q2 A A1 B C e E H L D
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 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 0.053 0.004 0.013 0.007 0.050 0.150 0.228 0.016 0.189 0.157 0.244 0.050 0.197 0.069 0.010 0.020 0.010
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 1.70 0.10 3.15 0.85 0.35 6.70 2.30 NOM 4.50 NOM 3.70 7.30 1.05 1.30 10 MAX 16 16 1.35 0.10 0.33 0.19 1.27 3.80 5.80 0.40 4.80 4.00 6.20 1.27 2.00 10 10 1.75 0.25 0.51 0.25 3.30 6.70 0.85 1.10 1.50 0.02 2.95 0.65 0.25 6.30
Plastic SOT-223** (4-Pin)
E H
S
e Q1 Q B1 Q2
D A A1 e1
C
SOT-223 (4-Pin).eps
Plastic SO-8 (8-Pin)
0- 8
L
E
H
Plastic SO-8 (8-Pin)
C D A
e B A1
SO (8-Pin).eps
TO-92 (3-Pin)
A
TO-92* (3-Pin)
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
B M
L
Section A-A C D J Section A-A E K
D
F
G 1 H 2 3 I Bottom View
TO-92.eps
(c) 1999 IMP, Inc.
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: info@impinc.com 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.
(c) 1999 IMP, Inc. Printed in USA Publication #: 1002 Revision: A Issue Date: 06/15/99 Type: Preliminary

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