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IMP1 233D
POWER MANAGEMENT
Low Power, 5V P Reset
Key Features
N Improved Dallas DS1233D replacement -- Over 60% lower maximum supply current N Low Supply Current -- 20A maximum (5.5V) -- 15A maximum (3.6V) N Automatically restarts a microprocessor after power failure N 350ms reset delay after VCC returns to an in-tolerance condition N Active LOW power-up reset, 5k internal pull-up N Precision temperature-compensated voltage reference and comparator N Eliminates external components N Motorola 68xxx and HC16 compatible N Compact surface mount SOT-223 package N 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. 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, 4.620, 4.620, 3.060, 3.060, 3.060, 4.625, 4.625, 4.370, 4.350, 4.350, 2.880, 2.880, 2.880, 4.375, 4.375, 4.120 4.130 4.130 2.550 2.550 2.550 4.125 2.720 150 150 150 150 150 150 350 350
RESET Polarity
LOW LOW HIGH LOW LOW HIGH LOW LOW
N N N N N N N
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
5.0k9
IMP1233D
RESET RESET Microprocessor RESET
Reference
GND
GND 2000 (c) IMP, Inc.
1233D_02.eps 1233D_01.eps
408-432-9100/www.impweb.com
1
IMP1233D
Pin Configuration
SOT-223
RESET 2
IMP1233D-X
GND
4
1
GND
VCC
3
1233D_03.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
IMP1233DZ-5/T IMP1233DZ-10/T IMP1233DZ-15/T
Package Marking Output Stage D SOT-223 Package
" " "
RESET Output Voltage (V)
4.625 4.375 4.125
RESET Tolerance (%)
5 10 15
RESET Time (ms)
350 350 350
* Open-Drain Push-Pull
" " "
RESET Polarity
LOW LOW LOW
A
3 3 3
B
3 3 3
C
D D D
A = 5% B = 10% C = 15%
A B C
1233D_t03.eps
* Internal 5k resistor pull up. ** /T indicates Tape and Reel. 2
408-432-9100/www.impweb.com
2000 (c) IMP, Inc.
!
IMP1233D
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
2000 (c) IMP, Inc.
Microprocessor Supervisor
3
IMP1233D
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
2000 (c) IMP, Inc.
!
IMP1233D
Package Dimensions
Plastic SOT-223 (4-Pin)
B
Inches Min Max
Millimeters Min
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 10 10
1233D_t05.eps
Max
1.50 0.02 2.95 0.65 0.25 6.30
Plastic SOT-223* (4-Pin)
A 0.067 0.060 A1 0.004 0.0008 B 0.124 0.116 B1 0.033 0.026 C 0.014 0.010 D 0.264 0.248 e 0.0905 NOM e1 0.181 NOM E 0.146 0.130 h 0.287 0.264 S 0.041 0.033 t 0.051 0.043 Q 10 MAX Q1 16 10 Q2 16 10 * Formed leads are standard.
E
H
S
e Q1 Q B1 Q2
D A A1 e1
3.30 6.70 0.85 1.10
C
SOT-223 (4-Pin).eps
2000 (c) IMP, Inc.
Microprocessor Supervisor
5
IMP1233D
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 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.
2000 (c) IMP, Inc. Printed in USA Publication #: 1012 Revision: B Issue Date: 06/01/00 Type: Preliminary

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