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IMP1 233M
POWER MANAGEMENT
Low Power, 5V/3.0V P Reset
Key Features
N Improved Dallas DS1233M replacement -- 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 Pin function compatible with the Motorola MC33064, MC34064, MC33164 and MC34164 N Motorola 68xxx and HC16 compatible N Compact surface mount SO-8 package N 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. 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
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
IMP1233M
+ -
Delay 350ms Typical
5.0k9
IMP1233M
RESET RESET Microprocessor RESET
Reference
GND
GND
1233M_02.eps 1233M_01.eps
2000 (c) IMP, Inc.
408-432-9100/www.impweb.com
1
IMP1233M
Pin Configuration
SO-8
RESET VCC NC GND 1 2 3 4 IMP1233M 8 7 6 5 NC NC NC NC
1233M_03.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
IMP1233MS-55/T IMP1233MS-5/T IMP1233MS-3/T
RESET Output Voltage (V)
4.625 4.375 2.720
RESET Tolerance (%)
5 10 15
RESET Time (ms)
350 350 350
Output Stage Open-Drain*
" " "
Push-Pull
SO-8 Package
" " "
RESET Polarity
LOW LOW LOW
1233M_t03.eps
* Internal 5k resistor pull up. ** /T indicates Tape and Reel.
2
408-432-9100/www.impweb.com
2000 (c) IMP, Inc.
!
IMP1233M
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.
2000 (c) IMP, Inc.
Microprocessor Supervisor
3
IMP1233M
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
2000 (c) IMP, Inc.
!
IMP1233M
Absolute Maximum Ratings
Plastic SO-8 (8-Pin)
0- 8
Inches Min
A A1 B C e E H L D 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
Millimeters Max
0.069 0.010 0.020 0.010
Min
1.35 0.10 0.33 0.19 1.27 3.80 5.80 0.40 4.80
Max
1.75 0.25 0.51 0.25 4.00 6.20 1.27 2.00
1233M_t5.eps
Plastic SO-8 (8-Pin)
L
E
H
C D A
e B A1
SO (8-Pin).eps
2000 (c) IMP, Inc.
Microprocessor Supervisor
5
IMP1233M
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 #: 1013 Revision: B Issue Date: 06/01/00 Type: Preliminary

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