IMP1 233M POWER MANAGEMENT Low Power, 5V/3.0V µP Reset Key Features – 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. Other low power products in this family include the IMP1810/11/12/15/ 16/17 and IMP1233D. ◆ 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 ◆ Compact surface mount SO-8 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, 4.620, 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 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 IMP1233M 5.0kW IMP1233M RESET + – Delay 350ms Typical RESET RESET GND Reference GND 2000 © IMP, Inc. Microprocessor 1233M_02.eps 1233M_01.eps 408-432-9100/www.impweb.com 1 IMP1233M Pin Configuration SO-8 RESET 1 8 NC VCC 2 7 NC NC 3 6 NC GND 4 5 NC IMP1233M 1233M_03.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 RESET Output Voltage (V) RESET Tolerance (%) RESET Time (ms) Open-Drain* IMP1233MS-55/T 4.625 5 350 IMP1233MS-5/T 4.375 10 IMP1233MS-3/T 2.720 15 Output Stage SO-8 Package RESET Polarity " " LOW 350 " " LOW 350 " " LOW * Internal 5kΩ resistor pull up. ** /T indicates Tape and Reel. 2 Push-Pull 1233M_t03.eps 408-432-9100/www.impweb.com 2000 © 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 . . . . . . . . . . . –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 Output Voltage VOH IOUT < 500µA 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 +8 mA 8 20 µA 6 15 µA 4.25 4.375 4.49 V VCCTP 4.5 4.625 4.75 V VCCTP 2.64 2.72 2.8 V 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 Operating Current VCC Trip Point (IMP1233M-5) VCCTP VCC Trip Point (IMP1233M-55) VCC Trip Point (IMP1233M-3) Voltage High Trip Level IMP1233M-5 IMP1233M-55 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. 2000 © 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 © IMP, Inc. ! IMP1233M Absolute Maximum Ratings Plastic SO-8 (8-Pin) Inches Millimeters Min 0°– 8° L E Max Min Max Plastic SO-8 (8-Pin) H A A1 B C e E H L D 0.053 0.004 0.013 0.007 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 1233M_t5.eps C D A e B 2000 © IMP, Inc. A1 SO (8-Pin).eps 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: [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. 2000 © IMP, Inc. Printed in USA Publication #: 1013 Revision: B Issue Date: 06/01/00 Type: Preliminary