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. 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 ◆ Compact surface mount SOT-223 package ◆ Operating temperature – 40°C to +85°C Applications Family Selection Guide Part IMP1810 IMP1811 IMP1812 IMP1815 IMP1816 IMP1817 IMP1233D IMP1233M 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 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 5.0kW IMP1233D RESET + – Delay 350ms Typical RESET RESET GND Reference GND 2000 © IMP, Inc. Microprocessor 1233D_02.eps 1233D_01.eps 408-432-9100/www.impweb.com 1 IMP1233D Pin Configuration SOT-223 RESET 2 GND 4 VCC 3 IMP1233D-X 1 GND 1233D_03.eps Pin Descriptions Pin Numbers SOT-223 TO-92 1 2 3 4 1 2 3 — 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 Reset Tolerance A B C A 5% 10% 15% 2 B C 4 D 3 1233D_05a.eps Ordering Information Device Summary Part** Number RESET Output Voltage (V) Package Marking Output Stage RESET Tolerance (%) RESET Time (ms) * Open-Drain Push-Pull D SOT-223 Package RESET Polarity A B C A = 5% B = 10% C = 15% IMP1233DZ-5/T 4.625 5 350 " " LOW 3 3 D A IMP1233DZ-10/T 4.375 10 350 " " LOW 3 3 D B IMP1233DZ-15/T 4.125 15 350 " " LOW 3 3 D * Internal 5kΩ resistor pull up. ** /T indicates Tape and Reel. 2 C 1233D_t03.eps 408-432-9100/www.impweb.com 2000 © 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 . . . . . . . . . . . –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 VCC – 0.5V 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 ICC VCC ≤ 3.6V, RESET output open Typ 1.2 Max 5.5 VCC – 0.1V Units V V +8 mA 8 20 µA 6 15 µA 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 350 450 ms 2 5 µs Operating Current Internal Pull-Up Resistor Output Capacitance C OUT RESET Active Time t RESET VCC Detect to RESET Low 250 t RPD VCC Slew Rate (VHTL - VLTL) tF 300 µs VCC Slew Rate (VLTL - VHTL) tR 0 ns VCC Detect to RESET High 2000 © IMP, Inc. t RPU t R = 5µs 250 350 450 Microprocessor Supervisor ms 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 © IMP, Inc. ! IMP1233D Package Dimensions Plastic SOT-223 (4-Pin) Inches Min B Millimeters Max Min Max Plastic SOT-223* (4-Pin) E H e S Q1 D Q A B1 A1 e1 Q2 C SOT-223 (4-Pin).eps 2000 © IMP, Inc. 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. 1.70 0.10 3.15 0.85 0.35 6.70 1.50 0.02 2.95 0.65 0.25 6.30 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° Microprocessor Supervisor 10° 10° 1233D_t05.eps 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: [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 #: 1012 Revision: B Issue Date: 06/01/00 Type: Preliminary