IMP809LEUR-T

IMP809, IMP81 0 POWER MANAGEMENT 3-Pin Microcontroller Power Supply Supervisor The IMP809/IMP810 are 3.0V, 3.3V and 5.0V power supply supervisor circuits optimized for low-power microprocessor (µP), microcontroller (µC) and digital systems. The IMP809/810 are improved drop-in replacements for the Maxim MAX809/810 and feature 60% lower supply current. A reset signal is issued if the power supply voltage drops below a preset reset threshold and is asserted for at least 140ms after the supply has risen above the reset threshold. The IMP809 has an active-low RESET output that is guaranteed to be in the correct state for VCC down to 1.1V. The IMP810 has an active-high RESET output. The reset comparator is designed to ignore fast transients on VCC. Low supply current makes the IMP809/IMP810 ideal for use in portable and battery operated equipment. The IMP809/IMP810 are available in a compact 3-pin SOT23 package. Key Features ◆ Improved Maxim MAX809/MAX810 replacement — Lower supply current…6µA — 80% lower maximum supply current ◆ Monitor 5V, 3.3V and 3V supplies ◆ 140ms min. reset pulse width ◆ Active-low reset valid with 1.1V supply (IMP809) ◆ Small 3-pin SOT-23 package ◆ No external components ◆ Specified over full temperature range — – 40°C to 105°C Applications Six voltage thresholds are available to support 3V to 5V systems: Reset Threshold Suffix Voltage (V) L ◆ ◆ ◆ ◆ ◆ 4.63 M 4.38 J 4.00 T 3.08 S 2.93 R 2.63 Embedded controllers Battery operated systems Intelligent instruments Wireless communication systems PDAs and handheld equipment Block Diagrams VCC VCC IMP809 (IMP810) RESET (RESET) GND VCC µP RESET Input GND 809/10_01.eps IMP, Inc. San Jose, CA 408-432-9100/www.impweb.com IMP809, IMP81 0 Pin Configuration SOT23 GND 1 IMP809 (IMP810) 3 VCC (RESET) RESET 2 809/10_02.eps Ordering Information Part Number 1 Reset Threshold (V) IMP809 Active LOW Reset Temperature Range Pin-Package Package Marking2 (XX Lot Code) AAXX IMP809LEUR-T 4.63 – 40°C to +105°C 3-SOT23 IMP809MEUR-T 4.38 – 40°C to +105°C 3-SOT23 ABXX IMP809JEUR-T 4.00 – 40°C to +105°C 3-SOT23 CWXX IMP809TEUR-T 3.08 – 40°C to +105°C 3-SOT23 ACXX IMP809SEUR-T 2.93 – 40°C to +105°C 3-SOT23 ADXX IMP809REUR-T 2.63 – 40°C to +105°C 3-SOT23 AFXX IMP810LEUR-T 4.63 – 40°C to +105°C 3-SOT23 AGXX IMP810MEUR-T 4.38 – 40°C to +105°C 3-SOT23 AHXX IMP810JEUR-T 4.00 – 40°C to +105°C 3-SOT23 AIXX IMP810TEUR-T 3.08 – 40°C to +105°C 3-SOT23 AJXX IMP810SEUR-T 2.93 – 40°C to +105°C 3-SOT23 AKXX IMP810REUR-T 2.63 – 40°C to +105°C 3-SOT23 ALXX IMP810 Active HIGH Reset Notes: 1. Tape and Reel packaging is indicated by the -T designation. 2. Devices may also be marked with full part number: 809L, 810M etc. XX refers to lot. Related Products Max. Supply Current Package Pins Manual RESET input Package Type Active-HIGH RESET output Active-LOW RESET output 2 IMP809 IMP810 IMP811 IMP812 15µA 3 15µA 3 SOT-23 SOT-23 ■ 15µA 4 ■ SOT-143 15µA 4 ■ SOT-143 ■ ■ ■ IMP809, IMP810 Absolute Maximum Ratings Pin Terminal Voltage with Respect to Ground VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3V to 6.0V RESET, RESET . . . . . . . . . . . . . . . . . . . . . . . . . –0.3V to (VCC + 0.3V) Input Current at VCC . . . . . . . . . . . . . . . . . . . 20mA Output Current: RESET, RESET . . . . . . . . . 20mA Rate of Rise at VCC . . . . . . . . . . . . . . . . . . . . 100V/µs Power Dissipation (TA = 70°C) . . . . . . . . . . 320mW (Derate 4mW/°C above 70°C) Operating Temperature Range . . . . . . . . . . –40°C to 105°C Storage Temperature Range . . . . . . . . . . . . . –65°C to 160°C Lead Temperature (soldering, 10 sec) . . . . . 300°C These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for prolonged time periods may affect device reliability Electrical Characteristics Unless otherwise noted VCC is over the full voltage range, TA = –40°C to 105°C. Typical values at TA = 25°C, VCC = 5V for L/M/J devices, VCC = 3.3V for T/S devices and VCC = 3V for R devices. Parameter Symbol Conditions Input Voltage (VCC) Range VCC Supply Current ICC Reset Threshold VTH TA = 0°C to 70°C TA = – 40°C to 105°C TA = – 40°C to 85°C TA = – 40°C to 85°C TA = 85°C to 105°C TA = 85°C to 105°C L devices M devices J devices T devices S devices R devices Reset Threshold Stability VCC to Reset Delay Reset Active Timeout Period VOL Low RESET Output Voltage (IMP809) VOL High RESET Output Voltage (IMP809) VOH Low RESET Output Voltage (IMP810) VOL High RESET Output Voltage (IMP810) VOH Notes: Min Typ 1.1 1.2 VCC < 5.5V, L/M/J VCC < 3.6V, R/S/T VCC < 5.5V, L/M/J VCC < 3.6V, R/S/T TA = 25°C TA = – 40°C to 85°C TA = 85°C to 105°C TA = 25°C TA = – 40°C to 85°C TA = 85°C to 105°C TA = 25°C TA = – 40°C to 85°C TA = 85°C to 105°C TA = 25°C TA = – 40°C to 85°C TA = 85°C to 105°C TA = 25°C TA = – 40°C to 85°C TA = 85°C to 105°C TA = 25°C TA = – 40°C to 85°C TA = 85°C to 105°C 9 6 4.56 4.50 4.40 4.31 4.25 4.16 3.93 3.89 3.80 3.04 3.00 2.92 2.89 2.85 2.78 2.59 2.55 2.50 VCC = VTH to VTH - 100mV TA = – 40°C to 85°C 140 TA = 85°C to 105°C 100 VCC = VTH min., ISINK = 1.2mA, IMP809R/S/T VCC = VTH min., ISINK = 3.2mA, IMP809L/M/J VCC > 1.1V, ISINK = 50µA VCC > VTH max., ISOURCE = 500µA, IMP809R/S/T 0.8VCC VCC > VTH max., ISOURCE = 800µA, IMP809L/M/J VCC -1.5 VCC = VTH max., ISINK = 1.2mA, IMP810R/S/T VCC = VTH max., ISINK = 3.2mA, IMP810L/M/J 1.8V < VCC < VTH min., ISOURCE = 150µA 0.8VCC 4.63 4.38 4.00 3.08 2.93 2.63 30 20 240 Max Units 5.5 5.5 15 10 25 20 4.70 4.75 4.86 4.45 4.50 4.56 4.06 4.10 4.20 3.11 3.15 3.23 2.96 3.00 3.08 2.66 2.70 2.76 V 560 840 0.3 0.4 0.3 µA V ppm/°C µs ms V V 0.3 0.4 V V 1. Production testing done at TA = 25°C. Over-temperature specifications guaranteed by design only. 2.RE SE T output is active LOW for the IMP809 and RESET output is active HIGH for the IMP810 3 IMP809, IMP81 0 Pin Descriptions Pin Number Name 1 GND Function 2 (IMP809) RESET RESET is asserted LOW if VCC falls below the reset threshold and remains LOW for the 240ms typical reset timeout period (140ms minimum) after VCC exceeds the threshold. 2 (IMP810) RESET RESET is asserted HIGH if VCC falls below the reset threshold and remains HIGH for the 240ms typical reset timeout period (140ms minimum) after VCC exceeds the threshold. 3 VCC Ground Power supply input voltage (3.0V, 3.3V, 5.0V) Detailed Descriptions Reset Timing The reset signal is asserted–LOW for the IMP809 and HIGH for the IMP810–when the VCC signal falls below the threshold trip voltage and remains asserted for 140ms minimum after the VCC has risen above the threshold. 5V VCC VTH Active Reset Timeout Period 0V 140ms minimum 5V RESET IMP809 0V 5V RESET IMP810 0V 809/10_03.eps Figure 1. Reset Timing Diagram 4 IMP809, IMP810 Application Information Negative VCC Transients The IMP809/810 protect µPs from brownouts and low VCC. Short duration transients of 100mV amplitude and 20µs or less duration typically do not cause a false RESET. Valid Reset with VCC under 1.1V To ensure logic inputs connected to the IMP809 RESET pin are in a known state when VCC is under 1.1V, a 100kΩ pull-down resistor at RESET is needed. The value is not critical. A pull-up resistor to VCC is needed with the IMP810. VCC VCC 100kΩ Power Supply IMP809 IMP810 Power Supply RESET RESET 100kΩ GND GND 809/10_05.eps 809/10_04.eps Figure 3. RESET Valid with VCC Under 1.1V Figure 2. RESET Valid with VCC Under 1.1V Bi-directional Reset Pin Interfacing The IMP809/810 can interface with µP/µC bi-directional reset pins by connecting a 4.7kΩ resistor in series with the IMP809/810 reset output and the µP/µC bi-directional reset pin. BUF Buffered RESET VCC Power Supply IMP809 µC or µP 4.7kΩ RESET RESET Input GND GND Bi-directional I/O Pin (Example: 68HC11) 809/10_06.eps Figure 4. Bi-directional Reset Pin Interfacing 5 IMP809, IMP81 0 Package Dimensions Plastic SOT-23 (3-Pin) Inches Min B E H e S D a A A 0.031 0.050 0.80 1.27 A1 0.004 0.010 0.10 0.25 B 0.015 0.020 0.37 0.51 C 0.003 0.007 0.085 0.18 D 0.110 0.120 2.80 3.04 E 0.047 0.055 1.20 1.40 e 0.035 0.040 0.89 1.03 e1 0.070 0.080 1.78 2.05 H 0.083 0.1039 2.10 2.64 L S A1 e1 C L SOT-23 (3-Pin).eps 6 Millimeters Max Min Max Plastic SOT-23 (3-Pin) 0.027 REF 0.018 0.024 0.069 REF 0.45 0.60 IMP809, IMP810 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. © 1998 IMP, Inc. Printed in USA Preliminary Part No.: IMP809-810 Document Number: IMP809-6-6/98 7