Document
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. Six voltage thresholds are available to support 3V to 5V systems:
Key Features
x Improved Maxim MAX809/MAX810 replacement — Lower supply current…6µA — 80% lower maximum supply current x Monitor 5V, 3.3V and 3V supplies x 140ms min. reset pulse width x Active-low reset valid with 1.1V supply (IMP809) x Small 3-pin SOT-23 package x No external components x Specified over full temperature range — – 40°C to 105°C
Applications
x x x x x Embedded controllers Battery operated systems Intelligent instruments Wireless communication systems PDAs and handheld equipment
Reset Threshold Suffix Voltage (V)
L M J T S R 4.63 4.38 4.00 3.08 2.93 2.63
Block Diagrams
VCC VCC
IMP809 (IMP810)
RESET (RESET) GND RESET Input
VCC µP
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
IMP809LEUR-T IMP809MEUR-T IMP809JEUR-T IMP809TEUR-T IMP809SEUR-T IMP809REUR-T 4.63 4.38 4.00 3.08 2.93 2.63 4.63 4.38 4.00 3.08 2.93 2.63
Temperature Range
– 40°C to +105°C – 40°C to +105°C – 40°C to +105°C – 40°C to +105°C – 40°C to +105°C – 40°C to +105°C – 40°C to +105°C – 40°C to +105°C – 40°C to +105°C – 40°C to +105°C – 40°C to +105°C – 40°C to +105°C
Pin-Package
3-SOT23 3-SOT23 3-SOT23 3-SOT23 3-SOT23 3-SOT23 3-SOT23 3-SOT23 3-SOT23 3-SOT23 3-SOT23 3-SOT23
Package Marking2 (XX Lot Code)
AAXX ABXX CWXX ACXX ADXX AFXX AGXX AHXX AIXX AJXX AKXX ALXX
IMP810 Active HIGH Reset
IMP810LEUR-T IMP810MEUR-T IMP810JEUR-T IMP810TEUR-T IMP810SEUR-T IMP810REUR-T
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
IMP809
Max. Supply Current Package Pins Manual RESET input Package Type Active-HIGH RESET output Active-LOW RESET output
2
IMP810
15µA 3 SOT-23 s
IMP811
15µA 4 s SOT-143 s
IMP812
15µA 4 s SOT-143 s
15µA 3 SOT-23 s
IMP809, IMP810
Absolute Maximum Ratin.