Key Features
Applications
3-Pin Microcontroller Power Supply Supervisor英语歌曲下载
N Embedded controllers N Battery operated systems N Intelligent instruments
N Wireless communication systems N
PDAs and handheld equipment
N Improved Maxim MAX809/MAX810 replacement —Lower supply current…6µA
—80% lower maximum supply current N Monitor 5V , 3.3V and 3V supplies N 140ms min. ret pul width
N Active-low ret valid with 1.1V supply (IMP809)N Small 3-pin SOT-23 package N No external components
N Specified over full temperature range –40°C to 105°C
Block Diagrams
V CC
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The IMP809/IMP810 are 3.0V , 3.3V and 5.0V power supply supervisor cir-cuits 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 ret signal is issued if the power supply voltage drops below a pret ret threshold and is asrted for at least 140ms after the supply has rin above the ret threshold. The IMP809 has an active-low RESET output that is guaranteed to be in the correct state for V CC down to 1.1V .The IMP810 has an active-high RESET output. The ret comparator is designed to ignore fast transients on V CC .
Low supply current makes the IMP809/IMP810 ideal for u 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:
Ret Threshold SuffixVoltage (V)
L 4.63M 4.38J 4.00T 3.08S 2.93R
2.63
Ordering Information
Pin Configuration
IMP809(IMP810)
GND (RESET) RESET V CC
31
2
809/10_02.eps
SOT23
Package Marking 2Part Number 1Ret Threshold (V)Temperature Range
Pin-Package
redo
(XXX Lot Code)
IMP809 Active LOW Ret
IMP809LEUR /T 4.63 –40°C to +105°C 3-SOT23 AAXXX IMP809MEUR /T 4.38 –40°C to +105°C 3-SOT23 ABXXX IMP809JEUR /T 4.00 –40°C to +105°C 3-SOT23 CWXXX IMP809TEUR /T 3.08 –40°C to +105°C 3-SOT23 ACXXX IMP809SEUR /T 2.93 –40°C to +105°C 3-SOT23 ADXXX IMP809REUR /T 2.63 –40°C to +105°C 3-SOT23 AFXXX
IMP810 Active HIGH Ret
IMP810LEUR /T 4.63 –40°C to +105°C 3-SOT23 AGXXX IMP810MEUR /T 4.38 –40°C to +105°C 3-SOT23 AHXXX IMP810JEUR /T 4.00 –40°C to +105°C 3-SOT23 AIXXX IMP810TEUR /T 3.08 –40°C to +105°C 3-SOT23 AJXXX IMP810SEUR /T 2.93 –40°C to +105°C 3-SOT23 AKXXX IMP810REUR /T 2.63 –40°C to +105°C 3-SOT23 ALXXX
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. XXX refers to lot.
Related Products
美国佛罗里达大学IMP809
IMP810
IMP811
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Max. Supply Current 15µA 15µA 15µA 15µA Package Pins
3344Manual RESET input I I Package Type
SOT-23SOT-23SOT-143
SOT-143
Active-HIGH RESET output I
I
Active-LOW RESET output
I
I
Absolute Maximum Ratings
Pin Terminal Voltage with Respect to Ground
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Pin Descriptions
宾客
Pin Number
Name
Function
1GND Ground
leyo>恩泽的意思2 RESET RESET is asrted LOW if V CC falls below the ret threshold and remains LOW for the (IMP809)240ms typical ret timeout period (140ms minimum) after V CC exceeds the threshold.2 RESET RESET is asrted HIGH if V CC falls below the ret threshold and remains HIGH for the (IMP810)
240ms typical ret timeout period (140ms minimum) after V CC exceeds the threshold. 3
V CC
Power supply input voltage (3.0V, 3.3V, 5.0V)
809/10_03.eps
it is amazingDetailed Descriptions
Figure 1. Ret Timing Diagram
Bi-directional Ret Pin Interfacing
too badThe IMP809/810 can interface with µP/µC bi-directional ret pins by connecting a 4.7k Ωresistor in ries with the
IMP809/810 ret output and the µP/µC bi-directional ret pin.
Negative V CC Transients
The IMP809/810 protect µPs from brownouts and low V CC . Short duration transients of 100mV amplitude and 20µs or less duration typically do not cau a fal RESET.
pull-up Application Information
CC CC Figure 4. Bi-directional Ret Pin Interfacing
