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IMP809, IMP8 1 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 (P), microcontroller (C) 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
N Improved Maxim MAX809/MAX810 replacement -- Lower supply current...6A -- 80% lower maximum supply current N Monitor 5V, 3.3V and 3V supplies N 140ms min. reset pulse width N Active-low reset valid with 1.1V supply (IMP809) N Small 3-pin SOT-23 package N No external components N Specified over full temperature range -- - 40C to 105C
Applications
N N N N N 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 P
GND
809/10_01.eps
(c) 1999 IMP, Inc.
408-432-9100/www.impweb.com
1
IMP809, IMP8 1 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
- 40C to +105C - 40C to +105C - 40C to +105C - 40C to +105C - 40C to +105C - 40C to +105C - 40C to +105C - 40C to +105C - 40C to +105C - 40C to +105C - 40C to +105C - 40C to +105C
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
15A 3 SOT-23 I
IMP811
15A 4 I SOT-143 I
IMP812
15A 4 I SOT-143 I
15A 3 SOT-23 I
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(c) 1999 IMP, Inc.
IMP809, IMP8 1 0
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/s These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for prolonged time periods may affect device reliability Power Dissipation (TA = 70C) . . . . . . . . . . 320mW (Derate 4mW/C above 70C) Operating Temperature Range . . . . . . . . . . -40C to 105C Storage Temperature Range . . . . . . . . . . . . . -65C to 160C Lead Temperature (soldering, 10 sec) . . . . . 300C
Electrical Characteristics
Unless otherwise noted VCC is over the full voltage range, TA = -40C to 105C. Typical values at TA = 25C, VCC = 5V for L/M/J devices, VCC = 3.3V for T/S devices and VCC = 3V for R devices.
Parameter
Input Voltage (VCC) Range Supply Current
Symbol Conditions
VCC ICC TA = 0C to 70C TA = - 40C to 105C TA = - 40C to 85C TA = - 40C to 85C TA = 85C to 105C TA = 85C to 105C L devices 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 = 25C TA = - 40C to 85C TA = 85C to 105C TA = 25C TA = - 40C to 85C TA = 85C to 105C TA = 25C TA = - 40C to 85C TA = 85C to 105C TA = 25C TA = - 40C to 85C TA = 85C to 105C TA = 25C TA = - 40C to 85C TA = 85C to 105C TA = 25C TA = - 40C to 85C TA = 85C to 105C
Min
1.1 1.2
Typ
9 6
Max
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
Units
V A
Reset Threshold
VTH
M devices
J devices
T devices
S devices
R devices
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
4.63
V
4.38
4.00
3.08
2.93
2.63
Reset Threshold Stability VCC to Reset Delay Reset Active Timeout Period Low RESET Output Voltage (IMP809) VOL
High RESET Output Voltage (IMP809) Low RESET Output Voltage (IMP810) High RESET Output Voltage (IMP810) Notes:
VOH VOL VOH
VCC = VTH to VTH - 100mV TA = - 40C to 85C 140 TA = 85C to 105C 100 VCC = VTH min., ISINK = 1.2mA, IMP809R/S/T VCC = VTH min., ISINK = 3.2mA, IMP809L/M/J VCC > 1.1V, ISINK = 50A VCC > VTH max., ISOURCE = 500A, IMP809R/S/T 0.8VCC VCC > VTH max., ISOURCE = 800A, 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 = 150A 0.8VCC
30 20 240
560 840 0.3 0.4 0.3
ppm/C s ms V
V 0.3 0.4 V V
1. Production testing done at TA = 25C. Over-temperature specifications guaranteed by design only. 2. RESET output is active LOW for the IMP809 and RESET output is active HIGH for the IMP810
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(c) 1999 IMP, Inc.
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IMP809, IMP8 1 0
Pin Descriptions
Pin Number
1 2 (IMP809) 2 (IMP810) 3
Name
GND RESET RESET VCC
Function
Ground 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. 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. 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 0V
VTH Active Reset Timeout Period 140ms minimum IMP809
5V RESET 0V 5V RESET 0V
IMP810
809/10_03.eps
Figure 1. Reset Timing Diagram
4
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(c) 1999 IMP, Inc.
IMP809, IMP8 1 0
Application Information
Negative VCC Transients
The IMP809/810 protect Ps from brownouts and low VCC. Short duration transients of 100mV amplitude and 20s 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 100k 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 100k
Power Supply
IMP809
RESET GND 100k
Power Supply
IMP810
RESET GND
809/10_04.eps
809/10_05.eps
Figure 2. RESET Valid with VCC Under 1.1V
Figure 3. RESET Valid with VCC Under 1.1V
Bi-directional Reset Pin Interfacing
The IMP809/810 can interface with P/C bi-directional reset pins by connecting a 4.7k resistor in series with the IMP809/810 reset output and the P/C bi-directional reset pin.
BUF Buffered RESET
VCC
Power Supply
IMP809
4.7kW RESET GND
Bi-directional I/O Pin (Example: 68HC11)
mC or mP
RESET Input GND
809/10_06.eps
Figure 4. Bi-directional Reset Pin Interfacing
(c) 1999 IMP, Inc.
408-432-9100/www.impweb.com
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IMP809, IMP8 1 0
Package Dimensions
Plastic SOT-23 (3-Pin)
B
Inches Min
A 0.031 0.004 0.015 0.003 0.110 0.047 0.035 0.070 0.083 0.018
Millimeters Max Min Max Plastic SOT-23 (3-Pin)
0.050 0.010 0.020 0.007 0.120 0.055 0.040 0.080 0.1039 0.024 0.80 0.10 0.37 0.085 2.80 1.20 0.89 1.78 2.10 0.069 REF 0.45 0.60 1.27 0.25 0.51 0.18 3.04 1.40 1.03 2.05 2.64
E
H
A1 B C D
S D
e
E e e1
a
A
H L S
0.027 REF
A1
e1
C
L
SOT-23 (3-Pin).eps
6
408-432-9100/www.impweb.com
(c) 1999 IMP, Inc.
IMP809, IMP8 1 0
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: 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.
(c) 1999 IMP, Inc. Printed in USA Publication #: 1018 Revision: A Issue Date: 08/17/99 Type: Preliminary

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