October 2003 rev 1.0
ASM809, ASM810
3 Pin Microcontroller Power Supply Supervisor
General Description
The ASM809/ASM810 are cost effective 3.0V, 3.3V and 5.0V power supply supervisor circuits optimized for low-power microprocessor (µP), microcontroller (µC) and digital systems. They provide a reset output during power-up, power-down and brown-out conditions. They provide excellent reliability by eliminating external components and adjustments. The ASM809/810 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 ASM809 has an active-low RESET output that is guaranteed to be in the correct logic state for VCC down to 1.1V. The ASM810 has an active-high RESET output. The reset comparator is designed to ignore fast transients on VCC. Low supply current makes the ASM809/ASM810 ideal for use in portable and battery operated equipment. The ASM809/ASM810 are available in a compact, industry standard 3-pin SOT23 package.
Six voltage thresholds are available to support 3V to 5V systems: RESET THRESHOLD Suffix L M J T S R Voltage 4.63 4.38 4.00 3.08 2.93 2.63
Features:
• • • • • • Monitor 5V, 3.3V and 3V supplies 140ms min. reset pulse width Active-low reset valid with 1.1V supply (ASM809) Small 3-pin SOT-23 package No external components Specified over full temperature range - -40°C to 105°C
Applications
• • • • • • Embedded controllers Portable/Battery operated systems Intelligent instruments Wireless communication systems PDAs and handheld equipment Computers
Typical Operating Circuit
VCC
VCC VCC µP RESET (RESET) GND RESET (RESET) Input GND
Alliance Semiconductor 2575 Augustine Drive . Santa Clara, CA 95054 . Tel: 408.855.4900 . Fax: 408.855.4999 . www.alsc.com
Notice: The information in this document is subject to change without notice
October 2003 rev 1.0
ASM809, ASM810
Block Diagram
SOT23 GND
1
Pin Diagram
VCC
ASM809 (ASM810)
3 VCC
+ + -
RESET Generator
4.63V 4.38V 4.00V 3.08V 2.93V 2.63V
RESET (RESET)
(RESET) RESET
2
ASM809 (ASM810)
GND
Pin Description
Pin # ASM809 1 2 ASM810 Pin Name GND RESET Ground. RESET is asserted LOW if VCC falls below VTH and remains LOW for TRST after VCC exceeds the threshold. RESET is asserted HIGH if VCC falls below VTH and remains HIGH for TRST after VCC exceeds the threshold. Power supply input voltage (3.0V, 3.3V, 5.0V).
Function
3
2 -
RESET VCC
Detailed Description
A proper reset input enables a microprocessor /
VCC 5V 0V
VTH
microcontroller to start in a known state. ASM809/810 assert reset to prevent code execution errors during power-up, power-down and brown-out conditions.
RESET
Reset Timing The reset signal is asserted- LOW for the ASM809 and HIGH for the ASM810- when the VCC supply voltage falls below the threshold trip voltage and remains asserted for 140ms minimum after the VCC has risen above the threshold.
RESET
5V 0V 5V 0V
TRST
ASM809
ASM810
Figure 1: Reset TIming Diagram
3 Pin Microcontroller Power Supply Supervisor
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Bidirectional Reset Pin Interfacing The ASM809/810 can interface with µP / µC bi-directional reset pins by connecting a 4.7kΩ resistor in series with the ASM809/810 reset output and the µP/µC bi-directional reset pin.
Application Information
Negative VCC Transients The ASM809/810 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 When VCC is under 1.1V, to ensure logic inputs connected to the ASM809 RESET pin are in a known state, a 100kΩ pulldown resistor is needed at RESET . The value of the resistor is not critical. A 100kΩ pull-up resistor to VCC at RESET is needed with the ASM810.
BUF
Buffered RESET
VCC
Power supply
ASM809
4.7kΩ RESET
µC or µP RESET Input GND
VCC
GND
Power Supply
ASM809
RESET GND 100kΩ
Bi-directional I/O Pin
Figure 4: Bidirectional Reset Pin Interfacing
Figure 2: RESET valid with VCC under 1.1V
VCC 100kΩ Power Supply
ASM810
RESET GND
Figure 3: RESET valid with VCC under 1.1V
3 Pin Microcontroller Power Supply Supervisor
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Absolute Maximum Ratings Table 1:
Parameter Pin Terminal Voltage With Respect To Ground VCC RESET, RESET Input current at VCC Output current: RESET, RESET Rate of Rise at VCC
Min
Max
Units
-0.3 -0.3
6.0 VCC + 0.3 20 20 100
V V mA mA V/µs
Note: These are stress ratings only and the functional operation is not implied. Exposure to absolute maximum ratings for prolonged time periods may affect device reliability.
Absolute Maximum Ratings Table 2:
Parameter Power Dissipation (TA = 70°C) Operating temperature range Storage temperature range Lead temperature (Soldering, 10 sec)
Min
Max 320
Units uW °C °C °C
-40 -65
105 160 300
Note: These are stress ratings only and the functional operation is not implied. Exposure to absolute maximum ratings for prolonged time periods may affect device reliability.
3 Pin Microcontroller Power Supply Supervisor
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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.
Symbol VCC
Parameter Input Voltage Range TA = 0°C to 70°C
Conditions
Min 1.1 1.2
Typ
Max 5.5 5.5
Unit V V
TA = -40°C to 105°C TA= -40°C to 85°C 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 L devices TA = -40°C to 85°C TA = 85°C to 105°C TA = 25°C M devices TA = -40°C to 85°C TA = 85°C to 105°C TA = 25°C J devices TA = -40°C to 85°C TA = 85°C to 105°C TA = 25°C T devices TA = -40°C to 85°C TA = 85°C to 105°C TA = 25°C S devices TA = -40°C to 85°C TA = 85°C to 105°C TA = 25°C R devices TA = -40°C to 85°C TA = 85°C to 105°C TA = -40°C to 85°C TA = 85°C to 105°C TA = 85°C to 105°C
ICC
Supply Current
9 6.8
15 10 25 20 4.70 4.75 4.86 4.45 4.50 4.56 4.06 4.10 4.20
µA
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
4.38
4.00
VTH
Reset Threshold
V 3.08 3.11 3.15 3.23 2.96 3.00 3.08 2.66 2.70 2.76 ppm/°C µs
2.93
2.63
Reset Threshold Temp Coefficient VCC to Reset Delay VCC = VTH to VTH-100mV
30 60
Notes: 1. Production testing done at TA = 25°C. Over-temperature specifications guaranteed by design only, using six sigma design limits. 2. RESET output is active LOW for the ASM809 and RESET output is active HIGH for the ASM810.
3 Pin Microcontroller Power Supply Supervisor
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Symbol Parameter Conditions TA = -40°C to 85°C Reset Active Timeout Period TA = 85°C to 105°C VCC= VTH min., ISINK = 1.2mA, ASM809R/S/T VOL Low RESET Output Voltage (ASM809) VCC= VTH min., ISINK = 3.2mA, ASM809L/M/J VCC > 1.1V, ISINK = 50µA VCC > VTH max., ISOURCE = 500µA, ASM809R/ S/T VCC > VTH max., ISOURCE = 800µA, ASM809L/ M/J VOL Low RESET Output Voltage (ASM810) VCC= VTH max., ISINK = 1.2mA, ASM810R/S/T VCC= VTH max., ISINK = 3.2mA, ASM810L/M/J VOH High RESET Output Voltage (ASM810) Active Reset Timeout Period 1.8V < VCC < VTH min., ISOURCE = 150µA 0.8VCC 0.8VCC Min 140 100
ASM809, ASM810
Typ
Max 560
Unit
240
840 0.3 0.4 0.3
ms
V
VOH
High RESET Output Voltage (ASM809)
V VCC - 1.5
0.3 0.4
V V V
TRST
VCC > VTH
140
240
msec
Notes: 1. Production testing done at TA = 25°C. Over-temperature specifications guaranteed by design only, using six sigma design limits. 2. RESET output is active LOW for the ASM809 and RESET output is active HIGH for the ASM810.
3 Pin Microcontroller Power Supply Supervisor
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Typical Operating 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.
Supply Current vs Tem perature 10 Supply Current (µA) 8 6 4 2 0 -40 -20 0 20 40 60 80 100 125
ASM809R ASM809T
Tem perature (°C)
Norm alised Threshold vs Tem perature
ASM809T
1.04 Normalised Reset Threshold 1.02 1 0.98 0.96 0.94 0.92 -40 -20
ASM809R
0
20
40
60
80
100
125
Tem perature (°C)
Reset Tim eout Period vs Tem perature 350 300 250 200 150 100
ASM809R
Reset Timeout Period (ms)
ASM809T
50 0 -40
-20
0
20
40
60
80
100
125
Tem perature (°C)
3 Pin Microcontroller Power Supply Supervisor
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Package Dimensions
Inches
Millimeters
Min
Max
Min
Max
B
Plastic SOT-23 (3-Pin)
A A1 B C D E e e1 H L S 0.031 0.004 0.015 0.003 0.110 0.047 0.035 0.070 0.083 0.050 0.010 0.020 0.007 0.120 0.055 0.040 0.080 0.103 9 0.80 0.10 0.37 0.085 2.80 1.20 0.89 1.78 2.10 1.27 0.25 0.51 0.18 3.04 1.40 1.03 2.05 2.64
A1 A S D
E
H
e
a e1 C L
0.027 REF 0.018 0.024
0.069 REF 0.45 0.60
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Ordering Information:
Part Number 1
Reset Threshold (V)
Temperature Range
Pin-Package
Package Marking (XX Lot Code)
ASM809 ACTIVE LOW RESET ASM809LEUR-T ASM809MEUR-T ASM809JEUR-T ASM809TEUR-T ASM809SEUR-T ASM809REUR-T 4.63 4.38 4.00 3.08 2.93 2.63 -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 ASM810 ACTIVE HIGH RESET ASM810LEUR-T ASM810MEUR-T ASM810JEUR-T ASM810TEUR-T ASM810SEUR-T ASM810REUR-T 4.63 4.38 4.00 3.08 2.93 2.63 -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 3-SOT23 3-SOT23 3-SOT23 3-SOT23 3-SOT23 3-SOT23 SGXX SHXX SIXX SJXX SKXX SLXX 3-SOT23 3-SOT23 3-SOT23 3-SOT23 3-SOT23 3-SOT23 SAXX SBXX SCXX SDXX SEXX SFXX
Notes: 1. Tape and Reel packaging is indicated by the -T designation.
Related Products:
ASM809 Max Supply Current Package Pins Manual RESET input Package Type Active-HIGH RESET Output Active-LOW RESET Output SOT-23 15µA 3
ASM810 15µA 3
ASM811 15µA 4
ASM812 15µA 4
SOT-23
SOT-143
SOT-143
3 Pin Microcontroller Power Supply Supervisor
Notice: The information in this document is subject to change without notice
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Alliance Semiconductor Corporation 2575, Augustine Drive, Santa Clara, CA 95054 Tel: 408 - 855 - 4900 Fax: 408 - 855 - 4999 www.alsc.com
Copyright © Alliance Semiconductor All Rights Reserved Part Number: ASM809, ASM810 Document Version: v 1.0
© Copyright 2003 Alliance Semiconductor Corporation. All rights reserved. Our three-point logo, our name and Intelliwatt are trademarks or registered trademarks of Alliance. All other brand and product names may be the trademarks of their respective companies. Alliance reserves the right to make changes to this document and its products at any time without notice. Alliance assumes no responsibility for any errors that may appear in this document. The data contained herein represents Alliance's best data and/or estimates at the time of issuance. Alliance reserves the right to change or correct this data at any time, without notice. If the product described herein is under development, significant changes to these specifications are possible. The information in this product data sheet is intended to be general descriptive information for potential customers and users, and is not intended to operate as, or provide, any guarantee or warrantee to any user or customer. Alliance does not assume any responsibility or liability arising out of the application or use of any product described herein, and disclaims any express or implied warranties related to the sale and/or use of Alliance products including liability or warranties related to fitness for a particular purpose, merchantability, or infringement of any intellectual property rights, except as express agreed to in Alliance's Terms and Conditions of Sale (which are available from Alliance). All sales of Alliance products are made exclusively according to Alliance's Terms and Conditions of Sale. The purchase of products from Alliance does not convey a license under any patent rights, copyrights; mask works rights, trademarks, or any other intellectual property rights of Alliance or third parties. Alliance does not authorize its products for use as critical components in life-supporting systems where a malfunction or failure may reasonably be expected to result in significant injury to the user, and the inclusion of Alliance products in such life-supporting systems implies that the manufacturer assumes all risk of such use and agrees to indemnify Alliance against all claims arising from such use.