ALSC ASM810REUR-T 3 pin microcontroller power supply supervisor Datasheet

ASM809, ASM810
October 2003
rev 1.0
3 Pin Microcontroller Power Supply Supervisor
General Description
Six voltage thresholds are available to support 3V to 5V
systems:
The ASM809/ASM810 are cost effective 3.0V, 3.3V and 5.0V
RESET THRESHOLD
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
Suffix
Voltage
L
4.63
M
4.38
J
4.00
T
3.08
S
2.93
R
2.63
Features:
active-high RESET output. The reset comparator is designed to
•
Monitor 5V, 3.3V and 3V supplies
•
140ms min. reset pulse width
Low supply current makes the ASM809/ASM810 ideal for use
•
Active-low reset valid with 1.1V supply (ASM809)
in
The
•
Small 3-pin SOT-23 package
ASM809/ASM810 are available in a compact, industry standard
•
No external components
3-pin SOT23 package.
•
Specified over full temperature range - -40°C to 105°C
Applications
Typical Operating Circuit
ignore fast transients on VCC.
portable
and
battery
operated
•
Embedded controllers
•
Portable/Battery operated systems
•
Intelligent instruments
•
Wireless communication systems
•
PDAs and handheld equipment
•
Computers
equipment.
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
ASM809, ASM810
October 2003
rev 1.0
Pin Diagram
Block Diagram
SOT23
GND
+
-
VCC
1
ASM809
(ASM810)
+
-
3 VCC
2
(RESET) RESET
RESET Generator
4.63V
4.38V
4.00V
3.08V
2.93V
2.63V
RESET
(RESET)
ASM809
(ASM810)
GND
Pin Description
Pin #
Pin
Name
ASM809
ASM810
1
-
GND
-
RESET
-
2
RESET
3
-
VCC
2
Function
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).
Detailed Description
A
proper
reset
input
enables
a
microprocessor
/
VCC
microcontroller to start in a known state. ASM809/810 assert
5V
VTH
0V
reset to prevent code execution errors during power-up,
power-down and brown-out conditions.
RESET
5V
0V
RESET
5V
0V
Reset Timing
The reset signal is asserted- LOW for the ASM809 and HIGH
TRST
ASM809
ASM810
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.
Figure 1: Reset TIming Diagram
3 Pin Microcontroller Power Supply Supervisor
Notice: The information in this document is subject to change without notice
2 of 10
ASM809, ASM810
October 2003
rev 1.0
Application Information
Bidirectional Reset Pin Interfacing
The ASM809/810 can interface with µP / µC bi-directional
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.
reset pins by connecting a 4.7kΩ resistor in series with the
ASM809/810 reset output and the µP/µC bi-directional reset
pin.
Valid Reset with VCC under 1.1V
BUF
Buffered
RESET
When VCC is under 1.1V, to ensure logic inputs connected to
the ASM809 RESET pin are in a known state, a 100kΩ pull-
VCC
down 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.
Power supply
ASM809
RESET
VCC
Power Supply
µC or µP
4.7kΩ
RESET
Input
GND
Bi-directional I/O Pin
ASM809
Figure 4: Bidirectional Reset Pin Interfacing
RESET
GND
GND
100kΩ
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
Notice: The information in this document is subject to change without notice
3 of 10
ASM809, ASM810
October 2003
rev 1.0
Absolute Maximum Ratings Table 1:
Parameter
Min
Max
Units
VCC
-0.3
6.0
V
RESET, RESET
-0.3
VCC + 0.3
V
Input current at VCC
20
mA
Output current: RESET, RESET
20
mA
Rate of Rise at VCC
100
V/µs
Pin Terminal Voltage With Respect To Ground
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
Min
Power Dissipation (TA = 70°C)
Max
Units
320
uW
Operating temperature range
-40
105
°C
Storage temperature range
-65
160
°C
300
°C
Lead temperature (Soldering, 10 sec)
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
Notice: The information in this document is subject to change without notice
4 of 10
ASM809, ASM810
October 2003
rev 1.0
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
ICC
Parameter
Input Voltage
Range
Supply Current
Conditions
TA = 0°C to 70°C
TA= -40°C to 85°C
VCC < 5.5V, L/M/J
TA = -40°C to 85°C
VCC < 3.6V, R/S/T
TA = 85°C to 105°C
VCC < 5.5V, L/M/J
TA = 85°C to 105°C
VCC < 3.6V, R/S/T
TA = 25°C
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
VTH
TA = -40°C to 85°C
TA = 85°C to 105°C
Reset Threshold
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
Reset Threshold
Temp Coefficient
VCC to Reset
Delay
Typ
1.1
1.2
TA = -40°C to 105°C
L devices
Min
VCC = VTH to VTH-100mV
9
6.8
Max
Unit
5.5
5.5
V
V
15
10
25
20
µA
4.56
4.50
4.40
4.63
4.70
4.75
4.86
4.31
4.25
4.16
4.38
4.45
4.50
4.56
3.93
3.89
3.80
4.00
4.06
4.10
4.20
3.04
3.00
2.92
3.08
3.11
3.15
3.23
2.89
2.85
2.78
2.93
2.96
3.00
3.08
2.59
2.55
2.50
2.63
2.66
2.70
2.76
V
30
ppm/°C
60
µs
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
Notice: The information in this document is subject to change without notice
5 of 10
ASM809, ASM810
October 2003
rev 1.0
Symbol
Parameter
Reset Active
Timeout Period
VOL
VOH
Low RESET
Output Voltage
(ASM809)
High RESET
Output Voltage
(ASM809)
Conditions
TA = -40°C to 85°C
140
TA = 85°C to 105°C
100
Low RESET
Output Voltage
(ASM810)
Typ
Max
240
840
0.3
VCC= VTH min., ISINK = 3.2mA, ASM809L/M/J
0.4
VCC > 1.1V, ISINK = 50µA
0.3
VCC > VTH max., ISOURCE = 500µA, ASM809R/
S/T
VCC > VTH max., ISOURCE = 800µA, ASM809L/
Unit
560
VCC= VTH min., ISINK = 1.2mA, ASM809R/S/T
M/J
VOL
Min
ms
V
0.8VCC
V
VCC - 1.5
VCC= VTH max., ISINK = 1.2mA, ASM810R/S/T
0.3
V
VCC= VTH max., ISINK = 3.2mA, ASM810L/M/J
0.4
V
VOH
High RESET
Output Voltage
(ASM810)
1.8V < VCC < VTH min., ISOURCE = 150µA
TRST
Active Reset
Timeout Period
VCC > VTH
0.8VCC
140
V
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
Notice: The information in this document is subject to change without notice
6 of 10
ASM809, ASM810
October 2003
rev 1.0
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
ASM809T
Supply Current (µA)
10
8
6
ASM809R
4
2
0
-40
-20
0
20
40
60
80
100
125
Tem perature (°C)
Norm alised Threshold vs Tem perature
ASM809T
Normalised Reset
Threshold
1.04
1.02
1
0.98
0.96
ASM809R
0.94
0.92
-40
-20
0
20
40
60
80
100
125
Tem perature (°C)
Reset Timeout Period
(ms)
Reset Tim eout Period vs Tem perature
ASM809R
350
300
250
200
150
100
ASM809T
50
0
-40
-20
0
20
40
60
80
100
125
Tem perature (°C)
3 Pin Microcontroller Power Supply Supervisor
Notice: The information in this document is subject to change without notice
7 of 10
ASM809, ASM810
October 2003
rev 1.0
Package Dimensions
Inches
Min
Max
Millimeters
Min
Max
Plastic SOT-23 (3-Pin)
B
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
0.103
9
2.10
2.64
L
S
0.027 REF
0.018
0.024
E
H
e
S
D
A
a
A1
e1
C
L
0.069 REF
0.45
0.60
3 Pin Microcontroller Power Supply Supervisor
Notice: The information in this document is subject to change without notice
8 of 10
ASM809, ASM810
October 2003
rev 1.0
Ordering Information:
Part Number 1
Reset Threshold (V)
Temperature Range
Pin-Package
Package Marking
(XX Lot Code)
ASM809 ACTIVE LOW RESET
ASM809LEUR-T
4.63
-40°C to +105°C
3-SOT23
SAXX
ASM809MEUR-T
4.38
-40°C to +105°C
3-SOT23
SBXX
ASM809JEUR-T
4.00
-40°C to +105°C
3-SOT23
SCXX
ASM809TEUR-T
3.08
-40°C to +105°C
3-SOT23
SDXX
ASM809SEUR-T
2.93
-40°C to +105°C
3-SOT23
SEXX
ASM809REUR-T
2.63
-40°C to +105°C
3-SOT23
SFXX
ASM810 ACTIVE HIGH RESET
ASM810LEUR-T
4.63
-40°C to +105°C
3-SOT23
SGXX
ASM810MEUR-T
4.38
-40°C to +105°C
3-SOT23
SHXX
ASM810JEUR-T
4.00
-40°C to +105°C
3-SOT23
SIXX
ASM810TEUR-T
3.08
-40°C to +105°C
3-SOT23
SJXX
ASM810SEUR-T
2.93
-40°C to +105°C
3-SOT23
SKXX
ASM810REUR-T
2.63
-40°C to +105°C
3-SOT23
SLXX
Notes:
1. Tape and Reel packaging is indicated by the -T designation.
Related Products:
Max Supply Current
Package Pins
ASM809
ASM810
ASM811
ASM812
15µA
15µA
15µA
15µA
3
3
4
4
„
„
SOT-143
SOT-143
Manual RESET input
Package Type
SOT-23
Active-HIGH RESET Output
Active-LOW RESET Output
SOT-23
„
„
„
„
3 Pin Microcontroller Power Supply Supervisor
Notice: The information in this document is subject to change without notice
9 of 10
ASM809, ASM810
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
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