ONSEMI ASM811TEUSF

ASM811, ASM812
April 2005
rev 1.5
4-Pin µP Voltage Supervisor with Manual Reset
General Description
Six voltage thresholds are available to support 3V to 5V
systems:
The ASM811/ASM812 are cost effective low power supervisors
RESET THRESHOLD
designed to monitor voltage levels of 3.0V, 3.3V and 5.0V
power
supplies
in
low-power
microprocessor
(µP),
Suffix
Voltage (V)
L
4.63
M
4.38
A reset signal is issued if the power supply voltage drops below
J
4.00
a preset reset threshold and is asserted for at least 140ms after
T
3.08
the supply has risen above the reset threshold. The ASM811
S
2.93
has an active-low output RESET that is guaranteed to be in the
R
2.63
microcontroller (µC) and digital systems. They provide excellent
reliability by eliminating external components and adjustments.
correct state for VCC down to 1.1V. The ASM812 has an activehigh RESET output. The reset comparator is designed to ignore
fast transients on VCC. A debounced manual reset input allows
the user to manually reset the systems to bring them out of
locked state.
Low power consumption makes the ASM811/ASM812 ideal for
use in portable and battery operated equipment. The ASM811/
ASM812 are available in a compact 4-pin SOT-143 package
and thus use minimal board space.
Applications
Features
•
New 4.0V threshold option
•
6µA supply current
•
Monitor 5V, 3.3V and 3V supplies
•
Manual reset input
•
140ms min. reset pulse width
•
Guaranteed over temperature
•
Active-low reset valid with 1.1V supply (ASM811)
•
Small 4-pin SOT-143 package
•
No external components
•
Power-supply transient-immune design
Typical Operating Circuit
•
Computers and Controllers
•
Embedded controllers
•
Portable/Battery operated systems
•
Intelligent instruments
•
Wireless communication systems
•
PDAs and handheld equipments
•
Automotive systems
•
Safety Systems
VCC
VCC
ASM811
(ASM812)
VCC
µP
MR 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
ASM811, ASM812
April 2005
rev 1.5
Pin Diagram:
Block Diagram
SOT143
GND
VCC
4 VCC
1
20kΩ
MR
ASM811
(ASM812)
2
(RESET) RESET
VCC
3 MR
+
+
-
Pin Description
Pin #
ASM811 ASM812
RESET Generator
4.63V
4.38V
4.00V
4.38V
3.08V
2.93V
2.63V
RESET
(RESET)
ASM811
(ASM812)
GND
Pin
Name
GND
Function
1
1
Ground.
2
-
RESET once VCC exceeds the Threshold. In addition, RESET is active LOW as long as the manual reset
(MR) is low.
-
2
RESET once VCC exceeds the threshold. In addition, RESET is active HIGH as long as the manual reset
(MR) is low.
RESET is asserted LOW if VCC falls below VTH. RESET remains LOW for atleast 140ms (TRST)
RESET is asserted HIGH if VCC falls below VTH. RESET remains HIGH for atleast 140ms (TRST)
3
3
MR
4
4
VCC
Manual Reset Input. A logic LOW on MR asserts reset. Reset remains active as long as MR is
LOW and for atleast 180ms (TMRST) once MR returns HIGH. The active low input has an internal
20kΩ pull-up resistor. The input should be left open if not used. It can be driven by TTL or CMOS
logic or shorted to ground by a switch.
Power supply input voltage (3.0V, 3.3V, 5.0V)
Detailed Description
Manual Reset (MR) Input
A logic low on MR assserts RESET LOW on the ASM811 and
A
proper
reset
input
enables
a
microprocessor
/
microcontroller to start in a known state. ASM811/812 assert
reset to prevent code execution errors during power-up, powerdown and brown-out conditions.
RESET HIGH on the ASM812. MR is internally pulled high
through a 20kΩ resistor and can be driven by TTL/CMOS gates
or with open collector/drain outputs. MR can be left open if not
used. MR may be connected to ground through a normallyopen momentary switch without an external debounce circuit.
Reset Timing
The reset signal is asserted- LOW for the ASM811 and HIGH
for the ASM812- when the VCC supply voltage falls below the
threshold trip voltage and remains asserted for 140ms
A 0.1µF capacitor from MR to ground can be added for
additional noise immunity.
minimum after the VCC has risen above the threshold.
4-Pin µP Voltage Supervisor with Manual Reset
Notice: The information in this document is subject to change without notice
2 of 11
ASM811, ASM812
April 2005
rev 1.5
VTH
5V
VCC
VCC
VCC
0V
100kΩ
140ms Min.
TRST
MR
5V
0V
5V
RESET
0V
RESET
ASM811
Power Supply
MR
Active RESET Timeout Period
TMRST FOUT
Normal
ASM812
Power Supply
RESET
MR
RESET
100kΩ
GND
GND
ASM811
5V
0V
ASM812
Figure 1: Reset Timing and Manual Reset (MR)
Figures 2 & 3: RESET valid with VCC under 1.1V
Application Information
Reset Output Operation
In µP / µC systems it is important to have the processor and
Negative VCC Transients
the system begin operation from a known state. A reset
Typically short duration transients of 100mV amplitude and
output to a processor is provided to prevent improper
60µs duration do not cause a false RESET. A 0.1µF capacitor
operation during power supply sequencing or low voltage
at VCC increases transient immunity.
brown-out conditions.
Bidirectional Reset Pin Interfacing
The ASM811/812 are designed to monitor the system power
The ASM811/812 can interface with µP / µC bi-directional
supply voltages and issue a reset signal when the levels are
reset pins by connecting a 4.7kΩ resistor in series with the
out of range. RESET outputs are guaranteed to be active for
ASM811/812 reset output and the µP/µC bi-directional reset
VCC above 1.1V. When VCC exceeds the reset threshold, an
internal timer keeps RESET active for the reset timeout
input pin.
period, after which RESET becomes inactive (HIGH for the
BUF
ASM811 and LOW for the ASM812). If VCC drops below the
Buffered
RESET
reset threshold, RESET automatically becomes active.
Alternatively, external circuitry or an operator can initiate this
VCC
condition using the Manual Reset (MR) pin. MR can be left
open if it is not used. MR can be driven by TTL/CMOS logic
or even an external switch.
ASM811
Power supply
Valid Reset with VCC under 1.1V
To ensure logic inputs connected to the ASM811 RESET pin
µC or µP
4.7kΩ
MR
RESET
RESET
Input
GND
GND
are in a known state when VCC is under 1.1V, a 100kΩ pulldown resistor at RESET is needed. The value is not critical. A
100kΩ pull-up resistor to VCC at RESET is needed with the
ASM812.
Bi-directional I/O Pin
Figure 4: Bi-directional Reset Pin Interface
4-Pin µP Voltage Supervisor with Manual Reset
Notice: The information in this document is subject to change without notice
3 of 11
ASM811, ASM812
April 2005
rev 1.5
Absolute Maximum Ratings, Table 1:
Parameter
Min
Max
Units
VCC
-0.3
6.0
V
RESET, RESET and MR
-0.3
VCC + 0.3
V
Input current at VCC and MR
20
mA
Output current: RESET, RESET
20
mA
Rate of Rise at VCC
100
V/µs
2
200
KV
V
Pin Terminal Voltage With Respect To Ground
ESD rating
HBM
MM
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)
Derate SOT-143 4mW/°C above 70°C
Max
Units
320
mW
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.
4-Pin µP Voltage Supervisor with Manual Reset
Notice: The information in this document is subject to change without notice
4 of 11
ASM811, ASM812
April 2005
rev 1.5
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
VTH
TCVTH
Parameter
Input Voltage Range
Supply Current (Unloaded)
Conditions
Min
TA = 0°C to 70°C
TA = -40°C to 105°C
1.1
1.2
TA= -40°C to 85°C
TA = -40°C to 85°C
TA = 85°C to 105°C
TA = 85°C to 105°C
VCC <
VCC <
VCC <
VCC <
5.5V, L/M/J
3.6V, R/S/T
5.5V, L/M/J
3.6V, R/S/T
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
M devices
TA = 25°C
TA = -40°C to 85°C
TA = 85°C to 105°C
4.31
4.25
4.16
4.38
4.45
4.50
4.56
J devices
TA = 25°C
TA = -40°C to 85°C
TA = 85°C to 105°C
3.93
3.89
3.80
4.00
4.06
4.10
4.20
T devices
TA = 25°C
TA = -40°C to 85°C
TA = 85°C to 105°C
3.04
3.00
2.92
3.08
3.11
3.15
3.23
S devices
TA = 25°C
TA = -40°C to 85°C
TA = 85°C to 105°C
2.89
2.85
2.78
2.93
2.96
3.00
3.08
R devices
TA = 25°C
TA = -40°C to 85°C
TA = 85°C to 105°C
2.59
2.55
2.50
2.63
2.66
2.70
2.76
V
Reset Threshold Temp.
Coefficient
VCC = VTH to (VTH - 125mV),
Reset Active Timeout Period
TA = -40°C to 105°C
MR Minimum Pulse Width
MR Glitch Immunity
Unit
TA = 25°C
TA = -40°C to 85°C
TA = 85°C to 105°C
TA = 0°C to 70°C
tMR
6
5
Max
L devices
Reset Threshold
VCC to Reset Delay
TRST
Typ
30
ppm/°C
60
µs
140
100
560
240
840
10
Note 3
ms
µs
100
ns
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 ASM811 and RESET output is active HIGH for the ASM812.
3. Glitches of 100ns or less typically will not generate a reset pulse.
4-Pin µP Voltage Supervisor with Manual Reset
Notice: The information in this document is subject to change without notice
5 of 11
ASM811, ASM812
April 2005
rev 1.5
Symbol
tMD
VIH
Parameter
MR to RESET Propagation
Delay
VCC > VTH (MAX),
ASM811/812R/S/T
MR Input Threshold
VIL
MR Pullup Resistance
VOL
VOH
VOL
VOH
Low RESET Output Voltage
(ASM811)
High RESET Output Voltage
(ASM811)
Low RESET Output Voltage
(ASM812)
High RESET Output Voltage
(ASM812)
Min
Typ
Note 2
VCC > VTH (MAX),
ASM811/812L/M/J
MR Input Threshold
VIL
VIH
Conditions
Max
0.5
µs
2.3
V
0.8
0.7VCC
V
0.25VCC
10
20
30
VCC= VTH min., ISINK = 1.2mA,
ASM811R/S/T
0.3
VCC= VTH min., ISINK = 3.2mA,
ASM811L/M/J
0.4
VCC > 1.1V, ISINK = 50µA
0.3
VCC > VTH max., ISOURCE = 500µA,
ASM811R/S/T
Unit
kΩ
V
0.8VCC
V
VCC > VTH max., ISOURCE = 800µA,
ASM811L/M/J
VCC - 1.5
VCC= VTH max., ISINK = 1.2mA,
ASM812R/S/T
0.3
VCC= VTH max., ISINK = 3.2mA,
ASM812L/M/J
0.4
1.8V < VCC < VTH min., ISOURCE = 150µA
V
0.8VCC
V
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 ASM811 and RESET output is active HIGH for the ASM812.
3. Glitches of 100ns or less typically will not generate a reset pulse.
4-Pin µP Voltage Supervisor with Manual Reset
Notice: The information in this document is subject to change without notice
6 of 11
ASM811, ASM812
April 2005
rev 1.5
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. Temperature
Supply Current (µA)
ASM811T
ASM811R
Temperature (°C)
Power-up Reset Timeout Period (ms)
Normalized Reset Threshold
Normalized Reset Threshold Vs. Temperature
ASM811T
ASM811R
Temperature (°C)
Power-up Reset Timeout Period Vs. Temperature
ASM811T
ASM811R
Temperature (°C)
4-Pin µP Voltage Supervisor with Manual Reset
Notice: The information in this document is subject to change without notice
7 of 11
ASM811, ASM812
April 2005
rev 1.5
Package Dimensions:
Plastic SOT-143 (4-Pin)
Dimensions
Symbol
Inches
Millimeters
Min
Max
Min
Max
A
0.031
0.048
0.80
1.22
A1
0.002
0.006
0.05
0.15
B
0.012
0.020
0.30
0.50
B1
0.030
0.035
0.76
0.89
C
0.003
0.008
0.08
0.20
D
0.110
0.120
2.80
3.04
E
0.047
0.055
1.20
1.40
e1
0.075BSC
1.92 BSC
e2
0.181 BSC
4.60 BSC
H
0.083
0.104
2.10
2.64
L
0.016
0.024
0.400
0.600
4-Pin µP Voltage Supervisor with Manual Reset
Notice: The information in this document is subject to change without notice
8 of 11
ASM811, ASM812
April 2005
rev 1.5
Ordering Information
Part Number
Reset Threshold (V)
Temperature Range
Pin-Package
Package Marking
(LL Lot Code)
ASM811 ACTIVE LOW RESET, TIN-LEAD PLATED DEVICES
ASM811LEUS
4.63
-40°C to +105°C
4-SOT143
SMLL
ASM811MEUS
4.38
-40°C to +105°C
4-SOT143
SNLL
ASM811JEUS
4.00
-40°C to +105°C
4-SOT143
SOLL
ASM811TEUS
3.08
-40°C to +105°C
4-SOT143
SPLL
ASM811SEUS
2.93
-40°C to +105°C
4-SOT143
SQLL
ASM811REUS
2.63
-40°C to +105°C
4-SOT143
SRLL
ASM812 ACTIVE HIGH RESET, TIN-LEAD PLATED DEVICES
ASM812LEUS
4.63
-40°C to +105°C
4-SOT143
SSLL
ASM812MEUS
4.38
-40°C to +105°C
4-SOT143
STLL
ASM812JEUS
4.00
-40°C to +105°C
4-SOT143
SULL
ASM812TEUS
3.08
-40°C to +105°C
4-SOT143
SVLL
ASM812SEUS
2.93
-40°C to +105°C
4-SOT143
SWLL
ASM812REUS
2.63
-40°C to +105°C
4-SOT143
SXLL
ASM811 ACTIVE LOW RESET, LEAD FREE DEVICES
ASM811LEUSF
4.63
-40°C to +105°C
4-SOT143
NMLL
ASM811MEUSF
4.38
-40°C to +105°C
4-SOT143
NNLL
ASM811JEUSF
4.00
-40°C to +105°C
4-SOT143
NOLL
ASM811TEUSF
3.08
-40°C to +105°C
4-SOT143
NPLL
ASM811SEUSF
2.93
-40°C to +105°C
4-SOT143
NQLL
ASM811REUSF
2.63
-40°C to +105°C
4-SOT143
NRLL
ASM812 ACTIVE HIGH RESET, LEAD FREE DEVICES
ASM812LEUSF
4.63
-40°C to +105°C
4-SOT143
NSLL
ASM812MEUSF
4.38
-40°C to +105°C
4-SOT143
NTLL
ASM812JEUSF
4.00
-40°C to +105°C
4-SOT143
NULL
ASM812TEUSF
3.08
-40°C to +105°C
4-SOT143
NVLL
ASM812SEUSF
2.93
-40°C to +105°C
4-SOT143
NWLL
ASM812REUS
2.63
-40°C to +105°C
4-SOT143
NXLL
Notes:
•
For parts to be packed in Tape and Reel, add “-T” at the end of the part number.
•
Alliance Semiconductor's lead free parts are RoHS compliant. All parts are Lead Free by default. Contact factory for Non
Lead Free devices
4-Pin µP Voltage Supervisor with Manual Reset
Notice: The information in this document is subject to change without notice
9 of 11
ASM811, ASM812
April 2005
rev 1.5
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
„
„
„
„
4-Pin µP Voltage Supervisor with Manual Reset
Notice: The information in this document is subject to change without notice
10 of 11
ASM811, ASM812
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: ASM811, ASM812
Document Version: v 1.5
© 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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