PulseCore ASM161TCUSF/T μp supervisory circuit Datasheet

ASM161/ASM162
April 2008
rev 1.5
µP Supervisory Circuit
General Description
Reset Threshold
The ASM161 and ASM162 are cost effective, low power
Part Suffix
Voltage (V)
L
4.63
M
4.38
reset is asserted and remains asserted for atleast 800ms
J
4.00
after VCC has risen above the reset threshold. An
T
3.08
S
2.93
R
2.63
supervisory circuits that monitor power supplies in
microprocessor, microcontroller and digital systems. If the
power supply drops below the reset threshold level, a
improved manual reset architecture gives the system
designer additional flexibility.
The debounced manual reset input is negative edge
triggered. The reset pulse period generated by a MR
Key Features
transition is a minimum of 800 ms and a maximum of
• Edge triggered manual reset input
2 sec duration. In addition, The MR input signal is
• single pulse output
blocked for an additional 49µS minimum after the reset
• 49µS minimum MR disable period after reset
pulse
• CMOS/TTL logic or switch interface
ends.
During
the
MR
disable
period,
the
microcontroller is guaranteed a time period free of
• Debounced input
additional manual reset signals. During this period DRAM
• Low supply current extends battery life
contents can be refreshed or other critical system tasks
6µA / 15µA typ/max at 5.5V
undertaken.
4.5µA / 10µA typ/max at 3.6V
Low
power
consumption
makes
the
ASM161/162 ideal for use in portable and battery
• Long reset period
operated
• 0.8 sec minimum, 2 sec maximum
equipments.
With
3V
supplies
power
consumption is 8µW typically and 30µW maximum. The
ASM161 has an open-drain, active-LOW RESET output
and requires an external pull-up resistor. The ASM162
has an active HIGH RESET output.
• Two reset polarity options
ASM161: Active LOW, open-drain
ASM162: Active HIGH
• Pinout matches the ASM811/812
• Small 4-Pin SOT-143 package
The ASM161/162 are offered in compact 4-pin SOT-143
• Two temperature ranges: 0°c to 70°c and -40°c to +85°c
packages. No external components are required to trim
threshold voltage for monitoring different supply voltages.
Applications
With six different factory set, reset, threshold ranges from
• PDAs
2.63V to 4.63V, the ASM161/162 are suitable for
• Appliances
monitoring 5V, 3.6V and 3.0V supplies. The ASM161/162
• Computers and embedded controllers
are available in temperature ranges 0°c to 70°c and -40°c
• Wireless communication systems
to +85°c.
• Battery operated and intelligent instruments
• Automotive systems
• Safety systems
PulseCore Semiconductor Corporation
1715 S. Bascom Ave Suite 200 Campbell, CA 95008 • Tel: 408-879-9077 • Fax: 408-879-9018
www.pulsecoresemi.com
Notice: The information in this document is subject to change without notice.
ASM161/ASM162
April 2008
rev 1.5
Typical Operating Circuit
Block Diagram
Pin Configuration
RESET is open drain
µP Supervisory Circuit
Notice: The information in this document is subject to change without notice.
2 of 9
ASM161/ASM162
April 2008
rev 1.5
Pin Description
Pin #
Pin
ASM161
ASM162
1
1
2
-
Function
Name
GND
RESET
Ground.
Active-LOW, open-drain reset output. RESET remains LOW while VCC is
below the reset threshold and for 800ms minimum after VCC rises above the
reset threshold. An external pull-up resistor is needed.
-
2
RESET
Active HIGH reset output. RESET remains HIGH while VCC is below the
reset threshold and for 800ms after VCC rises above the reset threshold.
Manual reset input. A negative going edge transition on MR asserts reset.
Reset remains asserted for one reset time-out period (800 ms min). This
3
3
MR
active-LOW input has an internal pull-up resistor. It can be driven from a
TTL or CMOS logic line or shorted to ground with a switch. Leave open if
unused.
4
4
VCC
Power supply input voltage.
Detailed Description
Manual Reset
The reset function ensures the microprocessor is properly
The ASM161/162 have a unique manual reset circuit. A
reset and powers up into a known condition after a power
negative going edge transition on MR initiates the reset.
failure.
A manual reset generates a single reset pulse of fixed
length. The output-reset pulse remains asserted for the
Reset Timing
A reset is generated whenever the supply voltage is
below the threshold level (VCC < VTH). The reset duration
is at least 800ms after VCC has risen above the reset
threshold and is guaranteed to be no more than
Reset Active Time-Out Period tRP and then clears. Once
the reset pulse is completed, the MR input remains
disabled for at least 49µS but not more than 122µS. This
period is specified as tMRD.
2 seconds. The rest signal remains active as long as the
monitored supply voltage is below the internal threshold
During the MR disabled period, the microcontroller is
guaranteed a time period free of new manual reset
voltage.
signals. This period can be used to refresh critical DRAM
The ASM161 has an open-drain, active LOW RESET
contents or other system tasks.
output (which is guaranteed to be in the correct state for
VCC down to 1.1 V). The ASM161 uses an external pullup resistor. Output leakage current is under 1µA. A high
resistance value can be used to minimize current drain.
The ASM162 generates an active-HIGH RESET output.
The MR pin must be taken HIGH and LOW again after
the tMRD period has been completed to initiate another
reset pulse.
The manual reset input has an internal 20kΩ pull-up
resistor. MR can be left open if not used.
Part Number
ASM161
ASM162
Reset Polarity
LOW (use external pull-up resistor)
HIGH
µP Supervisory Circuit
Notice: The information in this document is subject to change without notice.
3 of 9
ASM161/ASM162
April 2008
rev 1.5
Application Information
Valid Reset with VCC under 1.1V
Glitch Resistance
To ensure that logic inputs connected to the ASM162
The ASM161/162 are relatively immune to short duration
negative-going VCC transients/glitches. A VCC transient
RESET pin are in a known state when VCC is under 1.1V,
a 100kΩ pull-down resistor at RESET is needed. The
that goes 100mV below the reset threshold and lasts 20s
value is not critical.
or less will not typically cause a reset pulse.
This scheme does not work with the open-drain outputs
of ASM161.
Absolute Maximum Ratings
Parameter
Min
Max
Unit
-0.3
6.0
V
-0.3
VCC + 0.3
V
20
mA
Rate of Rise at VCC
100
V/µs
Power Dissipation (TA = 70°C)
320
mW
Pin Terminal Voltage with Respect to Ground
VCC
RESET, RESET and MR
Input Current at VCC and MR
Operating Temperature Range
-40
85
°C
Storage Temperature Range
-65
160
°C
300
°C
2
200
KV
V
Lead Temperature (soldering, 10 sec)
ESD rating
HBM
MM
Note: These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for prolonged time periods may
affect device reliability.
µP Supervisory Circuit
Notice: The information in this document is subject to change without notice.
4 of 9
ASM161/ASM162
April 2008
rev 1.5
Electrical Characteristics
Unless otherwise noted, VCC is over the full range and TA = 0°c to 70°c for ASM161/162 X C and TA = -40°c to +85°c for ASM161/162 X E devices. 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
Parameter
Symbol
Input Voltage (VCC)
Range
VCC
Supply Current
(Unloaded)
ICC
Conditions
TA = 0°C to 70°C
J devices
VTH
T devices
S devices
R devices
Reset Threshold
Temp Coefficient
VCC to reset delay
Reset Pulse Width
MR Minimum Pulse
Width
MR Glitch Immunity
MR to RESET
Propagation Delay
MR Input Threshold
MR Delay to MR
Retrigger
MR pull-up resistance
Low RESET output
voltage (ASM161)
RESET Output
Voltage (ASM162)
TA = 25°C
Note 1
TA = 25°C
Note 1
TA = 25°C
Note 1
TA = 25°C
Note 1
TA = 25°C
Note 1
TA = 25°C
Note 1
Unit
V
15
µA
4.56
4.50
4.31
4.25
3.93
3.89
3.04
3.00
2.89
2.85
2.59
2.55
TCVTH
tRPW
Max
5.5
6
VCC < 3.6V R/S/T
M devices
TYP
1.1
VCC < 5.5V L/M/J
L Devices
Reset Threshold
Min
4.5
4.63
4.38
4.00
3.08
2.93
2.63
10
4.70
4.75
4.45
4.50
4.06
4.10
3.11
3.15
2.96
3.00
2.66
2.70
V
ppm/
°C
µS
30
VCC = VTH to (VTH -100mV)
TA = 0°C to 70°C
TA = -40°C to 85°C
tMR
800
600
20
1400
2000
2240
ms
10
VIH
VIL
VIH
VIL
VCC > VTH(MAX), L/M/J devices
VCC > VTH(MAX), R/S/T devices
tMRD
TA = 0°C to 70°C
VOH
1.8<VCC<VTHmin., ISOURCE = 150 µA
RESET Output
Leakage Current
(ASM161)
ILKG
VDRAIN < 6.0V, 0°C < TA < 70°C
0.5
µS
0.7VCC
48
TA = -40°C to 85°C
HIGH RESET Output
Voltage (ASM162)
ns
0.8
85
0.25VCC
122
85
10
VOL
100
2.3
VCC=VTH min., ISINK=1.2mA,
ASM161 R/S/T
VCC=VTH min., ISINK=3.2mA,
ASM161L/M/J
VCC > 1.1, ISINK = 50µA
VCC=VTH max., ISINK=1.2mA,
ASM162 R/S/T
VCC=VTH max., ISINK=3.2mA,
ASM162 L/M/J
VOL
µS
20
30
V
V
V
V
µS
KΩ
0.3
0.4
V
0.3
0.3
V
0.4
0.8VCC
V
1
µA
Notes: 1. Over operating temperature range.
µP Supervisory Circuit
Notice: The information in this document is subject to change without notice.
5 of 9
ASM161/ASM162
April 2008
rev 1.5
Package Dimensions
Plastic SOT - 143 (4Pin)
µP Supervisory Circuit
Notice: The information in this document is subject to change without notice.
6 of 9
ASM161/ASM162
April 2008
rev 1.5
Ordering Information
Part Number1
Package Marking
Reset Threshold (V)
Temperature (°C)
Pins-Package
ASM161LCUS/T
4.63
0 TO 70
4-SOT-143
TALL
ASM161MCUS/T
4.38
0 TO 70
4-SOT-143
TBLL
(LL Lot Code)
Tin Lead Devices
ASM161JCUS/T
4.00
0 TO 70
4-SOT-143
TCLL
ASM161TCUS/T
3.08
0 TO 70
4-SOT-143
TDLL
ASM161SCUS/T
2.93
0 TO 70
4-SOT-143
TELL
ASM161RCUS/T
2.63
0 TO 70
4-SOT-143
TFLL
ASM162LCUS/T
4.63
0 TO 70
4-SOT-143
TGLL
ASM162MCUS/T
4.38
0 TO 70
4-SOT-143
THLL
ASM162JCUS/T
4.00
0 TO 70
4-SOT-143
TILL
ASM162TCUS/T
3.08
0 TO 70
4-SOT-143
TJLL
ASM162SCUS/T
2.93
0 TO 70
4-SOT-143
TKLL
ASM162RCUS/T
2.63
0 TO 70
4-SOT-143
TLLL
ASM161LEUS/T
4.63
-40 TO 85
4-SOT-143
TMLL
ASM161MEUS/T
4.38
-40 TO 85
4-SOT-143
TNLL
ASM161JEUS/T
4.00
-40 TO 85
4-SOT-143
TOLL
ASM161TEUS/T
3.08
-40 TO 85
4-SOT-143
TPLL
ASM161SEUS/T
2.93
-40 TO 85
4-SOT-143
TQLL
ASM161REUS/T
2.63
-40 TO 85
4-SOT-143
TRLL
ASM162LEUS/T
4.63
-40 TO 85
4-SOT-143
TSLL
ASM162MEUS/T
4.38
-40 TO 85
4-SOT-143
TTLL
ASM162JEUS/T
4.00
-40 TO 85
4-SOT-143
TULL
ASM162TEUS/T
3.08
-40 TO 85
4-SOT-143
TVLL
ASM162SEUS/T
2.93
-40 TO 85
4-SOT-143
TWLL
ASM162REUS/T
2.63
-40 TO 85
4-SOT-143
TXLL
ASM161LCUSF/T
4.63
0 TO 70
4-SOT-143
MALL
ASM161MCUSF/T
4.38
0 TO 70
4-SOT-143
MBLL
Lead Free Devices
ASM161JCUSF/T
4.00
0 TO 70
4-SOT-143
MCLL
ASM161TCUSF/T
3.08
0 TO 70
4-SOT-143
MDLL
ASM161SCUSF/T
2.93
0 TO 70
4-SOT-143
MELL
ASM161RCUSF/T
2.63
0 TO 70
4-SOT-143
MFLL
ASM162LCUSF/T
4.63
0 TO 70
4-SOT-143
MGLL
ASM162MCUSF/T
4.38
0 TO 70
4-SOT-143
MHLL
ASM162JCUSF/T
4.00
0 TO 70
4-SOT-143
MILL
ASM162TCUSF/T
3.08
0 TO 70
4-SOT-143
MJLL
ASM162SCUSF/T
2.93
0 TO 70
4-SOT-143
MKLL
ASM162RCUSF/T
2.63
0 TO 70
4-SOT-143
MLLL
µP Supervisory Circuit
Notice: The information in this document is subject to change without notice.
7 of 9
ASM161/ASM162
April 2008
rev 1.5
Part Number1
Reset Threshold (V)
Temperature (°C)
Pins-Package
Package Marking
ASM161LEUSF/T
4.63
-40 TO 85
4-SOT-143
(LL Lot Code)
MMLL
ASM161MEUSF/T
4.38
-40 TO 85
4-SOT-143
MNLL
ASM161JEUSF/T
4.00
-40 TO 85
4-SOT-143
MOLL
ASM161TEUSF/T
3.08
-40 TO 85
4-SOT-143
MPLL
ASM161SEUSF/T
2.93
-40 TO 85
4-SOT-143
MQLL
ASM161REUSF/T
2.63
-40 TO 85
4-SOT-143
MRLL
ASM162LEUSF/T
4.63
-40 TO 85
4-SOT-143
MSLL
ASM162MEUSF/T
4.38
-40 TO 85
4-SOT-143
MTLL
ASM162JEUSF/T
4.00
-40 TO 85
4-SOT-143
MULL
ASM162TEUSF/T
3.08
-40 TO 85
4-SOT-143
MVLL
ASM162SEUSF/T
2.93
-40 TO 85
4-SOT-143
MWLL
ASM162REUSF/T
2.63
-40 TO 85
4-SOT-143
MXLL
Notes:
• For parts to be packed in Tape and Reel, add “-T” at the end of the part number.
• PulseCore Semiconductor's lead free parts are RoHS compliant.
µP Supervisory Circuit
Notice: The information in this document is subject to change without notice.
8 of 9
ASM161/ASM162
April 2008
rev 1.5
PulseCore Semiconductor Corporation
1715 S. Bascom Ave Suite 200
Campbell, CA 95008
Tel: 408-879-9077
Fax: 408-879-9018
www.pulsecoresemi.com
Copyright © PulseCore Semiconductor
All Rights Reserved
Part Number: ASM161 / ASM162
Document Version: 1.5
© Copyright 2006 PulseCore Semiconductor Corporation. All rights reserved. Our logo and name are trademarks or registered trademarks
of PulseCore Semiconductor. All other brand and product names may be the trademarks of their respective companies. PulseCore reserves
the right to make changes to this document and its products at any time without notice. PulseCore assumes no responsibility for any errors
that may appear in this document. The data contained herein represents PulseCore’s best data and/or estimates at the time of issuance.
PulseCore 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. PulseCore does not assume any responsibility or liability arising out of the application or use of any product described herein, and
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does not authorize its products for use as critical components in life-supporting systems where a malfunction or failure may reasonably be
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µP Supervisory Circuit
Notice: The information in this document is subject to change without notice.
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