ASM705, ASM706, ASM707,
ASM708, ASM813L
Low Power
mP
Supervisor
Circuits
Description
The ASM705 / 706 / 707 / 708 and ASM813L are cost effective
CMOS supervisor circuits that monitor power−supply and battery
voltage level, and
mP/mC
operation.
The family offers several functional options. Each device generates
a reset signal during power−up, power−down and during brownout
conditions. A reset is generated when the supply drops below 4.65 V
(ASM705/707/813L) or 4.40 V (ASM706/708). For 3 V power supply
applications, refer to the ASM705P/R/S/T data sheet. In addition, the
ASM705/706/813L feature a 1.6 second watchdog timer. The
ASM707/708 have both active−HIGH and active−LOW reset outputs
but no watchdog function. The ASM813L has the same pin−out and
functions as the ASM705 but has an active−HIGH reset output. A
versatile power−fail circuit has a 1.25 V threshold, useful in low
battery detection and for monitoring non−5 V supplies. All devices
have a manual reset (MR) input. The watchdog timer output will
trigger a reset if connected to MR.
All devices are available in 8−pin DIP, SO and MicroSO packages.
Features
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PDIP−8
P SUFFIX
CASE 646AA
MICRO−8
U SUFFIX
CASE 846AA
SOIC−8
S SUFFIX
CASE 751BD
PIN CONFIGURATIONS
MR
V
CC
GND
PFI
1
ASM705
ASM706
(ASM813L)
DIP/SO
(Top Views)
RESET
RESET
MR
V
CC
1
ASM707
ASM708
NC
PFO
PFI
GND
1
ASM707
ASM708
RESET
RESET
NC
PFO
•
Precision Power Supply Monitor
•
•
•
•
•
•
•
•
•
•
•
•
•
4.65 V Threshold (ASM705/707/813L)
4.40 V Threshold (ASM706/708)
Debounced Manual Reset Input
Voltage Monitor
1.25 V Threshold
Battery Monitor / Auxiliary Supply Monitor
Watchdog Timer (ASM705/706/813L)
200 ms Reset Pulse Width
Active HIGH Reset Output (ASM707/708/813L)
MicroSO Package
MR
V
CC
GND
PFI
WDO
RESET (RESET)
WDI
PFO
Applications
Computers and Embedded Controllers
Portable/Battery−operated Systems
Intelligent Instruments
Wireless Communication Systems
PDAs and Hand−held Equipment
Automotive Systems
Safety Systems
RESET (RESET)
WDO
MR
V
CC
1
ASM705
ASM706
(ASM813L)
MicroSO
(Top Views)
WDI
PFO
PFI
GND
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 11 of this data sheet.
©
Semiconductor Components Industries, LLC, 2011
August, 2011
−
Rev. 3
1
Publication Order Number:
ASM705/D
ASM705, ASM706, ASM707, ASM708, ASM813L
Figure 1. Typical Operating Circuit
Figure 2. Block Diagrams
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ASM705, ASM706, ASM707, ASM708, ASM813L
Table 1. PIN DESCRIPTION
Pin Number
ASM705/706
DIP/
SO
1
MicroSO
3
ASM707/708
DIP/
SO
1
MicroSO
3
ASM813L
DIP/
SO
1
MicroSO
3
Name
MR
Function
Manual reset input. The active LOW input triggers a
reset pulse. A 250
mA
pull−up current allows the pin
to be driven by TTL/CMOS logic or shorted to
ground with a switch.
+5 V power supply input.
Ground reference for all signals.
Power−fail input voltage monitor. With PFI less than
1.25 V, PFO goes LOW. Connect PFI to Ground or
V
CC
when not in use.
Power−fail output. The output is active LOW and
sinks current when PFI is less than 1.25 V.
Watchdog input. WDI controls the internal watchdog
timer. A HIGH or LOW signal for 1.6 sec at WDI
allows the internal timer to run−out, setting WDO
LOW. The watchdog function is disabled by floating
WDI or by connecting WDI to a high impedance
three−state buffer. The internal watchdog timer
clears when: RESET is asserted; WDI is three−
stated; or WDI sees a rising or falling edge.
Not Connected.
Active LOW reset output. Pulses LOW for 200 ms
when triggered, and stays LOW whenever V
CC
is
below the reset threshold. RESET remains LOW for
200 ms after V
CC
rises above the reset threshold or
MR goes from LOW to HIGH. A watchdog timeout
will not trigger RESET unless WDO is connected to
MR.
Watchdog output. WDO goes LOW when the 1.6
second internal watchdog timer times−out and does
not go HIGH until the watchdog is cleared. In addi-
tion, when V
CC
falls below the reset threshold,
WDO goes LOW. Unlike RESET, WDO does not
have a minimum pulse width and as soon as V
CC
exceeds the reset threshold, WDO goes HIGH with
no delay.
Active HIGH reset output. The inverse of RESET.
The ASM813L only has a RESET output.
2
3
4
4
5
6
2
3
4
4
5
6
2
3
4
4
5
6
V
CC
GND
PFI
5
6
7
8
5
−
7
−
5
6
7
8
PFO
WDI
−
7
−
1
6
7
8
1
−
−
−
−
NC
RESET
8
2
−
−
8
2
WDO
−
−
8
2
7
1
RESET
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ASM705, ASM706, ASM707, ASM708, ASM813L
Table 2. ABSOLUTE MAXIMUM RATINGS
Parameter
Pin Terminal Voltage with Respect to Ground
V
CC
All other inputs (Note 1)
Input Current at V
CC
and GND
Output Current: All outputs
Rate of Rise at V
CC
Plastic DIP Power Dissipation (Derate 9 mW/°C above 70°C)
SO Power Dissipation (Derate 5.9 mW/°C above 70°C)
MicroSO Power Dissipation (Derate 4.1 mW/°C above 70°C)
Operating Temperature Range
ASM705E/706E/707E/708E/813LE
ASM705C/706C/707C/708C/813LC
Storage Temperature Range
Lead Temperature (Soldering 10 sec)
ESD rating
HBM
MM
−40
0
−65
Min
−0.3
−0.3
Max
6.0
V
CC
+ 0.3
20
20
100
700
470
330
+85
70
160
300
2
200
Unit
V
V
mA
mA
V/ms
mV
mW
mW
°C
°C
°C
KV
V
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
1. The input voltage limits of PFI and MR can be exceeded if the input current is less than 10 mA.
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ASM705, ASM706, ASM707, ASM708, ASM813L
Table 3. ELECTRICAL CHARACTERISTICS
Unless otherwise noted, specifications are over the operating temperature range and V
CC
supply voltages are 2.7 V to 5.5 V
(ASM706P,ASM708R), 3.0 V to 5.5 V (ASM706/708S), 3.15 V to 5.5 V (ASM706/708T) and 4.1 V to 5.5 V (ASM706/708J).
Parameter
Operating Voltage Range
Symbol
V
CC
Test Conditions
ASM705/6/7/8C
ASM813L
ASM705/6/7/8E, ASM813E
Supply Current
I
CC
ASM705/706C/813LC
ASM705E/706E/813LE
ASM707C/708C
ASM707E/708E
RESET Threshold
V
RT
ASM705/707/813L (Note 2)
ASM706/708 (Note 2)
RESET Threshold
Hysteresis
RESET Pulse Width
MR Pulse Width
MR to RESET Out Delay
MR Input Threshold
t
RS
t
MR
t
MD
V
IH
V
IL
MR Pullup current
RESET Output Voltage
MR = 0 V
I
SOURCE
= 800
mA
I
SINK
= 3.2 mA
ASM705/6/7/8, V
CC
= 1.2 V,
I
SINK
= 100
mA
RESET Output Voltage
ASM707/8/813L, I
SOURCE
= 800
mA
ASM707/8, I
SINK
= 1.2 mA
ASM813L, I
SINK
= 3.2 mA
ASM813L, V
CC
= 1.2 V, I
SOURCE
= 4
mA
Watchdog Timeout Period
WDI Pulse Width
WDI Input Threshold
t
WD
t
WP
V
IH
V
IL
WDI Input Current
ASM705/6/813L, WDI = V
CC
ASM705/6/813L, WDI = 0 V
WDO Output Voltage
V
OH
V
OL
PFI Input Threshold
PFI Input Current
PFO Output Voltage
V
OH
V
OL
2. RESET (ASM705/6/7/8), RESET(ASM707/8, ASM813L)
I
SOURCE
= 800
mA
I
SINK
= 3.2 mA
ASM705/6/813L, I
SOURCE
= 800
mA
ASM705/6/813L, I
SINK
= 1.2 mA
V
CC
= 5 V
1.2
−25
V
CC
−
1.5
0.4
1.25
0.01
−150
V
CC
−
1.5
0.4
1.3
25
V
nA
V
50
−50
V
ASM705/6/813L
V
IL
= 0.4 V, V
IH
= 0.8 V
CC
ASM705/706/813L, V
CC
= 5 V
0.9
1.00
50
3.5
0.8
150
mA
1.60
2.25
S
ns
V
V
CC
−
1.5
0.4
0.4
100
V
CC
−
1.5
0.4
0.3
V
250
(Note 2)
2.0
0.8
600
mA
V
(Note 2)
(Note 2)
140
0.15
0.25
4.50
4.25
Min
1.2
1.1
1.2
75
75
50
50
4.65
4.40
40
200
280
Typ
Max
5.5
5.5
5.5
140
140
140
140
4.75
4.50
mV
ms
ms
ms
V
V
mA
Unit
V
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