ASM1816
Low Power, 3.3 V/3.0 V,
mP
Reset, Active LOW,
Open-Drain Output
Description
ASM1816−R
The ASM1816 is a voltage supervisory device with low−power,
3.3 V/3 V
mP
Reset, active LOW, open−drain output. Maximum
supply current over temperature is a low 15
mA
(at 3.6 V).
The ASM1816 generates an active LOW reset signal whenever the
monitored supply is out of tolerance. A precision reference and
comparator circuit monitor power supply (V
CC
) level. Tolerance level
options are 5%, 10%, 15% and 20%. When an out−of−tolerance
condition is detected, an internal power−fail signal is generated which
forces an active LOW reset signal. After V
CC
returns to an
in−tolerance condition, the reset signal remains active for 150 ms to
allow the power supply and system microprocessor to stabilize.
The ASM1816 is designed with a open−drain output stage and
operates over the extended industrial temperature range. Devices are
available in TO−92 and compact surface mount SOT−23 packages.
Other low power products in this family include the
ASM1810/11/12/15/17, ASM1233D and ASM1233M.
Features
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SOT−23
3 LEAD
CASE 527AG
TO−92
3 LEAD
CASE 29−11
PIN CONFIGURATIONS
1
RESET
3
GND
2
V
CC
•
Low Supply Current
•
•
•
•
•
•
•
•
•
•
•
•
•
•
20
mA
Maximum (5.5 V)
15
mA
Maximum (3.6 V)
Automatically Restarts a Microprocessor after Power Failure
150 ms Reset Delay after V
CC
Returns to an In−tolerance Condition
Active LOW Power−up Reset
Precision Temperature−compensated Voltage Reference and
Comparator
Eliminates External Components
TO−92 and Compact Surface Mount SOT−23 Package
Operating Temperature
−40°C
to +85°C
SOT−23
(Top View)
1 2 3
(Top View)
1 2 3
RESET
V
CC
GND
TO−92
ASM1816
Applications
Set−top Boxes
Cellular Phones
PDAs
Energy Management Systems
Embedded Control Systems
Printers
Single Board Computers
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 8 of this data sheet.
©
Semiconductor Components Industries, LLC, 2011
August, 2011
−
Rev. 3
1
Publication Order Number:
ASM1816/D
ASM1816
Figure 1. Typical Application
Figure 2. Block Diagram
Table 1. PIN DESCRIPTION
TO−92
Pin #
1
2
3
SOT−23
Pin #
1
2
3
Pin Name
RESET
V
CC
GND
Description
Active LOW reset output
Power supply input
Ground
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2
ASM1816
Table 2. ABSOLUTE MAXIMUM RATINGS
Parameter
Voltage on V
CC
(Note 1)
Voltage on RESET (Note 1)
Operating Temperature Range
Soldering Temperature (for 10 sec)
Storage Temperature
ESD rating
HBM
MM
−55
Min
−0.5
−0.5
−40
Max
7
V
CC
+ 0.5
+85
+260
+125
2
200
Unit
V
V
°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. Voltages are measured with respect to ground.
Table 3. DC ELECTRICAL CHARACTERISTICS
(Unless otherwise noted, V
CC
= 1.2 V to 5.5 V and specifications are over the
operating temperature range of
−40°C
to +85°C. All voltages are referenced to ground.)
Parameter
Supply Voltage
Output Current
Operating Current
Symbol
V
CC
I
OL
I
CC
V
CCTP
Output = 0.4 V, V
CC
> 2.7 V
V
CC
< 5.5 V, RESET output open
V
CC
≤
3.6 V, RESET output open
V
CC
Trip Point
ASM1816R−5
ASM1816R−10
ASM1816R−15
ASM1816R−20
Internal Pull−up Resistor
Output Capacitance
V
CC
Detect to RESET Low
V
CC
Slew Rate
(V
CCTP
(MAX) to V
CCTP
(MIN)
V
CC
Slew Rate
(V
CCTP
(MIN) to V
CCTP
(MAX)
V
CC
Detect to RESET High
R
P
C
OUT
t
RPD
t
F
(Note 2)
t
R
t
RPU
t
r
= 5
ms
300
0
100
150
250
2
2.98
2.80
2.635
2.47
3.5
Conditions
Min
1.2
10
8
6
3.06
2.88
2.72
2.55
5.5
20
15
3.15
2.97
2.805
2.64
7.5
10
5
KW
pF
ms
ms
ns
ms
V
Typ
Max
5.5
Unit
V
mA
mA
2. The t
F
value is for reference in defining values for t
RPD
and should not be considered for proper operation or use.
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3
ASM1816
Application Information
Operation
−
Power Monitor
The ASM1816 detects out−of−tolerance power supply
conditions. It resets a processor during power−up, power
down and issues a reset to the system processor when the
monitored power supply voltage is below the reset
threshold. When an out−of−tolerance V
CC
voltage is
detected, the RESET signal is asserted. On power−up,
RESET is kept active (LOW) for approximately 150 ms
after the power supply voltage has reached the selected
tolerance. This allows the power supply and microprocessor
to stabilize before RESET is released.
Figure 3. Timing Diagram: Power−Up
Figure 4. Timing Diagram: Power−Down
Table 4. FAMILY SELECTION GUIDE
Part #
ASM1810
ASM1811
ASM1812
ASM1815
ASM1816
ASM1817
ASM1233D
ASM1233M
RESET Voltage (V)
4.620, 4.370, 4.120
4.620, 4.350, 4.130
4.620, 4.350, 4.130
3.060, 2.880, 2.550
3.060, 2.720, 2.880, 2.550
3.060, 2.880, 2.550
4.625, 4.375, 4.125
4.625, 4.375, 2.720
RESET Time (ms)
150
150
150
150
150
150
350
350
Output Stage
Push−Pull
Open−Drain
Push−Pull
Push−Pull
Open−Drain
Push−Pull
Open−Drain
Open−Drain
RESET Polarity
LOW
LOW
HIGH
LOW
LOW
HIGH
LOW
LOW
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ASM1816
PACKAGE DIMENSIONS
SOT−23, 3 Lead
CASE 527AG−01
ISSUE O
SYMBOL
A
A1
b
c
E1
E
D
E
E1
e
1
e
e1
TOP VIEW
2
e1
L
L1
MIN
0.89
0.013
0.37
0.085
2.80
2.10
1.20
0.95 BSC
1.90 BSC
0.40 REF
0.54 REF
NOM
MAX
1.12
0.10
0.50
0.18
3.04
2.64
1.40
D
3
θ
0º
8º
A
q
b
A1
L1
L
c
SIDE VIEW
Notes:
(1) All dimensions are in millimeters. Angles in degrees.
(2) Complies with JEDEC TO-236.
END VIEW
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