ASM1816
Low Power 3.3V/3.0V
μP
Reset,
Active LOW, Open-Drain Output
General Description
The ASM1816 is a voltage supervisory device with low-
power, 3.3V/3V μP Reset, active LOW, open-drain
output. Maximum supply current over temperature is a
low 15μA (at 3.6V).
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
150ms 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.
Key Features
Low Supply Current
20 μA maximum (5.5 V)
15μA maximum (3.6 V)
Automatically restarts a microprocessor after power
failure
150ms 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
Applications
Set-top boxes
Cellular phones
PDAs
Energy management systems
Embedded control systems
Printers
Single board computers
Typical Application
©2010 SCILLC. All rights reserved.
JANUARY 2010 – Rev. 2
Publication Order Number:
ASM1816/D
ASM1816
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
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 150ms
after the power supply voltage has reached the selected
tolerance. This allows the power supply and
microprocessor to stabilize before RESET is released.
Rev. 2 | Page 3 of 10 | www.onsemi.com
ASM1816
Absolute Maximum Ratings
Parameter
Voltage on V
CC
2
2
1
Min
-0.5
-0.5
-40
-55
Max
7
V
CC
+ 0.5
+85
+260
+125
2
200
Unit
V
V
°C
°C
°C
KV
V
Voltage on RESET
Operating Temperature Range
Soldering Temperature (for 10 sec)
Storage Temperature
ESD rating
HBM
MM
Notes: 1. These are stress ratings only and functional implication is not implied. Exposure to absolute maximum ratings for extended periods may affect
device reliability.
2. Voltages are measured with respect to ground.
DC Electrical Characteristics
Unless otherwise noted, V
CC
= 1.2V to 5.5V 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
Symbol
V
CC
I
OL
Conditions
Min
1.2
Typ
Max
5.5
Unit
V
mA
Output = 0.4V, V
CC
> 2.7V
V
CC
< 5.5V, RESET output
open
V
CC
≤ 3.6V, RESET output
open
ASM1816R-5
10
8
6
2.98
2.80
2.635
2.47
3.5
3.06
2.88
2.72
2.55
5.5
2
300
0
20
Operating Current
I
CC
μA
15
3.15
2.97
2.805
2.64
7.5
10
5
KΩ
pF
μs
μs
ns
150
250
ms
V
V
CC
Trip Point
V
CCTP
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
t
R
t
RPU
t
r
= 5μs
100
Note: The t
F
value is for reference in defining values for t
RPD
and should not be considered for proper operation or use.
Rev. 2 | Page 4 of 10 | www.onsemi.com
Embedded System
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