RT9816
Micro-Power Voltage Detectors with Manual Reset
General Description
The RT9816 is a micro-power voltage detector with
deglitched manual reset input supervising the power
supply voltage level for microprocessors (μP) or digital
systems. It provides internally fixed threshold levels with
0.1V per step ranging from 1.0V to 5V, which covers most
digital applications. It features low supply current of 3μA.
The RT9816 performs supervisory function by sending
out a reset signal whenever the V
DD
voltage falls below a
preset threshold level. This reset signal will last the whole
period before V
DD
recovering. Once V
DD
recovered
upcrossing the threshold level, the reset signal will be
released after a certain delay time. To pull reset signal
low manually, just pull the manual reset input (MR) below
the specified V
IL
level. RT9816 is provided in
SC-82
package.
Features
Internally Fixed Threshold 1.0V to 5V in 0.1V Step
High Accuracy
±
1.5%
Low Supply Current 3μA
μ
No External Components Required
Quick Reset within 20μs
μ
Built-in Recovery Delay Include 0ms, 55ms, 220ms,
450ms Options
800ns Glitch Immunity of Manual Reset Input
Low Functional Supply Voltage 0.9V
N-Channel Open-Drain Output,
Small SC-82 Package
RoHS Compliant and 100% Lead (Pb)-Free
Applications
Computers
Controllers
Intelligent Instruments
Critical
μP
and
μC
Power Monitoring
Portable/Battery-Powered Equipment
Ordering Information
RT9816
-
Package Type
Y : SC-82
Operating Temperature Range
C : Commercial Standard
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
Threshold Voltage
12 : 1.2V
13 : 1.3V
:
49 : 4.9V
50 : 5.0V
Reset Active Timeout Period
A = 0ms
(RESET)
B = 55ms
(RESET)
C = 220ms
(RESET)
D = 450ms
(RESET)
E = 0ms
(RESET)
F = 55ms
(RESET)
G = 220ms
(RESET)
H = 450ms
(RESET)
Note :
RichTek Pb-free
and Green products
are :
RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
100%matte tin (Sn) plating.
DS9816-03 March 2007
Marking Information
For marking information, contact our sales representative
directly or through a RichTek distributor located in your
area, otherwise visit our website for detail.
Pin Configurations
(TOP VIEW)
VDD
4
1
GND
MR
3
2
RESET/
RESET
SC-82
Note
: There is no pin1 indicator on top mark for SC-82 type,
and pin 1 will be lower left pin when reading top mark from
left to right. Pin2 of SC-82 is wider than other pins.
www.richtek.com
1
RT9816
Typical Application Circuit
VDD
up
RESET/
RESET
100k
Pull Up
RT9816
GND
RESET/
RESET
VDD
MR
Functional Pin Description
Pin Name
GND
RESET
RESET
MR
Pin Function
Ground Pin
Active Low Open-Drain Reset Output
Active High Open-Drain Reset Output
Manual Reset
Power Pin
VDD
Function Block Diagram
VDD
MR
RESET/
RESET
VSET
Threshold
Voltage Setting
CMP
Timer
N MOS
GND
POR
Power On Reset
www.richtek.com
2
DS9816-03 March 2007
RT9816
Absolute Maximum Ratings
(Note 1)
Terminal Voltage (with Respect to GND)
V
DD
------------------------------------------------------------------------------------------------------------------------
−
0.3V to 6.0V
All Other Inputs --------------------------------------------------------------------------------------------------------
−
0.3V to V
DD
+0.3V
Input Current, I
VDD
----------------------------------------------------------------------------------------------------- 20mA
Power Dissipation, PD @ T
A
= 25°C
SC-82 -------------------------------------------------------------------------------------------------------------------- 0.25W
Package Thermal Resistance (Note 4)
SC-82,
θ
JA
--------------------------------------------------------------------------------------------------------------- 400°C
Lead Temperature (Soldering, 10sec.) ---------------------------------------------------------------------------- 260°C
Storage Temperature Range ----------------------------------------------------------------------------------------
−
65°C to 125°C
ESD Susceptibility (Note 2)
HBM (Human Body Mode) ------------------------------------------------------------------------------------------ 2kV
MM (Machine Mode) -------------------------------------------------------------------------------------------------- 200V
Recommended Operating Conditions
(Note 3)
Junction Temperature Range ----------------------------------------------------------------------------------------
−
40°C to 125°C
Ambient Temperature Range ----------------------------------------------------------------------------------------
−
40°C to 85°C
Electrical Characteristics
(V
DD
= 3V, unless otherwise specified)
Parameter
Operating V
DD
(V
OUT
) Range
Supply Current
Reset Threshold
MR Input Threshold
MR Glitch Rejection
Threshold Voltage Accuracy
V
DD
Drop to Reset Delay
RT9816A/E
Reset Active
Time Out Period
RT9816B/F
RT9816C/G
RT9816D/H
RESET Output Voltage Low
Hysteresis Width
Symbol
V
DD
I
DD
V
TH
V
IL
V
IH
ΔV
TH
t
RD
Test Conditions
Min
0.9
Typ
--
3
1.2 to 5.0
--
--
800
--
20
0
55
220
450
--
0.01V
T H
Max
6
8
--
0.25V
DD
--
--
+1.5
--
--
75
297
608
0.4
--
Units
V
μA
V
V
ns
%
μs
ms
ms
ms
ms
V
V
V
TH
= 3V , V
DD
= 4.5V T
A
= 27°C
T
A
= 27°C
T
A
= 27°C, V
TH
> 1.2V
T
A
= 27°C, V
TH
> 1.2V
--
--
--
0.7V
DD
--
−1.5
--
--
T
A
= 27°C
Drop = V
TH
-125mV
t
RP
V
DD
≥
1.02×V
TH
35
143
292
V
OL
V
HYS
3 = V
DD
< V
TH
I
S INK
>3.5mA
--
--
DS9816-03 March 2007
www.richtek.com
3
RT9816
Note 1.
Stresses listed as the above
“Absolute
Maximum Ratings” may cause permanent damage to the device. These are for
stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the
operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended
periods may remain possibility to affect device reliability.
Note 2.
Devices are ESD sensitive. Handling precaution recommended.
Note 3.
The device is not guaranteed to function outside its operating conditions.
Note 4.
θ
JA
is measured in the natural convection at T
A
= 25°C on a low effective thermal conductivity test board of
JEDEC 51-3 thermal measurement standard.
www.richtek.com
4
DS9816-03 March 2007
RT9816
Typical Operating Characteristics
Nch Driver Output Current vs. V
DS
2.4
Nch Driver Output Current vs. V
DS
60
RT9816A-12
V
DD
= 1.1V
RT9816C-30
V
DD
= 2.8V
V
DD
= 2.5V
Output Current (mA)
2
1.6
1.2
0.8
0.4
0
0
0.3
0.6
0.9
50
Output Current (mA)
40
30
V
DD
= 2.0V
20
10
0
V
DD
= 1.0V
V
DD
= 1.5V
1.2
1.5
0
0.5
1
1.5
2
2.5
3
3.5
V
DS
(V)
V
DS
(V)
Nch Driver Output Current vs. V
DS
120
100
Output Voltage vs. Input Voltage
7
6
RT9816A-45
RT9816
Output Current (mA)
Output Volgate (V)
5
4
3
80
60
40
20
0
0
1
2
3
4
5
V
DD
= 4.4V
= 4.0V
= 3.5V
= 3.0V
= 2.5V
= 2.0V
= 1.5V
4.5V
2
1
0
0
1
2
3
4
5
6
1.2V
V
DS
(V)
Input Volgate (V)
Supply Current vs. Input Voltage
6
5
Supply Current vs. Input Voltage
4
3.5
RT9816A-12
80°C
RT9816C-30
Supply Current (uA)
Supply Current (uA)
3
2.5
80°C
4
25°C
3
2
1
0
0
1
2
3
4
5
6
25°C
2
1.5
1
0.5
0
0
1
2
3
4
5
6
-30°C
-30°C
Input Voltage (V)
Input Voltage (V)
DS9816-03 March 2007
www.richtek.com
5
