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RT9818A-37GB

P1-P3P4-P6P7-P9P10-P12P13-P14
RT9818
®
DS9818-11 August 2016 www.richtek.com
1
©
Copyright 2016 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
Features
Internally Fixed Threshold 1.2V to 5V in 0.1V Step
High Accuracy
±±
±±
±1.5%
Low Supply Current 3
μμ
μμ
μA
No External Components Required
Quick Reset within 20
μμ
μμ
μs
Built-In Recovery Delay Include 0ms, 55ms, 220ms,
450ms Options
Low Functional Supply Voltage 0.9V
N-Channel Open-Drain Output
Small SC-82, SC-70-3, SOT-23-3, SOT-23-5, SOT-89
Packages
RoHS Compliant and 100% Lead (Pb)-Free
Applications
Computers
Controllers
Intelligent Instruments
Critical μP and μC Power Monitoring
Portable/Battery-Powered Equipment
Micro-Power Voltage Detectors
General Description
The RT9818 is a micro-power voltage detector 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 1.2V to 5V, which
covers most digital applications. It features low supply
current of 3μA. The RT9818 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. RT9818 is
provided in SC-82, SC-70-3, SOT-23-3, SOT-23-5 and
SOT-89 packages.
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
Ordering Information
Typical Application Circuit
GND
RESET/
RESET
VDD
RT9818
RESET/
RESET
VDD
P
Pull Up
100k
RT9818
Package Type
U3 : SC-70-3
V : SOT-23-3
VL : SOT-23-3 (L-Type)
B : SOT-23-5
X : SOT-89
Y : SC-82
YR : SC-82 (R-Type)
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
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 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.
RT9818
2
DS9818-11 August 2016www.richtek.com
©
Copyright 2016 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
Functional Pin Description
Pin Name Pin Function
GND Ground.
RESET Active low open-drain reset output.
RESET Active high open-drain reset output.
VDD Power pin.
Pin Configuration
(TOP VIEW)
SC-70-3
GND
VDD
2
3
RESET/
RESET
SOT-89SOT-23-5
VDD
GND
NC
NC
4
23
5
RESET/
RESET
SOT-23-3 (L-Type)
GND
VDD
2
3
RESET/
RESET
SOT-23-3
GND
VDD
2
3
RESET/
RESET
SC-82 (R-Type)
NC
VDD
GND
3
2
4
RESET/
RESET
SC-82
GND
NC
VDD
3
2
4
RESET/
RESET
231
GNDVDD
RESET/
RESET
Functional Block Diagram
Timing Diagram
Timer
VSET
Threshold
Voltage Setting
POR
Power On Reset
CMP
N MOS
GND
RESET/
RESET
VDD
V
TH
V
DD
Delay Time (0, 55, 220, 450ms)
Delay Time (0, 55, 220, 450ms)
V
RESET
0V
0V
0V
V
RESET
RT9818
3
DS9818-11 August 2016 www.richtek.com
©
Copyright 2016 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
Absolute Maximum Ratings (Note 1)
Terminal Voltage (with Respect to GND)
V
DD
----------------------------------------------------------------------------------------------------------------------------- −0.3V to 6V
All Other Inputs ------------------------------------------------------------------------------------------------------------- −0.3V to 6V
Input Current, I
VDD
---------------------------------------------------------------------------------------------------------- 20mA
Power Dissipation, P
D
@ T
A
= 25°C
SC-70 / SC-82--------------------------------------------------------------------------------------------------------------- 0.25W
SOT-23-3 --------------------------------------------------------------------------------------------------------------------- 0.4W
SOT-23-5 --------------------------------------------------------------------------------------------------------------------- 0.4W
SOT-89 ------------------------------------------------------------------------------------------------------------------------ 0.55W
Package Thermal Resistance (Note 2)
SC-70 / SC-82, θ
JA
--------------------------------------------------------------------------------------------------------- 400°C/W
SOT-23-3, θ
JA
---------------------------------------------------------------------------------------------------------------- 250°C/W
SOT-23-5, θ
JA
---------------------------------------------------------------------------------------------------------------- 250°C/W
SOT-89, θ
JA
------------------------------------------------------------------------------------------------------------------ 180°C/W
Lead Temperature (Soldering, 10sec.) --------------------------------------------------------------------------------- 260°C
Storage Temperature Range --------------------------------------------------------------------------------------------- −65°C to 150°C
ESD Susceptibility (Note 3)
HBM (Human Body Model) ----------------------------------------------------------------------------------------------- 2kV
Electrical Characteristics
(V
DD
= 3V, unless otherwise specified)
Parameter Symbol Test Conditions Min Typ Max Unit
Operating V
DD
(V
OUT
) Range V
DD
0.9 -- 6 V
Supply Current I
DD
V
TH
= 3V, V
DD
= 4.5V, T
A
= 27C -- 3 8 A
Reset Threshold V
TH
T
A
= 27C -- 1.2 to 5 -- V
Threshold Voltage Accuracy V
TH
T
A
= 27C 1.5 -- 1.5 %
V
DD
Drop to Reset Delay t
RD
Drop = V
TH
125mV -- 20 -- s
RT9818A/E -- 0 --
RT9818B/F 35 55 75
RT9818C/G 143 220 297
Reset Active
Time Out Period
RT9818D/H
t
RP
V
DD
1.02 x V
TH
292 450 608
ms
RESET Output Voltage Low
(Note 5)
V
OL
3 = V
DD
< V
TH
I
SINK
> 3.5mA -- -- 0.4 V
Hysteresis Width V
HYS
-- 0.01V
TH
0.016V
TH
V
Recommended Operating Conditions (Note 4)
Junction Temperature Range --------------------------------------------------------------------------------------------- −40°C to 125°C
Ambient Temperature Range --------------------------------------------------------------------------------------------- −40°C to 85°C
P1-P3P4-P6P7-P9P10-P12P13-P14

RT9818A-37GB

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Buy RT9818A-37GB
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IC VOLT DETECTOR 3.7V SOT23-5
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