RT9818_16 Datasheet, PDF (1/14 Pages) Richtek Technology Corporation – Micro-Power Voltage Detectors

®
RT9818
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.
Ordering Information
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
Note :
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)
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.
Copyright ©2016 Richtek Technology Corporation. All rights reserved.
DS9818-11 August 2016
Features
 Internally Fixed Threshold 1.2V to 5V in 0.1V Step
 High Accuracy ±1.5%
 Low Supply Current 3μA
 No External Components Required
 Quick Reset within 20μs
 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
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
Typical Application Circuit
VDD
P
RESET/
RESET
100k
Pull Up
RT9818
GND
VDD
RESET/
RESET
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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