RT9819_11 Datasheet, PDF (1/12 Pages) Richtek Technology Corporation – Micro-Power Voltage Detectors

RT9819
Micro-Power Voltage Detectors
General Description
Features
The RT9819 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 RT9819 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
z Internally Fixed Threshold 1.2V to 5V in 0.1V Step
z High Accuracy ±1.5%
z Low Supply Current 3μA
z No External Components Required
z Quick Reset within 20μs
z Built-in Recovery Delay Include 0ms, 55ms, 220ms,
450ms Options
z Low Functional Supply Voltage 0.9V
z CMOS Push-Pull Output
z Small SC-70-3, SC-82 and SOT-23-3 Packages
z RoHS Compliant and 100% Lead (Pb)-Free
certain delay time. RT9819 is provided in SC-70-3,
SC-82 and SOT-23-3 packages.
Applications
Ordering Information
RT9819 ^-
Package Type
U3 : SC-70-3
V : SOT-23-3
VL : SOT-23-3 (L-Type)
Y : SC-82
YR : SC-82 (R-Type)
z Computers
z Controllers
z Intelligent Instruments
z Critical μP and μC Power Monitoring
z Portable/Battery-Powered Equipment
Typical Application Circuit
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
VDD
RT9819
GND VDD
Threshold Voltage
12 : 1.2V
13 : 1.3V
up
RESET/
RESET
RESET/
RESET
:
49 : 4.9V
50 : 5.0V
Marking Information
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)
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
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.
DS9819-07 April 2011
www.richtek.com
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