RT9817 Datasheet, PDF (1/11 Pages) Richtek Technology Corporation – Micro-Power Voltage Detectors with Manual Reset

RT9817
Micro-Power Voltage Detectors with Manual Reset
General Description
The RT9817 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 1.2V to 5V, which covers most
digital applications. It features low supply current of 3μA.
The RT9817 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. RT9817 is provided in SC-82 and
SOT-143 packages.
Ordering Information
RT9817 -
Package Type
H : SOT-143
Y : SC-82
Operating Temperature Range
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.
Features
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 800ns Glitch Immunity of Manual Reset Input
z Low Functional Supply Voltage 0.9V
z CMOS Push-Pull Output
z Small SC-82 and SOT-143 Packages
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z Computers
z Controllers
z Intelligent Instruments
z Critical μP and μC Power Monitoring
z Portable/Battery-Powered Equipment
Pin Configurations
(TOP VIEW)
VDD
MR
VDD
MR
4
3
4
3
1
2
1
2
GND
RESET/
RESET
SOT-143
GND RESET/
RESET
SC-82
Note : There is no pin1 indicator on top mark for SC-82 and
SOT-143 types, and pin 1 will be lower left pin when reading
top mark from left to right. Pin2 of SC-82 and Pin1 of SOT-
143 is wider than other pins in each package.
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.
DS9817-07 August 2007
www.richtek.com
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