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PDF RT9801ACE Data sheet ( Hoja de datos )
| Número de pieza | RT9801ACE | |
| Descripción | USER PROGRAMMABLE MICRO POWER VOLTAGE DETECTORS | |
| Fabricantes | ETC | |
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RT9801A/B
User Programmable Micro-Power Voltage Detectors
General Description
The RT9801A/B is a micro-power voltage detector
supervising the power supply voltage level for
microprocessors (μP) or digital systems. It provides user
programmable threshold levels with 0.1V step ranging
from 1.5V to 5V, which covers most digital applications. It
features low supply current of 3μA. Selection of VTH is
easily achieved through 3 pins connected to GND, VDD or
floating for different threshold voltage settings. Two versions
of threshold voltages, 1.5V to 4V and 2.5V to 5V, which
are programmed in factory are offered by customer
demands.
The RT9801A/B performs supervisory function by sending
out a reset signal whenever the VDD voltage falls below a
preset threshold level. This reset signal will last the whole
period before VDD recovering. Reset signal will release after
VDD is recovered and last for the whole period of Reset
Active Time-out period.
RT9801A/B is N-Channel, open-drain output and provided
in SOT-23-6 package.
Ordering Information
RT9801
Package Type
E : SOT-23-6
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
Note :
Reset Threshold
A : 2.5V to 5V
B : 1.5V to 4V
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.
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
Features
z User Programmable Threshold 1.5V to 5V in 0.1V
Step with ±3% Accuracy
z Low Supply Current 3μA
z Quick Reset within 20μs
z Built-in Recovery Delay 200ms
z Low Functional Supply Voltage 0.9V
z Small SOT-23-6 Package
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)
654
23
SOT-23-6
Typical Application Circuit
μP
VDD GND
RESET
VSET0 VSET1
RT9801
GND VSET2
RESET VDD
Pull Up
RT9801 VTH = 2.5V in this example
DS9801A/B-13 April 2011
www.richtek.com
1
1 page  
Typical Operating Characteristics
N-Ch Driver Sink Current vs. VRESET
7
6
VDD = 1.7V
5
4
VDD = 1.5V
3
2
1 TA = 25°C
VTH = 2V
0
0 0.5 1 1.5 2 2.5 3
VRESET (V)
N-Ch Driver Sink Current vs. VRESET
18
VDD = 2.8V
15
12
9
6 VDD = 2.0V
3
VDD = 1.5V
TA = 25°C
VTH = 3V
0
0 0.5 1 1.5 2 2.5 3
VRESET (V)
N-Ch Driver Sink Current vs. VRESET
40
VDD = 4.5V
32
VDD = 4.0V
24 VDD = 3.5V
VDD = 3.0V
16
VDD = 2.5V
8 VDD = 2.0V
TA = 25°C
VDD = 1.5V
VTH = 5V
0
012345
VRESET (V)
DS9801A/B-13 April 2011
RT9801A/B
N-Ch Driver Sink Current vs. VRESET
12
VDD = 2.2V
10
VDD = 2.0V
8
6
4 VDD = 1.5V
2 TA = 25°C
VTH = 2.4V
0
0 0.5 1 1.5 2 2.5 3
VRESET (V)
N-Ch Driver Sink Current vs. VRESET
36
VDD = 4.0V
30
24
18
12
6
0
0
VDD = 3.5V
VDD = 3.0V
VDD = 2.5V
VDD = 2.0V
VDD = 1.5V
TA = 25°C
VTH = 4.5V
123
VRESET (V)
4
7
TA = 25°C
6
5
VRESET vs. VDD
5.0V
4.5V
4 3.0V
3 2.4V
2 2.0V
1
0
0.0 1.0 2.0 3.0 4.0 5.0 6.0
VDD (V)
www.richtek.com
5
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| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet RT9801ACE.PDF ] | |
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