Loading...RICHTEK RT9808-15CB, RT9808-15CV, RT9808-15CX, RT9808-42CB, RT9808-42CV Datasheet
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Preliminary |
RT9808 |
Micro-Power Voltage Detectors
General Description
The RT9808 is a micro-power voltage detector supervising the power supply voltage level for microprocessors ( P) or digital systems. It provides internally fixed threshold levels with 0.1V per step ranging from 1.5V to 5V, which covers most digital applications. It features low supply current of 3 A.
The RT9808 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. Once VDD recovered up-crossing the threshold level, the reset signal will be released if VDD is above threshold and last for the whole period of reset active time out.
RT9808 is n-channel, open-drain output.
Applications
zComputers
zControllers
zIntelligent Instruments
zCritical P and C Power Monitoring
zPortable/Battery-Powered Equipment
Ordering Information
RT9808-
Package Type
V : SOT-23
X : SOT-89
B : SOT-25
Operating temperature range C: Commercial standard
Reset Threshold 15 : 1.5V
16 : 1.6V
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49 : 4.9V
50 : 5.0V
Features
zInternally Fixed Threshold 1.5V to 5V in 0.1V Step
z±2% Accuracy
zLow Supply Current 3 A
zQuick Reset within 20 S
zBuilt-in Recovery Delay 200mS
zLow Functional Supply Voltage 0.9V
zN-Channel Open Drain Output
zSmall 3-Pin SOT-23/SOT89 and 5-Pin SOT-25 Packages
Pin Configurations |
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Part Number |
Pin Configurations |
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RT9808CV |
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3 |
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TOP VIEW |
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(Plastic SOT-23) |
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RESET |
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2 |
2. |
GND |
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3. |
VDD |
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RT9808CX |
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TOP VIEW |
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(Plastic SOT-89) |
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1. RESET |
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2. VDD |
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3 |
3. GND |
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RT9808CB |
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TOP VIEW |
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(Plastic SOT-25) |
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5 |
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4 |
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1. |
RESET |
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2. |
VDD |
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GND |
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3 |
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4. |
NC |
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5. |
NC |
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Typical Application Circuit
VDD |
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RT9808 |
Pull |
100K |
GND |
Up |
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P |
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VDD |
RESET
RESET
DS9808-01 January 2002 |
www.richtek-ic.com.tw |
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RT9808 |
Preliminary |
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Pin Description |
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Pin Name |
Pin Function |
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GND |
Ground Pin |
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Reset Pulse Output, Negative Pulse |
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RESET |
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VDD |
Power Pin |
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NC |
No Connected |
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Function Block Diagram
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VDD |
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CMP |
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VSET |
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TIMER |
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RESET |
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N |
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Threshold Voltage Setting |
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POR
Power On Reset
www.richtek-ic.com.tw |
DS9808-01 January 2002 |
2
Preliminary |
RT9808 |
Absolute Maximum Ratings
zTerminal Voltage (with Respect to GND)
VDD 
-0.3V to 6.0V
All Other Inputs 
-0.3V to VDD+0.3V
zInput Current, VDD 
20mA
zOutput Current, RESET 
20mA
zPower Dissipation, PD @ TA = 25°C
SOT-23 
0.25W SOT-89
0.5W SOT-25
0.25W
zOperating Junction Temperature Range 
-40°C ~ 125°C
zStorage Temperature Range 
-65°C ~ 125°C
zPackage Thermal Resistance
SOT-23, θJA |
250°C /W |
SOT-89, θJC |
100°C /W |
SOT-89, θJA |
300°C /W |
SOT-25, θJA |
250°C /W |
z Lead Temperature (Soldering, 5sec.) |
260°C |
Electrical Characteristics
(VDD = 3.0, unless specified)
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Parameter |
Symbol |
Test Conditions |
Min |
Typ |
Max |
Units |
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Operating VDD (VOUT) Range |
VDD |
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0.9 |
-- |
6 |
V |
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Supply Current |
IDD |
VDD = 1.5V ~ 5V, IOUT = 0 |
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3 |
-- |
µA |
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Reset Threshold |
VTH |
TA = 27°C |
-- |
Note1 |
-- |
V |
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Threshold Voltage Accuracy |
∆VTH |
TA = 27°C |
-- |
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2 |
% |
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VCC Drop to Reset Delay |
tRD |
Drop = -125mV |
-- |
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20 |
µS |
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Reset Active Time Out Period |
tRP |
VDD ≥ 1.02×VTH |
-- |
200 |
-- |
mS |
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Output Voltage |
VOL |
VDD < VTH, ISINK > 3.5mA |
-- |
0.4 |
-- |
V |
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RESET |
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Note1: 1.5V ~ 5V, step 0.1V |
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DS9808-01 January 2002 |
www.richtek-ic.com.tw |
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3 |
RT9808 |
Preliminary |
Measuring Circuit |
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(1) Detection Voltage |
(3) Output Transistor Current |
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VDD |
R (100kΩ) |
VDD |
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100kΩ |
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VDD |
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RT9808 |
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Oscilloscope |
RT9808 OUT |
CRT |
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V |
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OUT |
6V |
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VSS |
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P.G |
CL |
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VSS |
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(2) Current Consumption |
(4) Dynamic Response |
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A |
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VDD |
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VDD |
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VDD |
RT9808 |
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VDD |
RT9808 |
OUT |
V |
OUT |
V |
A |
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VSS |
V |
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VSS |
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VDS |
www.richtek-ic.com.tw |
DS9808-01 January 2002 |
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