DS1817R-20-U+ ,Active High 3.3V EconoResetFEATURES PIN ASSIGNMENT Automatically restarts a microprocessor after3power failureDALLASDS1817 M ..
DS1818 ,3.3V EconoReset with PushbuttonFEATURES PIN ASSIGNMENT • Improves Reliability of Processor Operation 3 o Temperature-Compensat ..
DS1818 ,3.3V EconoReset with PushbuttonPIN DESCRIPTION o Fixed 3.3V Reset Threshold TO-92 o 5%, 10%, and 20% Tolerance Versions 1 RS ..
DS1818-10 ,3.3V EconoReset with PushbuttonPIN DESCRIPTIONTO-921 RST Active Low Reset Output2 V Power SupplyCC3 GND GroundSOT-231 RST Active L ..
DS1818-10 ,3.3V EconoReset with PushbuttonFEATURES PIN ASSIGNMENT Automatically restarts a microprocessor after3power failure Monitors push ..
DS1818-5+ ,3.3V EconoReset with PushbuttonFEATURES PIN ASSIGNMENT • Improves Reliability of Processor Operation 3 o Temperature-Compensat ..
DXT3150-13 , NPN SURFACE MOUNT TRANSISTOR
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DXT3904-13 , NPN SURFACE MOUNT TRANSISTOR
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DS1817R-20/T&R-DS1817R-20-U+
Active High 3.3V EconoReset
FEATURESAutomatically restarts a microprocessor after
power failureMaintains reset for 150 ms after VCC returns
to an in-tolerance conditionReduces need for discrete componentsPrecision temperature-compensated voltage
reference and voltage sensorAccurate 5%, 10% or 20% power monitoring20% tolerance for use with 3.0-volt systemsLow-cost TO-92 or space saving surface
mount SOT-23 packages availablePush-pull active high outputOperating temperature -40°C to +85°C
PIN ASSIGNMENT
PIN DESCRIPTION
TO-92RSTActive High Reset Output
2 VCC Power Supply
3 GND Ground
SOT-23RSTActive High Reset Output
2 VCC Power Supply
3 GND Ground
DESCRIPTIONThe DS1817 EconoReset uses a precision temperature reference and comparator circuit to monitor the
status of the power supply (VCC). When an out-of-tolerance condition is detected, an internal power-fail
signal is generated which forces reset to the active state. When VCC returns to an in-tolerance condition,
the reset signal is kept in the active state for approximately 150 ms to allow the power supply and
processor to stabilize.
DS1817
Active High 3.3V EconoReset
TOP VIEW
SOT-23 PACKAGE
See Mech.
Drawings Section
On Website1 2 3
1 2 3
BOTTOM VIEW
TO-92 PACKAGE
See Mech.
Drawings Section
On Website
DALLAS
DS1817
Econo
Reset
DS1817
OPERATION - POWER MONITORThe DS1817 provides the function of detecting out-of-tolerance power supply conditions and warning a
processor based system of impending power failure. When VCC is detected as out-of-tolerance, the RST
signal is asserted. On power-up, RST is kept active for approximately 150 ms after the power supply has
reached the selected tolerance. This allows the power supply and microprocessor to stabilize before RST
is released.
BLOCK DIAGRAM (CMOS OUTPUT) Figure 1
APPLICATION EXAMPLE Figure 2
DS1817
TIMING DIAGRAM: POWER-UP Figure 3
TIMING DIAGRAM: POWER-DOWN Figure 4
DS1817
ABSOLUTE MAXIMUM RATINGS*Voltage on VCC Pin Relative to Ground -0.5V to +7.0V
Voltage on RST Relative to Ground -0.5V to 5VCC +0.5V
Operating Temperature -40°C to +85°C
Storage Temperature -55°C to +125°C
Soldering Temperature 260°C for 10 secondsThis is a stress rating only and functional operation of the device at these or any other conditions
above those indicated in the operation sections of this specification is not implied. Exposure to
absolute maximum rating conditions for extended periods of time may affect reliability.
RECOMMENDED DC OPERATING CONDITIONS (-40C to +85C)
PARAMETERSYMBOLMINTYPMAXUNITSNOTESSupply VoltageVCC0.05.5V1
DC ELECTRICAL CHARACTERISTICS (-40C to +85C; VCC=1.2V to 5.5V)
PARAMETERSYMBOLMINTYPMAXUNITSNOTESOutput Voltage @ 0-500 AVOHVCC
-0.5V
VCC
-0.1V
Output Current @ 2.4VIOH350A2
Output Current @ 0.4VIOL+10mA2
Operating Current VCC < 5.5ICC2835A3
VCC Trip Point (DS1817-5)VCCTP2.983.063.15V1
VCC Trip Point (DS1817-10)VCCTP2.802.882.97V1
VCC Trip Point (DS1817-20)VCCTP2.472.552.64V1
Output CapacitanceCOUT10pF
AC ELECTRICAL CHARACTERISTICS (-40C to +85C; VCC=1.2V to 5.5V)
PARAMETERSYMBOLMINTYPMAXUNITSNOTESRESET Active TimetRST100150250ms
VCC Detect to RSTtRPD25s
VCC Slew Rate
(VCCTP (MAX) to VCCTP (MIN))300s6
VCC Slew Rate
(VCCTP (MIN) to VCCTP (MAX))0ns
VCC Detect to RSTtRPU100150250ms4, 5
DS1817
NOTES:1. All voltages are referenced to ground.
2. Measured with VCC 2.7V.
3. Measured with RST output open.
4. Measured with 2.7V VCC 3.3V.
5. tR = 5 s.
6. The tF value is for reference in defining values for TRPD and should not be considered a requirement
for proper operation or use of the device.
PART MARKING CODES“A”, “B”, &“C” represent the Device Type.
810-DS1810
811 -DS1811
812 -DS1812
813 -DS1813
815 -DS1815
816 -DS1816
817 -DS1817
818 -DS1818
“D” represents the Device Tolerance.
A -5%
B -10%
C -15%
D -20%
SOT-23 PACKAGE
This datasheet has been :
www.ic-phoenix.com
Datasheets for electronic components.
