DS1811- ,5V EconoReset with Open Drain OutputFEATURES PIN ASSIGNMENT Automatically restarts a microprocessor after3power failureDALLASDS1811 M ..
DS1811-10 ,5V EconoReset with Open Drain OutputFEATURES PIN ASSIGNMENT Automatically restarts a microprocessor after3power failure Maintains res ..
DS1811-15 ,5V EconoReset with Open Drain OutputPIN DESCRIPTIONTO-921 RST Active Low Reset Output2 V Power SupplyCC3 GND GroundSOT-231 RST Active L ..
DS1811-15+ ,5V EconoReset with Open Drain OutputFEATURES PIN ASSIGNMENT Automatically restarts a microprocessor after3power failureDALLASDS1811 M ..
DS1811R-5-U+ ,5V EconoReset with Open Drain OutputPIN DESCRIPTIONTO-921 RST Active Low Reset Output2 V Power SupplyCC3 GND GroundSOT-231 RST Active L ..
DS1812-10 ,5V EconoReset with Active High Push-Pull OutputPIN DESCRIPTIONTO-921 RST Active High Reset Output2 V Power SupplyCC3 GND GroundSOT-231 RST Active ..
DWC010 ,Silicon Epitaxial Planar Type Ultrahigh-Speed Switching DiodeAbsolute Maximum Ratings at Ta = 25˚CPl arameter Ss ymbo Cs ondition Rt ating UniPV eak Reverse Vol ..
DWR-SJS-TU2-1 , Power LED
DXT3150-13 , NPN SURFACE MOUNT TRANSISTOR
DXT3904 , TECHNICAL SPECIFICATIONS OF NPN EPITAXIAL PLANAR TRANSISTOR
DXT3904-13 , NPN SURFACE MOUNT TRANSISTOR
DXT5551 , TECHNICAL SPECIFICATIONS OF NPN EPITAXIAL PLANAR TRANSISTOR
DS1811-DS1811-
5V EconoReset with Open Drain Output
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 sensorLow-cost TO-92 or space saving SOT-23
packages availableEfficient open-drain output with internal
5.5 k pull-up resistorOperating temperature -40°C to +85°C
PIN ASSIGNMENT
PIN DESCRIPTION
TO-92RST Active Low Reset Output
2 VCC Power Supply
3 GND Ground
SOT-23RST Active Low Reset Output
2 VCC Power Supply
3 GND Ground
DESCRIPTIONThe DS1811 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
DS1811
5V EconoReset with Open Drain Output
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
DS1811
Econo
Reset
DS1811
OPERATION - POWER MONITORThe DS1811 provides the functions 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 (OPEN-DRAIN OUTPUT) Figure 1
APPLICATION EXAMPLE Figure 2
DS1811
TIMING DIAGRAM: POWER-UP Figure 3
TIMING DIAGRAM: POWER-DOWN Figure 4
DS1811
ABSOLUTE MAXIMUM RATINGS*Voltage on VCC Pin Relative to Ground -0.5V to +7.0V
Voltage on RST Relative to Ground -0.5V to VCC +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 Current @ 0.4 voltsIOL+10mA2, 3
Operating Current VCC < 5.5 voltsICC3040A4
VCC Trip Point (DS1811-5)VCCTP4.504.624.75V1
VCC Trip Point (DS1811-10)VCCTP4.254.354.49V1
VCC Trip Point (DS1811-15)VCCTP4.004.134.24V1
Internal Pull-Up ResistorRP3.55.57.5k
Output CapacitanceCOUT10pF
AC ELECTRICAL CHARACTERISTICS (-40C to +85C; VCC=1.2V to 5.5V)
PARAMETERSYMBOLMINTYPMAXUNITSNOTESRESET Active TimetRST100150300ms
VCC Detect to RSTtRPD25s
VCC Slew Rate
(VCCTP (MAX) to VCCTP (MIN))300s
VCC Slew Rate
(VCCTP (MIN) to VCCTP (MAX))0ns
VCC Detect to RSTtRPU100150300ms5
DS1811
NOTES:1. All voltages are referenced to ground.
2. Measured with VCC 2.7 volts.
3. A 1kexternal resistor may be required in some applications for proper operation of the
microprocessor reset control circuit.
4. Measured with RST output open.
5. tR = 5 s.
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%
This datasheet has been :
www.ic-phoenix.com
Datasheets for electronic components.
