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PDF DS1818 Data sheet ( Hoja de datos )
| Número de pieza | DS1818 | |
| Descripción | 3.3V EconoReset | |
| Fabricantes | Dallas Semiconductor | |
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DS1818
3.3V EconoReset with Pushbutton
FEATURES
Automatically restarts a microprocessor after
power failure
Monitors pushbutton for external override
Maintains reset for 150 ms after VCC returns
to an in-tolerance condition
Reduces need for discrete components
Precision temperature-compensated voltage
reference and voltage sensor
Accurate 5%, 10% or 20% power monitoring
Low-cost TO-92 or space saving surface
mount SOT-23 packages available
Efficient open-drain output with internal
5.5 kΩ=pull-up resistor
Operating temperature -40°C to +85°C
PIN ASSIGNMENT
3
12
SOT-23 PACKAGE
123
123
TO-92 PACKAGE
See Mech.
Drawings Section
PIN DESCRIPTION
TO-92
1 RST
2 VCC
3 GND
Active Low Reset Output
Power Supply
Ground
SOT-23
1 RST
2 VCC
3 GND
Active Low Reset Output
Power Supply
Ground
DESCRIPTION
The DS1818 EconoReset uses a precision temperature-compensated 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.
The DS1818 also monitors a pushbutton on the reset output. If the reset line is pulled low, a reset is
generated upon release and the DS1818 output will be held in reset output low for typically 150 ms.
1 of 5
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NOTES:
1. All voltages are referenced to ground.
DS1818
2. wMwwe.DasautarSehdeewt4Uit.hcoVm CC ≥ 2.7V.
3. A 1 kΩ external pull-up resistor may be required in some applications for proper operation of the
microprocessor reset control circuit.
4. Measured with RST output open.
5. Measured with 2.7V ≤ VCC ≤ 3.3V.
6. tR = 5 µs.
7. VOH and IOH are a function of the value of RP and the associated output load conditions.
8. 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%
5 of 5
5 Page | ||
| Páginas | Total 5 Páginas | |
| PDF Descargar | [ Datasheet DS1818.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| DS1810 | 5V EconoReset | Dallas Semiconductor |
| DS1811 | 5V EconoReset | Dallas Semiconductor |
| DS1812 | 5V EconoReset | Dallas Semiconductor |
| DS1813 | 5V EconoReset | Dallas Semiconductor |
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