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PDF DS1819 Data sheet ( Hoja de datos )
| Número de pieza | DS1819 | |
| Descripción | (DS1814 / DS1819) 5V and 3.3V MicroMonitor | |
| Fabricantes | Dallas Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de DS1819 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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DS1814/DS1819
5V and 3.3V MicroMonitor
FEATURES
§ Halts and restarts an out-of-control
microprocessor
§ Holds microprocessor in check during power
transients
§ Automatically restarts microprocessor after
power failure
§ Monitors pushbutton for external override
§ Accurate 5%, 10%, or 20% (3V only)
microprocessor power monitoring
§ Eliminates the need for discrete components
§ 20% tolerance for use with 3.0V systems
§ Pin- and function-compatible with the
MAX823/24/25 products
§ Low cost SOT-23-5 package
§ Industrial temperature range: -40°C to +85°C
DEVICE
RST RST
DS181xA
X
DS181xB
XX
DS181xC
XX
x = "DS1814" for 5V devices
x = "DS1819" for 3V devices
PBRST
X
X
WD
X
X
PIN ASSIGNMENT
32 1
45
SOT-23-5 PACKAGE
See Mech. Drawing
PIN DESCRIPTION
DS181xA
1 RST
2 GND
Active Low Reset Output
Ground
3 PBRST Pushbutton Reset Input
4 ST
5 VCC
Strobe Input
Power Supply
DS181xB
1 RST
2 GND
3 RST
4 ST
5 VCC
Active Low Reset Output
Ground
Active High Reset Output
Strobe Input
Power Supply
DS181xC
1 RST
2 GND
3 RST
Active Low Reset Output
Ground
Active High Reset Output
4 PBRST Pushbutton Reset Input
5 VCC
Power Supply
DESCRIPTION
The DS1814 5-Volt MicroMonitor and the DS1819 3.3V MicroMonitor monitor three vital conditions for
a microprocessor: power supply, software execution, and external override. First, a precision temperature-
compensated reference and comparator circuit monitor the status of VCC. When an out-of-tolerance
condition occurs, an internal power-fail signal is generated which forces the reset(s) to an active state.
When VCC returns to an in-tolerance condition, the reset signal is kept in the active state for a minimum of
140ms to allow the power supply and processor to stabilize.
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TIMING DIAGRAM: POWER-UP Figure 8
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DS1814/DS1819
RST VALID TO 0 VOLTS VCC Figure 9
OUTPUT VALID CONDITIONS
The RST output uses a push-pull output which can maintain a valid output down to 1.0V VCC. To sink
current below 1.0V a resistor can be connected form RST to Ground (see Figure 9.) This arrangement
will maintain a valid value on RST during both power-up and -down but will draw current when RST is
in the high state. A value of about 100kW should be adequate in most situations. The output with a
resistor pull-down can maintain a valid reset down to VCC equal to 0V.
5 of 8
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet DS1819.PDF ] | |
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