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PDF SP809 Data sheet ( Hoja de datos )
| Número de pieza | SP809 | |
| Descripción | 3 Pin Microprocessor Supervisor Circuit | |
| Fabricantes | Exar | |
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Hay una vista previa y un enlace de descarga de SP809 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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February 2011
SP809 / SP810
3 Pin Microprocessor Supervisor Circuit
Rev. 2.0.0
GENERAL DESCRIPTION
The SP809/SP810 are low power
microprocessor (μP) supervisory circuits used
to monitor power supplies in μP and digital
systems.
They provide applications with benefits of
circuit reliability and low cost by eliminating
external components. If the VCC supply
voltage falls below preset threshold then a
reset signal is asserted for at least 140ms
after VCC has risen above the reset threshold.
Both the SP809 and SP810 were designed with
a reset comparator to help identify invalid
signals, which last less than 140ms. The only
difference between them is that they have an
active-low RESET output and active-high
RESET output, respectively. Low supply
current (1μA) makes SP809/SP810 ideal for
portable equipment.
The devices are available in 3 pin SOT-23
package.
APPLICATIONS
• Portable Electronic Devices
• Electrical Power Meters
• Digital Still Cameras
• µP Power Monitoring
FEATURES
• Ultra Low Supply Current 1µA (typ)
• Guaranteed Reset valid to VCC = 0.9V
• 140ms Power-On Reset Pulse Width
• Internally Fixed Threshold
2.3V, 2.6V, 2.9V, 3.1V, 4.4V, 4.6V
• 1.5% Voltage Threshold Tolerance
• 3 Pin SOT-23 Package
Part Number
SP809N
SP809
SP810
Output Type
Open Drain Active Low
Push-Pull Low
Push-Pull Active High
TYPICAL APPLICATION DIAGRAM
Fig. 1: SP809 / SP810 Application Diagram
Exar Corporation
48720 Kato Road, Fremont CA 94538, USA
www.exar.com
Tel. +1 510 668-7000 – Fax. +1 510 668-7001
1 page  
SP809 / SP810
3 Pin Microprocessor Supervisor Circuit
TYPICAL PERFORMANCE CHARACTERISTICS
All data taken at TA = 25°C, unless otherwise specified - Schematic and BOM from Application Information section of this
datasheet.
Fig. 4: Supply Current versus Temperature
Fig. 5: Power-Down Reset Delay versus Temperature
Fig. 6: Power-Down Reset Delay versus Temperature
Fig. 7: Power-Down Reset Delay versus Temperature
Fig. 8: Normalized Reset Threshold versus Temperature
Fig. 9: Power-Up Reset Time-out versus Temperature
© 2011 Exar Corporation
5/8
Rev. 2.0.0
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet SP809.PDF ] | |
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