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IMP809 Datasheet(PDF) 5 Page - IMP, Inc

Part # IMP809
Description  3-Pin Microcontroller Power Supply Supervisor
PDF  7 Pages
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Manufacturer  IMP [IMP, Inc]
Direct Link  http://www.ds-imp.com.cn/index.asp
Logo IMP - IMP, Inc

IMP809 Datasheet(HTML) 5 Page - IMP, Inc

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IMP809, IMP8
IMP809, IMP81100
Bi-directional Reset Pin Interfacing
The IMP809/810 can interface with µP/µC bi-directional reset
pins by connecting a 4.7k
Ω resistor in series with the
IMP809/810 reset output and the µP/µC bi-directional reset pin.
Negative VCC Transients
The IMP809/810 protect µPs from brownouts and low VCC. Short
duration transients of 100mV amplitude and 20µs or less duration
typically do not cause a false RESET.
To ensure logic inputs connected to the IMP809 RESET pin are in
a known state when VCC is under 1.1V, a 100kΩ pull-down
resistor at RESET is needed. The value is not critical. A pull-up
resistor to VCC is needed with the IMP810.
Power
Supply
IMP810
VCC
GND
RESET
100k
Ω
809/10_05.eps
Valid Reset with VCC under 1.1V
Power
Supply
IMP809
VCC
GND
RESET
100k
Ω
809/10_04.eps
Power
Supply
IMP809
VCC
GND
GND
RESET
4.7k
Ω
809/10_06.eps
Bi-directional I/O Pin
(Example: 68HC11)
BUF
Buffered
RESET
µC or µP
RESET
Input
Application Information
Figure 2. RESET Valid with VCC Under 1.1V
Figure 3. RESET Valid with VCC Under 1.1V
Figure 4. Bi-directional Reset Pin Interfacing



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