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PDF IMP810 Data sheet ( Hoja de datos )
| Número de pieza | IMP810 | |
| Descripción | 3-Pin Microcontroller Power Supply Supervisor | |
| Fabricantes | IMP Inc | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de IMP810 (archivo pdf) en la parte inferior de esta página. Total 7 Páginas | ||
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IMP809, IMP810
POWER MANAGEMENT
3-Pin Microcontroller
Power Supply Supervisor
The IMP809/IMP810 are 3.0V, 3.3V and 5.0V power supply supervisor cir-
cuits optimized for low-power microprocessor (µP), microcontroller (µC)
and digital systems. The IMP809/810 are improved drop-in replacements
for the Maxim MAX809/810 and feature 60% lower supply current.
A reset signal is issued if the power supply voltage drops below a preset
reset threshold and is asserted for at least 140ms after the supply has
risen above the reset threshold. The IMP809 has an active-low RESET
output that is guaranteed to be in the correct state for VCC down to 1.1V.
The IMP810 has an active-high RESET output. The reset comparator is
designed to ignore fast transients on VCC.
Low supply current makes the IMP809/IMP810 ideal for use in portable
and battery operated equipment. The IMP809/IMP810 are available in a
compact 3-pin SOT23 package.
Six voltage thresholds are available to support 3V to 5V systems:
Reset Threshold
Suffix
Voltage (V)
L 4.63
M 4.38
J 4.00
T 3.08
S 2.93
R 2.63
Key Features
x Improved Maxim MAX809/MAX810 replacement
— Lower supply current…6µA
— 80% lower maximum supply current
x Monitor 5V, 3.3V and 3V supplies
x 140ms min. reset pulse width
x Active-low reset valid with 1.1V supply
(IMP809)
x Small 3-pin SOT-23 package
x No external components
x Specified over full temperature range
— – 40°C to 105°C
Applications
x Embedded controllers
x Battery operated systems
x Intelligent instruments
x Wireless communication systems
x PDAs and handheld equipment
Block Diagrams
VCC
VCC
IMP809
(IMP810)
RESET
(RESET)
GND
IMP, Inc.
VCC
µP
RESET
Input
GND
809/10_01.eps
San Jose, CA
408-432-9100/www.impweb.com
1 page  
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.
IMP809, IMP810
Application Information
Valid Reset with VCC under 1.1V
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
VCC
IMP809
RESET
GND
100kΩ
Power
Supply
VCC
IMP810
RESET
GND
100kΩ
809/10_04.eps
Figure 2. RESET Valid with VCC Under 1.1V
Bi-directional Reset Pin Interfacing
The IMP809/810 can interface with µP/µC bi-directional reset
pins by connecting a 4.7kΩ resistor in series with the
IMP809/810 reset output and the µP/µC bi-directional reset pin.
VCC
809/10_05.eps
Figure 3. RESET Valid with VCC Under 1.1V
BUF
Buffered
RESET
Power
Supply
IMP809
4.7kΩ
RESET
µC or µP
RESET
Input
GND
GND
Bi-directional I/O Pin
(Example: 68HC11)
809/10_06.eps
Figure 4. Bi-directional Reset Pin Interfacing
5
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet IMP810.PDF ] | |
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