ASM809JEUR-T ALSC [Alliance Semiconductor Corporation], ASM809JEUR-T Datasheet - Page 3

• Manufacturer Part Number: ASM809JEUR-T
• Description: 3 Pin Microcontroller Power Supply Supervisor
• Manufacturer: ALSC [Alliance Semiconductor Corporation]

October 2003
rev 1.0
Application Information
Negative V
The ASM809/810 protect µPs from brownouts and low V
Short duration transients of 100mV amplitude and 20µs or
less duration typically do not cause a false RESET.
Valid Reset with V
When V
the ASM809 RESET pin are in a known state, a 100kΩ pull-
down resistor is needed at RESET . The value of the resistor
is not critical. A 100kΩ pull-up resistor to V
needed with the ASM810.
Power Supply
Power Supply
Figure 3: RESET valid with V
Figure 2: RESET valid with V
CC
is under 1.1V, to ensure logic inputs connected to
CC
Transients
CC
ASM810
ASM809
V
GND
V
GND
under 1.1V
CC
CC
RESET
RESET
CC
CC
Notice: The information in this document is subject to change without notice
3 Pin Microcontroller Power Supply Supervisor
under 1.1V
under 1.1V
100kΩ
100kΩ
CC
at RESET is
CC
.
Bidirectional Reset Pin Interfacing
The ASM809/810 can interface with µP / µC bi-directional
reset pins by connecting a 4.7kΩ resistor in series with the
ASM809/810 reset output and the µP/µC bi-directional reset
pin.
Power supply
Figure 4: Bidirectional Reset Pin Interfacing
ASM809
V
GND
CC
RESET
ASM809, ASM810
Bi-directional I/O Pin
4.7kΩ
RESET
Input
BUF
µC or µP
GND
3 of 10
Buffered
RESET