AMS803/09/10
Pin Configuration
AMS803/09/10XT
1
GND
VCC 3
2
RESET
SOT23-3
Pin Description
Pin
Type
Description
Supply Voltage.
Reset is asserted when V
CC
drops below the Reset Threshold Voltage (V
RST
). Reset
remains asserted until V
CC
rises above V
RST
and keep asserted for the duration of the Reset Timeout
Period (t
RS
) once V
CC
rises above V
RST
.
Ground
Active-Low Reset Output (Push-Pull).
It goes low when Vcc is below the reset threshold. It remains
low for about 200ms after Vcc rises above the reset threshold (V
RST
).
VCC
-
GND
-
RESET
O
Functional Description
Reset Output
A microprocessor (µP) reset input starts the
µP
in a known state. Whenever the
µP
is in an unknown state, it should be held in
reset. The supervisory circuits assert reset during power-up and prevent code execution errors during power-down or brownout
conditions.
On power-up, once Vcc reaches about 1.0V, /RESET is a guaranteed logic low of 0.4V or less. As Vcc rises, /RESET stays low.
When Vcc rises above the reset threshold, an internal timer releases /RESET after about 200ms. /RESET pulses low whenever
Vcc drops below the reset threshold, i.e. brownout condition. If brownout occurs in the middle of a previously initiated reset pulse,
guaranteed to be 0.4V or less until Vcc drops below 1.0V. Reset
Timing Diagram
shows the timing relationship.
Advanced Monolithic Systems
2
http://www.ams-semitech.com
AMS [ Advanced Monolithic Systems Ltd ]
