AMS803 Datasheet, PDF (1/8 Pages) Advanced Monolithic Systems Ltd – Precision supply-voltage monitor

Features
z Precision supply-voltage monitor
- 4.63V (AMS803/09/10L)
- 4.26V (AMS803/09/10M)
- 3.08V (AMS803/09/10T)
- 2.93V (AMS803/09/10S)
- 2.63V (AMS803/09/10R)
- 2.32V (AMS803/09/10Z)
z 140ms(min) reset pulse width
z Push-Pull /RESET Output Configurations for
AMS809
z Push-Pull RESET Output Configurations for
AMS810
z Open-Drain /RESET output configuration for
AMS803
z 12µA Supply Current
z Guaranteed Reset(/Reset) Valid to V_CC = +1.0V
z Power Supply Transient Immunity
z No External Components
Ordering Information
Part Number
Package
AMS803XTE Lead free and Green SOT23-3
AMS809XTE Lead free and Green SOT23-3
AMS810XTE Lead free and Green SOT23-3
Note: “x” refers to voltage range, see below table.
AMS803/09/10
Description
The AMS803/09/10 are microprocessor (µP)
supervisory circuits used to monitor the power supplies
in µP and digital systems. They provide excellent circuit
reliability and low cost by eliminating external
components and adjustments when used with +3.3V,
+3.0V, or 2.5V powered circuits.
These circuits perform a single function: they assert
a reset signal whenever the VCC supply voltage declines
below a preset threshold, keeping it asserted for at least
140ms after VCC has risen above the reset threshold.
Reset thresholds suitable for operation with a variety of
supply voltages are available.
The AMS803 has an open-drain output stage,
while the AMS809/10 have push-pull outputs. The
AMS803’s open-drain /Reset output requires a pull-up
resistor that can be connected to a voltage higher than
V_CC. The AMS803/09 have an active-low /RESET
output while the AMS810 has an active-high RESET
output. The reset comparator is designed to ignore fast
transients on V_CC, and the outputs are guaranteed to be
in the correct logic state for V_CC down to 1V.
Low supply current makes the AMS803/09/10
ideal for use in portable equipment. The ICs are
available in 3 pin SOT23 packages.
Suffix: X—Monitored Voltage
X
L
Reset Threshold (V)
4.63
M
T
S
R
Z
4.26
3.08
2.93
2.63
2.32
Block Diagram
V_CC
+
-
V_RST
Reset Logic
and Timer
RESET
1
Advanced Monolithic Systems http://www.ams-semitech.com