Diodes AZ809, AZ810 User Manual
Data Sheet
3-PIN MICROPROCESSOR RESET CIRCUITS AZ809/AZ810
General Description
The AZ809/810 microprocessor supervisory circuits
can be used to monitor the power supplies in microprocessor and digital systems. They provide a reset to the
microprocessor in power-up, power-down and brownout conditions. The function of the AZ809/810 is to
monitor the V
nal whenever this voltage declines below the factoryprogrammed reset threshold. The reset signal remains
asserted for 240ms after V
The AZ809 has an active-low RESET output, while
the AZ810 has an active-high RESET output. Seven
standard reset voltage options are available, suitable
for monitoring 3.0V, 3.3V and 5.0V supply voltages.
With a typical supply current of only 8
3.3V, the AZ809/810 are ideal for use in portable
equipment.
These ICs are available in SOT-23 package.
supply voltage, and assert a reset sig-
CC
rises above the threshold.
CC
μA when V
CC
is
Features
· Precise Monitoring of 3.0V, 3.3V and 5.0V Supply Voltages
· Improved Maxim MAX809/MAX810 Replacement
· 140ms Min. Reset Pulse Width
Active-low Reset Output (AZ809)
Active-high Reset Output (AZ810)
· No External Components
· Specified Over Full Temperature Range: -40 to
o
C
105
Applications
· Embedded Controllers
· Battery Operated Systems
· Intelligent Instruments
· Wireless Communication Systems
· PDAs and Handheld Equipment
SOT-23
Figure 1. Package Type of AZ809/810
Dec. 2012 Rev. 1. 4 BCD Semiconductor Manufacturing Limited
1
Data Sheet
3-PIN MICROPROCESSOR RESET CIRCUITS AZ809/AZ810
Pin Configuration
N Package
(SOT-23)
1
Figure 2. Pin Configuration of AZ809/810 (Top View)
Pin Description
Pin Number
AZ809 AZ810
1 1 GND Ground pin
2RESET
Pin Name Function
RESET is asserted LOW if V
the 240ms typical reset timeout period (140ms minimum) after V
threshold
2
V
CC
3
RESET/RESET
GND
falls below the reset threshold and remains LOW for
CC
exceeds the
CC
2 RESET RESET is asserted HIGH if V
33 V
CC
Power supply input voltage (3.0V, 3.3V, 5.0V)
falls below the reset threshold
CC
Dec. 2012 Rev. 1. 4 BCD Semiconductor Manufacturing Limited
2
Data Sheet
Reference
Voltage
Reset
Logic
+
Timer
Oscillator
1A LOW DROPOUT LINEAR REGULATOR AP2218
3-PIN MICROPROCESSOR RESET CIRCUITS AZ809/AZ810
Functional Block Diagram
CC
3
1
Figure 3. Functional Block Diagram of AZ809/810
V
GND
Ordering Information
AZ8XX -
2
RESET/RESET
Circuit Type
09: AZ809
10: AZ810
Package
N: SOT-23
E1: Lead Free
G1: Green
TR: Tape and Reel
Detect Voltage:
L: 4.63V S: 2.93V
T: 3.08V
R: 2.63V
Dec. 2012 Rev. 1. 4 BCD Semiconductor Manufacturing Limited
3
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