Data Sheet
3-PIN MICROPROCESSOR RESET CIRCUIT
General Description
The AZ809A is a precision system supervisor and reset
circuit designed to monitor the power supplies in
microprocessor and digital system. It provides a reset
signal to the host processor during power-up, power-
down, and brownout conditions.
The AZ809A has an active-low RESET output, three
standard reset options are offered to support 5V, 3.3V,
and 3.0V system.Whenever the system supply voltage
declines below the internal fixed reset threshold, the
AZ809A asserts a reset signal and the reset signal
remains asserted for 240ms after V
CC
rises above the
threshold.
The AZ809A has a push-pull output, no external com-
ponents are required. The output is guaranteed to be in
the correct state at V
CC
level as low as 1V. The
AZ809A is optimized to reject fast transient glitches
on the VCC line. When the V
CC
is 3.3V, the supply
current consumption is about 6µA typically.
The IC is available in SOT-23 package.
AZ809A
Features
·
·
·
·
·
·
·
·
Precise Monitoring of 3.0V, 3.3V, and 5.0V Sup-
ply Voltages
140ms Minimum Reset Pulse Width
Active-low RESET Output
Push-Pull RESET Output
No External Components
Reset Valid Down to V
CC
=1.0V
Power Supply Fast Transient Immunity
Specified Over Full Temperature Range: -40 to
105
o
C
Applications
·
·
·
·
·
·
·
·
·
Microprocessor Systems
Portable/Battery-Powered Systems
Embedded Controllers
Automotive
Intelligent Instruments
Wireless Communication Systems
PDAs and Handheld Equipment
Set-Top Boxes
ADSL Modems
SOT-23
Figure 1. Package Type of AZ809A
Oct. 2010 Rev. 1. 3
1
BCD Semiconductor Manufacturing Limited
Data Sheet
3-PIN MICROPROCESSOR RESET CIRCUIT
Pin Configuration
N Package
(SOT-23)
AZ809A
2
VCC
3
1
RESET
GND
Figure 2. Pin Configuration of AZ809A (Top View)
Pin Description
Pin Number
1
2
Pin Name
GND
RESET
Ground pin
Active low output. The RESET is asserted LOW if V
CC
falls below the reset threshold
and remains LOW for the 240ms typical reset timeout period (140ms minimum) after
V
CC
exceeds the threshold
Power supply input voltage (3.0V, 3.3V, 5.0V)
Function
3
VCC
Oct. 2010 Rev. 1. 3
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BCD Semiconductor Manufacturing Limited
Data Sheet
3-PIN MICROPROCESSOR RESET CIRCUIT
Functional Block Diagram
AZ809A
VCC
3
Reset
Logic
+
Timer
2
RESET
GND
1
Oscillator
Reference
Voltage
Figure 3. Functional Block Diagram of AZ809A
Ordering Information
AZ809A
Circuit Type
-
E1: Lead Free
G1: Green
TR: Tape and Reel
Package
N: SOT-23
Reset Threshold:
L: 4.63V
S: 2.93V
R: 2.63V
Part Number
Lead Free
Green
AZ809ANLTR-E1 AZ809ANLTR-G1
AZ809ANSTR-E1 AZ809ANSTR-G1
AZ809ANRTR-E1 AZ809ANRTR-G1
Marking ID
Lead Free
Green
EH7
GH7
EH1
EH6
GH1
GH6
Packing
Type
Tape & Reel
Package
Temperature
Reset
Range
Threshold
4.63V
-40 to 105
o
C
2.93V
2.63V
SOT-23
BCD Semiconductor's Pb-free products, as designated with "E1" suffix in the part number, are RoHS compliant. Products with
"G1" suffix are available in green package.
Oct. 2010 Rev. 1. 3
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BCD Semiconductor Manufacturing Limited
Data Sheet
3-PIN MICROPROCESSOR RESET CIRCUIT
Absolute Maximum Ratings (Note 1)
Parameter
Supply Voltage
RESET
Input Current, VCC Pin
Output Current, RESET Pin
Rate of Rise, V
CC
Continuous Power Dissipation
Junction Temperature
Storage Temperature
Lead Temperature (Soldering, 10sec)
ESD (Human Body Model)
ESD (Machine Model)
T
J
T
STG
T
LEAD
Symbol
V
CC
Value
-0.3 to 6
-0.3 to V
CC
+0.3
20
20
100
320
150
-65 to 150
260
6000
400
Unit
V
V
mA
mA
V/µs
mW
o
AZ809A
C
o
C
o
C
V
V
Note 1: Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to
the device. These are stress ratings only, and functional operation of the device at these or any other conditions
beyond those indicated under "Recommended Operating Conditions" is not implied. Exposure to "Absolute Max-
imum Ratings" for extended periods may affect device reliability.
Recommended Operating Conditions
Parameter
Supply Voltage
Operating Ambient Temperature Range
Symbol
V
CC
T
A
Min
1
-40
Max
5.5
105
Unit
V
o
C
Oct. 2010 Rev. 1. 3
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BCD Semiconductor Manufacturing Limited
Data Sheet
3-PIN MICROPROCESSOR RESET CIRCUIT
Electrical Characteristics
(V
CC
is over the full voltage range, T
A
=-40
o
C to 105
o
C, unless otherwise noted.
Typical values at T
A
=25
o
C, V
CC
=5V for L device, V
CC
=3.3V for S device and V
CC
=3V for R device.)(Note 2)
Parameter
Input Voltage (V
CC
) Range
Symbol
V
CC
T
A
=0
o
C to 85
o
C
T
A
=-40 C to 105 C
L Devices
Supply Current
I
CC
R/S Devices
T
A
=-40
o
C to 85
o
C, V
CC
<5.5V
T
A
=-40
o
C to 105
o
C, V
CC
<5.5V
T
A
=-40
o
C to 85
o
C, V
CC
<3.6V
T
A
=-40
o
C to 105
o
C, V
CC
<3.6V
T
A
=25
o
C
T
A
=-40
o
C to 85
o
C
T
A
=-40
o
C to 105
o
C
Reset Threshold
V
TH
S Devices
T
A
=25
o
C
T
A
=-40
o
C to 85
o
C
T
A
=-40
o
C to 105
o
C
R Devices
T
A
=25
o
C
T
A
=-40
o
C to 85
o
C
T
A
=-40
o
C to 105
o
C
Reset Threshold
Temperature Coefficient
VCC to Reset Delay
Reset Active Timeout Period
T
A
=-40
o
C to 105
o
C
V
CC
=V
TH
to V
TH
-100mV
T
A
=-40
o
C to 85
o
C
T
A
=-40
o
C
V
OL
L Devices
to
R/S Devices V
CC
=V
TH
(min), I
SINK
=1.2mA
V
CC
=V
TH
(min), I
SINK
=3.2mA
V
CC
>V
TH
(max),
I
SOURCE
=500µA
V
CC
>V
TH
(max),
I
SOURCE
=800µA
105
o
C
140
100
0.3
0.4
0.3
0.8V
CC
V
CC
-
1.5
V
V
4.56
4.50
4.40
2.89
2.85
2.78
2.59
2.55
2.50
30
20
240
560
840
2.63
2.93
4.63
6
o
o
AZ809A
Conditions
Min
1.0
1.2
Typ
Max
5.5
5.5
Unit
V
7
11
12
10
11
4.70
4.75
4.86
2.96
3.00
3.08
2.66
2.70
2.76
ppm/
o
C
µs
ms
V
µA
L Devices
Low RESET Output Voltage
V
CC
>1.1V, I
SINK
=50µA
R/S Devices
High RESET Output Voltage
V
OH
L Devices
Note 2. Production testing done at T
A
=25
o
C. Over temperature specifications guaranteed by design only.
Oct. 2010 Rev. 1. 3
5
BCD Semiconductor Manufacturing Limited
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