BCD AZ809ANLTR-E1 3-pin microprocessor reset circuit Datasheet

Data Sheet
3-PIN MICROPROCESSOR RESET CIRCUIT
AZ809A
General Description
Features
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, powerdown, 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 VCC rises above the
threshold.
·
·
Precise Monitoring of 3.0V, 3.3V, and 5.0V Supply Voltages
140ms Minimum Reset Pulse Width
Active-low RESET Output
Push-Pull RESET Output
No External Components
Reset Valid Down to VCC=1.0V
Power Supply Fast Transient Immunity
Specified Over Full Temperature Range: -40 to
105oC
Applications
The AZ809A has a push-pull output, no external components are required. The output is guaranteed to be in
the correct state at VCC level as low as 1V. The
AZ809A is optimized to reject fast transient glitches
on the VCC line. When the VCC is 3.3V, the supply
current consumption is about 6µA typically.
·
·
·
·
·
·
·
·
·
The IC is available in SOT-23 package.
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
BCD Semiconductor Manufacturing Limited
1
Data Sheet
3-PIN MICROPROCESSOR RESET CIRCUIT
AZ809A
Pin Configuration
N Package
(SOT-23)
VCC
2
RESET
1
GND
3
Figure 2. Pin Configuration of AZ809A (Top View)
Pin Description
Pin Number
Pin Name
1
GND
2
RESET
3
VCC
Function
Ground pin
Active low output. The RESET is asserted LOW if VCC falls below the reset threshold
and remains LOW for the 240ms typical reset timeout period (140ms minimum) after
VCC exceeds the threshold
Power supply input voltage (3.0V, 3.3V, 5.0V)
Oct. 2010 Rev. 1. 3
BCD Semiconductor Manufacturing Limited
2
Data Sheet
3-PIN MICROPROCESSOR RESET CIRCUIT
AZ809A
Functional Block Diagram
VCC
GND
Reset
Logic
+
Timer
3
2
RESET
1
Oscillator
Reference
Voltage
Figure 3. Functional Block Diagram of AZ809A
Ordering Information
AZ809A
E1: Lead Free
G1: Green
Circuit Type
TR: Tape and Reel
Reset Threshold:
L: 4.63V
S: 2.93V
R: 2.63V
Package
N: SOT-23
Package
SOT-23
Temperature
Reset
Range
Threshold
o
-40 to 105 C
4.63V
Part Number
Lead Free
Green
AZ809ANLTR-E1 AZ809ANLTR-G1
Marking ID
Lead Free
Green
EH7
GH7
2.93V
AZ809ANSTR-E1 AZ809ANSTR-G1
EH1
GH1
2.63V
AZ809ANRTR-E1 AZ809ANRTR-G1
EH6
GH6
Packing
Type
Tape & Reel
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
BCD Semiconductor Manufacturing Limited
3
Data Sheet
3-PIN MICROPROCESSOR RESET CIRCUIT
AZ809A
Absolute Maximum Ratings (Note 1)
Parameter
Symbol
Value
Unit
VCC
-0.3 to 6
V
-0.3 to VCC+0.3
V
Input Current, VCC Pin
20
mA
Output Current, RESET Pin
20
mA
Rate of Rise, VCC
100
V/µs
Continuous Power Dissipation
320
mW
o
Supply Voltage
RESET
Junction Temperature
TJ
150
Storage Temperature
TSTG
-65 to 150
oC
TLEAD
260
oC
ESD (Human Body Model)
6000
V
ESD (Machine Model)
400
V
Lead Temperature (Soldering, 10sec)
C
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 Maximum Ratings" for extended periods may affect device reliability.
Recommended Operating Conditions
Parameter
Supply Voltage
Operating Ambient Temperature Range
Symbol
Min
Max
VCC
1
5.5
V
TA
-40
105
o
Oct. 2010 Rev. 1. 3
Unit
C
BCD Semiconductor Manufacturing Limited
4
Data Sheet
3-PIN MICROPROCESSOR RESET CIRCUIT
AZ809A
Electrical Characteristics
(VCC is over the full voltage range, TA=-40oC to 105oC, unless otherwise noted.
Typical values at TA=25oC, VCC=5V for L device, VCC=3.3V for S device and VCC=3V for R device.)(Note 2)
Parameter
Input Voltage (VCC) Range
Symbol
VCC
Conditions
Min
TA=0oC to 85oC
o
o
TA=-40 C to 105 C
L Devices
Supply Current
ICC
L Devices
R Devices
7
6
TA
=-40oC
to
4.63
4.50
10
4.70
4.86
TA=25 C
2.89
TA=-40oC to 85oC
2.85
3.00
TA=-40oC to 105oC
2.78
3.08
TA=25oC
2.59
TA
=-40oC
to
2.93
2.63
2.96
2.55
2.70
o
2.50
2.76
TA=-40 C to 105 C
V
2.66
85oC
o
µA
4.75
4.40
o
V
11
4.56
85oC
Unit
11
12
TA=-40oC to 105oC, VCC<3.6V
o
S Devices
5.5
TA=-40 C to 85 C, VCC<3.6V
TA=-40 C to 105 C
VTH
1.2
o
o
Reset Threshold
5.5
TA=-40oC to 105oC, VCC<5.5V
TA=25oC
Max
1.0
TA=-40oC to 85oC, VCC<5.5V
o
R/S Devices
Typ
Reset Threshold
Temperature Coefficient
TA=-40oC to 105oC
30
ppm/oC
VCC to Reset Delay
VCC=VTH to VTH-100mV
20
µs
Reset Active Timeout Period
TA=-40oC to 85oC
140
TA=-40oC to 105oC
R/S Devices VCC=VTH(min), ISINK=1.2mA
100
Low RESET Output Voltage
VOL
L Devices
VOH
L Devices
VCC>VTH(max),
ISOURCE=800µA
840
0.4
VCC>1.1V, ISINK=50µA
High RESET Output Voltage
560
ms
0.3
VCC=VTH(min), ISINK=3.2mA
V >V (max),
R/S Devices CC TH
ISOURCE=500µA
240
V
0.3
0.8VCC
VCC1.5
V
Note 2. Production testing done at TA=25oC. Over temperature specifications guaranteed by design only.
Oct. 2010 Rev. 1. 3
BCD Semiconductor Manufacturing Limited
5
Data Sheet
3-PIN MICROPROCESSOR RESET CIRCUIT
AZ809A
Typical Performance Characteristics
12
No Load
340
Power-up Reset Timeout Period (ms)
11
10
VCC=5V
Supply Current (µA)
9
8
7
VCC=3.3V
6
5
4
3
2
VCC=1V
1
0
-40.0
-20.0
0.0
20.0
40.0
60.0
80.0
100.0
320
300
280
260
240
220
200
-40.0
120.0
-20.0
0.0
o
60.0
80.0
100.0
120.0
Figure 5. Power-up Reset Timeout vs. Temperature
240
1.004
VCC=VTH to VTH-VOD
1.003
200
180
Normalized Threshold
Power-Down Reset Delay (µs)
40.0
Temperature ( C)
Figure 4. Supply Current vs. Temperature
220
20.0
o
Temperature ( C)
160
140
VOD=10mV
120
100
VOD=20mV
80
60
VOD=100mV
VOD=200mV
40
20
-20.0
0.0
20.0
40.0
1.001
1.000
0.999
0.998
0
-40.0
1.002
60.0
80.0
100.0
0.997
-40.0
120.0
o
-20.0
0.0
20.0
40.0
60.0
80.0
100.0
120.0
o
Temperature ( C)
Temperature ( C)
Figure 7. Normalized Reset Threshold vs. Temperature
Figure 6. Power-down Reset Delay vs. Temperature
Oct. 2010 Rev. 1. 3
BCD Semiconductor Manufacturing Limited
6
Data Sheet
3-PIN MICROPROCESSOR RESET CIRCUIT
AZ809A
Typical Performance Characteristics (Continued)
400
400
Maximum Transient Duration (µs)
360
Maximum Transient Duration (µs)
L Device
320
280
240
200
160
Reset Occurs
above the Curve
120
80
S Device
320
280
240
200
160
Reset Occurs
above the Curve
120
80
40
40
0
360
0
10
2
100
2
1000
10
100
1000
Reset Comparator Overdrive VTH-VCC (mV)
Reset Comparator Overdrive VTH-VCC (mV)
Figure 8. Maximum Transient Duration NOT Causing
Figure 9. Maximum Transient Duration NOT Causing
a Reset Pulse vs. Reset Comparator Overdrive
a Reset Pulse vs. Reset Comparator Overdrive
400
Maximum Transient Duration (µs)
360
R Device
320
280
240
200
160
Reset Occurs
above the Curve
120
80
40
0
2
10
100
1000
Reset Comparator Overdrive VTH-VCC (mV)
Figure 10. Maximum Transient Duration NOT Causing
a Reset Pulse vs. Reset Comparator Overdrive
Oct. 2010 Rev. 1. 3
BCD Semiconductor Manufacturing Limited
7
Data Sheet
3-PIN MICROPROCESSOR RESET CIRCUIT
AZ809A
Operating Diagram
VCC
VTH
VCC (min)
Time
RESET
20µs
Typical
240ms
Typical
240ms
Typical
Reset Active
Timeout Period
Output
Undefined
Time
The AZ809A asserts a reset signal LOW whenever the VCC supply voltage is below the threshold
voltage and remains asserted for 240ms typically after the VCC has risen above the threshold.
Figure 11. Reset Timing Diagram of AZ809A
Application Information
Valid RESET with VCC under 1.0 V
The AZ809A RESET output is valid to VCC=1.0V.
Below this voltage, the output becomes an open circuit
and doesn't sink current. Therefore, high-impedance
CMOS logic input connected to RESET can drift to
undetermined voltages.
VCC
AZ809A
To ensure that the AZ809A RESET is in a known state
when VCC is under 1.0V, a 100KΩ pull-down resistor
between the RESET pin and GND is recommended to
discharge stray capacitances and maintain the output
low.
RESET
GND
R1
100kΩ
Figure 12. RESET Valid to VCC=0V
Oct. 2010 Rev. 1. 3
BCD Semiconductor Manufacturing Limited
8
Data Sheet
3-PIN MICROPROCESSOR RESET CIRCUIT
AZ809A
Application Information (Continued)
Negative Going VCC Transient
The AZ809A is optimized to immune fast negativegoing transients or glitches on the VCC line, and the
sensitivity depends on the duration of the transient and
the magnitude of the undershoot below the reset
threshold (reset comparator overdrive). Figure 13
shows the maximum pulse width of a negative-going
VCC transient that will not cause a reset pulse. As the
magnitude of the transient increases (goes farther
below the reset threshold), the maximum allowable
pulse width decreases. Any combination of duration
and overdrive that lies under the curve will not
generate a reset signal, typically, a VCC transient that
goes 100mV below the reset threshold and lasts about
20µs or less will not cause a reset pulse.
400
VCC
Maximum Transient Duration (µs)
360
VTH
320
Overdrive
280
240
Duration
200
160
Reset Occurs
above the Curve
120
80
40
0
2
10
100
1000
Reset Comparator Overdrive VTH-VCC (mV)
A 0.1µF bypass capacitor mounted as close as possible
to the VCC pin will provide additional transient
rejection.
Figure 13. Maximum Transient Duration NOT Causing
a Reset Pulse vs. Reset Comparator Overdrive
Typical Application
VCC
VCC
VCC
AZ809A
Microprocessor
RESET
RESET
GND
GND
Figure 14. Typical Application of AZ809A
Oct. 2010 Rev. 1. 3
BCD Semiconductor Manufacturing Limited
9
Data Sheet
3-PIN MICROPROCESSOR RESET CIRCUIT
AZ809A
Mechanical Dimensions
SOT-23
3.0 °
7.0°
R0.100(0.004)
0.900(0.035)
1.100(0.043)
7.0°
0.0°~10.0°
0.020(0.001)
0.100(0.004) 0.200(0.008)MIN
2.800(0.110)
3.000(0.118)
0.550(0.022)REF
0.080(0.003)
0.150(0.006)
1.200(0.047)
1.400(0.055)
2.300(0.091)
2.500(0.098)
0.920(0.036)
0.980(0.039)
0.100(0.004) GAUGE PLANE
4×R0.100(0.004)
0.500(0.020)
0.700(0.028)
2.0°
1.050(0.041)REF
Unit: mm(inch)
0.390(0.015)
0.450(0.018)
1.900(0.075)REF
Oct. 2010 Rev. 1. 3
BCD Semiconductor Manufacturing Limited
10
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