Analog Microelectronics, Inc.
AME8500 / 8501 |
Micropower μP Reset Family |
n General Description
The AME8500 family allows the user to customize the CPU reset function without any external components. The user has a large choice of reset voltage thresholds, reset time intervals, and output driver configurations, all of which are preset at the factory. Each wafer is trimmed to the customer's specifications.
These circuits monitor the power supply voltage of μP based systems. When the power supply voltage drops below the voltage threshold a reset is asserted immediately (within an interval TD1). The reset remains asserted after the supply voltage rises above the voltage threshold for a time interval, TD2 . The reset output may be either active high (RESET) or active low (RESETB). The reset output may be configured as either push/pull or open drain. The state of the reset output is guaranteed to be correct for supply voltages greater than 1V.
The AME8501 includes all the above functionality plus an overtemperature shutdown function. When the ambient temperature exceeds 800C a reset is asserted and remains asserted until the temperature falls below 600C.
Space saving SOT23 packages and micropower quiescent current (<3.0μA) make this family a natural for portable battery powered equipment.
n Features
lSmall packages: SOT-23, SOT-89
l11 voltage threshold options
lTight voltage threshold tolerance ---±1.50%
l4 reset interval options
l4 output configuration options
lWide temperature range -------- -40oC to 85oC
lLow temperature coefficient --- 100ppm/oC (max)
lLow quiescent current < 3.0μA
lThermal shutdown option (AME8501)
n Applications
lPortable electronics
lPower supplies
lComputer peripherals
lData acquisition systems
lApplications using CPUs
lConsumer electronics
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Analog Microelectronics, Inc.
AME8500 / 8501 |
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Micropower μP Reset Family |
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n Pin Configuration |
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AME8500AEET |
AME8500BEET |
AME8500CEET |
AME8501AEET |
AME8501BEET |
AME8501CEET |
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1: GND |
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1: Reset/ResetB |
1: Reset/ResetB |
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2: GND |
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2: VDD |
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2: Reset/ResetB |
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3: VDD |
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3: VDD |
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3: GND |
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AME8500AEFT |
AME8500BEFT |
AME8500CEFT |
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AME8501AEFT |
AME8501BEFT |
AME8501CEFT |
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1: GND |
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1: Reset/ResetB |
1: VDD |
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2: VDD |
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2: VDD |
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2: GND |
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3: Reset/ResetB |
3: GND |
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3: Reset/ResetB |
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Analog Microelectronics, Inc.
AME8500 / 8501 Micropower μP Reset Family
n Ordering Information
AME8500xEET |
X X XX |
( SOT-23) |
AME8501xEET |
X X XX |
( SOT-23) |
AME8500xEFT |
X X XX |
( SOT-89) |
AME8501xEFT |
X X XX |
( SOT-89) |
VDD Threshold Voltage (VTH)
21: VTH=2.1V
24: VTH=2.4V
26:VTH=2.63V
27:VTH=2.7V
28:VTH=2.8V
29:VTH=2.93V
31: VTH=3.08V
40: VTH=4.0V
42: VTH=4.20V
44: VTH=4.38V
46: VTH=4.63V
note: Please contact AME sales dept. for other voltage options.
Reset Time (TD2NOM)
A:TD=1.5mS
D:TD=30mS
E:TD=150mS
F:TD=210mS
Output Driver Option
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characteristic of |
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RESET or RESETB pin |
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--For example-- |
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Polarity |
* |
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AME8500AEETAF27 means: |
A: |
RESETB |
PP |
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Output is RESETB, push pull |
B: |
RESETB |
OD |
* Output Driver Chart Explanation: |
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Reset time is 210mS |
C: |
RESET |
PP |
PP = Push pull output |
VDD threshold voltage is 2.7V |
D: |
RESET |
OD |
OD = Open drain output |
No temperature shutdow n |
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Polarity |
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RESET = Active high |
Note: AME8500 without over-temperature thermal shutdown function.
AME8501 with over-temperature thermal shutdown function.
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Analog Microelectronics, Inc.
AME8500 / 8501 |
Micropower μP Reset Family |
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n Absolute Maximum Ratings |
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Parameter |
Maximum |
Unit |
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Supply Voltage |
7 |
V |
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ESD Classification |
B |
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Input Current, VDD |
20 |
mA |
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Output Current, RESET, ResetB |
20 |
mA |
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Rate of Rise, VDD |
100 |
V/μs |
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n Recommended Operating Conditions |
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Parameter |
Rating |
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Supply Voltage |
1.6 - 5 V |
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Ambient Temperature Range |
-40 to +85 oC |
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Junction Temperature |
-40 to +125 oC |
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Storage Temperature |
-65 to 150 OC |
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n Thermal Information |
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Parameter |
Maximum |
Unit |
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Thermal Resistance (SOT-23) |
325 |
oC /W |
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Thermal Resistance (SOT-89) |
180 |
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Power Dissipation (SOT-23) |
350 |
mW |
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Power Dissipation (SOT-89) |
650 |
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Maximum Junction Temperature |
150 |
oC |
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Maximum Lead Temperature ( 10 Sec) |
300 |
oC |
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Caution: Stress above the listed absolute rating may cause permanent damage to the device
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