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Part: AME8500CEETBA31
Category:
Description: Reset Time: 1.5mS; Micropower up Reset Device
Company: Analog Micro
Datasheet: Download AME8500CEETBA31 datasheet File size : 108 kB
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Datasheet text preview:
AME, Inc.
AME8500 / 8501
µProcessor Supervisory
" 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 80oC a reset is asserted and remains asserted until the temperature falls below 60oC. Space saving SOT23 packages and micropower quiescent current (<3.0µA) make this family a natural for portable battery powered equipment.
" Typical Operating Circuit
2
V++
*
V++
AME8500
RESET / RESET GND
Processor
RESET Input GND
3
Note: * External pull-up resistor is required if opendrain output is used. 10 k is recommended.
" Block Diagram
AME8500 with Push-Pull RESET
VDD R1 I1
Delay
" Features
! Small packages: SOT-23, SOT-89 ! 11 voltage threshold options ! Tight voltage threshold tolerance ---±1.50% ! 5 reset interval options ! 4 output configuration options ! Wide temperature range -------- -40oC to 85oC ! Low temperature coefficient --- 100ppm/oC(max) ! Low quiescent current < 3.0µA ! Thermal shutdown option (AME8501)
VDD GND
P1 RESET N1
R2
VREF
AME8500 with Push-Pull RESET
" Applications
! ! ! ! ! ! Portable electronics Power supplies Computer peripherals Data acquisition systems Applications using CPUs Consumer electronics
R1
I1
Delay
P1 RESET N1
R2 GND
VREF
1
AME, Inc.
AME8500 / 8501
µProcessor Supervisory
" Block Diagram (contd.)
AME8500 with Open-Drain RESET
VD D R1 I1
Delay
AME8500 with Open-Drain RESET
VD D R1 R ES ET I1
Delay
R ES ET N1
R2 GND
V R EF
N1 GND
R2
VRE F
" Pin Configuration
SOT-23 Top View
3
SOT-23 Top View AME8500AEET AME8501AEET 1. GND 2. Reset/ResetB 3. V D D
3
AME8500
AME8500
AME8500BEET AME8501BEET 1. Reset/ResetB 2. GND 3. V D D
1
2
1
2
SOT-23 Top View
3
SOT-23-L Top View AME8500CEET AME8501CEET 1. Reset/ResetB 2. V D D 3. GND
3
AME8500
AME8500
AME8500AEET AME8501AEET 1. GND 2. Reset/ResetB 3. V D D
1
2
1
2
2
AME, Inc.
AME8500 / 8501
µProcessor Supervisory
" Pin Configuration (contd.)
SOT-23-L Top View
3
SOT-23-L Top View AME8500BEET AME8501BEET 1. Reset/ResetB 2. GND 3. V D D
3
AME8500
AME8500
AME8500CEET AME8501CEET 1. Reset/ResetB 2. V D D 3. GND
1
2
1
2
SOT-89 Top View AME8500AEFT AME8501AEFT 1. GND 2. V D D 3. Reset/ResetB
SOT-89 Top View AME8500BEFT AME8501BEFT 1. Reset/ResetB 2. V D D 3. GND
AME8500
AME8500
1
2
3
1
2
3
SOT-89 Top View AME8500CEFT AME8501CEFT 1. V D D 2. GND 3. Reset/ResetB
5
SOT-25 Top View
4
AME8500
AME8500
1 2 3
1
2
3
AME8500BEEV AME8501BEEV 1. Reset/ResetB 2. VD D 3. GND 4. N/C 5. N/C
" Pin Description
Pin Name
GND RE SETB/RE SET Ground This pin can be ordered as RESET or RESETB. RESET is active high. RE SETB is active low. It is also available with an open drain or pushpull output. Pos itive power supply. A reset is asserted after this voltage drops below a predetermined level. After VD D rises above that level the reset output remains asserted until the end of the reset timeout period.
3
Pin Description
VD D
AME, Inc.
AME8500 / 8501
µProcessor Supervisory
" Ordering Information AME8500xEEV AME8500xEET AME8500xEET AME8501xEET AME8501xEET AME8500xEFT AME8501xEFT x x x x x x x x x x x x x x xx xx xx L xx xx L xx xx (SOT-25) (SOT-23) (SOT-23-L) (SOT-23) (SOT-23-L) (SOT-89) (SOT-89)
VDD Threshold Voltage(VTH) 15: VTH=1.50V 16: VTH=1.60V 18: VTH=1.80V 19: VTH=1.90V 20: VTH=2.00V 21: VTH=2.10V 22: VTH=2.20V 23: VTH=2.32V 24: VTH=2.40V Reset Time(TD2NOM) A: TD=1.5mS D: TD=30mS E: TD=150mS F: TD=210mS K: TD=440mS Output Driver Option
c har ac ter is tic of RESET or RESETB pin Polarity A: B: C: D: RESETB RESETB RESET RESET * PP OD PP OD
26: 27: 28: 29: 31: 40: 42: 44: 46:
VTH=2.63V VTH=2.70V VTH=2.80V VTH=2.93V VTH=3.08V VTH=4.00V VTH=4.20V VTH=4.38V VTH=4.63V
--For example-AME8500AEETAF27 means: Output is RESETB, push pull Reset time is 210mS VDD thresholdvoltageis 2.7V No temperature shutdown
* Output Driver Chart Explanation: PP = Push pull output OD = Open drain output Polarity RESET = Active high RESETB = Active low
Note: AME8500 without over-temperature thermal shutdown function. AME8501 with over-temperature thermal shutdown function. Please consult AME sales office or authorized Rep./Distributor for other voltage options.
4
AME, Inc.
AME8500 / 8501
µProcessor Supervisory
" Absolute Maximum Ratings
Parameter
Supply Voltage ESD Classification Input Current, VD D Output Current, RESET, ResetB Rate of Rise, VD D
Maximum
7 B 20 20 100
Unit
V
mA mA V/µs
Caution: Stress above the listed absolute maximum rating may cause permanent damage to the device
" Recommended Operating Conditions
Parameter
Supply Voltage Ambient Temperature Range Junc tion Temperature Storage Temperature
Rating
1.6 - 5 - 40 to + 85 - 40 to + 125 - 65 to 150
Unit
V
o o o
C C C
" Thermal Information
Parameter
Thermal Resistance SOT-23 SOT-89 SOT-23 SOT-89
Maximum
325 180 350 650 150 300
Unit
o
C/W
Power Dissipation Max imum Junction Temperature Max imum Lead Temperature (10 Sec)
mW
o o
C C
5
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