AME, Inc.
AME8570
n
General Description
The AME8570 family allows the user to customize the
CPU reset function without any external components.
The user has serveral choice of reset voltage thresholds,
reset time intervals, and output driver configurations, all
of which are preset at the factory.
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 immedi-
ately ( within an interval T
D1
). The reset remains asserted
after the supply voltage rises above the voltage threshold
for a time interval, T
D2
. 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 only when supply voltage is greater than
1V.
The AME8570 also provide a reset manually by pulling
the MRB input to ground.
Space saving SC-70 package and micropower quies-
cent current ( < 5.0µA ) make this family a natural for
portable battery powered equipment.
GND
µProcessor
Supervisory
n
Functional Block Diagram
AME8570 Push-Pull RESET/ RESETB
IN
R1
I1
Delay
R2
GND
V
REF
N1
P1
RESET/
RESETB
AME8570 Open-Drain RESET/RESETB
IN
R1
I1
Delay
RESET/
RESETB
N1
R2
V
REF
n
Features
l
Small Packages : SC-70, SOT-23
l
Tight Voltage Threshold Tolerance :
± 1.50%
l
Wide Temperature Range : -40
O
C to 85
O
C
l
Low Quiescent Current < 5.0
µA
l
Manual Reset Input Option
l
All AME's Lead Free Products Meet RoHS
Standards
AME8570 Push-Pull RESET/ RESETB with MRB
MRB
IN
R1
I1
Delay
R2
GND
V
REF
N1
P1
RESET/
RESETB
AME8570 Open-Drain RESET/ RESETB with MRB
n
Applications
l
Portable Electronics
l
Power Supplies
l
Computer Peripherals
l
Data Acquisition Systems
l
Applications using CPUs
l
Consumer Electronics
1
MRB
IN
R1
I1
Delay
R2
GND
V
REF
N1
RESET/
RESETB
Rev. A.01
AME, Inc.
AME8570
n
Typical Operating Circuit
µProcessor
Supervisory
V
IN
R*
PULL-UP
V
IN
µP
PUSH BUTTON RESET / RESETB
SWITCH
MRB
GND
RESET
INPUT
GND
Note: * External pull-up resistor is required if open-drain output is used. 10KΩ is recommended.
n
Pin Configuration
SC-70-3
Top View
3
SOT-23
Top View
AME8570AEIT
1. GND
2. RESET/RESETB
3
AME8570AEET
1. GND
2. RESET/RESETB
AME8570
3. IN
AME8570
3. IN
1
2
1
2
* Die Attach:
Non-Conductive Epoxy
SC-70-4
Top View
4
3
* Die Attach:
Non-Conductive Epoxy
AME8570AEIU
1. GND
2. RESET/RESETB
AME8570
3. MRB
4. IN
1
2
* Die Attach:
Non-Conductive Epoxy
2
Rev. A.01
AME, Inc.
AME8570
n
Pin Description
AME8570AEIT / AME8570AEET
µProcessor
Supervisory
Pin Number
1
2
Pin Name
GND
RESET/RESETB
Ground
Pin Description
This pin can be ordered as RESET or RESETB. Reset is active high.
RESETB is active low. It is also available with an open-drain or push-pull
output.
Positive power supply. A reset is asserted after this voltage drops below
a predetermined level. After V
IN
rises above that level the reset output
remains asserted until the end of the reset timeout period.
3
IN
AME8570AEIU
Pin Number
1
2
Pin Name
GND
RESET/RESETB
Ground
Pin Description
This pin can be ordered as RESET or RESETB. Reset is active high.
RESETB is active low. It is also available with an open-drain or push-pull
output.
Manual RESET. Active low. Pulling this pin low forces a reset. After a
low to high transition reset, remains asserted for exactly one reset timeout
period. This pin is internally pulled high. The pin is floating or tied to V
IN
,
if it is unused.
Positive power supply. A reset is asserted after this voltage drops below
a predetermined level. After V
IN
rises above that level the reset output
remains asserted until the end of the reset timeout period.
3
MRB
4
IN
3
Rev. A.01
AME, Inc.
AME8570
n
Ordering Information
AME8570 x x x x x x xx x
Special Feature
V
IN
Threshold Voltage (V
TH
)
Reset Time (T
D2NOM
)
Output Driver Option
Number of Pins
Package Type
Operating Ambient Temperature Range
Pin Configuration
µProcessor
Supervisory
Pin
Configuration
Operating Ambient
Temperature Range
Package
Type
Number
of
Pins
T: 3
U: 4
Output Options
Reset Time
(T
D2NOM
)
V
IN
Threshold
Voltage (V
TH
)
23: V
TH
=2.32V
26: V
TH
=2.63V
29: V
TH
=2.93V
31: V
TH
=3.08V
46: V
TH
=4.63V
Special
Feature
E: -40
O
C to 85
O
C
1. GND
(SOT-23 )
2. RESET/
(SC-70 -3)
RESETB
3. IN
A
A
(SC-70 -4)
E: SOT-2X
I: SC-70
A:
B:
C:
D:
RESETB/PP
RESETB/OD
RESET/PP
RESET/OD
F: 210ms
Z: Lead free
1. GND
2. RESET/
RESETB
3. MRB
4. IN
(RESET=Active High)
(RESETB=Active Low)
(PP=Push-pull out)
(OD=Open-Drain
4
Rev. A.01
AME, Inc.
AME8570
n
Ordering Information
Part Number
AME8570AEETAF23Z
AME8570AEITAF23Z
AME8570AEIUAF23Z
AME8570AEETAF26Z
AME8570AEITAF26Z
AME8570AEIUAF26Z
AME8570AEETAF29Z
AME8570AEITAF29Z
AME8570AEIUAF29Z
AME8570AEETCF29Z
AME8570AEITCF29Z
AME8570AEIUCF29Z
AME8570AEETAF31Z
AME8570AEITAF31Z
AME8570AEIUAF31Z
AME8570AEETBF31Z
AME8570AEITBF31Z
AME8570AEIUBF31Z
AME8570AEETAF46Z
AME8570AEITAF46Z
AME8570AEIUAF46Z
AME8570AEETCF46Z
AME8570AEITCF46Z
AME8570AEIUCF46Z
µProcessor
Supervisory
Marking*
BJOww
BJPw
BJQw
BJRww
BJSw
BJTw
BJUww
BJVw
BJWw
BJXww
BJYw
BJZw
BKAww
BKBw
BKCw
BKDww
BKEw
BKFw
BKGww
BKHw
BKIw
BKJww
BKKw
BKLw
Output Voltage
2.32V
2.32V
2.32V
2.63V
2.63V
2.63V
2.93V
2.93V
2.93V
2.93V
2.93V
2.93V
3.08V
3.08V
3.08V
3.08V
3.08V
3.08V
4.63V
4.63V
4.63V
4.63V
4.63V
4.63V
Package
SOT-23
SC-70-3
SC-70-4
SOT-23
SC-70-3
SC-70-4
SOT-23
SC-70-3
SC-70-4
SOT-23
SC-70-3
SC-70-4
SOT-23
SC-70-3
SC-70-4
SOT-23
SC-70-3
SC-70-4
SOT-23
SC-70-3
SC-70-4
SOT-23
SC-70-3
SC-70-4
Operating Ambient
Temperature Range
-40
o
C to 85
o
C
-40
o
C to 85
o
C
-40
o
C to 85
o
C
-40
o
C to 85
o
C
-40
o
C to 85
o
C
-40
o
C to 85
o
C
-40
o
C to 85
o
C
-40
o
C to 85
o
C
-40
o
C to 85
o
C
-40
o
C to 85
o
C
-40
o
C to 85
o
C
-40
o
C to 85
o
C
-40
o
C to 85
o
C
-40
o
C to 85
o
C
-40
o
C to 85
o
C
-40
o
C to 85
o
C
-40
o
C to 85
o
C
-40
o
C to 85
o
C
-40
o
C to 85
o
C
-40
o
C to 85
o
C
-40
o
C to 85
o
C
-40
o
C to 85
o
C
-40
o
C to 85
o
C
-40
o
C to 85
o
C
Note: ww & w represents the date code and pls refer to the Date Code Rule on Package Dimension.
* A line on top of the first letter represents lead free plating such as BJOww.
Pls consult AME sales office or authorized Rep./Distributor for the availability of output voltage or package type.
5
Rev. A.01
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