AME
AME8500
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 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
for supply voltages greater than 1V.
Space saving SOT23/TSOT-23 packages and
micropower quiescent current (<3.0µA) make this family
a natural for portable battery powered equipment.
µProcessor
Supervisory
n
Typical Operating Circuit
2
V
IN
*
V
IN
AME8500
RESET /
RESETB
GND
Processor
RESET
Input
GND
3
Note: * External pull-up resistor is required if open-
drain output is used. 10 kΩ is recommended.
n
Block Diagram
AME8500 with Push-Pull RESETB
n
Features
l
Small Packages: SOT-23/TSOT-23, SOT-89
l
Tight Voltage Threshold Tolerance ---±1.50%
l
Wide Temperature Range ------ -40
o
C to +85
o
C
l
Low Quiescent Current < 3.0µA
l
All AME's Lead Free Products Meet RoHS
standards
GND
Delay
V
IN
I1
R1
P1
RESETB
N1
R2
V
REF
n
Applications
l
Portable Electronics
l
Power Supplies
l
Computer Peripherals
l
Data Acquisition Systems
l
Applications using CPUs
l
Consumer Electronics
R2
GND
V
IN
AME8500 with Push-Pull RESET
R1
I1
P1
RESET
N1
Delay
V
REF
Rev.T.10
1
AME
AME8500
n
Pin Configuration (contd.)
SOT-89
Top View
AME8500AEFT
SOT-89
Top View
AME8500BEFT
µProcessor
Supervisory
AME8500
1. GND
2. IN(TAB)
3. Reset/ResetB
AME8500
1. Reset/ResetB
2. IN(TAB)
3. GND
1
2
3
* Die Attach:
Non-Conductive Epoxy
1
2
3
* Die Attach:
Non-Conductive Epoxy
SOT-89
Top View
AME8500CEFT
1. IN
2. GND(TAB)
3. Reset/ResetB
1
2
3
AME8500
* Die Attach:
Conductive Epoxy
n
Pin Description
Pin Name
GND
RESETB/RESET
Ground
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 pushpull 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.
Pin Description
IN
Rev.T.10
3
嵌入式系统
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