AME, Inc.

1

AME8510 / 8520 / 8530

Micropower

µµµµµP Watch Dog Timer

l Small packages: SOT-25

l 7 voltage threshold options

l Tight voltage threshold tolerance ---±1.50%

l 12 output driver configuration options

l Low quiescent current < 3.0µA

l 3 bonding options

The AME8510/8520/8530 family allows the user to cus-

tomize the CPU monitoring function without any external

components. The user has a large choice of reset volt-

age thresholds and output driver configurations, all of

which are preset at the factory. Each wafer is trimmed

to the customer's specifications.

These circuits will ignore fast negative going transients

on V

correct down to 1V.

After V

the AME8510/8520/8530 assert a reset signal. After a

predetermined time (the “reset” interval) the reset is

deasserted. If V

a reset is asserted immediately. In addition to a supply

monitoring function the AME8510/8520 also monitor tran-

sitions at the watch dog (WDI) input. If a logic transition

does not occur at the WDI pin within a certain time inter-

val (the “watchdog” interval) then a reset is asserted. The

reset deasserts after the reset interval, as explained ear-

lier.

The AME8510/8530 can both assert a reset manually

by pulling the MRB input to ground.

Space saving SOT-25 packages and micropower qui-

escent current make this family a natural for portable

battery powered equipment.

n General Description

n Features

l Motherboards

l Computer peripherals

l Portable electronics

l Applications using CPUs

l Consumer electronics

n Applications

n Pin Configuration

AME8510

1. Reset/ResetB

2. GND

3. MRB

4. WDI

5. V

DD

SOT-25

Top View

13

2

5

4

AME8510

SOT-25

Top View

AME8520

1. Reset/ResetB

2. GND

3. ResetB/Reset

4. WDI

5. V

DD

13

2

5

4

AME8520

SOT-25

Top View

AME8530

1. Reset/ResetB

2. GND

3. ResetB/Reset

4. MRB

5. V

DD

13

2

5

4

AME8530