AS1916 - AS1918

Microprocessor Supervisory Circuits with Manual

Reset and Watchdog

Dat a Sh eet

www.austriamicrosystems.com

Revision 1.00

1 - 13

1 General Description

The AS1916 - AS1918 microprocessor supervisory cir-

cuits were designed to generate a reset when the moni-

tored supply voltage falls below a factory-trimmed

threshold. The reset remains asserted for a minimum

timeout period after the supply voltage stabilizes.

+1.0V, these devices are ideal for portable and battery-

powered systems with strict monitoring requirements.

The devices feature factory-trimmed thresholds to moni-

tor a supply voltage between 1.8 and 3.6V.

The devices are available with the reset output types

listed in Table 1.

The AS1916 - AS1918 include a manual-reset input for

systems that never fully power down the microproces-

sor.

Additionally, these devices feature a watchdog timer to

help ensure that the processor is operating within proper

code boundaries.

The AS1916 - AS1918 are available in a 5-pin SOT23

package.

Figure 1. Typical Application Diagram

2 Key Features

!

!

!

Reset Timeout Delay: 215ms

!

Manual Reset Input

!

Three Reset Output Types

- Active-Low Push/Pull (AS1916)

- Active-High Push/Pull (AS1917)

- Active-Low Open-Drain (AS1918)

!

Watchdog Timeout Period: 1.5s

!

!

External Components Not Required

!

Operating Temperature Range: -40 to +125°C

!

5-pin SOT23 Package

3 Applications

The devices are ideal for portable and battery-powered

systems, embedded controllers, intelligent instruments,

automotive systems, and critical CPU monitoring appli-

cations.

Table 1. Standard Products

Model

Reset Output Type

AS1916

Active-Low Push/Pull

AS1917

Active-High Push/Pull

AS1918

Active-Low Open-Drain

AS1916/

AS1918

External

Reset

CPU

I/O Supply

GND

RESETN

I/O

4

WDI

5

3

MRN

GND

2

1

RESETN