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AS1916

Microprocessor Supervisory Circuits with Manual Reset and Watchdog

austriamicrosystems AG 

Datasheet

AS1916 - AS1918

Microprocessor Supervisory Circuits with Manual Reset and Watchdog

1 General Description

2 Key Features

The AS1916 - AS1918 microprocessor supervisory circuits were

designed to generate a reset when the monitored supply voltage falls

below a factory-trimmed threshold. The reset remains asserted for a

lid minimum timeout period after the supply voltage stabilizes.

Guaranteed to be in the correct state for VCC higher than +1.0V,

these devices are ideal for portable and battery-powered systems

with strict monitoring requirements.

a The devices feature factory-trimmed thresholds to monitor a supply

v voltage between 1.8 and 3.6V.

The devices are available with the reset output types listed in Table

ill 1.

Table 1. Standard Products

t Model

Reset Output Type

G s AS1916

Active-Low Push/Pull

AS1917

Active-High Push/Pull

A t AS1918

Active-Low Open-Drain

s 3 Applicatin The AS1916 - AS1918 include a manual-reset input for systems that

ons never fully power down the microprocessor.

e Additionally, these devices feature a watchdog timer to help ensure

m t that the processor is operating within proper code boundaries.

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

VCC Supervisory Range: +1.8 to +3.6V

Guaranteed Reset Valid Down to VCC = +1.0V

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

Immune to Fast Negative VCC Transients

External Components Not Required

Operating Temperature Range: -40 to +125°C

5-pin SOT23 Package

The devices are ideal for portable and battery-powered systems,

embedded controllers, intelligent instruments, automotive systems,

and critical CPU monitoring applications.

a on Figure 1. Typical Application Diagram

ical c VCC

chn External

Te Reset

5

VCC

1

RESETN

AS1916/

AS1918

3

MRN

4

WDI

GND 2

RESETN

I/O Supply

CPU

GND

I/O

www.austriamicrosystems.com/Supervisors/AS1916

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