HN705-706 参数 Datasheet PDF下载

HN705/HN706

HN705/HN706

Low-cost, µP Supervisory Circuits

DESCRIPTION

The HN705/706 microprocessor (µP) supervisory circuits reduce the complexity and number of components required to

monitor power-supply and battery functions in µP systems. These devices significantly improve system reliability and

accuracy compared to separate ICs or discrete components.

The HN705/706 provide four functions:

1) A reset output during power-up, power-down, and brownout conditions.

2) An independent watchdog output that goes low if the watchdog input has not been toggled within 1.6 seconds.

3) A 1.25V threshold detector for power-fail warning, low-battery detection, or for monitoring a power supply other than

+5V.

4) An active-low manual-reset input.

Two supply-voltage monitor levels are available: The HN705 generate a reset pulse when the supply voltage drops

below 4.65V, while the HN706 generate a reset pulse below 4.40V.

Devices are available in 8-pin DIP, SO and compact 8-pin MicroSO packages.

FEATURES

Halts and restarts an out-of-control microprocessor

Holds microprocessor in check during power

transients

Automatically restarts microprocessor after power

failure

Precision power supply monitor

--4.65V threshold (HN705)

--4.40V threshold (HN706)

Debounced manual reset input

Voltage monitor

--1.25V threshold

--Battery monitor / Auxiliary supply monitor

Watchdog timer

200ms reset pulse width

Eliminates the need for discrete components

Industrial temperature range -40

o

C to +85

o

C

The HN705/706 is a plug-in replacement of the

MAX705/706,

DS1705/1706,

IMP705/706,

ADM705/706, MIC705/706 and SP705/706

APPLICATIONS

Microprocessor Systems

PDA and portable Equipment

Computers

Controllers

Wireless communication systems

Intelligent Instruments

Automotive Systems

Critical µP Power Monitoring

ORDERING INFORMATION

PART NO.

HN705EN

HN705EM

HN705EU

HN705EX

HN706EN

HN706EM

HN706EU

HN706EX

TEMP. RANGE (°C)

-40 – 85 °C

-40 – 85 °C

-40 – 85 °C

-40 – 85 °C

-40 – 85 °C

-40 – 85 °C

-40 – 85 °C

-40 – 85 °C

PACKAGE

8-Pin DIP

8-Pin SO

8-Pin MicroSO

Dice

8-Pin DIP

8-Pin SO

8-Pin MicroSO

Dice

1