ZSM561G Zetex Semiconductors, ZSM561G Datasheet

ZSM561G

Manufacturer Part Number

ZSM561G

Description

SUPPLY VOLTAGE MONITOR

Manufacturer

Zetex Semiconductors

Datasheet

1.ZSM561G.pdf (6 pages)

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SUPPLY VOLTAGE

MONITOR

ISSUE 3 – JANUARY 1998

DEVICE DESCRIPTION

The ZSM561 is a three terminal under

vo l ta ge mo ni t or ci rc ui t f or use i n

microprocessor systems. The threshold

voltage of the device has been set to 4.6 volts

making it ideal for 5 volt circuits.

Included in the device is a precise voltage

reference and a comparator with built in

hysteresis to prevent erratic operation. The

ZSM561 features an open collector output

capable of sinking at least l0mA which only

requires a single external resistor to

interface to following circuits.

Operation of the device is guaranteed from

one volt upwards, from this level to the

device threshold voltage the output is held

low providing a power on reset function.

Should the supply voltage, once established,

at any time drop below the threshold level

then the output again will pull low. Also

included is a 6 volt zener diode connected

between Vcc and Gnd. With just the addition

of a low cost external NPN transistor and

resistor, this zener allows the ZSM561 to

provide both regulator and supply monitor

functions

The device is available in a TO92 package for

through hole applications as well as SO8 and

SOT223 for surface mount requirements.

SCHEMATIC DIAGRAM

4-364

FEATURES

APPLICATIONS

SO8, SOT223 and TO92 packages

Power on reset generator

Automatic reset generation

Low standby current

Guaranteed operation from 1 volt

Wide supply voltage range

delay capacitor

4.6 volt threshold for 5 volt logic

20mV hysteresis prevents erratic operation

Microprocessor systems

Computers

Computer peripherals

Instrumentation

Automotive

Battery powered equipment

Internal clamp diode to discharge

ZSM561

Related parts for ZSM561G

ZSM561G Summary of contents

Page 1

SUPPLY VOLTAGE MONITOR ISSUE 3 – JANUARY 1998 DEVICE DESCRIPTION The ZSM561 is a three terminal under use i n microprocessor systems. The threshold voltage of ...

ABSOLUTE MAXIMUM RATING Input Supply Voltage Supply Zener Current Offstate Output Voltage Onstate Output Sink Current( ) Note 1 Clamp Diode Forward Current( ) Note 1 TEST CONDITIONS (T =25°C for typical values, T amb COMPARATOR PARAMETER Threshold Voltage High ...

Page 3

ZSM561 TYPICAL CHARACTERISTICS 500 400 300 200 100 -40 °C 25 °C 85 ° Input Voltage (V) Input Current vs. Input Voltage 30 V =4V in -40 °C 25 ° ° ...

Page 4

TYPICAL CHARACTERISTICS Input Voltage (V) Input Current vs. Input Voltage TIMING DIAGRAM Vcc Threshold Voltage 1 V Output AAAA AAA AAAA AAA AAAA AAA AAAA AAA AAAA AAA AAAA AAA ...

Page 5

ZSM561 APPLICATION CIRCUITS 1 RCd mpu INMIN The minimum input voltage provided INMIN by the unregulated supply The ...

Page 6

... CONNECTION DIAGRAMS SO8 Package Suffix – N8 Top View TO92 Package Suffix – C Bottom View ORDERING INFORMATION Part Number Package ZSM561N8 SO8 ZSM561G SOT223 ZSM561C TO92 SOT223 Package Suffix – G Top View – Pin 4 floating or connected to pin 2 Part Mark ZSM561 ZSM561 ZSM561 ...

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ZSM561G Zetex Semiconductors, ZSM561G Datasheet

ZSM561G

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ZSM561G Summary of contents

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