Zetex ZSH330C, ZSH330G, ZSH330N8 Datasheet

SUPPLY VOLTAGE
MONITOR

ISSUE 1 - DECEMBER 1997

ZSH330

DEVICE DESCRIPTION

The ZSH330 is a three terminal under voltage
monitor circuit for use in microprocessor
systems. The threshold voltage of the device
has been set to 3.1 volts making it ideal for

3.3 volt circuits.

Included in the device is a precise voltage
reference and a comparator with built in
hysteresis to prevent erratic operation. The
ZSH330 features an open collector output
capable of sourcing 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
high 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 high.

The device is available in a TO92 package for
through hole applications as well as SO8 and
SOT223 for surface mount requirements.

SCHEMATIC DIAGRAM

FEATURES

SO8, SOT223 and TO92 packages

•

Power on reset generator

•

Automatic reset generation

•

Low standby current

•

Guaranteed operation from 1 volt

•

Wide supply voltage range

•

Internal clamp diode to discharge

•

delay capacitor

3.1 volt threshold for 3.3 volt logic

•

20mV hysteresis prevents erratic operation

•

APPLICATIONS

Microprocessor systems

•

Computers

•

Computer peripherals

•

Instrumentation

•

Automotive

•

Battery powered equipment

•

Vcc

Out

Gnd

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ZSH330

ABSOLUTE MAXIMUM RATING

Input Supply Voltage -1 to 10V
Offstate Output Voltage 10V
Onstate Output

Source Current(

Note 1) Internally limited

Clamp Diode
Forward Current(

Note 1) 100mA

Operating Junction
Temperature 150°C

Operating Temperature -40 to 85°C
Storage Temperature -55 to 150°C

TEST CONDITIONS
(T

=25°C for typical values, T

amb

=-40 to 85°C for min/max values (Note3))

amb

COMPARATOR

PARAMETER SYMBOL
Threshold Voltage

Low state output (V

increasing) V

cc

IL

Threshold Voltage
High state output (V

Hysteresis V

decreasing) V

cc

IH

H

OUPUT

PARAMETER SYMBOL
Output source saturation: V

(Vcc=2.7V, I
(V

=2.7V, I

cc

(V

=1.0V, I

cc

=8.0mA) VCC-1.3 V

source

=2.0mA) VCC-1.2 V

source

=2µA)

source

Onstate output source current
(V

=2.7V, Output=0V)

cc

Offstate output leakage current
(V

=3.3V, Output=0V)

cc

Clamp diode forward voltage (I

=10mA) V

f

Propagation delay
(V

3.3V to 2.7V, Rl=10k, T

in

amb

=25°C)

OH

I

source

I

oh

f

T

d

TOTAL DEVICE

PARAMETER SYMBOL
Operating input voltage range V
Quiescent input current (V

Note:

1. Maximum package power dissipation must be observed.

2. Maximum power dissipation, for the SOT223 and SO8 packages, is calculated assuming
that the device is mounted on a PCB measuring 2 inches square.

3. Low duty cycle pulse techniques are used during test to maintain junction temperatures as
close to ambient as possible.

=3.3V) I

cc

cc

q

Power Dissipation

TO92 780mW
SOT223 2W(

Note 2)

SO8 780mW(

MIN TYP. MAX.

UNITS

3.01 3.09 3.15 V

3.01 3.07 3.15 V

0.01 0.02 0.05 V

MIN TYP. MAX.

V

CC

UNITS

-0.4 V

10 21 50 mA

0.02 0.5

µA

0.6 1.2 1.5 V

1.4

MIN TYP. MAX.

µs

UNITS

1.0 to 6.5 V
130 180

µA

Note 2)

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