Zetex ZM331643G, ZM331643N8, ZM331643C Datasheet

SUPPLY VOLTAGE
MONITOR

ISSUE 2 – NOVEMBER 1995

ZM33164-3

DEVICE DESCRIPTION

The ZM33164-3 is a three terminal under
voltage monitor circuit for use in
microprocessor systems. The threshold
voltage of the device has been set to 2.68
volts making it ideal for 3 volt circuits.

Included in the device is a precise voltage
reference and a comparator with built in
hysteresis to prevent erratic operation. The
ZM33164-3 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.

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

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

•

2.68 volt threshold for 3 volt logic

•

60mV hysteresis prevents erratic operation

APPLICATIONS

•

Microprocessor systems

•

Computers

•

Computer peripherals

•

Instrumentation

•

Automotive

•

Battery powered equipment

SCHEMATIC DIAGRAM

4-99

0246810

-40 °C 25 °C 85 °C

100

200

400

300

500

01

0 0.8 1.6 2.00.4 1.2

0

20

40

50

Sink Current (mA)

-40 °C

25 °C

85 °C

00.4 2.00.8 1 .2 1.6

0

40

60

80

20

-40 °C

85 °C

25 °C

V

in

=

0V

23

45

1

2

3

4

5

0

Output Voltage (V)

0

1

2

3

4

2

4

0

Vin

(V)

2.4

3.0

-40

-20

020406080

2.69

2.67

Temperature ( °C)Forward Voltage (V)

Threshold Voltage (V)

Forward Current (mA)

Input Current (

µ

A)

Input Voltage (V)

Upper Threshold

Lower Threshold

Input Current vs. Input Voltage Output Voltage vs. Input Voltage

Output Saturation Voltage vs. Sink Current Reset Delay Time

Clamp Diode Forward Current vs. Voltage Threshold Voltage vs. Temperature

Input Voltage (V)

Output Saturation Voltage (V)

Vout

(V)

Time (µs)

0

30

10

100

100

2.71

2.73

2.75

2.77

2.65

RL=10K
T

A

=25 °C

R

L

=10K

'

'

Vin=2.4V

ZM33164-3

TYPICAL CHARACTERISTICS

4-101