ZM33164CSTZ - Diodes Incorporated

SUPPLY VOLTAGE

MONITOR

ISSUE 4 – JULY 2006

ZM33164

DEVICE DESCRIPTION

The ZM33164 is a three terminal under

voltage monitor circuit for use in

microprocessor systems. The threshold

voltage of the device has been set to 4.3volts

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

ZM33164 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 SOT223

for surface mount requirements.

FEATURES

•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

•4.3 volt threshold for 5 volt logic

•60mV hysteresis prevents erratic operation

APPLICATIONS

•Microprocessor systems

•Computers

•Computer peripherals

•Instrumentation

•Automotive

•Battery powered equipment

SCHEMATIC DIAGRAM

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TEST CONDITIONS

(Tamb=25°C for typical values, Tamb=-40 to 85°C for min/max values (Note3))

COMPARATOR

PARAMETER SYMBOL MIN TYP. MAX. UNITS

Threshold Voltage

High state output (Vcc increasing) VIH 4.15 4.33 4.45 V

Threshold Voltage

Low state output (Vcc decreasing) VIL 4.15 4.27 4.45 V

Hysteresis VH0.02 0.06 V

OUTPUT

Output sink saturation: VOL

(Vcc=4.0V, Isink=8.0mA) 0.46 1.0 V

(Vcc=4.0V, Isink=2.0mA) 0.15 0.4 V

(Vcc=1.0V, Isink=0.1mA) 0.25 V

Onstate output sink current

(Vcc , Output=4V)

Isink 10 20 50 mA

Offstate output leakage current

(Vcc , Output=5V)

Ioh 0.02 0.5 µA

Clamp diode forward voltage

(If=10mA)

Vf0.6 1.2 1.5 V

Propagation delay

(Vin 5V to 4V, Rl=10k, Tamb=25°C)

Td2.0 µs

TOTAL DEVICE

Operating input voltage range Vcc 1.0 to 10 V

Quiescent input current (Vcc=5V) Iq175 260 µA

Note:

1. Maximum package power dissipation must be observed

2. Maximum power dissipation for the SOT223 package 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

ZM33164

ABSOLUTE MAXIMUM RATING

Input Supply Voltage -1 to 12V

Offstate Output Voltage 12V

Onstate Output

Sink 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 -65 to 150°C

Power Dissipation

TO92 780mW

SOT223 2W(Note 2)

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ZM33164

TYPICAL CHARACTERISTICS

02 4 6 810

100

200

400

300

500

00.8 1.62.00.4 1.2

Sink Current (mA)

-40 °C

25 °C

85 °C

Vin=4V

Output Voltage (V)

01234

-1

Time (µS)

Vin (V)

RL=10K

-40 -20 020

40 60 80

4.34

4.32

4.30

4.28

4.26

4.24

Temperature ( °C)

Forward Voltage (V)

Threshold Voltage (V)

Forward Current (mA) Input Current (µA)

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)

85 °C

25 °C-40 °C

0 0.4 0.8 1.2 1.6 2.0

100

Vin=0V

-40 °C

25 °C

85 °C

RL=10K

TA=25

°C



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Vcc

Threshold

Voltag e

Output

Undefined

Output

Undefined

Output

Note 4: A time delayed reset can be accomplished with the additional Cd.

TDY = RCd ln

1 − VTH (mpu )

Vin

TIMING DIAGRAM

APPLICATION CIRCUIT

TDY =Time (Seconds)

VTH =Microprocessor Reset Threshold

Vin =Power Supply Voltage

ZM33164

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SOT223 Package Suffix – G

Top View –

Pin 4 floating or connected to pin 2

CONNECTION DIAGRAMS

ORDERING INFORMATION

Part Number Package Part Mark

ZM33164G SOT223 ZM33164

ZM33164C TO92 ZM33164

TO92 Package Suffix – C

Bottom View

ZM33164

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Issue 4 - July 2006 www.zetex.com