Microsemi

Analog Mixed Signal Group

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

Page 1

Copyright

© 2003

Rev. 1.1, 2009-02-11

LX6433

Precision Voltage Monitor

TM

®

DESCRI PTION

The LX6433 is a precise voltage

monitor programmed to signal a low

supply line condition.

VMON is

connected to the “monitored” supply

line, when VMON drops below the

threshold of 1.085V, RESET line

goes low.

When power is restored

and

VMON

moves

above

the

threshold voltage, RESET remains

low for an additional 100ms to ensure

system reset is fully applied.

Digital filtering inside the LX6433

ignores temporary dips in the VMON

line lasting for less than 10µS to

avoid false triggering.

The monitor operates over a supply

range (VIN) of 3V to 6V. The RESET

line is capable of sinking an output

load current of 1mA.

This line is

protected from short circuit to VIN or

Ground without damage.

Tight threshold detection allows for a

1.085V

to

1.125V

window

over

temperature.

System efficiency is

maintained with ultra low IQ of 20µA.

The 5 pin SOT-23 package provides

a small form factor similar to industry

standard device types in this category.

This

package

is

RoHS

compliant

allowing Pb free PCB assembly.

IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com

KEY FEATUR ES

Precise Threshold Detection

1.105V ±0.02V

3V to 6.0V Operating Range

Active Low RESET, Sink

Current > 1mA

RESET Pulse Duration

Controlled, typical 100mS

Quiescent Current < 40

μA

Wide Temperature: 0-85°C

No External Components

Required

SOT-23, 5-Pin Package, RoHS

Compliant (Pb-Free)

Similar Devices: FM803,

NCP803 and LM3724

APPLICATIONS/BENEFITS

Portable Microprocessor Core

Voltage Supply Monitor

Supply Monitoring: 1.2V, 2.5V,

3.3V, 5V or any other level.

PRODU C T HIGHL IGHT

VIN

VMON

RESET

GND

LX6433CSE

R Pull-up

(Optional)

3.3 to 5V

VCC

Reset

Ground

1.2V Supply

Microprocessor / ASIC

Figure 1

– LX6433 Typical Application Circuit

PACK AG E OR DER INFORMATION

SE

Plastic SOT-23

5-PIN (Pb Free)

Supply

Voltage (VIN)

Fault Detection

Threshold Voltage

RoHS Compliant / Pb-free

0 to 85

3 to 6V

1.105V +/-1.8%

LX6433CSE

Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX6433CSE-TR)

Device Marking

2975