Microsemi

Analog Mixed Signal Group

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

Page 4

Copyright

© 2003

Rev. 1.1, 2009-02-11

LX6433

Precision Voltage Monitor

TM

®

FUNCTIO N AL DESCRIPTIO N

The LX6433 operates as a power supply monitor with a

threshold window of 1.085V to 1.125V (±1.8%) that

can be programmable using external resistors.

The

VMON pin is the input to the internal comparator and

VIN is the power source for the IC. The RESET pin is

an open drain, with active low logic. An external pull-

up resistor can be used if the device (ASIC) driven

does not provide this feature.

As VMON ramps upwards from zero, RESET is held

low until VMON exceeds the threshold, this starts an

internal 100ms timer which continues to hold RESET

low for that interval. As long as VMON remains above

the threshold level and the 100ms timer has completed

the cycle, RESET remains high (high impedance state).

If a transient of less than 10uS interrupts VMON

causing a drop below the threshold the LX6433 will

ignore the event.

If VMON does drop below the

threshold for greater than 12µS the RESET will remain

low until VMON recovers above the threshold and the

RESET time pulse has been timed out (100ms).

PACK AG E DI MEN S IONS

SE

5 Pin Plastic SOT-23

H

G

F

E

A1

J

I

C

K

A

B

D

Note:

1. Controlled dimensions are in mm, inches are for

reference only.

2. Dimensions do not include mold flash or protrusions;

these shall not exceed 0.155mm (.006”) on any side.

Lead dimension shall not include solder coverage

Dim

MIN

MAX

MIN

MAX

A

0.90

1.30

0.035

0.051

A1

0.90

1.45

0.035

0.057

B

0.25

0.50

0.010

0.020

C

0.09

0.20

0.004

0.008

D

2.80

3.10

0.110

0.122

E

1.50

1.75

0.059

0.069

F

0.95 BSC

0.038 BSC

G

1.90 BSC

0.075 BSC

H

2.60

3.00

0.102

0.118

I

0.35

0.55

0.014

0.022

J

0.00

0.15

0.000

0.006

K

10° MAX

10° MAX