US4881

CMOS Low Voltage High Sensitivity Latch

Preliminary Datasheet

US4881 CMOS Low Voltage High Sensitivity Latch

3901004881 Rev 1.5

24/July/01

Page 1

Prelimina

ry

Features and Benefits

• Chopper stabilized amplifier stage

• Optimized for BDC motor applications

• New miniature package / thin, high reliability package

• Operation down to 2.2V

• CMOS for optimum stability, quality, and cost

• Low I

Applications

• Solid state switch

• Brushless DC motor commutation

• Speed sensing

Ordering Information

Part No.

Temperature Suffix

Package

Temperature Range

US4881

E

SO or UA

-40 to 85

US4881

L

SO or UA

-40 to 150

Contact factory or sales representative for legacy temperature code options

Functional Diagram

Note: Static sensitive device; please observe ESD precautions. Re-

tion, a 100

Ω resistor in series with V

Output

GND

V

DD

Voltage

Regulator

Chopper

SO Package

Pin 2 - Output

Pin 3 - GND

UA Package

Pin 2 - GND

Pin 3 - Output

Description

The US4881 is a bipolar Hall effect sensor IC fab-

ricated from mixed signal CMOS technology. It

incorporates advanced chopper stabilization tech-

niques to provide accurate and stable magnetic

switch points. There are many applications for

this HED in addition to those listed above. The

design specifications and performance have been

optimized for commutation applications in brush-

less DC motors and automotive speed sensing.

the presence of a sufficiently strong South pole

magnetic field facing the marked side of the pack-

in the presence of a North field.

The SOT-23 device is reversed from the UA

package. The SOT-23 output transistor will be

strong North pole magnetic field subjected to the

marked face.