A1244 datasheet(3/12 Pages) ALLEGRO

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ELECTRICAL CHARACTERISTICS Valid at TA = –40°C to 150°C, TJ < TJ(max), CBYP = 0.01 μF, through operating supply voltage

range; unless otherwise noted

Characteristics

Symbol

Test Conditions

Min.

Typ.

Max.

Unit

Supply Voltage1,2

VCC

Operating, TJ ≤ 165 °C

3.0

–

Supply Current

ICC(L)

-I1

B < BRP

–

6.9

-I2

B < BRP

2–5

ICC(H)

B > BOP

–

Supply Zener Clamp Voltage

VZ(sup)

ICC(L)(max) + 3 mA, TA = 25°C

–

Supply Zener Clamp Current

IZ(sup)

VZ(sup) = 28 V

–

ICC(L)(max)

+ 3 mA

Reverse Supply Current

IRCC

VRCC = –18 V

–

–1.6

Output Slew Rate3

di/dt

No bypass capacitor, capacitance of probe

CS = 20 pF

–90–

mA/ μs

Chopping Frequency

–

700

–

kHz

Power-Up Time2,4,5

ton

––

μs

Power-Up State4,6,7

POS

ton < ton(max), VCC slew rate > 25 mV/μs–

ICC(H)

––

1VCC represents the generated voltage between the VCC pin and the GND pin.

2The VCC slew rate must exceed 600 mV/ms from 0 to 3 V. A slower slew rate through this range can affect device performance.

3Measured without bypass capacitor between VCC and GND. Use of a bypass capacitor results in slower current change.

4Power-Up Time is measured without and with bypass capacitor of 0.01 μF, B < BRP – 10 G. Adding a larger bypass capacitor would cause longer

Power-Up Time.

5Guaranteed by characterization and design.

6Power-Up State as defined is true only with a VCC slew rate of 25 mV/μs or greater.

7For t > ton and BRP < B < BOP, Power-Up State is not defined.

MAGNETIC CHARACTERISTICS1 Valid at TA = –40°C to 150°C, TJ < TJ (max); unless otherwise noted

Characteristics

Symbol

Test Conditions

Min.

Typ.

Max.

Unit2

Magnetic Operating Point

BOP

–

Magnetic Release Point

BRP

–80

–

–5

Hysteresis

BHYS

BOP – BRP

–

110

1Relative values of B use the algebraic convention, where positive values indicate south magnetic polarity, and negative values indicate north

magnetic polarity; therefore greater B values indicate a stronger south polarity field (or a weaker north polarity field, if present).

2 1 G (gauss) = 0.1 mT (millitesla).

Chopper-Stabilized, Two Wire

Hall-Effect Latch

A1244

Allegro MicroSystems, LLC

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

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