AAT3527ICX-2.93-200-T1中文资料

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AAT3526/7/8

MicroPower Supervisory Circuit

3526.2006.03.1.6

1

元器件交易网

AAT3526/7/8

MicroPower Supervisory Circuit

with Manual Reset

Pin Descriptions

AAT3526, 3527, 3528 (SOT143)

Pin #

1

Symbol

GNDRESET(AAT3527)

Function

Ground connection.

RESEToutput remains high while VCCis below the reset threshold and remains so for a minimum of 150ms after VCCraises above thereset threshold.

RESEToutput remains low while VCCis below the reset threshold and remains so for a minimum of 150ms after VCCraises above the reset threshold.

Manual reset active low input. ASupply voltage (+1.2V to +5.5V). Due to extremely low operatingcurrent, it is recommended to place a 10nF capacitor between VCCand GND.

2

RESET(AAT3526,AAT3528)

MR

3

4VCC

Part Number Descriptions

Part Number

AAT3526AAT3527AAT3528

Output Type

Reset Output Push Pull Active Low with DelayReset Output Push Pull Active High with DelayReset Output Open Drain Active Low with Delay

Pin Configuration

SOT143(Top View)

2

3526.2006.03.1.6

元器件交易网

AAT3526/7/8

MicroPower Supervisory Circuit

with Manual Reset

1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at condi-tions other than the operating conditions specified is not implied. Only one Absolute Maximum Rating should be applied at any one time.2. Mounted on an FR4 board.3526.2006.03.1.6

3

元器件交易网

AAT3526/7/8

MicroPower Supervisory Circuit

with Manual Reset

1. See Ordering Information for factory-trimmed reset thresholds.

4

3526.2006.03.1.6

元器件交易网

AAT3526/7/8

MicroPower Supervisory Circuit

with Manual Reset

3526.2006.03.1.6

5

元器件交易网

AAT3526/7/8

MicroPower Supervisory Circuit

with Manual Reset

Functional Description

General

During start-up, the reset pin on a microprocessorensures that it is fully reset and starts up in a knowncondition. The AAT3526/7/8 series of microproces-sor reset devices monitor the supply voltage to a

microprocessor and assert a reset signal wheneverthe VCCvoltage falls below a factory-programmedthreshold. This threshold is accurate within ±1.5%at 25ºC and within ±2.5% over the entire operatingtemperature range. The reset signal remainsasserted for a minimum of 150ms after VCChasrisen above the threshold, as shown in Figure 1.

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3526.2006.03.1.6

元器件交易网

AAT3526/7/8

MicroPower Supervisory Circuit

with Manual Reset

Applications Information

Reset Output Options

The AAT3528 has an active low open drain outputand the AAT3526/7 have a push-pull output. TheAAT3528 may be used in multiple voltage systemswith an external pull-up resistor. This allows theAAT3528 to interface to microprocessors with high-er supply voltages up to 5.5V (Figure 2). In the eventof a power-down or brown-out condition, the resetsignal remains valid until the VCCdrops below 1.2V.To ensure validity down to ground, an external100k resistor should be connected between theRESEToutput and GND.

use of a mechanical switch. It should be a normally-GND. Additionally, the MR pin can be driven fromTTL, CMOS, or open drain logic outputs.

Supply Voltage Transient Behavior

In some cases, fast negative transients of shortduration can appear on the VCCpower supply. TheAAT3526/7/8 series devices provide some immunityto line transients which can generate invalid resetpulses. Figure 1 shows typical behavior to shortduration pulses versus RESETcomparator over-drive. As shown in the Maximum Transient Durationvs. Reset Threshold Overdrive graph, when the tran-sient voltage becomes larger, the time allowedbefore asserting a reset becomes shorter (e.g., typ-ically a transient of 100mV below the reset thresholdwould have to present for more than 50µs to causea reset). Immunity can be increased by the additionof a small bypass capacitor of 0.1µF connected asclose to the VCCpin as possible.

Manual Reset Input

Ais lowThis input is internally pulled up to VCCvia a 65k resistor, so leaving the pin unconnected is accept-able if the manual reset function is not needed. The

3526.2006.03.1.6

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元器件交易网

AAT3526/7/8

MicroPower Supervisory Circuit

with Manual Reset

1. Contact local Sales Office for custom trimmed options.

2. Sample stock is generally held on all part numbers listed in BOLD.3. XYY = assembly and date code.

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3526.2006.03.1.6

元器件交易网

AAT3526/7/8

MicroPower Supervisory Circuit

with Manual Reset

Package Information

SOT143

All dimensions in millimeters.

© Advanced Analogic Technologies, Inc.

AnalogicTech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AnalogicTech product. No circuit patent licenses, copyrights, mask work rights,or other intellectual property rights are implied. AnalogicTech reserves the right to make changes to their products or specifications or to discontinue any product or service without notice.Customers are advised to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are soldsubject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. AnalogicTechwarrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with AnalogicTech’s standard warranty. Testing and other quality con-trol techniques are utilized to the extent AnalogicTech deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed.

Advanced Analogic Technologies, Inc.

830 E. Arques Avenue, Sunnyvale, CA94085Phone (408) 737-4600Fax (408) 737-4611

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