MAX6326 datasheet(2/12 Pages) PHILIPS

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Philips Semiconductors

Product data

MAX632x/MAX634x

3-pin ultra-low power SC70/SOT

microprocessor reset circuit

2003 Aug 05

DESCRIPTION

The MAX6326/MAX6327//MAX6328/MAX6346/MAX6347/MAX6348

microprocessor (

µP) reset circuits monitor power supplies in µP and

digital systems. These devices eliminate external components and

adjustments while providing excellent circuit reliability and low cost

solution. They are used to monitor 2.5 V, 3 V, 3.3 V and 5 V power

supplies.

They assert a reset signal when the VDD supply voltage falls below a

preset reset threshold voltage. The reset signal remains asserted for

at least 100 ms after the VDD rises above the reset threshold. The

reset threshold are factory trimmable from 2.2 V to 4.63 V in

approximately 100 mV increments. All these parts are guaranteed to

assert a reset for VDD down to 1 V. They have excellent immunity to

fast transients on VDD.

The devices vary in their output configuration. The

MAX6326/MAX6346 have push-pull, active-LOW reset output; while

the MAX6328/MAX6348 have open drain, active-LOW reset output.

The MAX6327/MAX6347 have push-pull, active HIGH reset output.

The lower threshold MAX6326/MAX6327/MAX6328 have ultra-low

supply current of typically 0.5

µA making them ideal for battery

powered applications. All six devices are available in both the 3-pin

SOT23 and SC70 packages.

FEATURES

• Ultra-low 1 µA (max) supply current

• Precision monitoring of 2.5 V, 3 V, 3.3 V, and 5 V power supply

voltages

• Reset thresholds available from 2.2 V to 4.63 V

• Fully specified over temperature –40 °C to +85 °C

• 100 ms (min) power-on-reset delay time

• Power transient immunity

• Available in three versions: Push-Pull RESET, Push-Pull RESET,

and Open-Drain RESET

• Pin compatible with MAX803/MAX809/MAX810

• Small, low cost, 3-pin SC70/SOT23 packages

APPLICATIONS

• Computers and controllers

• Power monitoring

• Portable/battery powered equipment

• Industrial equipment

SIMPLIFIED SYSTEM DIAGRAM

VDD

GND

RESET

SL01835

MAX6328/

MAX6348

MOTOROLA

68HCXX

RPU

Figure 1. MAX6328/6348 simplified system diagram.

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