MAXIM P89C660, P89C662, P89C664, P89C668 Technical data

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General Description

The MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/ MAX6348 microprocessor (µP) supervisory circuits monitor the power supplies in µP and digital systems. These devices provide excellent circuit reliability and low cost by eliminating external components and adjustments when used with 2.5V, 3V, 3.3V, and 5V powered circuits.

These circuits perform a single function: they assert a reset signal whenever the VCCsupply voltage declines below a preset threshold, keeping it asserted for at least 100ms after VCChas risen above the reset threshold. The only difference between the devices is their output. The MAX6326/MAX6346 (push-pull) and MAX6328/ MAX6348 (open-drain) have an active-low reset output. The MAX6327/MAX6347 have an active-high push-pull reset output. All of these parts are guaranteed to be in the correct state for VCCdown to 1V. The reset comparator is designed to ignore fast transients on VCC. Reset thresholds are factory-trimmable between 2.2V and

4.63V, in approximately 100mV increments. Twenty-one standard versions are available. Contact the factory for availability of nonstandard versions.

Ultra-low supply currents (1µA max for the MAX6326/ MAX6327/MAX6328) make these parts ideal for use in portable equipment. All six devices are available in space-saving SOT23 and SC70 packages.

Applications

Computers Intelligent Instruments

Controllers Automotive

Critical µP and µC Portable/Battery-Powered Power Monitoring Equipment

Features

♦ Ultra-Low 1µA (max) Supply Current

(MAX6326/MAX6327/MAX6328)

♦ Precision Monitoring of 2.5V, 3V, 3.3V, and 5V

Power-Supply Voltages

♦ Reset Thresholds Available from 2.2V to 4.63V

♦ Fully Specified Over Temperature

♦ 100ms (min) Power-On Reset Pulse Width

♦ Low Cost ♦ Available in Three Versions: Push-Pull RESET,

Push-Pull RESET, and Open-Drain RESET

♦ Power-Supply Transient Immunity

♦ No External Components

♦ 3-Pin SC70/SOT23 Packages

♦ Pin Compatible with MAX803/MAX809/MAX810

MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348

3-Pin, Ultra-Low-Power SC70/SOT

µP Reset Circuits

________________________________________________________________ Maxim Integrated Products 1

Pin Configuration

19-1294; Rev 3; 1/00

†The MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/ MAX6348 are available in factory-set V

reset thresholds from

2.2V to 4.63V, in approximately 0.1V increments. Choose the desired reset-threshold suffix from Table 1 and insert it in the blank spaces following “R.” There are 21 standard versions with a required order increment of 2500 pieces. Sample stock is generally held on the standard versions only (see the Selector Guide). Required order increment is 10,000 pieces for nonstandard versions (Table 2). Contact factory for availability. All devices available in tape-and-reel only.

Ordering Information

3 SC70-3

3 SC70-3-40°C to +85°C

-40°C to +85°C

MAX6348XR_ _-T

MAX6347XR_ _-T

MAX6346XR_ _-T

3 SC70-3

PIN-PACKAGETEMP. RANGE

-40°C to +85°C

MAX6328XR_ _-T

MAX6327XR_ _-T

MAX6326XR_ _-T

PART

†

3 SOT23-3-40°C to +85°CMAX6326UR_ _-T

3 SOT23-3-40°C to +85°CMAX6327UR_ _-T

3 SOT23-3-40°C to +85°CMAX6328UR_ _-T

3 SOT23-3-40°C to +85°CMAX6346UR_ _-T

3 SOT23-3-40°C to +85°CMAX6347UR_ _-T

3 SOT23-3-40°C to +85°CMAX6348UR_ _-T

Selector Guide appears at end of data sheet.

TOP VIEW

GND

MAX6326 MAX6327

(RESET) RESET

MAX6328 MAX6346 MAX6347 MAX6348

3 V

SOT23-3/SC70-3

( ) ARE FOR THE MAX6327/MAX6347.

MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348

3-Pin, Ultra-Low-Power SC70/SOT µP Reset Circuits

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VCC= full range, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C and VCC= 3V.) (Note 1)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

Terminal Voltage (with respect to GND) V

...........................................................................-0.3V to +6V

RESET, RESET (push-pull) .........................-0.3V to (V

+ 0.3V)

RESET (open drain)..................................................-0.3V to +6V

Input Current (V

).............................................................20mA

Output Current (RESET, RESET).........................................20mA

Rate of Rise (V

) ...........................................................100V/µs

Continuous Power Dissipation (T

= +70°C)

3-Pin SC70 (derate 2.7mW/°C above +70°C)...............174mW

3-Pin SOT23 (derate 4mW/°C above +70°C)................320mW

Operating Temperature Range ...........................-40°C to +85°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

Note 1: Overtemperature limits are guaranteed by design and not production tested.

RESET Output Voltage (MAX6327/MAX6347)

0.4I

SINK

= 3.2mA, VCC= V

TH(MAX)

, VTH≥ 4.5V

0.4

SINK

= 3.2mA, VCC≥ 4.5V, reset not asserted,

VTH≤ 4.38V

SOURCE

= 50µA, VCC≥ 1.2V, reset asserted

0.3

SINK

= 1.2mA, VCC≥ 3.2V, reset not asserted,

MAX6327 only

0.8 · V

SOURCE

= 500µA, VCC≥ 2.1V, reset asserted

1.0 1.75

µA

0.5 1.0

Supply Current I

VCC= 5.5V, no load

Reset Threshold

VTH-

VTH+

1.5% 1.5% VV

VTH-

VTH+

2.5% 2.5%

Table 1

TA= +25°C

TA= -40°C to +85°C

1.2 5.5

1.0 5.5

0.8 · V

Open-Drain RESET Output Leakage Current

µA0.1

RESET Threshold Hysteresis

9.5MAX6346/MAX6347/MAX6348

6.3MAX6326/MAX6327/MAX6328

VCCto Reset Delay 20 µsVCC= VTHto (VTH- 100mV)

PARAMETER SYMBOL MIN TYP MAX UNITS

ms100 185 280

VCCRange V

Reset Threshold Tempco ∆VTH/°C 40 ppm/°C

CONDITIONS

TA= 0°C to +70°C

TA= -40°C to +85°C

Reset Active Timeout Period

SOURCE

= 800µA, VCC= V

TH(MAX)

, VTH≥ 4.5V

RESET Output Voltage (MAX6326/MAX6346)

SOURCE

= 800µA, VCC= 4.5V, VTH≤ 4.38V

SOURCE

= 500µA, VCC= 3.2V, MAX6326 only

MAX632_ only, VCC= 3.0V for VTH≤ 2.93V, VCC= 3.2V for VTH> 2.93V, no load

0.3I

SINK

= 1.6mA, VCC> 2.1V, reset asserted

RESET Output Voltage (MAX6326/MAX6328/ MAX6346/MAX6348)

0.4I

SINK

= 100µA, VCC≥ 1.2V, reset asserted

MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348

3-Pin, Ultra-Low-Power SC70/SOT

µP Reset Circuits

_______________________________________________________________________________________ 3

__________________________________________Typical Operating Characteristics

(TA = +25°C, unless otherwise noted.)

______________________________________________________________Pin Description

FUNCTION

1 1 Ground

2 —

Active-Low Reset Output. RESET remains low while VCCis below the reset threshold and for at least 100ms after V

rises above the reset threshold.

RESET is open-drain on the MAX6328/MAX6348 and push-pull on the MAX6326/MAX6346.

— 2

Active-High Reset Output. RESET remains high while VCCis below the reset threshold and for at least 100ms after V

rises above the reset threshold.

3 3 Supply Voltage

NAME

GND

RESET

MAX6327 MAX6347

MAX6326/MAX6346 MAX6328/MAX6348

SUPPLY CURRENT vs. TEMPERATURE

1.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

SUPPLY CURRENT (µA)

0.2

0.1

-40 0-20 20 40 60 80

VCC = 5V

VCC = 3.3V

VCC = 1.2V

TEMPERATURE (°C)

POWER-UP RESET TIMEOUT

vs. TEMPERATURE

210

200

190

180

170

160

150

POWER-UP RESET TIMEOUT (ms)

140

130

-40 0-20 20 40 60 80 TEMPERATURE (°C)

MAX6326-01

MAX6326-03

200

150

100

RESET DELAY (µs)

500

400

300

200

100

MAXIMUM TRANSIENT DURATION (µs)

POWER-DOWN RESET DELAY

vs. TEMPERATURE

VOD = 20mV

VOD = 100mV

-40 0-20 20 40 60 80

VOD = 10mV

VOD = 200mV

TEMPERATURE (°C)

MAXIMUM TRANSIENT DURATION

vs. RESET THRESHOLD OVERDRIVE (SC70)

1 100 1000

RESET THRESHOLD OVERDRIVE,

- V

(mV)

MAX6326-02

MAX6326-04

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