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

CC

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

3 SC70-3-40°C to +85°C

-40°C to +85°C

-40°C to +85°C

MAX6348XR_ _-T

MAX6347XR_ _-T

MAX6346XR_ _-T

3 SC70-3

3 SC70-3

3 SC70-3

PIN-PACKAGETEMP. RANGE

-40°C to +85°C

-40°C to +85°C

-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

1

MAX6326
MAX6327

(RESET) RESET

MAX6328
MAX6346
MAX6347
MAX6348

2

3 V

CC

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

CC

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

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

CC

+ 0.3V)

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

Input Current (V

CC

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

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

Rate of Rise (V

CC

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

Continuous Power Dissipation (T

A

= +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)

V

OL

0.4I

SINK

= 3.2mA, VCC= V

TH(MAX)

, VTH≥ 4.5V

0.4

I

SINK

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

VTH≤ 4.38V

V

V

OH

I

SOURCE

= 50µA, VCC≥ 1.2V, reset asserted

0.3

I

SINK

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

MAX6327 only

0.8 · V

CC

0.8 · V

CC

I

SOURCE

= 500µA, VCC≥ 2.1V, reset asserted

1.0 1.75

µA

0.5 1.0

Supply Current I

CC

VCC= 5.5V, no load

Reset Threshold

VTH-

V

TH

VTH+

1.5% 1.5%
VV

TH

VTH-

V

TH

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

CC

0.8 · V

CC

0.8 · V

CC

Open-Drain RESET Output
Leakage Current

µA0.1

RESET Threshold
Hysteresis

mV

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

V

Reset Active Timeout Period

I

SOURCE

= 800µA, VCC= V

TH(MAX)

, VTH≥ 4.5V

RESET Output Voltage
(MAX6326/MAX6346)

I

SOURCE

= 800µA, VCC= 4.5V, VTH≤ 4.38V

V

OH

I

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

V

0.3I

SINK

= 1.6mA, VCC> 2.1V, reset asserted

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

V

OL

0.4I

SINK

= 100µA, VCC≥ 1.2V, reset asserted

PIN

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

CC

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

CC

rises above the reset threshold.

3 3 Supply Voltage

NAME

GND

RESET

RESET

V

CC

MAX6327
MAX6347

MAX6326/MAX6346
MAX6328/MAX6348

PIN

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

0

-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)

50

500

400

300

200

100

MAXIMUM TRANSIENT DURATION (µs)

POWER-DOWN RESET DELAY

vs. TEMPERATURE

VOD = 20mV

VOD = 100mV

0

-40 0-20 20 40 60 80

VOD = 10mV

VOD = 200mV

TEMPERATURE (°C)

MAXIMUM TRANSIENT DURATION

vs. RESET THRESHOLD OVERDRIVE (SC70)

0

1 100 1000

10

RESET THRESHOLD OVERDRIVE,

V

- V

(mV)

TH

CC

MAX6326-02

MAX6326-04

MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348

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

4 _______________________________________________________________________________________

____________ Applications Information

Interfacing to µPs with

Bidirectional Reset Pins

Since the RESET output on the MAX6328/MAX6348 is
open drain, these devices interface easily with micro­processors (µPs) that have bidirectional reset pins,
such as the Motorola 68HC11. Connecting the µP
supervisor’s RESET output directly to the microcon­troller’s (µC’s) RESET pin with a single pull-up resistor
allows either device to assert reset (Figure 1).

Negative-Going VCCTransients

In addition to issuing a reset to the µP during power-up,
power-down, and brownout conditions, these devices
are relatively immune to short-duration, negative-going
VCCtransients (glitches).

The Typical Operating Characteristics show the Maxi-
mum Transient Duration vs. Reset Threshold Overdrive
graph, for which reset pulses are not generated. The
graph shows the maximum pulse width that a negative­going VCCtransient may typically have when issuing a
reset signal. As the amplitude of the transient increas­es, the maximum allowable pulse width decreases.

Figure 1. Interfacing to µPs with Bidirectional Reset Pins

Table 1. Factory-Trimmed Reset Thresholds

‡

‡

Factory-trimmed reset thresholds are available in approximately 100mV increments with a 1.5% room-temperature variance.

3.800 3.8953.857 3.705

3.700

3.74338

3.7923.755 3.6073.64437

3.600 3.6903.654 3.510

3.500

3.54636

3.5873.552 3.4123.44735

3.400 3.4853.451 3.315

3.300

3.34934

3.3833.350 3.2173.25033

3.080 3.1503.126 3.003

3.000

3.03431

3.0753.045 2.9252.95530

2.930 3.0002.974 2.857

2.800

2.88629

2.8702.842 2.7302.75828

2.700 2.7682.741 2.633

2.630

2.66027

2.6962.669 2.5642.59126

2.500 2.5622.537 2.437

2.400

2.46225

2.4602.436 2.3402.36424

2.320 2.3752.355 2.2622.28523

MIN

TYP

MAXMAX MIN

TA= -40°C to +85°CTA= +25°C

2.250

RESET THRESHOLD VOLTAGE, VTH(V)

2.1452.2332.2002.167

SUFFIX

MAX634_ _R

MAX634_ _R

MAX634_ _R

MAX634_ _R

MAX634_ _R

MAX634_ _R

MAX632_ _R

MAX632_ _R

MAX632_ _R

MAX632_ _R

MAX632_ _R

MAX632_ _R

MAX632_ _R

MAX632_ _R

MAX632_ _R

PART

22MAX632_ _R

V

CC

V

CC

V

CC

MAX6328
MAX6348

RESET

RESET
INPUT

µP

MOTOROLA

68HCXX

GND

GND

MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348

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

µP Reset Circuits

_______________________________________________________________________________________ 5

Table 1. Factory-Trimmed Reset Thresholds‡(continued)

‡

Factory-trimmed reset thresholds are available in approximately 100mV increments with a 1.5% room-temperature variance.

Table 2. Device Marking Codes and Minimum Order Increments

2.5EHAAMAX6326_R22-T

10

2.5

EXAAMAX6326_R24-T

EWAAMAX6326_R23-T

10EYAAMAX6326_R25-T

2.5

10

2.5

FAAAMAX6326_R27-T

EZAAMAX6326_R26-T

10

FCAAMAX6326_R29-T

FBAAMAX6326_R28-T

10

2.5

10

FDAA

MAX6326_R31-T

FEAAMAX6326_R30-T

10

10

FZAWMAX6346_R34-T

FZAVMAX6346_R33-T

10

10

FZAYMAX6346_R36-T

FZAXMAX6346_R35-T

10

FZBAMAX6346_R38-T

FZAZMAX6346_R37-T

10

10

10

FZBCMAX6346_R40-T

FZBBMAX6346_R39-T

10

FZBEMAX6346_R42-T

FZBDMAX6346_R41-T

2.5

10

FZBGMAX6346_R44-T

FZBFMAX6346_R43-T

10FZBHMAX6346_R45-T

ORDER

INCREMENT

(k)

PART

2.5FZBI

MAX6346_R46-T

2.5

2.5

FFAAMAX6327_R23-T

EIAAMAX6327_R22-T

10

10

FHAAMAX6327_R25-T

FGAAMAX6327_R24-T

2.5FIAAMAX6327_R26-T

10

10

10

FKAAMAX6327_R28-T

FJAAMAX6327_R27-T

2.5

FNAAMAX6327_R30-T

FLAAMAX6327_R29-T

10

10

ORDER

INCREMENT

(k)

2.5

FZBJMAX6347_R33-T

PART

FMAA

MAX6327_R31-T

10

10

FZBLMAX6347_R35-T

FZBKMAX6347_R34-T

10

10

FZBNMAX6347_R37-T

FZBMMAX6347_R36-T

10

FZBPMAX6347_R39-T

FZBOMAX6347_R38-T

10

10

10

FZBRMAX6347_R41-T

FZBQMAX6347_R40-T

10

FZBTMAX6347_R43-T

FZBSMAX6347_R42-T

10

2.5

FZBVMAX6347_R45-T

FZBUMAX6347_R44-T

2.5FZBW

MAX6347_R46-T

AAH

–

ACH

–

–

ACI

ACP

–

ACE

–

–

–

–

–

–

–

–

–

–

–

ACK

–

–

TOP MARK

ACO

SOT23 SC70

ACQ

AAI

–

–

ACR

–

–

–

ACS

TOP MARK

–

ACT

–

–

–

–

–

–

–

–

–

–

–

ACL

ACF

SOT23 SC70

SUFFIX

39

3.841

3.8023.958

RESET THRESHOLD VOLTAGE, VTH(V)

3.997

MINMAX MAX

TYPMIN

40 3.940

3.900

3.9004.060 4.1004.000

41 4.038 3.9974.161 4.202

42 4.137

4.100

4.0954.263 4.3054.200

43 4.235 4.1924.364 4.407

44 4.314

4.300

4.2704.446

TA= +25°C

TA= -40°C to +85°C

4.4894.380

45 4.432 4.3874.567 4.612

46 4.560

4.500

4.5144.699 4.7464.630

PART

MAX634_ _R

MAX634_ _R

MAX634_ _R

MAX634_ _R

MAX634_ _R

MAX634_ _R

MAX634_ _R

MAX634_ _R

MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348

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

6 _______________________________________________________________________________________

___________________Chip Information

TRANSISTOR COUNT: 419

Table 2. Device Marking Codes and Minimum Order Increments (continued)

NOMINAL V

TH

(V)

MAX634_ _R46-T 4.63

MAX634_ _R44-T 4.38

PART

MAX632_ _R31-T 3.08

MAX632_ _R29-T 2.93

MAX632_ _R26-T 2.63

MAX632_ _R23-T 2.32

MAX632_ _R22-T 2.20

Selector Guide

(standard versions*)

*Sample stock is generally held on all standard versions.

SOT23

ORDER

INCREMENT

(k)

PART

10

10

10

FZCAMAX6348_R36-T

FZBZMAX6348_R35-T

10

FZCCMAX6348_R38-T

FZCBMAX6348_R37-T

10

10

10

FZCEMAX6348_R40-T

FZCDMAX6348_R39-T

2.5

10

FZCGMAX6348_R42-T

FZCFMAX6348_R41-T

2.5

10

FZCIMAX6348_R44-T

FZCHMAX6348_R43-T

10

FZCK

MAX6348_R46-T

FZCJMAX6348_R45-T

SC70

–

–

–

–

–

–

–

–

ACM

–

ACN

–

TOP MARK

2.5EJAAMAX6328_R22-T

10

2.5

FPAAMAX6328_R24-T

FOAAMAX6328_R23-T

10FQAAMAX6328_R25-T

2.5

10

2.5

FSAAMAX6328_R27-T

FRAAMAX6328_R26-T

10

FUAAMAX6328_R29-T

FTAAMAX6328_R28-T

10

2.5

TOP MARK

ORDER

INCREMENT

(k)

10

FVAA

MAX6328_R31-T

PART

FWAAMAX6328_R30-T

10

FZBYMAX6348_R34-T

FZBXMAX6348_R33-T

AAJ

–

ACU

–

–

ACJ

ACV

–

ACW

–

–

–

SOT23 SC70

MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348

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

µP Reset Circuits

_______________________________________________________________________________________ 7

________________________________________________________Package Information

SOTPO3L.EPS

MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348

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

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600

© 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

Package Information (continued)

SC70, 3L.EPS

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