Maxim MAX6337US24D3-T, MAX6337US25D1-T, MAX6337US25D2-T, MAX6337US24D1-T, MAX6337US23D2-T Datasheet

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General Description

The MAX6335/MAX6336/MAX6337 microprocessor (µP)
supervisory circuits monitor the power supplies in 1.8V
to 3.3V µP and digital systems. They increase circuit reli­ability and reduce cost by eliminating external compo­nents and adjustments. They also feature a debounced
manual-reset input.

These devices perform a single function: they assert a
reset signal whenever the VCCsupply voltage declines
below a preset threshold or whenever manual reset is
asserted. Reset remains asserted for a preset timeout
period after VCChas risen above the reset threshold or
after manual reset is deasserted. The only difference
among the three devices is their output. The MAX6336
(push/pull) and MAX6337 (open-drain) have an active­low RESET output, while the MAX6335 (push/pull) has
an active-high RESET output. The MAX6335/MAX6336
are guaranteed to be in the correct state for VCCdown
to 0.7V. The MAX6337 is guaranteed to be in the cor­rect state for VCCdown to 1.0V.

The reset comparator in these ICs is designed to ignore
fast transients on VCC. Reset thresholds are factory­trimmable between 1.6V and 2.5V, in approximately
100mV increments. There are 15 standard versions
available (2500 piece minimum-order quantity); contact
the factory for availability of nonstandard versions
(10,000 piece minimum-order quantity). For space-criti­cal applications, the MAX6335/MAX6336/MAX6337
come packaged in a 4-pin SOT143.

Applications

Pentium II™ Computers
Computers
Controllers
Intelligent Instruments
Critical µP/µC Power Monitoring
Portable/Battery-Powered Equipment
Automotive

Features

♦ Ultra-Low 0.7V Operating Supply Voltage
♦ Low 3.3µA Supply Current
♦ Precision Monitoring of 1.8V and 2.5V Power-

Supply Voltages

♦ Reset Thresholds Available from 1.6V to 2.5V,

in Approximately 100mV Increments

♦ Debounced Manual Reset
♦ Fully Specified over Temperature
♦ Three Power-On Reset Pulse Widths Available

(1ms min, 20ms min, 100ms min)

♦ Low Cost
♦ Three Available Output Structures: Push/Pull

RESET, Push/Pull RESET, Open-Drain RESET

♦ Guaranteed RESET/RESET Valid to V

CC

= 0.7V

(MAX6335/MAX6336)

♦ Power-Supply Transient Immunity
♦ No External Components
♦ 4-Pin SOT143 Package
♦ Pin-Compatible with MAX811/MAX812 and

MAX6314/MAX6315

MAX6335/MAX6336/MAX6337

4-Pin, Ultra-Low-Voltage, Low-Power

µP Reset Circuits with Manual Reset

________________________________________________________________

Maxim Integrated Products

1

19-1412; Rev 0; 12/98

PART*

MAX6335US__D_-T
MAX6336US__D_-T
MAX6337US__D_-T

-40°C to +85°C

-40°C to +85°C

-40°C to +85°C

TEMP. RANGE PIN-PACKAGE

4 SOT143
4 SOT143
4 SOT143

Ordering Information

*

These devices are available in factory-set VCCreset thresh­olds from 1.6V to 2.5V, in approximately 0.1V increments.
Choose the desired reset threshold suffix from Table 1 and
insert it in the blanks following “US” in the part number.
Factory-programmed reset timeout periods are also available.
Insert the number corresponding to the desired nominal reset
timeout period (1 = 1ms min, 2 = 20ms min, 3 = 100ms min) in
the blank following “D” in the part number. There are 15 stan­dard versions with a required order increment of 2500 pieces.
Sample stock is generally held on the standard versions only
(see Selector Guide). Contact the factory for availability of non­standard versions (required order increment is 10,000 pieces).
All devices available in tape-and-reel only.

Typical Operating Circuit and Pin Configuration appear
at end of data sheet.

Selector Guide appears at end of data sheet.

Pentium II is a trademark of Intel Corp.

MAX6335/MAX6336/MAX6337

4-Pin, Ultra-Low-Voltage, Low-Power
µP Reset Circuits with Manual Reset

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VCC= full range, MR = VCCor unconnected, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C and

V

CC

= 3V, reset not asserted.)

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)

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

Push/Pull RESET or RESET, MR ............-0.3V to (V

CC

+ 0.3V)

Open-Drain RESET ..............................................-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)

SOT143 (derate 4mW/°C above +70°C) .....................320mW

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

Storage Temperature Range.............................-65°C to +160°C

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

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Supply Voltage Range V

CC

TA = 0°C to +85°C

MAX6335/MAX6336 0.7 5.5
MAX6337 1.0 5.5

TA = -40°C to +85°C

MAX6335/MAX6336 0.78 5.5
MAX6337 1.2 5.5

V

Supply Current I

CC

No load

V

CC

= 1.8V

3.0 6.0

V

CC

= 2.5V

3.3 7.0

µA

TA = +25°C

V

TH -

V

TH

V

TH +

1.8% 1.8%

TA = -40°C to +85°C

V

TH -

V

TH

V

TH +

3% 3%

Reset Threshold V

TH

MAX633_US__D_-T,
Table 1

V

VCCFalling Reset Delay VCCfalling at 10V/ms 24

µs
MAX633_US__D1-T 1 1.5 2
MAX633_US__D2-T 20 30 40Reset Active Timeout Period

t

RP

MAX633_US__D3-T 100 150 200

ms

RESET Output Low Voltage
(MAX6336/MAX6337)

V

OL

I

SINK

= 50µA, V

CC

≥ 1.0V 0.4

Reset
asserted

V

RESET Output High Voltage
(MAX6336)

V

OH

I

SOURCE

= 200µA, V

CC

≥ 1.8V 0.8V

CC

I

SOURCE

= 500µA, V

CC

≥ 2.7V 0.8V

CC

V

RESET Output Voltage
(MAX6335)

V

OH

Reset
asserted

I

SOURCE

= 1µA, V

CC

≥ 1.0V 0.8V

CC

I

SOURCE

= 200µA, V

CC

≥ 1.8V 0.8V

CC

V

V

OL

Reset not
asserted

I

SINK

= 500µA, V

CC

≥ 1.8V

I

SINK

= 1.2mA, V

CC

≥ 2.7V

0.3
V

0.3

Reset not
asserted

0.3V

CC

0.7V

CC

MR Minimum Pulse Width

1

V

CC

= 2.6V 160

µs

V

CC

= 2.6V 0.42 µs

V

ns

V

MR

MR Threshold

MR Reset Delay

MR Glitch Immunity

12 20 30 kΩ

MR Pull-Up Resistance

I

SINK

= 500µA, V

CC

≥ 1.8V 0.3

0.5

VCC> VTH, RESET deasserted

µA

RESET Output Leakage
Current (MAX6337)

4-Pin, Ultra-Low-Voltage, Low-Power

µP Reset Circuits with Manual Reset

_______________________________________________________________________________________

3

2.0

2.6

2.2

3.0

3.6

3.8

3.4

3.2

4.0

-60

2.4

-40 -20 0

2.8

20 40 60 80 100

SUPPLY CURRENT vs. TEMPERATURE

MAX6335/36/37 toc-1

TEMPERATURE (°C)

I

CC

(µA)

RESET NOT ASSERTED

VCC = 2.5V

VCC = 1.8V

0.950

0.990

0.970

1.000

1.030

1.040

1.020

1.010

1.050

-60 -40

0.980

-20 0

0.960

20 40 60 80 100

NORMALIZED RESET TIMEOUT PERIOD

vs. TEMPERATURE

MAX6335/36/37-2

TEMPERATURE (°C)

NORMALIZED RESET TIMEOUT PERIOD

V

TH

= 2.2V

0

20
10

30

60

70

50
40

80

0.50 1.00 1.50 2.00 2.50 3.00

OUTPUT VOLTAGE LOW

vs. SUPPLY VOLTAGE

MAX6335/36/37 toc-3

VCC (V)

OUTPUT VOLTAGE LOW (mV)

VTH = 2.5V
I

SINK

= 500µA

RESET ASSERTED

TA = +25°C

TA = +85°C

TA = -40°C

0

40
20

80
60

100

120

140

160

0.5 1.0 1.250.75 1.5 1.75 2.0 2.25 2.5

OUTPUT VOLTAGE HIGH

vs. SUPPLY VOLTAGE

MAX6335/36/37 toc-4

VCC (V)

OUTPUT VOLTAGE HIGH (V

CC

- V

OH

) (mV)

VTH = 2.2V
I

SOURCE = 100µA

RESET ASSERTED

TA = +25°C

TA = +85°C

TA = -40°C

100 1000

0

100

200

400

300

500

600

0.1 1 10

MAXIMUM TRANSIENT DURATION

vs. RESET COMPARATOR OVERDRIVE

MAX6335/36/37 toc-5

RESET COMPARATOR OVERDRIVE (mV)

MAXIMUM TRANSIENT DURATION (µs)

RESET OCCURS

RESET DOES
NOT OCCUR

10

20

-20

40

30

70

60

50

80

-60 0-40 20 40 60 80 100

VCC FALLING PROPAGATION DELAY

vs. TEMPERATURE

MAX6332/33/34 toc-6

TEMPERATURE (°C)

PROPAGATION DELAY (µs)

VCC FALLING AT 10V/ms

VCC FALLING AT 1V/ms

__________________________________________Typical Operating Characteristics

(Reset not asserted, TA= +25°C, unless otherwise noted.)

MAX6335/MAX6336/MAX6337