Maxim MAX6304ESA, MAX6304EPA, MAX6304CUA, MAX6304CSA, MAX6304CPA Datasheet

RESET

RESET

19-1078; Rev 0; 6/96

+5V, Low-Power µP Supervisory Circuits

with Adjustable Reset/Watchdog

_______________General Description

The MAX6301/MAX6302/MAX6303/MAX6304* low­power microprocessor (µP) supervisory circuits provide
maximum adjustability for reset and watchdog functions.
The reset threshold can be adjusted to any voltage
above 1.22V, using external resistors. In addition, the
reset and watchdog timeout periods are adjustable
using external capacitors. A watchdog select pin
extends the watchdog timeout period to 500x. The reset
function features immunity to power-supply transients.

These four devices differ only in the structure of their reset
outputs (see

Selector Guide

). The MAX6301–MAX6304
are available in the space-saving 8-pin µMAX package,
as well as 8-pin DIP/SO.

________________________Applications

Medical Equipment Embedded Controllers
Intelligent Instruments Critical µP Monitoring
Portable Equipment Set-Top Boxes
Battery-Powered Computers

Computers/Controllers

_____________________Selector Guide

FEATURE MAX6301 MAX6302 MAX6303 MAX6304

Active-Low
Reset

Active-High
Reset

Open-Drain
Reset Output

Push/Pull
Reset Output

Pins-Package

✓

—

✓ ✓

— —

8-DIP/SO/

µMAX

—

✓

8-DIP/SO/

µMAX

✓

—

— —

✓ ✓

8-DIP/SO/

µMAX

—

✓

8-DIP/SO/

µMAX

__________________Pin Configuration

TOP VIEW



RESET IN

( ) ARE FOR MAX6302/MAX6304.

* Patents pending

1

GND

2

MAX6301

SRT

SWT

MAX6302

3

MAX6303
MAX6304

4

DIP/SO/µMAX

________________________________________________________________

V

8

CC

RESET (RESET)

7

WDI

6

WDS

5

____________________________Features

♦ Adjustable Reset Threshold
♦ Adjustable Reset Timeout
♦ Adjustable Watchdog Timeout
♦ 500x Watchdog Timeout Multiplier
♦ 4µA Supply Current
♦ RESET or
♦ Push/Pull or Open-Drain Output Options
♦ Guaranteed

= 1V (MAX6301/MAX6303)

V

CC

Output Options

Asserted At or Above

♦ Power-Supply Transient Immunity
♦ Watchdog Function Can Be Disabled
♦ DIP/SO/µMAX Packages Available

______________Ordering Information

PART

MAX6301CPA

MAX6301CSA
MAX6301CUA 0°C to +70°C
MAX6301EPA
MAX6301ESA -40°C to +85°C

Ordering Information continued at end of data sheet.

TEMP. RANGE PIN-PACKAGE

0°C to +70°C
0°C to +70°C

-40°C to +85°C 8 Plastic DIP

8 Plastic DIP
8 SO
8 µMAX

8 SO

__________Typical Operating Circuit

V

IN

MAX6301

ONLY

R1

1

RESET IN

R2

2

GND

3

SRT

4

SWT

C

C

SWT

SRT

( ) ARE FOR MAX6302/MAX6304.

MAX6301
MAX6302
MAX6303
MAX6304

8

V

CC

0.1µF

RESET

7

(RESET)

6

WDI

5

WDS

Maxim Integrated Products

R

R

MAX6302

L

ONLY

WDS = 0 FOR NORMAL MODE
WDI = 1 FOR EXTENDED MODE

L

RESET

µP

I/O

MAX6301–MAX6304

1

For free samples & the latest literature: http://www.maxim-ic.com, or phone [phone]

+5V, Low-Power µP Supervisory Circuits
with Adjustable Reset/Watchdog

ABSOLUTE MAXIMUM RATINGS

VCC.......................................................................-0.3V to +7.0V

RESET IN, SWT, SRT..................................-0.3V to (V

WDI, WDS..............................................................-0.3V to +7.0V

RESET, RESET

MAX6301...........................................................-0.3V to +7.0V

MAX6302/6303/6304..............................-0.3V to (V

Input Current

...............................................................................±20mA

V

CC

GND..............................................................................±20mA

Output Current

RESET, RESET..............................................................±20mA

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.

CC

CC

+ 0.3V)

+ 0.3V)

ELECTRICAL CHARACTERISTICS

(VCC= +2V to +5.5V, TA= T

MIN

to T

, unless otherwise noted. Typical values are at VCC= +5V and TA= +25°C.)

MAX

MAX6301–MAX6304

Operating Voltage Range
(Note 1)

Supply Current (Note 2)

RESET TIMER

Reset Input Threshold Voltage
Reset Input Hysteresis

Reset Input Leakage Current

Reset Output Voltage High
(MAX6302/MAX6303/MAX6304)

Reset Output Voltage Low
(MAX6301/MAX6303/MAX6304)

VCCto Reset Delay
Reset Input Pulse Width
Reset Timeout Period (Note 3)

Reset Output Leakage Current

V

V

HYST

RESET IN

V

V

MAX6301C/MAX6303C
MAX6301E/MAX6303E

CC

MAX6302/MAX6304
No load

CC

V

TH

OH

OL

RD

RI

RP

RESET IN

V

RESET IN

VCC≥ 4.5V, I
VCC= 2V, I
MAX6302/MAX6304, VCC= 1.31V, RL= 10kΩ
VCC≥ 4.5V, I
VCC= 2V, I

MAX6301/
MAX6303

VCCfalling at 1mV/µs
Comparator overdrive = 50mV
C

SRT

MAX6301, V
MAX6302, V

falling, VCC= 5.0V
rising, VCC= 5.0V

SOURCE

SOURCE

SINK

SINK

VCC= 1V, I
TA= 0°C to +70°C

VCC= 1.2V, I
TA= -40°C to +85°C

= 1500pF

RESET

RESET

Continuous Power Dissipation (TA= +70°C)

Plastic DIP (derate 9.09mW/°C above +70°C) ............727mW

SO (derate 5.88mW/°C above +70°C).........................471mW

µMAX (derate 4.10mW/°C above +70°C) ....................330mW

Operating Temperature Ranges

MAX630_C_A......................................................0°C to +70°C

MAX630_E_A...................................................-40°C to +85°C

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

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

CONDITIONS

1.00 5.50

1.20 5.50

1.31 5.50

1.195 1.220 1.245

1.240 1.265

= 0.8mA

= 0.4mA

= 3.2mA

= 1.6mA

= V

CC

= GND

SINK

SINK

= 50µA,

= 100µA,

VCC- 0.4

VCC - 0.4

VCC- 0.3

0.4

0.4

0.3

0.3

±1
±1

UNITSMIN TYP MAXSYMBOLPARAMETER

V

µA4.0 7.0I

V

mV20V

nA±0.01 ±1I

V

V

µs63t
µs26t

ms2.8 4.0 5.2t
µA

2 _______________________________________________________________________________________

+5V, Low-Power µP Supervisory Circuits

with Adjustable Reset/Watchdog

ELECTRICAL CHARACTERISTICS (continued)

(VCC= +2V to +5.5V, TA= T

WATCHDOG TIMER

WDI, WDS Input Threshold

WDI Pulse Width
WDI, WDS Leakage Current Extended mode disabled ±1 µA

WDI Sink/Source Current
(Note 4)

Watchdog Timeout Period
(Note 3)

Note 1: Reset is guaranteed valid from the selected reset threshold voltage down to the minimum VCC.
Note 2: VDS = V

, WDI unconnected.

CC

Note 3: Precision timing currents of 500nA are present at both the SRT and SWT pins. Timing capacitors connected to these nodes

must have low leakage consistent with these currents to prevent timing errors.

Note 4: The sink/source is supplied through a resistor, and is proportional to V

MIN

to T

, unless otherwise noted. Typical values are at VCC= +5V and TA= +25°C.)

MAX

CONDITIONS

V

t

V

IH

IL

VCC= 4.5V to 5.5V

WP

VCC= 2V to 4.5V 60

0.7V

Extended mode enabled ±70 µA

t

WD

WDS = GND, C
WDS = VCC, C

= 1500pF 2.8 4.0 5.2

SWT

= 1500pF 1.4 2.0 2.6 sec

SWT

(Figure 8). At VCC= 2V, it is typically ±24µA.

CC

30

CC

0.3V

CC

UNITSMIN TYP MAXSYMBOLPARAMETER

V

ns

ms

__________________________________________Typical Operating Characteristics

(C

SWT

= C

= 1500pF, TA= +25°C, unless otherwise noted.)

SRT

MAX6301–MAX6304

RESET TIMEOUT PERIOD

vs. C

10,000

VCC = 5V

1000

100

10

1

RESET TIMEOUT PERIOD (ms)

0

0.001 0.01 0.1 1 10 100 1000

SRT

C

(nF)

SRT

_______________________________________________________________________________________

WATCHDOG TIMEOUT PERIOD vs. C

10,000

6301-4 TOC-01

VCC = 5V

1000

100

10

1

WATCHDOG TIMEOUT PERIOD (sec)

0

0.001 0.01 0.1 1 10 100 1000

EXTENDED-MODE 

(WDS = V

C

SWT

(nF)

)

CC

SWT



6301-4 TOC-02

WATCHDOG TIMEOUT PERIOD vs. C

10,000

VCC = 5V

1000

100

10

1

WATCHDOG TIMEOUT PERIOD (ms)

0.1

0.001 0.01 0.1 1 10 100 1000

NORMAL-MODE 

(WDS = GND)

C

(nF)

SWT

SWT



6301-4 TOC-03

3

+5V, Low-Power µP Supervisory Circuits
with Adjustable Reset/Watchdog

____________________________Typical Operating Characteristics (continued)

(C

= C

SWT

4.2

4.0

3.8

3.6

3.4

3.2

SUPPLY CURRENT (µA)

3.0

2.8

2.6

MAX6301–MAX6304

= 1500pF, TA= +25°C, unless otherwise noted.)

SRT

SUPPLY CURRENT vs.

SUPPLY VOLTAGE

RESET DEASSERTED
NO LOAD

3.0 5.01.5 2.5 4.53.5 5.5

SUPPLY VOLTAGE (V)

6.02.0 4.0

6301-4 TOC-04

(ms)

WD

/t

RP

t

WATCHDOG TIMEOUT PERIOD

4.20
VCC = 5.0V

4.15

4.10

4.05

4.00

3.95

3.90

3.85

3.80

-40 40

RESET AND NORMAL-MODE

vs. TEMPERATURE

080-60 -20 6020 100

TEMPERATURE (°C)

6301-4 TOC-05

MAXIMUM TRANSIENT DURATION vs.

RESET THRESHOLD OVERDRIVE (V

120
110
100

90

RESET OCCURS 

80

ABOVE THE CURVE

70
60

50
40

30

TRANSIENT DURATION (µs)

20
10

0

0 200 400 600 1000800

RESET THRESHOLD OVERDRIVE (mV)

SEE

NEGATIVE-GOING VCC

TRANSIENTS

SECTION

V

RST

RST

= 4.60V

)

6301-4 TOC-06

5.00

4.75

4.50

4.25

4.00

3.75

3.50

3.25

SUPPLY CURRENT (µA)

3.00

2.75

2.50

76

72

68

64

60

PROPAGATION DELAY (µs)

56

SUPPLY CURRENT 

vs. TEMPERATURE

RESET DEASSERTED

NO LOAD

VCC = 5.0V

VCC = 2.0V

-40 40

080-60 -20 6020 100

TEMPERATURE (°C)

VCC TO RESET DELAY 

vs. TEMPERATURE (V

VCC FALLING AT 1mV/µs

FALLING)

CC

6301-4 TOC-07

6301-4 TOC-09

RESET IN THRESHOLD VOLTAGE 

vs. TEMPERATURE

1.226

1.224

1.222

1.220

1.218

1.216

RESET REFERENCE VOLTAGE (V)

1.214

-40 40

080-60 -20 6020 100

TEMPERATURE (°C)

RESET AND WATCHDOG 

TIMEOUT vs. V

4.16

4.12

4.08

(ms)

WP

/t

RP

4.04

t

4.00

6301-4 TOC-08

CC

6301-4 TOC-10

52

-40 40

080-60 -20 6020 100

TEMPERATURE (°C)

3.96


23 546

SUPPLY VOLTAGE (V)

4 _______________________________________________________________________________________