Maxim MAX6322HPUK50C-T, MAX6322HPUK50D-T, MAX6322HPUK46D-T, MAX6322HPUK47A-T, MAX6322HPUK47B-T Datasheet

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19-0496; Rev 3; 1/99

5-Pin µP Supervisory Circuits with Watchdog and Manual Reset

________________General Description

The MAX6316–MAX6322 family of microprocessor (µP) supervisory circuits monitors power supplies and microprocessor activity in digital systems. It offers several combinations of push/pull, open-drain, and bidirectional (such as Motorola 68HC11) reset outputs, along with watchdog and manual-reset features. The Selector Guide below lists the specific functions available from each device. These devices are specifically designed to ignore fast negative transients on VCC. Resets are guaranteed valid for VCC down to 1V.

These devices are available in 26 factory-trimmed reset threshold voltages (from 2.5V to 5V, in 100mV increments), featuring four minimum power-on reset timeout periods (from 1ms to 1.12sec), and four watchdog timeout periods (from 6.3ms to 25.6sec). Nine standard versions are available with an order increment requirement of 2500 pieces (see Standard Versions table); contact the factory for availability of other versions, which have an order increment requirement of 10,000 pieces.

The MAX6316–MAX6322 are offered in a miniature 5-pin SOT23 package.

________________________Applications

Portable Computers Computers Controllers

Intelligent Instruments Portable/Battery-Powered Equipment Embedded Control Systems

____________________________Features

Small 5-Pin SOT23 Package

Available in 26 Reset Threshold Voltages 2.5V to 5V, in 100mV Increments

Four Reset Timeout Periods

1ms, 20ms, 140ms, or 1.12sec (min)

Four Watchdog Timeout Periods

6.3ms, 102ms, 1.6sec, or 25.6sec (typ)

Four Reset Output Stages Active-High, Push/Pull Active-Low, Push/Pull Active-Low, Open-Drain Active-Low, Bidirectional

Guaranteed Reset Valid to VCC = 1V

Immune to Short Negative VCC Transients

Low Cost

No External Components

_______________Ordering Information

PART

TEMP. RANGE

PIN-PACKAGE

MAX6316LUK____-T

-40°C to +85°C

5 SOT23-5

 

 

 

MAX6316MUK____-T

-40°C to +85°C

5 SOT23-5

MAX6317HUK____-T

-40°C to +85°C

5 SOT23-5

 

 

 

MAX6318HUK____-T

-40°C to +85°C

5 SOT23-5

 

 

 

MAX6318MHUK____-T

-40°C to +85°C

5 SOT23-5

 

 

 

Ordering Information continued at end of data sheet.

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

___________________________________________________________________Selector Guide

 

WATCHDOG

MANUAL

 

RESET OUTPUTS*

 

 

 

 

 

 

PART

RESET

ACTIVE-LOW

ACTIVE-HIGH

ACTIVE-LOW

ACTIVE-LOW

INPUT

 

INPUT

PUSH/PULL

PUSH/PULL

BIDIRECTIONAL

OPEN-DRAIN

 

 

 

 

 

 

 

 

 

MAX6316L

 

 

 

 

 

 

 

 

 

 

MAX6316M

 

 

 

 

 

 

 

 

 

 

MAX6317H

 

 

 

 

 

 

 

 

 

 

MAX6318LH

 

 

 

 

 

 

 

 

 

 

MAX6318MH**

 

 

 

 

 

 

 

 

 

 

MAX6319LH

 

 

 

 

 

 

 

 

 

 

MAX6319MH**

 

 

 

 

 

 

 

 

 

 

MAX6320P

 

 

 

 

 

 

 

 

 

 

MAX6321HP

 

 

 

 

 

 

 

 

 

 

MAX6322HP

 

 

 

 

 

 

 

 

 

 

* The MAX6318/MAX6319/MAX6321/MAX6322 feature two types of reset output on each device. **Future product—contact factory for availability.

________________________________________________________________ Maxim Integrated Products 1

MAX6322–MAX6316

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769.

MAX6316–MAX6322

5-Pin µP Supervisory Circuits with Watchdog and Manual Reset

ABSOLUTE MAXIMUM RATINGS

Voltage (with respect to GND)

 

-0.3V to +6V

VCC......................................................................

 

RESET (MAX6320/MAX6321/MAX6322 only)......

-0.3V to +6V

All Other Pins.........................................

-0.3V to (VCC + 0.3V)

Input/Output Current, All Pins .............................................

 

20mA

Continuous Power Dissipation (TA = +70°C)

 

SOT23-5 (derate 7.1mW/°C above +70°C)

...............571mW

Operating Temperature Range............................

- 40°C to +85°C

Junction Temperature ......................................................

+150°C

Storage Temperature Range..............................

- 65°C to +160°C

Lead Temperature (soldering, 10sec)..............................

+300°C

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.

ELECTRICAL CHARACTERISTICS

(VCC = 2.5V to 5.5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

 

MIN

TYP

MAX

UNITS

 

 

 

 

 

 

 

 

Operating Voltage Range

VCC

TA = -40°C to +85°C

 

1

 

5.5

V

 

 

 

 

 

 

 

 

 

 

MAX6316/MAX6317/MAX6318/

VCC = 5.5V

 

10

20

 

 

 

MAX6320/MAX6321:

 

 

 

 

 

 

 

VCC = 3.6V

 

5

12

 

Supply Current

ICC

MR and WDI unconnected

 

µA

 

 

 

 

 

 

 

MAX6319/MAX6322:

VCC = 5.5V

 

5

12

 

 

 

MR unconnected

 

 

 

 

 

 

 

VCC = 3.6V

 

3

8

 

 

 

 

 

 

 

 

 

Reset Threshold Temperature

VTH/°C

 

 

 

40

 

ppm/°C

Coefficient

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Reset Threshold (Note 2)

VRST

TA = +25°C

 

VTH -1.5%

VTH

VTH +1.5%

V

 

 

 

 

 

TA = -40°C to +85°C

 

VTH -2.5% VTH VTH +2.5%

 

 

 

 

 

 

 

 

 

 

 

 

Reset Threshold Hysteresis

 

 

 

 

3

 

mV

 

 

 

 

 

 

 

 

 

 

MAX63_ _A_-T

 

1

1.4

2

 

 

 

 

 

 

 

 

 

Reset Active Timeout Period

tRP

MAX63_ _B_-T

 

20

28

40

ms

 

 

 

 

 

MAX63_ _C_-T

 

140

200

280

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MAX63_ _D_-T

 

1120

1600

2240

 

 

 

 

 

 

 

 

 

VCC to RESET Delay

tRD

VCC falling at 1mV/µs

 

 

40

 

µs

 

 

 

 

 

 

 

PUSH/PULL RESET OUTPUT (MAX6316L/MAX6317H/MAX6318_H/MAX6319_H/MAX6321HP/MAX6322HP)

 

 

 

 

 

 

 

 

 

 

 

 

VCC ≥ 1.0V, ISINK = 50µA

 

 

 

0.3

 

 

 

 

 

 

 

 

 

 

VOL

VCC ≥ 1.2V, ISINK = 100µA

 

 

 

0.3

 

 

 

 

 

 

 

 

RESET Output Voltage

VCC ≥ 2.7V, ISINK = 1.2mA

 

 

 

0.3

V

 

 

 

 

 

 

 

 

 

 

 

VCC ≥ 4.5V, ISINK = 3.2mA

 

 

 

0.4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VOH

VCC ≥ 2.7V, ISOURCE = 500µA

 

0.8 x VCC

 

 

 

 

 

 

 

 

 

 

 

VCC ≥ 4.5V, ISOURCE = 800µA

 

VCC - 1.5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VOL

VCC ≥ 2.7V, ISINK = 1.2mA

 

 

 

0.3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VCC ≥ 4.5V, ISINK = 3.2mA

 

 

 

0.4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RESET Output Voltage

 

VCC ≥ 1.8V, ISOURCE = 150µA

 

0.8 x VCC

 

 

V

 

 

 

 

 

 

 

 

 

VOH

VCC ≥ 2.7V, ISOURCE = 500µA

 

0.8 x VCC

 

 

 

 

 

 

 

 

 

 

 

 

 

VCC ≥ 4.5V, ISOURCE = 800µA

 

VCC - 1.5

 

 

 

 

 

 

 

 

 

 

 

Note 1: Over-temperature limits are guaranteed by design, not production tested.

Note 2: A factory-trimmed voltage divider programs the nominal reset threshold (VTH). Factory-trimmed reset thresholds are available in 100mV increments from 2.5V to 5V (see Table 1 at end of data sheet).

2 _______________________________________________________________________________________

5-Pin µP Supervisory Circuits with Watchdog and Manual Reset

ELECTRICAL CHARACTERISTICS (continued)

(VCC = 2.5V to 5.5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

 

 

 

 

 

 

 

BIDIRECTIONAL RESET OUTPUT

(MAX6316M/MAX6318MH/MAX6319MH)

 

 

 

 

 

 

 

 

 

 

 

Transition Flip-Flop Setup Time

tS

(Note 3)

 

400

 

ns

 

 

 

 

 

 

 

 

 

VCC = 3.0V, CL = 120pF

 

 

333

 

 

 

 

 

 

 

 

RESET Output Rise Time

tR

VCC = 5.0V, CL = 200pF

 

 

333

ns

(Note 4)

VCC = 3.0V, CL = 250pF

 

 

666

 

 

 

 

 

 

 

 

 

 

 

 

 

VCC = 5.0V, CL = 400pF

 

 

666

 

 

 

 

 

 

 

 

Active Pull-Up Enable Threshold

VPTH

VCC = 5.0V

0.4

0.65

 

V

 

 

 

 

 

 

 

RESET Active Pull-Up Current

 

VCC = 5.0V

 

20

 

mA

 

 

 

 

 

 

 

RESET Pull-Up Resistance

 

 

4.2

4.7

5.2

 

 

 

 

 

 

 

OPEN-DRAIN RESET OUTPUT

(MAX6320P/MAX6321HP/MAX6322HP)

 

 

 

 

 

 

VCC ≥ 1.0V, ISINK = 50µA

 

 

0.3

 

 

 

 

 

 

 

 

RESET Output Voltage

VOL

VCC ≥ 1.2V, ISINK = 100µA

 

 

0.3

V

 

 

 

 

VCC ≥ 2.7V, ISINK = 1.2mA

 

 

0.3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VCC ≥ 4.5V, ISINK = 3.2mA

 

 

0.4

 

 

 

 

 

 

 

 

Open-Drain Reset Output

ILKG

 

 

 

1.0

µA

Leakage Current

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

WATCHDOG INPUT (MAX6316/MAX6317H/MAX6318_H/MAX6320P/MAX6321HP)

 

 

 

 

 

 

 

 

 

 

 

 

 

MAX63_ _ _ W-T

4.3

6.3

9.3

ms

 

 

 

 

 

 

Watchdog Timeout Period

tWD

MAX63_ _ _ X-T

71

102

153

 

 

 

 

 

 

MAX63_ _ _ Y-T

1.12

1.6

2.4

sec

 

 

 

 

 

 

 

 

 

 

MAX63_ _ _ Z-T

17.9

25.6

38.4

 

 

 

 

 

 

 

 

 

 

WDI Pulse Width

tWDI

VIL = 0.3 x VCC, VIH = 0.7 x VCC

50

 

 

ns

 

 

 

 

 

 

 

 

 

WDI Input Threshold

VIL

(Note 5)

0.3 x VCC

 

 

V

 

 

 

 

VIH

 

 

0.7 x VCC

 

 

 

 

 

 

 

 

 

 

 

 

WDI Input Current

IWDI

WDI = VCC, time average

 

120

160

µA

 

(Note 6)

VWDI = 0, time average

-20

-15

 

 

 

 

 

 

 

 

 

 

 

MANUAL-RESET INPUT (MAX6316_/MAX6317H/MAX6319_H/MAX6320P/MAX6322HP)

 

 

 

 

 

 

 

 

 

 

 

 

VIL

VTH > 4.0V

0.8

 

 

 

 

 

 

 

 

 

MR Input Threshold

VIH

 

 

2.0

V

 

 

 

 

 

 

 

 

VIL

VTH < 4.0V

0.3 x VCC

 

 

 

 

 

 

 

 

 

 

 

 

 

VIH

 

 

0.7 x VCC

 

 

 

 

 

 

 

 

 

 

 

 

 

MR Input Pulse Width

 

 

1

 

 

µs

 

 

 

 

 

 

 

 

 

 

 

MR Glitch Rejection

 

 

 

100

 

ns

 

 

 

 

 

 

 

 

 

 

 

MR Pull-Up Resistance

 

 

35

52

75

 

 

 

 

 

 

 

MR to Reset Delay

 

VCC = 5V

 

230

 

ns

 

 

 

 

 

 

 

 

 

 

Note 3: This is the minimum time RESET must be held low by an external pull-down source to set the active pull-up flip-flop. Note 4: Measured from RESET VOL to (0.8 x VCC), RLOAD = ∞ .

Note 5: WDI is internally serviced within the watchdog period if WDI is left unconnected.

Note 6: The WDI input current is specified as the average input current when the WDI input is driven high or low. The WDI input is designed for a three-stated-output device with a 10µA maximum leakage current and capable of driving a maximum capacitive load of 200pF. The three-state device must be able to source and sink at least 200µA when active.

MAX6322–MAX6316

_______________________________________________________________________________________ 3

Maxim MAX6322HPUK50C-T, MAX6322HPUK50D-T, MAX6322HPUK46D-T, MAX6322HPUK47A-T, MAX6322HPUK47B-T Datasheet

MAX6316–MAX6322

5-Pin µP Supervisory Circuits with Watchdog and Manual Reset

__________________________________________Typical Operating Characteristics

(TA = +25°C, unless otherwise noted.)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MAX6316/17/19/20/22

 

 

 

 

MAX6316/17/18/20/21

 

 

 

 

 

 

VCC FALLING TO RESET PROPAGATION

 

 

 

 

 

 

MANUAL-RESET TO RESET

 

 

SUPPLY CURRENT vs. TEMPERATURE

 

 

 

 

 

 

DELAY vs. TEMPERATURE

 

 

 

 

 

 

PROPAGATION DELAY vs. TEMPERATURE

 

10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MAX6316toc01

 

 

100

 

 

 

 

 

 

 

 

 

 

 

 

MAX6316toc03

 

 

320

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MAX6316toc04

CURRENTSUPPLY(μA)

2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PROPAGATIONRESETDELAY (μs)

20

VCC FALLING AT 1mV/μs

 

 

 

 

 

 

 

 

PROPAGATIONDELAY (ns)

180

 

VCC = 5V

 

 

 

 

 

 

 

 

 

 

 

9

 

VCC = 5V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

90

VRST - VCC = 100mV

 

 

 

 

 

 

 

 

 

 

300

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

80

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

280

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

7

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

70

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

260

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

60

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

240

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

50

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VCC = 3V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

220

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

40

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

30

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

200

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

VCC

= 1V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

160

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

140

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

-40

-20

0

 

20

 

40 60 80 100

 

-40 -20

0

20

40

60

80

100

 

 

-40

-20 0

20 40

60

80

100

 

 

 

 

 

 

 

 

 

 

 

 

TEMPERATURE (°C)

 

 

 

 

 

 

 

 

 

 

 

 

 

TEMPERATURE (°C)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TEMPERATURE (°C)

 

 

 

 

 

 

 

 

 

NORMALIZED RESET TIMEOUT

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MAX6316/17/18/20/21

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NORMALIZED WATCHDOG TIMEOUT

 

 

 

 

 

 

 

 

 

 

 

PERIOD vs. TEMPERATURE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PERIOD vs. TEMPERATURE

 

 

 

 

 

 

 

 

 

RESETNORMALIZEDTIMEOUT PERIOD

 

1.05

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MAX6316toc05

 

 

 

 

 

WATCHDOGNORMALIZEDTIMEOUT PERIOD

1.05

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MAX6316toc06

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0.96

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0.96

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1.04

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1.04

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1.03

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1.03

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1.02

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1.02

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1.01

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1.01

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1.00

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1.00

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0.99

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0.99

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0.98

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0.98

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0.97

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0.97

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0.95

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0.95

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

-40

-20

0

20

40

60

80

100

 

 

 

 

 

 

 

 

 

-40

-20

0

20

40

60

80

100

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TEMPERATURE (°C)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TEMPERATURE (°C)

 

 

 

 

 

 

 

 

TRANSIENT DURATION (μs)

MAXIMUM VCC TRANSIENT DURATION

MAX6316M/6318MH/6319MH

 

BIDIRECTIONAL

 

vs. RESET THRESHOLD OVERDRIVE

 

PULL-UP CHARACTERISTICS

80

RESET OCCURS ABOVE LINES

MAX6316toc08

 

+5V

 

 

 

 

 

 

 

 

 

 

 

70

 

74HC05

4.7k

 

 

 

 

 

 

VRST = 3.3V

 

 

 

 

60

 

 

100pF

 

 

 

 

INPUT

 

 

 

 

 

 

 

 

50

VRST = 4.63V

 

 

 

 

 

40

VRST = 2.63V

 

 

 

74HC05

+5V

 

 

 

INPUT

VCC

30

 

 

 

 

 

 

 

 

100pF

RESET

 

 

 

 

 

 

20

 

 

 

 

 

MR GND

 

 

 

 

 

 

10

 

 

 

 

 

 

0

 

 

 

 

 

 

10

100

1000

 

 

200ns/div

 

RESET THRESHOLD OVERDRIVE (mV) VRST - VCC

 

 

 

 

PASSIVE 4.7kΩ PULL-UP 2V/div

RESET, ACTIVE PULL-UP 2V/div

RESET INPUT 5V/div

4 _______________________________________________________________________________________

5-Pin µP Supervisory Circuits with Watchdog and Manual Reset

______________________________________________________________Pin Description

 

 

PIN

 

 

 

 

 

 

 

 

 

 

MAX6316L

 

 

MAX6318LH

MAX6319LH

NAME

FUNCTION

MAX6316M

MAX6317H

 

MAX6318MH

MAX6319MH

 

 

MAX6320P

 

 

MAX6321HP

MAX6322HP

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MAX6316L/MAX6318LH/MAX6319LH:

 

 

 

 

 

 

Active-Low, Reset Output. CMOS push/pull

 

 

 

 

 

 

output (sources and sinks current).

 

 

 

 

 

 

 

 

 

 

 

 

 

MAX6316M/MAX6318MH/MAX6319MH:

 

 

 

 

 

 

Bidirectional, Active-Low, Reset Output.

1

 

1

1

RESET

Intended to interface directly to microprocessors

 

with bidirectional resets such as the Motorola

 

 

 

 

 

 

 

 

 

 

 

 

68HC11.

 

 

 

 

 

 

 

 

 

 

 

 

 

MAX6320P/MAX6321HP/MAX6322HP:

 

 

 

 

 

 

Open-Drain, Active-Low, Reset Output. NMOS out-

 

 

 

 

 

 

put (sinks current only). Connect a pull-up resistor

 

 

 

 

 

 

from RESET to any supply voltage up to 6V.

 

 

 

 

 

 

 

1

 

3

3

RESET

Active-High, Reset Output. CMOS push/pull output

 

 

(sources and sinks current). Inverse of RESET.

 

 

 

 

 

 

 

 

 

 

 

 

 

2

2

 

2

2

GND

Ground

 

 

 

 

 

 

 

 

 

 

 

 

 

Active-Low, Manual Reset Input. Pull low to force a

 

 

 

 

 

 

reset. Reset remains asserted for the duration of

3

3

 

4

MR

the Reset Timeout Period after MR transitions from

 

 

 

 

 

 

low to high. Leave unconnected or connected to

 

 

 

 

 

 

VCC if not used.

 

 

 

 

 

 

 

 

 

 

 

 

 

Watchdog Input. Triggers a reset if it remains

 

 

 

 

 

 

either high or low for the duration of the watchdog

 

 

 

 

 

 

timeout period. The internal watchdog timer clears

4

4

 

4

WDI

whenever a reset asserts or whenever WDI sees a

 

 

 

 

 

 

rising or falling edge. To disable the watchdog fea-

 

 

 

 

 

 

ture, leave WDI unconnected or three-state the dri-

 

 

 

 

 

 

ver connected to WDI.

 

 

 

 

 

 

 

 

 

 

 

 

 

Supply Voltage. Reset is asserted when VCC

 

 

 

 

 

 

drops below the Reset Threshold Voltage (VRST).

5

5

 

5

5

VCC

Reset remains asserted until VCC rises above

 

 

 

 

 

 

VRST and for the duration of the Reset Timeout

 

 

 

 

 

 

Period (tRP) once VCC rises above VRST.

 

 

 

 

 

 

 

MAX6322–MAX6316

_______________________________________________________________________________________ 5

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