Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPMICsPMIC - system monitor Reset/power-on reset SOT 23 5

19-0496; Rev 11; 2/13

MAX6316–MAX6322

5-Pin µP Supervisory Circuits with

Watchdog and Manual Reset

For pricing, delivery, and ordering information, please contact Maxim Direct

at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.

___________________________________________________________________Selector Guide

________________General Description

The MAX6316–MAX6322 family of microprocessor (µP)

supervisory circuits monitors power supplies and

microprocessor activity in digital systems. It offers sev-

eral combinations of push/pull, open-drain, and bidirec-

tional (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 V

. Resets are

guaranteed valid for V

down to 1V.

These devices are available in 26 factory-trimmed reset

threshold voltages (from 2.5V to 5V, in 100mV incre-

ments), featuring four minimum power-on reset timeout

periods (from 1ms to 1.12s), and four watchdog timeout

periods (from 6.3ms to 25.6s). Thirteen standard ver-

sions 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

o Small 5-Pin SOT23 Package

o Available in 26 Reset Threshold Voltages

2.5V to 5V, in 100mV Increments

o Four Reset Timeout Periods

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

o Four Watchdog Timeout Periods

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

o Four Reset Output Stages

Active-High, Push/Pull

Active-Low, Push/Pull

Active-Low, Open-Drain

Active-Low, Bidirectional

o Guaranteed Reset Valid to V

= 1V

o Immune to Short Negative V

Transients

o Low Cost

o No External Components

_______________Ordering Information

Ordering Information continued at end of data sheet.

ACTIVE-LOW

OPEN-DRAIN

MAX6316L

MAX6316M

MAX6317H



MAX6321HP



MAX6318LH



—

MAX6318MH



—

MAX6319LH —



MAX6319MH —



MAX6320P

 

ACTIVE-LOW

PUSH/PULL



—



—



—

ACTIVE-HIGH

PUSH/PULL

—



—

ACTIVE-LOW

BIDIRECTIONAL

—



—



—



—

PART

WATCHDOG

INPUT

MANUAL

RESET

INPUT

— —



—



MAX6322HP —



—



RESET OUTPUTS*

—



—



The MAX6318/MAX6319/MAX6321/MAX6322 feature two types of reset output on each device.

Typical Operating Circuit and Pin Configurations appear at

end of data sheet.

Devices are available in both leaded and lead(Pb)-free packaging.

Specify lead-free by replacing “-T” with “+T” when ordering.

/V Denotes an automotive-qualified part.

PART TEMP RANGE PIN-PACKAGE

MAX6316LUK_ _ _ _ - T -40°C to +125°C 5 SOT23

MAX6316LUK_ _ _ _ / V + T -40°C to +125°C 5 SOT23

MAX6316MUK_ _ _ _ - T -40°C to +125°C 5 SOT23

MAX6317HUK_ _ _ _ - T -40°C to +125°C 5 SOT23

MAX6318HUK_ _ _ _ - T -40°C to +125°C 5 SOT23

MAX6318MHUK_ _ _ _ - T -40°C to +125°C 5 SOT23

Summary of content (14 pages)

PAGE 1
MAX6316–MAX6322 5-Pin µP Supervisory Circuits with Watchdog and Manual Reset ________________General Description ____________________________Features 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.
PAGE 2
MAX6316–MAX6322 5-Pin µP Supervisory Circuits with Watchdog and Manual Reset ABSOLUTE MAXIMUM RATINGS Voltage (with respect to GND) VCC......................................................................-0.3V to +6V 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 (derate 7.1mW/°C above +70°C)...
PAGE 3
MAX6316–MAX6322 5-Pin µP Supervisory Circuits with Watchdog and Manual Reset ELECTRICAL CHARACTERISTICS (continued) (VCC = 2.5V to 5.5V, TA = -40°C to +125°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) Transitional Flip-Flop Setup Time RESET Output Rise Time (Note 5) tS tR (Note 4) 400 333 333 VCC = 3.0V, CL = 250pF 666 VCC = 5.
PAGE 4
MAX6316–MAX6322 5-Pin µP Supervisory Circuits with Watchdog and Manual Reset 7 6 5 VCC = 3V 4 3 2 VCC = 1V 1 80 70 60 50 40 30 -40 -20 0 20 40 60 80 240 220 200 10 160 140 -20 0 20 40 60 80 -40 100 -20 20 0 40 60 80 100 TEMPERATURE (°C) TEMPERATURE (°C) MAX6316/MAX6317/MAX6318/MAX6320/MAX6321 NORMALIZED WATCHDOG TIMEOUT PERIOD vs. TEMPERATURE MAX6316toc04 1.05 1.04 1.03 1.02 1.01 1.00 0.99 0.98 0.97 0.96 0.
PAGE 5
MAX6316–MAX6322 5-Pin µP Supervisory Circuits with Watchdog and Manual Reset ______________________________________________________________Pin Description PIN MAX6316L MAX6316M MAX6320P MAX6317H MAX6318LH MAX6318MH MAX6321HP MAX6319LH MAX6319MH MAX6322HP NAME FUNCTION MAX6316L/MAX6318LH/MAX6319LH: Active-Low, Reset Output. CMOS push/pull output (sources and sinks current). 1 — 1 1 RESET MAX6316M/MAX6318MH/MAX6319MH: Bidirectional, Active-Low, Reset Output.
PAGE 6
MAX6316–MAX6322 5-Pin µP Supervisory Circuits with Watchdog and Manual Reset VCC MAX6316–MAX6322 RESET (ALL EXCEPT MAX6317) RESET GENERATOR RESET (ALL EXCEPT MAX6316/MAX6320P) VCC 1.23V 52kΩ MR (ALL EXCEPT MAX6318/MAX6321) WATCHDOG TRANSITION DETECTOR WDI (ALL EXCEPT MAX6319/MAX6322) WATCHDOG TIMER 52kΩ GND Figure 1. Functional Diagram _______________Detailed Description A microprocessor’s (µP) reset input starts or restarts the µP in a known state.
PAGE 7
MAX6316–MAX6322 5-Pin µP Supervisory Circuits with Watchdog and Manual Reset Bidirectional RESET Output The MAX6316M/MAX6318MH/MAX6319MH are designed to interface with µPs that have bidirectional reset pins, such as the Motorola 68HC11. Like an open-drain output, these devices allow the µP or other devices to pull the bidirectional reset (RESET) low and assert a reset condition. However, unlike a standard open-drain output, it includes the commonly specified 4.
PAGE 8
MAX6316–MAX6322 5-Pin µP Supervisory Circuits with Watchdog and Manual Reset VCC MAX6316M MAX6318MH MAX6319MH LASERTRIMMED RESISTORS VCC VREF 52kΩ MR RESET GENERATOR WATCHDOG ON 2µs ONE SHOT CIRCUITRY WDI (MAX6316M/ MAX6319MH) (MAX6316M/ MAX6318MH) VCC 2µs ONE SHOT TRANSITION FLIP-FLOP R Q 4.7kΩ FF S RESET ACTIVE PULLUP ENABLE COMPARATOR 0.85VCC 0.65V GND Figure 4.
PAGE 9
MAX6316–MAX6322 5-Pin µP Supervisory Circuits with Watchdog and Manual Reset P-channel transistor on-resistance quickly charges stray capacitance on the reset line, allowing RESET to transition from low to high within the required two electronic-clock cycles, even with several devices on the reset line. This process occurs regardless of whether the reset was caused by VCC dipping below the reset threshold, the watchdog timing out, MR being asserted, or the µP or other device asserting RESET.
PAGE 10
MAX6316–MAX6322 5-Pin µP Supervisory Circuits with Watchdog and Manual Reset VCC tRST RESET tRP tWD VCC MAX6316 MAX6318 MAX6319 tRP VCC WDI GND RESET 100kΩ MAX6316/MAX6317 MAX6318/MAX6320 MAX6321 Figure 7. Watchdog Timing Relationship Figure 8.
PAGE 11
MAX6316–MAX6322 5-Pin µP Supervisory Circuits with Watchdog and Manual Reset Figure 10 shows an example of a flow diagram where the I/O driving the watchdog input is set high at the beginning of the program, set low at the end of every subroutine or loop, then set high again when the program returns to the beginning.
PAGE 12
MAX6316–MAX6322 5-Pin µP Supervisory Circuits with Watchdog and Manual Reset Table 1. Factory-Trimmed Reset Thresholds PART MIN 4.925 7.827 4.728 4.630 4.561 4.433 4.314 4.236 4.137 4.039 3.940 3.842 3.743 3.645 3.546 3.448 3.349 3.251 3.152 3.034 2.955 2.886 2.758 2.660 2.591 2.
PAGE 13
MAX6316–MAX6322 5-Pin µP Supervisory Circuits with Watchdog and Manual Reset Table 2. Standard Versions (continued) MINIMUM RESET TIMEOUT (ms) RESET THRESHOLD (V) PART TYPICAL WATCHDOG TIMEOUTS (s) SOT TOP MARK ACDN MAX6320PUK46CY-T 4.63 140 1.6 MAX6321HPUK46CY-T 4.63 140 1.6 ACGL MAX6322HPUK46C-T 4.63 140 1.6 ACGN Note: Thirteen standard versions are available, with a required order increment of 2500 pieces. Sample stock is generally held on standard versions only.
PAGE 14
MAX6316–MAX6322 5-Pin µP Supervisory Circuits with Watchdog and Manual Reset Revision History REVISION NUMBER REVISION DATE 0 1/98 Initial release. 1 4/98 Update to show MAX6319 as an existing part. 1, 2, 12 2 7/98 Update specifications, Selector Guide, and Table 2. 1, 12, 14 3 1/99 Include extended temperature range in EC table globals, Table 1, Ordering Information. 4 11/99 Update available products and versions in Table 2 and Ordering Information.