General Description

The MAX16056–MAX16059 are ultra-low-current 125nA

(typ) microprocessor (µP) supervisory circuits that mon-

itor a single system supply voltage. These devices

supply voltage drops below the factory-trimmed reset

threshold, manual reset is pulled low, or the watchdog

timer runs out (MAX16056/MAX16058). The reset output

remains asserted for an adjustable reset timeout period

trimmed reset threshold voltages are offered from

1.575V to 4.625V in approximately 100mV increments

(see Table 1).

These devices feature adjustable reset and watchdog

timeout using external capacitors. The MAX16056/

MAX16058 contain a watchdog timer with a watchdog

select input (WDS) that multiplies the watchdog timeout

period by 128. The MAX16057/MAX16059 do not have

the watchdog feature.

The MAX16056–MAX16059 are available in either push-

pull or open-drain output-type configurations (see the

Ordering Information and Selector Guide). These devices

are fully specified over the -40°C to +125°C automotive

temperature range. The MAX16056/MAX16058 are avail-

able in the 8-pin TDFN package, and the MAX16057/

MAX16059 are available in the 6-pin TDFN package.

Applications

Portable/Battery-Powered Equipment

PDAs/Cell Phones

MP3 Players/Pagers

Glucose Monitors/Patient Monitors

Metering/HVAC

Automotive Infotainment

Features

o Ultra-Low 125nA (typ) Supply Current

o 1.1V to 5.5V Operating Supply Range

o Factory-Set Reset Threshold Options from 1.575V

to 4.625V in Approximately 100mV Increments

o Capacitor-Adjustable Reset Timeout

o Capacitor-Adjustable Watchdog Timeout

(MAX16056/MAX16058)

o Watchdog Timer Capacitor Open Detect Function

o Optional Watchdog Disable Function

(MAX16056/MAX16058)

o Manual Reset Input

o Push-Pull or Open-Drain RESET Output Options

o Power-Supply Transient Immunity

o Small, 3mm x 3mm TDFN Package

125nA Supervisory Circuits with Capacitor-

Adjustable Reset and Watchdog Timeouts

________________________________________________________________

Maxim Integrated Products

1

1

12

3

65

4

34

86

5

WDI

SRT

MAX16056

MAX16058

MAX16057

MAX16059

2

7

WDS

SRT

N.C.

RESET

SWT

*EP

*EP

MR

GND

TDFN

TOP VIEW

TDFN

RESET

*CONNECT EXPOSED PAD TO GND.

MR

GND

Pin Configurations

Ordering Information

19-4686; Rev 0; 6/09

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

PART

PIN-

PACKAGE

RESET

OUTPUT

WATCH-

DOG

TIMER

MAX16056ATA_ _+T

8 TDFN-EP*

Push-Pull

Yes

MAX16057ATT_ _+T

6 TDFN-EP*

Push-Pull

No

MAX16058ATA_ _+T

8 TDFN-EP*

Open-Drain

Yes

MAX16059ATT_ _+T

6 TDFN-EP*

Open-Drain

No

Note: All devices are specified over the -40°C to +125°C oper-

ating temperature range.

+Denotes a lead(Pb)-free/RoHS-compliant package.

T = Tape and reel.

*EP = Exposed pad.

“_ _” represents the two number suffix needed when ordering

the reset threshold voltage value (see Table 1).

Standard versions and their package top marks are shown in

Table 3 at the end of data sheet.

Typical Operating Circuit appears at end of data sheet.