MAX791CSE-T Maxim Integrated Products, MAX791CSE-T Datasheet

MAX791CSE-T

Manufacturer Part Number

MAX791CSE-T

Description

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX791CSE-T.pdf (19 pages)

Specifications of MAX791CSE-T

Package

SOP-16

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Download datasheet (417Kb)

The MAX791 microprocessor (µP) supervisory circuit

reduces the complexity and number of components need-

ed to monitor power-supply and battery-control functions

in µP systems. The 50µA supply current makes the

MAX791 ideal for use in portable equipment, while the 6ns

chip-enable propagation delay and 250mA output capa-

bility (25mA in battery-backup mode) make it suitable for

larger, higher-performance equipment.

The MAX791 comes in 16-pin DIP, TSSOP, and narrow SO

packages and provides the following functions:

• µP reset.

• Manual-reset input.

• A 1.25V threshold detector provides for power-fail

• Two-stage power-fail warning. A separate low-line

• Backup-battery switchover for CMOS RAM, real-time

• Software monitoring of backup-battery voltage.

• A watchdog-fault output is asserted if the watchdog

• Write protection of CMOS RAM or EEPROM.

• Pulsed watchdog output to give advance warning of

19-0075; Rev. 7; 11/05

MaxCap is a registered trademark of Cesiwid Inc. SuperCap is a registered trademark of Baknor Industries.

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

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

Computers

Controllers

Portable/Battery-

Powered Equipment

power-down, and brownout conditions, and is guaran-

teed to be in the correct state for V

even with no battery in the circuit.

warning and low-battery detection, or monitors a

power supply other than +5V.

comparator compares V

above the reset threshold.

clocks, µPs, or other low-power logic.

input has not been toggled within either a preset or

an adjustable timeout period.

impending

TOP VIEW

–

—

BATT ON

–

—

VBATT

—

GND

SWT

PFO

—

OUT

PFI

—

________________________________________________________________ Maxim Integrated Products

–

assertion caused by watchdog timeout.

output is asserted during power-up,

DIP/SO/TSSOP

General Description

MAX791

Critical µP Power Monitoring

Intelligent Instruments

Pin Configuration

Microprocessor Supervisory Circuit

to a threshold 150mV

Applications

WDPO

RESET

WDO

CE IN

CE OUT

WDI

LOWLINE

down to 1V,

♦ Precision 4.65V Voltage Monitoring

♦ 200ms Power-OK / Reset Time Delay

♦ Independent Watchdog Timer—Preset or Adjustable

♦ 1µA Standby Current

♦ Power Switching

♦ On-Board Gating of Chip-Enable Signals

♦ MaxCap

♦ Voltage Monitor for Power-Fail or Low-Battery Warning

♦ Backup-Battery Monitor

♦ Guaranteed

* Dice are specified at T

Devices in PDIP, SO and TSSOP packages are available in both

leaded and lead-free packaging. Specify lead free by adding

the + symbol at the end of the part number when ordering.

Lead free not available for CERDIP package.

MAX791CPE

MAX791CSE

MAX791C/D

MAX791CUE

MAX791EPE

MAX791ESE

MAX791EJE

MAX791EUE

MAX791MJE

RESET SOURCES

OTHER SYSTEM

PART

* MaxCap

250mA Output in V

25mA Output in Battery-Backup Mode

Memory Write-Cycle Completion

6ns CE Gate Propagation Delay

+5V

0.1µF

 

0.47F*

+12V

+12V SUPPLY

or SuperCap

FAILURE

–

—

Typical Operating Circuit

—

-40°C to +85°C

-55°C to +125°C

—

TEMP RANGE

VBATT

PFI

PFO

GND

0°C to +70°C

–

Valid to V

Ordering Information

= +25°C.

MAX791

BATT

 

LOWLINE

CE OUT

Compatible

RESET

Mode

CE IN

WDO

SWT

WDI

OUT

ADDRESS

DECODE

= 1V

0.1µF

16 Plastic DIP

16 Narrow SO

16 TSSOP

16 Plastic DIP

16 Narrow SO

16 CERDIP

16 TSSOP

16 CERDIP

Dice*

PIN-PACKAGE

Features

I/O

NMI

RESET

INT

A0–A15

µP

CMOS

RAM

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