MAX792REJE+ datasheet, PDF - EEWORLD Datasheet

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MAX792REJE+: DescriptionSupervisory Circuits; Categorysemiconductor Power management; File Size337KB，16 Pages; ManufacturerMaxim; Websitehttps://www.maximintegrated.com/en.html

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MAX792REJE+ Overview

Supervisory Circuits

MAX792REJE+ Parametric

Parameter Name	Attribute value
Product Attribute	Attribute Value
Manufacturer	Maxim
Product Category	Supervisory Circuits
Type	Voltage Supervisory
Mounting Style	Through Hole
Package / Case	CDIP-Narrow-16
Threshold Voltage	2.75 V to 5.5 V
Number of Inputs Monitored	1 Input
Output Type	Active High, Active Low, Push-Pull
Manual Reset	Manual Reset
Watchdog Timers	Watchdog
Battery Backup Switching	No Backup
Reset Delay Time	280 ms
Supply Voltage - Max	5.5 V
Maximum Operating Temperature	+ 85 C
Minimum Operating Temperature	- 40 C
Height	3.3 mm
Length	21.34 mm (Max)
Width	7.87 mm
Overvoltage Threshold	2.7 V
Undervoltage Threshold	2.55 V
Chip Enable Signals	Chip Enable
Operating Supply Current	150 uA
Pd - Power Dissipation	800 mW
Power Fail Detection	Yes
Supply Voltage - Min	2.75 V

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19-0147; Rev. 4; 11/05

Microprocessor and Nonvolatile

Memory Supervisory Circuits

General Description

The MAX792/MAX820 microprocessor (µP) supervisory

circuits provide the most functions for power-supply

and watchdog monitoring in systems without battery

backup. Built-in features include the following:

• µP reset: Assertion of RESET and

RESET

outputs during

power-up, power-down, and brownout conditions.

RESET

is guaranteed valid for V

down to 1V.

• Manual-reset input.

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

comparator compares V

to a preset threshold

120mV above the reset threshold; the low-line and

reset thresholds can be programmed externally.

• Watchdog fault output: Assertion of

WDO

if the watchdog

input is not toggled within a preset timeout

period.

• Pulsed watchdog output: Advance warning of

impending

WDO

assertion from watchdog timeout that

causes hardware shutdown.

• Write protection of CMOS RAM, EEPROM, or other

memory devices.

The MAX792 and MAX820 are identical, except the

MAX820 guarantees higher low-line and reset threshold

accuracy (±2%).

Features

♦

Manual-Reset Input

♦

200ms Power-OK / Reset Time Delay

♦

Independent Watchdog Timer—Preset or Adjustable

♦

On-Board Gating of Chip-Enable Signals

Memory Write-Cycle Completion

10ns (max) Chip-Enable Gate Propagation Delay

Voltage Monitor for Overvoltage Warning

±2% Reset and Low-Line Threshold Accuracy

(MAX820, external programming mode)

MAX792/MAX820

Ordering Information

PART**

MAX792_CPE

MAX792_CSE

MAX792_C/D

TEMP. RANGE

0°C to +70°C

PIN-PACKAGE

16 Plastic DIP

16 Narrow SO

Dice*

Ordering Information continued at end of data sheet.

Dice are tested at T

= +25°C, DC parameters only.

**These

parts offer a choice of five different reset threshold voltages.

Select the letter corresponding to the desired nominal reset threshold

voltage and insert it into the blank to complete the part number.

Devices in PDIP, SO and µMAX packages are available in both lead-

ed and lead-free packaging. Specify lead free by adding the + sym-

bol at the end of the part number when ordering. Lead free not avail-

able for CERDIP package.

Applications

Computers

Controllers

Intelligent Instruments

Critical µP Power Monitoring

SUFFIX

RESET THRESHOLD (V)

4.62

4.37

3.06

2.91

2.61

Typical Operating Circuit

CE OUT

RESET IN/INT

0.1µF

µP

MAX792

LLIN/

REFOUT

CE IN

OVO

LOW LINE

OVI

SWT

GND

RESET

GND

NMI

RESET

ADDRESS

DECODER

RAM

A0-A15

________________________________________________________________

Maxim Integrated Products

For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.

For small orders, phone 1-800-835-8769.

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