MAX698EWE+T [MAXIM]

Power Supply Support Circuit, Fixed, 1 Channel, +4.65VV, CMOS, PDSO16, LEAD FREE, SO-16;


型号：	MAX698EWE+T
厂家：	MAXIM INTEGRATED PRODUCTS
描述：	Power Supply Support Circuit, Fixed, 1 Channel, +4.65VV, CMOS, PDSO16, LEAD FREE, SO-16 光电二极管
文件：	总5页 (文件大小：172K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

MAX698/MAX699

Low-Cost, Power-On Reset

and Watchdog Controllers

General Description

Features

The MAX698/MAX699 monitor the +5V supply in micro-

processor (µP) and digital systems. They supply a

RESET pulse of at least 140ms duration on power-up,

power-down, and during low-voltage brownout condi-

tions. Circuit reliability is increased at reduced cost by

eliminating all external components and adjustments.

o Precision Voltage Monitor

o Power-OK/Reset Time Delay

o Watchdog Timer

o Minimum Component Count

The MAX699 includes all features of the MAX698, but

also provides a watchdog input to monitor microproces-

sor activity. The RESET output goes low if the watchdog

input (WDI) is not toggled within 1 second. The watch-

dog feature can be disabled by leaving WDI open.

Ordering Information

PART*

MAX698CPA

MAX698CWE

MAX698EPA

MAX698EWE

MAX699CPA

MAX699CWE

MAX699EPA

MAX699EWE

TEMP RANGE

0°C to +70°C

-40°C to +85°C

0°C to +70°C

-40°C to +85°C

PIN-PACKAGE

8 PDIP

Both parts are supplied in 8-lead PDIP and 16-lead

0.3in wide small outline (SO) packages and are speci-

fied from 0°C to +70°C for C grade devices and -40°C

to +85°C for E devices. The SO versions, with more

pins than the 8-lead PDIP, have additional outputs not

available in DIP packages. These are RESET (without

inversion) and watchdog output (WDO).

16 Wide SO

8 PDIP

16 Wide SO

8 PDIP

16 Wide SO

8 PDIP

Applications

16 Wide SO

Computers

*Devices are available in both leaded and lead(Pb)-free pack-

aging. Specify lead free by adding the + symbol at the end of

the part number when ordering.

Controllers

Intelligent Instruments

Automotive Systems

Critical µP Power Monitoring

Pin Configuration

TOP VIEW

GND

RESET

N.C. (WDI)*

N.C.

Typical Operating Circuit

MAX698

MAX699*

GND

+5V

DIP

GND

RESET

N.C.

RESET

GND

MAX698

TO µP

RESET

INPUT

N.C. (WDO)*

N.C.

MAX698

MAX699*

GND

N.C.

N.C. (WDI)*

N.C.

GND

* PIN LABELS IN ( ) ARE FOR MAX699 ONLY

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

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

19-2349; Rev 4; 5/13

MAX698/MAX699

Low-Cost, Power-On Reset

and Watchdog Controllers

ABSOLUTE MAXIMUM RATINGS

........................................................................-0.3V to +6.0V

Power Dissipation (T = +70°C)

Input Voltage (with respect to GND)

WDI, WDO, RESET, RESET ..…………………………-0.3V to V

Operating Temperature Range

C Suffix………………………………………………0°C to +70°C

E Suffix......……………………………………….-40°C to +85°C

8-Pin PDIP (derated 5mW/°C above +70°C).....………400mW

16-Pin SO (derated 7mW/°C above +70°C) ................600mW

Storage Temperature Range.............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

Rate of Rise, V .................………………………………100V/µs

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

= +5V, T = +25°C, unless otherwise noted.)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Operating Voltage Range

= full

3.0

5.5

Supply Current

Power-Up Reset Deassertion

Power-Up Reset Assertion

Hysteresis

= full

4.50

4.4

4.65

4.75

Reset Output Pulse Width

140

3.5

500

0.4

Output low

Output high

Output low

Output high

Output low

Output high

= 1.6mA, V

= 4.4V

SINK

RESET OUTPUT (Open Drain)

= 1µA, V

= 5V

SOURCE

= 1.6mA, V

= 5V

0.4

SINK

RESET OUTPUT (SO Package

Only)

= 1µA, V

= 4.4V

SOURCE

= 1.6mA, V

= 5V

SINK

WDO Output (MAX699 SO

Package Only)

= 1µA, V

= 4.4V

3.5

SOURCE

MAX699 Watchdog Timeout

Period

1.00

1.6

2.25

MAX699 Minimum WDI Input

Pulse Width

200

Locic-low

0.8

MAX699 WDI Input Threshold

MAX699 WDI Input Current

= +5V

Logic-high

3.8

-50

WDI = V

µA

WDI = 0V

-15

Maxim Integrated

MAX698/MAX699

Low-Cost, Power-On Reset

and Watchdog Controllers

Pin Description

NAME

FUNCTION

1, 4, 9

PDIP

3, 4, 8

1, 2

GND

Chip Power Ground

2, 3

+5V Sense Input and MAX698/MAX699 Chip Power

No Connection

5–8, 10–14

5, 6

N.C.

(MAX699 Only.) A three-level input. If WDI remains high or low for

more than the watchdog timeout period, RESET pulses low (WDO

also goes low on the MAX699 SO package). If WDI is unconnected,

the watchdog circuit is disabled.

WDI (MAX699 Only)

(MAX699 Only.) Goes low when WDI remains high or low for more

than the watchdog timeout period. WDO is set high at the next WDI

transition. If WDI is unconnected or at midsupply, WDO remains high.

—

WDO (MAX699 Only)

WDO also remains high when V

falls below 4.4V.

Goes low when V

Electrical Characteristics table).

falls below internally set threshold (see the

RESET

—

RESET

Goes high when V

falls below internally set threshold.

WATCHDOG

TIMER

WDI*

WDO*

RESET

TIMER

RESET*

POWER-ON

RESET

MAX698

MAX699

4.65V

*WDI ON MAX699 ONLY

RESET ON SO PACKAGE ONLY

WDO ON SO MAX699 ONLY

GND

Figure 1. Block Diagram

Maxim Integrated

MAX698/MAX699

Low-Cost, Power-On Reset

and Watchdog Controllers

Package Information

Chip Topography

For the latest package outline information and land patterns (foot-

prints), go to www.maximintegrated.com/packages. Note that a

“+”, “#”, or “-” in the package code indicates RoHS status only.

Package drawings may show a different suffix character, but the

drawing pertains to the package regardless of RoHS status.

LAND

PATTERN NO.

PACKAGE

TYPE

PACKAGE

CODE

OUTLINE NO.

—

8 PDIP

P8-2

21-0043

21-0042

90-0107

16 Wide SO

W16-1

Maxim Integrated

MAX698/MAX699

Low-Cost, Power-On Reset

and Watchdog Controllers

Revision History

REVISION REVISION

PAGES

DESCRIPTION

CHANGED

NUMBER

DATE

5/13

Corrected WDI SO pin number in Pin Description

Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent

licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and

max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.

Maxim Integrated 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000 _________________________________ 5

Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.

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