MAX820EPE

更新时间： 2024-11-10 11:14:43

品牌	Logo	应用领域
美信 - MAXIM		存储微处理器监控
页数	文件大小	规格书
16页	340K
描述
Microprocessor and Nonvolatile Memory Supervisory Circuits

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数据手册

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MAX820EPE 数据手册

19-0147; Rev. 4; 11/05

Microprocessor and Nonvolatile

Memory Supervisory Circuits

General Description

Features

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:

♦ 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

• µP reset: Assertion of RESET and RESET outputs during

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

RESET is guaranteed valid for V_CCdown to 1V.

♦ 10ns (max) Chip-Enable Gate Propagation Delay

♦ Voltage Monitor for Overvoltage Warning

• Manual-reset input.

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

comparator compares V_CCto a preset threshold

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

reset thresholds can be programmed externally.

♦

2% Reset and Low-Line Threshold Accuracy

(MAX820, external programming mode)

Ordering Information

• Watchdog fault output: Assertion of WDO if the watchdog

input is not toggled within a preset timeout

period.

PART**

TEMP. RANGE

0°C to +70°C

PIN-PACKAGE

16 Plastic DIP

16 Narrow SO

Dice*

MAX792_CPE

MAX792_CSE

MAX792_C/D

• Pulsed watchdog output: Advance warning of

impending WDO assertion from watchdog timeout that

causes hardware shutdown.

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.

• 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 ( 2ꢀ).

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

0.1µF

CE OUT

RESET IN/INT

µP

RAM

MAX792

ADDRESS

DECODER

CE IN

LLIN/

REFOUT

A0-A15

OVO

LOW LINE

RESET

NMI

OVI

RESET

SWT

GND

________________________________________________________________ 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.

12 3 4 5 6 7...16

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与MAX820EPE相关器件

型号	品牌	获取价格	描述	数据表
MAX820ESE	MAXIM	获取价格	Microprocessor and Nonvolatile Memory Supervisory Circuits
MAX820LC/D	MAXIM	获取价格	Power Supply Supervisor
MAX820LCPE	MAXIM	获取价格	Power Supply Supervisor
MAX820LCPE+	ROCHESTER	获取价格	1-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDIP16, LEAD FREE, PLASTIC, DIP-16
MAX820LCSE	MAXIM	获取价格	Power Supply Supervisor
MAX820LCSE+	MAXIM	获取价格	Power Supply Management Circuit, Fixed, 1 Channel, CMOS, PDSO16, 0.150 INCH, LEAD FREE, MS
MAX820LCSE+T	MAXIM	获取价格	Power Supply Management Circuit, Fixed, 1 Channel, CMOS, PDSO16, 0.150 INCH, LEAD FREE, MS
MAX820LCSE-T	MAXIM	获取价格	暂无描述
MAX820LEJE	MAXIM	获取价格	Power Supply Supervisor
MAX820LEPE	MAXIM	获取价格	Power Supply Supervisor

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