參數(shù)資料
型號(hào)： MAX820
廠商： Maxim Integrated Products, Inc.
英文描述： Microprocessor and Non-Volatile Memory Supervisory Circuits
中文描述： 微處理器及非易失存儲(chǔ)器監(jiān)控電路
文件頁(yè)數(shù)： 1/16頁(yè)
文件大小： 250K
代理商： MAX820
M
Mic roproc essor and Non-Volatile
Memory S upervisory Circ uits
________________________________________________________________ Maxim Integrated Products
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
1
19-0147; Rev. 2; 6/98
General Desc ription
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:
1)
μP reset: Assertion of RESET and
RESET
outputs dur-
ing power-up, power-down, and brownout condi-
tions.
RESET
is guaranteed valid for V
CC
down to 1V.
2)
Manual-reset input.
3)
Two-stage power-fail warning: A separate low-line
comparator compares V
CC
to a preset threshold
120mV above the reset threshold; the low-line and
reset thresholds can be programmed externally.
4)
Watchdog fault output: Assertion of
WDO
if the watch-
dog input is not toggled within a preset timeout
period.
5)
Pulsed watchdog output: Advance warning of
impending
WDO
assertion from watchdog timeout
that causes hardware shutdown.
6)
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%).
Applic ations
Computers
Controllers
Intelligent Instruments
Critical μP Power Monitoring
Features
o
Manual-Reset Input
o
200ms Power-OK/Reset Time Delay
o
Independent Watchdog Timer—Preset or Adjustable
o
On-Board Gating of Chip-Enable Signals
o
Memory Write-Cycle Completion
o
10ns (max) Chip-Enable Gate Propagation Delay
o
Voltage Monitor for Overvoltage Warning
o
±2% Reset and Low-Line Threshold Accuracy
(MAX820, external programming mode)
Ordering Information continued at end of data sheet.
*Dice are tested at T
A
= +25°C, DC parameters only.
**These parts offer a choice of five different reset threshold volt-
ages. Select the letter corresponding to the desired nominal
reset threshold voltage and insert it into the blank to complete the
part number.
SUFFIX
L
M
T
S
R
MAX792
4
5
7
8
9
1
10
6
14
ADDRESS
DECODER
RESET IN/INT
LLIN/
REFOUT
OVI
SWT
3
V
CC
GND
12
MR
RESET
LOW LINE
OVO
CE IN
CE OUT
0.1μF
V
CC
RAM
A0-A15
V
CC
GND
NMI
RESET
μ
P
13
Typic al Operating Circ uit
PART**
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
PIN-PACKAGE
16 Plastic DIP
16 Narrow SO
Dice*
MAX792
_CPE
MAX792_CSE
MAX792_C/D
RESET THRESHOLD (V)
4.62
4.37
3.06
2.91
2.61
Ordering Information
相關(guān)PDF資料
PDF描述
MAX820_CPE Microprocessor and Non-Volatile Memory Supervisory Circuits
MAX820_CSE Microprocessor and Non-Volatile Memory Supervisory Circuits
MAX820_EJE Microprocessor and Non-Volatile Memory Supervisory Circuits
MAX820_EPE Microprocessor and Non-Volatile Memory Supervisory Circuits
MAX820_ESE Microprocessor and Non-Volatile Memory Supervisory Circuits
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX820_CPE 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Microprocessor and Non-Volatile Memory Supervisory Circuits
MAX820_CSE 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Microprocessor and Non-Volatile Memory Supervisory Circuits
MAX820_EJE 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Microprocessor and Non-Volatile Memory Supervisory Circuits
MAX820_EPE 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Microprocessor and Non-Volatile Memory Supervisory Circuits
MAX820_ESE 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Microprocessor and Non-Volatile Memory Supervisory Circuits
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