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參數資料
| 型號： | MAX820_MJE |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Microprocessor and Non-Volatile Memory Supervisory Circuits |
| 中文描述： | 微處理器和非揮發性內存監控電路 |
| 文件頁數： | 1/16頁 |
| 文件大小： | 250K |
| 代理商： | MAX820_MJE |
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
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MAX820MMJE | 功能描述:監控電路 RoHS:否 制造商:STMicroelectronics 監測電壓數: 監測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX820RC/D | 功能描述:監控電路 RoHS:否 制造商:STMicroelectronics 監測電壓數: 監測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX820RCPE | 功能描述:監控電路 RoHS:否 制造商:STMicroelectronics 監測電壓數: 監測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX820RCPE+ | 功能描述:監控電路 MPU & NV Memory Supervisor RoHS:否 制造商:STMicroelectronics 監測電壓數: 監測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| MAX820RCSE | 功能描述:監控電路 RoHS:否 制造商:STMicroelectronics 監測電壓數: 監測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
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