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參數資料
| 型號： | MAX794 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 3.0V/3.3V Adjustable Microprocessor Supervisory Circuits(具有可調閾值監控器、芯片使能和支持備用電池的復位器) |
| 中文描述： | 3.0V/3.3V可調、微處理器監控電路 |
| 文件頁數： | 1/20頁 |
| 文件大小： | 211K |
| 代理商： | MAX794 |
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
_______________General Desc ription
The MAX793/MAX794/MAX795 microprocessor (μP)
supervisory circuits monitor and control the activities of
+3.0V/+3.3V μPs by providing backup-battery switchover,
among other features such as low-line indication, μP
reset, write protection for CMOS RAM, and a watchdog
(see the Selector Guide below). The backup-battery volt-
age can exceed V
CC
, permitting the use of 3.6V lithium
batteries in systems using 3.0V to 3.3V for V
CC
.
The MAX793/MAX795 offer a choice of reset threshold
voltage range (denoted by suffix letter): 3.00V to 3.15V
(T), 2.85V to 3.00V (S), and 2.55V to 2.70V (R). The
MAX794’s reset threshold is set externally with a resistor
divider. The MAX793/MAX794 are available in 16-pin
DIP and narrow SO packages, and the MAX795 comes
in 8-pin DIP and SO packages. For similar devices
designed for 5V systems, see the μP Supervisory
Circuits table at the back of this data sheet.
________________________Applic ations
Battery-Powered Computers and Controllers
Embedded Controllers
Intelligent Controllers
Critical μP Power Monitoring
Portable Equipment
____________________________Features
MAX793/MAX794/MAX795
o
Precision Supply-Voltage Monitor:
Fixed Reset Trip Voltage (MAX793/MAX795)
Adjustable Reset Trip Voltage (MAX794)
o
Guaranteed Reset Assertion to V
CC
= 1V
o
Backup-Battery Power Switching—Battery
Voltage Can Exceed V
CC
o
On-Board Gating of Chip-Enable Signals—7ns
Max Propagation Delay
MAX793/MAX794 Only
o
Battery Freshness Seal
o
Battery OK Output (MAX793)
o
Uncommitted Voltage Monitor for Power-Fail or
Low-Battery Warning
o
Independent Watchdog Timer (1.6sec timeout)
o
Manual Reset Input
______________Ordering Information
Ordering Information continued on last page.
* The MAX793/MAX795 offer a choice of reset threshold voltage.
Select the letter corresponding to the desired reset threshold
voltage range (T = 3.00V to 3.15V, S = 2.85V to 3.00V, R = 2.55V
to 2.70V) and insert it into the blank to complete the part number.
The MAX794’s reset threshold is adjustable.
__________Typic al Operating Circ uit
M
3.0V /3.3V Adjustable Mic roproc essor
S upervisory Circ uits
________________________________________________________________ Maxim Integrated Products
1
MAX793
RESET
BATT OK
LOWLINE
WDI
CE IN
CE OUT
3.0V OR 3.3V
+5V
BATT
A0-A15
MR
+5V SUPPLY
FAILURE
BATT ON
PFI
WDO
OUT
CMOS
RAM
ADDRESS
DECODER
0.1
μ
F
PMOS
0.1
μ
F
V
CC
PFO
GND
I/O
NMI
μ
P
RESET
V
CC
V
CC
0.1
μ
F
3.6V
(OPTIONAL)
Si9433DY
SILICONIX
19-0366; Rev 1; 1/96
PART*
MAX793
_CPE
MAX793_CSE
MAX793_EPE
MAX793_ESE
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
TEMP. RANGE
PIN-PACKAGE
16 Plastic DIP
16 Narrow SO
16 Plastic DIP
16 Narrow SO
FEATURE
Active-Low Reset
Active-High Reset
Programmable Reset
Threshold
Low-Line Early Warning
Output
MAX793
MAX794
MAX795
Backup-Battery
Switchover
External Switch Driver
Power-Fail Comparator
Battery OK Output
Watchdog Input
Battery Freshness Seal
Manual Reset Input
Chip-Enable Gating
Pins-Package
_____________________S elec tor Guide
16-DIP/SO 16-DIP/SO
8-DIP/SO
Pin Configurations appear at end of data sheet.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MAX794CPE | 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 |
| MAX794CPE+ | 功能描述:監控電路 3/3.3/AdjV MPU 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 |
| MAX794CSE | 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 |
| MAX794CSE+ | 功能描述:監控電路 3/3.3/AdjV MPU 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 |
| MAX794CSE+T | 功能描述:監控電路 3/3.3/AdjV MPU 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 |
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