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LM79CCVFX

更新时间： 2024-11-23 19:34:55
品牌 Logo 应用领域
德州仪器 - TI /
页数 文件大小 规格书
31页 472K
描述
SPECIALTY ANALOG CIRCUIT, PQFP44, 10 X 10 MM, PLASTIC, QFP-44

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LM79CCVFX 技术参数

生命周期：Obsolete包装说明：QFP,
Reach Compliance Code：unknownHTS代码：8542.39.00.01
风险等级：5.58模拟集成电路 - 其他类型：ANALOG CIRCUIT
JESD-30 代码：S-PQFP-G44长度：10 mm
功能数量：1端子数量：44
最高工作温度：125 °C最低工作温度：-55 °C
封装主体材料：PLASTIC/EPOXY封装代码：QFP
封装形状：SQUARE封装形式：FLATPACK
认证状态：Not Qualified座面最大高度：2.45 mm
最大供电电压 (Vsup)：5.75 V最小供电电压 (Vsup)：4.25 V
标称供电电压 (Vsup)：5 V表面贴装：YES
温度等级：MILITARY端子形式：GULL WING
端子节距：0.8 mm端子位置：QUAD
宽度：10 mmBase Number Matches：1

LM79CCVFX 数据手册

 浏览型号LM79CCVFX的Datasheet PDF文件第2页浏览型号LM79CCVFX的Datasheet PDF文件第3页浏览型号LM79CCVFX的Datasheet PDF文件第4页浏览型号LM79CCVFX的Datasheet PDF文件第5页浏览型号LM79CCVFX的Datasheet PDF文件第6页浏览型号LM79CCVFX的Datasheet PDF文件第7页 
February 2000  
LM79  
Microprocessor System Hardware Monitor  
General Description  
Features  
n Temperature sensing  
The LM79 is a highly integrated Data Acquisition system for  
hardware monitoring of servers, Personal Computers, or vir-  
tually any microprocessor based system. In a PC, the LM79  
can be used to monitor power supply voltages, tempera-  
tures, and fan speeds. Actual values for these inputs can be  
n 5 positive voltage inputs  
n 2 op amps for negative voltage monitoring  
n 3 fan speed monitoring inputs  
n Input for additional temperature sensors  
n Chassis Intrusion Detector input  
™
read at any time, and programmable WATCHDOG limits in  
the LM79 activate a fully programmable and maskable inter-  
rupt system with two outputs.  
n WATCHDOG comparison of all monitored values  
n POST code storage RAM  
The LM79 has an on-chip temperature sensor, 5 positive  
analog inputs, two inverting inputs (for monitoring negative  
voltages), and an 8-bit ADC. An input is provided for the  
overtemperature outputs of additional temperature sensors  
and this is linked to the interrupt system. The LM79 provides  
inputs for three fan tachometer outputs. Additional inputs are  
provided for Chassis Intrusion detection circuits, 5 VID moni-  
tor inputs, and chainable interrupt. The LM79 provides both  
ISA and Serial Bus interfaces. A 32-byte auto-increment  
RAM is provided for POST (Power On Self Test) code stor-  
age.  
2
™
n ISA and I C Serial Bus interfaces  
Key Specifications  
±
%
(max)  
n Voltage monitoring accuracy  
1
n Temperature Accuracy  
±
−10˚C to +100˚C  
3˚C (max)  
5V  
n Supply Voltage  
n Supply Current  
Operating:  
Shutdown:  
1 mA typ  
10 µA typ  
8 Bits  
Compared to the LM78, the LM79 has the following differ-  
ences:  
n ADC Resolution  
•
•
•
an additional VID input pin  
Applications  
n System Hardware Monitoring for Servers and PCs  
n Office Electronics  
an additional register for device identification  
open drain Power Switch Bypass Output  
n Electronic Test Equipment and Instrumentation  
Ordering Information  
Connection Diagram  
Temperature Range  
Package  
−10˚C ≤ TA ≤ +100˚C  
Order Number  
Device Marking  
LM79CCVF  
LM79CCVF  
VGZ44A  
#
Indicates Active Low (“Not”)  
DS100036-2  
TRI-STATE® is a registered trademark of National Semiconductor Corporation.  
™
WATCHDOG is a trademark of National Semiconductor Corporation.  
2
I
C® is a registered trademark of the Phillips Corporation.  
© 2000 National Semiconductor Corporation  
DS100036  
www.national.com  
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