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MM74HC942N/A+

更新时间： 2024-11-20 13:00:19
品牌 Logo 应用领域
美国国家半导体 - NSC 调制解调器
页数 文件大小 规格书
8页 149K
描述
IC,MODEM CIRCUIT,MODEM,CMOS,DIP,20PIN,PLASTIC

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中文翻译

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MM74HC942N/A+ 技术参数

是否Rohs认证： 不符合生命周期：Obsolete
包装说明：DIP, DIP20,.3Reach Compliance Code：unknown
风险等级：5.92JESD-30 代码：R-PDIP-T20
JESD-609代码：e0负电源额定电压：-5 V
端子数量：20最高工作温度：85 °C
最低工作温度：-40 °C封装主体材料：PLASTIC/EPOXY
封装代码：DIP封装等效代码：DIP20,.3
封装形状：RECTANGULAR封装形式：IN-LINE
电源：+-5 V子类别：Modems
标称供电电压：5 V表面贴装：NO
技术：CMOS电信集成电路类型：MODEM
温度等级：INDUSTRIAL端子面层：Tin/Lead (Sn/Pb)
端子形式：THROUGH-HOLE端子节距：2.54 mm
端子位置：DUALBase Number Matches：1

MM74HC942N/A+ 数据手册

 浏览型号MM74HC942N/A+的Datasheet PDF文件第2页浏览型号MM74HC942N/A+的Datasheet PDF文件第3页浏览型号MM74HC942N/A+的Datasheet PDF文件第4页浏览型号MM74HC942N/A+的Datasheet PDF文件第5页浏览型号MM74HC942N/A+的Datasheet PDF文件第6页浏览型号MM74HC942N/A+的Datasheet PDF文件第7页 
January 1988  
MM74HC942 300 Baud Modem  
General Description  
Features  
Y
Y
Y
Drives 600X at 0 dBm  
The MM74HC942 is a full duplex low speed modem. It pro-  
vides a 300 baud bidirectional serial interface for data com-  
munication over telephone lines and other narrow band-  
width channels. It is Bell 103 compatible.  
All filters on chip  
Transmit level adjustment compatible with universal  
service order code  
Y
Y
Y
Y
Y
Y
Y
The MM74HC942 utilizes advanced silicon-gate CMOS  
technology. Switched capacitor techniques are used to per-  
form analog signal processing.  
TTL and CMOS compatible logic  
All inputs protected against static damage  
g
5V supplies  
Low power consumption  
MODULATOR SECTION  
Full duplex answer or originate operation  
Analog loopback for self test  
Power down mode  
The modulator contains a frequency synthesizer and a sine  
wave synthesizer. It produces a phase coherent frequency  
shift keyed (FSK) output.  
LINE DRIVER AND HYBRID SECTION  
Applications  
Y
The line driver and hybrid are designed to facilitate connec-  
tion to a 600X phone line. They can perform two-to-four-  
wire conversion and drive the line at a maximum of 0 dBm.  
Built-in low speed modems  
Y
Remote data collection  
Y
Radio telemetry  
DEMODULATOR SECTION  
Y
Credit verification  
The demodulator incorporates anti-aliasing filters, a receive  
filter, limiter, discriminator, and carrier detect circuit. The  
nine pole receive filter provides 60 dB of transmitted tone  
rejection. The discriminator is fully balanced for stable  
operation.  
Y
Stand-alone modems  
Y
Point-of-sale terminals  
Y
Tone signalling systems  
Y
Remote process control  
TRI-STATEÉ is a registered trademark of National Semiconductor Corp.  
Connection and Block Diagrams  
Dual-In-Line Package  
TL/F/5348–1  
Top View  
Order Number MM54HC942 or  
MM74HC942  
TL/F/5348–2  
C
1995 National Semiconductor Corporation  
TL/F/5348  
RRD-B30M105/Printed in U. S. A.  
12345678

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