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L3845B PDF预览

L3845B

更新时间: 2024-11-24 22:31:51
品牌 Logo 应用领域
意法半导体 - STMICROELECTRONICS 电信集成电路电信电路光电二极管
页数 文件大小 规格书
7页 60K
描述
TRUNK INTERFACE

L3845B 技术参数

是否无铅: 不含铅是否Rohs认证: 符合
生命周期:Obsolete零件包装代码:DIP
包装说明:MINI, DIP-8针数:8
Reach Compliance Code:compliantHTS代码:8542.39.00.01
Factory Lead Time:12 weeks风险等级:5.63
JESD-30 代码:R-PDIP-T8JESD-609代码:e3
功能数量:1端子数量:8
最高工作温度:70 °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:DIP8,.3封装形状:RECTANGULAR
封装形式:IN-LINE峰值回流温度(摄氏度):NOT SPECIFIED
电源:20 V认证状态:Not Qualified
座面最大高度:5.08 mm子类别:Analog Transmission Interfaces
标称供电电压:20 V表面贴装:NO
电信集成电路类型:TELECOM CIRCUIT温度等级:OTHER
端子面层:Matte Tin (Sn)端子形式:THROUGH-HOLE
端子节距:2.54 mm端子位置:DUAL
处于峰值回流温度下的最长时间:NOT SPECIFIED宽度:7.62 mm
Base Number Matches:1

L3845B 数据手册

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L3845  
TRUNK INTERFACE  
ON CHIP POLARITYGUARD  
MEETS DC LINE CHARACTERISTICS OF  
EITHER CCITT AND EIA RS 464 SPECS  
PULSE FUNCTION  
HIGH AC IMPEDANCE  
OFF HOOK-STATUS DETECTION OUTPUT  
LOW EXTERNAL COMPONENT COUNT  
Minidip  
SO8  
DESCRIPTION  
The circuit provides DC loop termination for ana-  
log trunklines.  
ORDERING NUMBERS:  
L3845B  
L3845D  
The V-I characteristics is equivalent to a fixed  
voltage drop (zener like characteristic) in series  
with an external resistance that determines the  
slope of the DC characteristic.  
An external low voltage electrolytic capacitor  
causes the circuit to exhibit a very high imped-  
ance to all AC signal above a minimum frequency  
that is determinedby the capacitor itself and by a  
20 K nominal resistor integrated on the chip.  
The Off-Hook status is detected all the time a  
typic of 8 mA is flowing into the circuit. In this con-  
dition a constant current generator is activated to  
supply an external device (typically an optocou-  
pler) without affecting the AC characteristic of the  
circuit.  
When Pulse Dialing is required the PULSE input  
(pin 3) connected to V- causes the device to re-  
duce the fixed DC voltage drop and to exhibit a  
pure resistive impedance equal to the external re-  
sistor.  
BLOCK DIAGRAM  
8
1
V+  
IN1  
3
PULSE  
DC LINE  
TERMINATION  
POLARITY  
GUARD  
OF HOOK  
DETECTION  
CIRCUIT  
4
HD0  
7
IN2  
5
6
2
ACT  
DCT  
V-  
R2  
R3  
C1  
S2  
R1  
S1  
D96TL263  
1/7  
June 1996  
This is advanced information on a new product now in development or undergoingevaluation. Details are subject to change without notice.  

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