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DP84900 PDF预览

DP84900

更新时间: 2024-02-24 01:57:12
品牌 Logo 应用领域
其他 - ETC /
页数 文件大小 规格书
12页 167K
描述

DP84900 技术参数

是否Rohs认证: 不符合生命周期:Obsolete
包装说明:SOP,Reach Compliance Code:unknown
风险等级:5.92接口集成电路类型:DATA SYNCHRONIZER OR ENDEC
JESD-30 代码:R-PDSO-G20JESD-609代码:e0
长度:12.8 mm功能数量:1
端子数量:20最高工作温度:70 °C
最低工作温度:封装主体材料:PLASTIC/EPOXY
封装代码:SOP封装形状:RECTANGULAR
封装形式:SMALL OUTLINE峰值回流温度(摄氏度):NOT SPECIFIED
认证状态:Not Qualified座面最大高度:2.65 mm
最大供电电压:5.5 V最小供电电压:4.5 V
标称供电电压:5 V表面贴装:YES
温度等级:COMMERCIAL端子面层:Tin/Lead (Sn/Pb)
端子形式:GULL WING端子节距:1.27 mm
端子位置:DUAL处于峰值回流温度下的最长时间:NOT SPECIFIED
宽度:7.5 mmBase Number Matches:1

DP84900 数据手册

 浏览型号DP84900的Datasheet PDF文件第2页浏览型号DP84900的Datasheet PDF文件第3页浏览型号DP84900的Datasheet PDF文件第4页浏览型号DP84900的Datasheet PDF文件第5页浏览型号DP84900的Datasheet PDF文件第6页浏览型号DP84900的Datasheet PDF文件第7页 
PRELIMINARY  
June 1993  
DP84900 1,7 Encoder/Decoder Circuit  
General Description  
Features  
Y
Operates at Non-Return to Zero (NRZ) data rates up to  
25 Mbits/second  
The DP84900 is designed to perform the encoding and de-  
coding for disk memory systems. It is designed to interface  
directly with National Semiconductor’s integrated read  
channel circuits such as the DP8492. This Encoder/  
Decoder (ENDEC) circuit employs a 2/3 (1,7) Run Length  
Limited (RLL) code type and supports hard sectored format.  
Y
Y
a
Single 5V power supply operation  
Low Power dissipationÐ110 mW at 25 Mbits/sec NRZ  
rate  
Y
Y
TTL compatible inputs and outputs  
Supports write data precompensation with Early, Late  
and Level (PCOMP3T) output signals  
Power Down Mode included  
The ENDEC also includes write data precompensation cir-  
cuitry which detects the need for precompensation. This cir-  
cuitry issues early, late and level (PCOMP3T) output signals  
necessary for two levels of precompensation. Precompen-  
sation information is generated against both the 2T and 3T  
patterns. The precompensation circuitry can be bypassed  
by the setting of a bit in the control register.  
Y
Y
DC-erasure is available to support analog flaw map  
testing  
Y
Bypass mode available which permits un-encoded test  
patterns to be issued at the CODEOUT pin  
A control register is included to configure the ENDEC and to  
select several device operation options such as output code  
inversion and TRI-STATE of the NRZ output.  
É
The DP84900 is available in a 20-pin SO and SSO package.  
Block Diagram  
TL/F/11420–1  
FIGURE 1. ENDEC Block Diagram  
TRI-STATEÉ is a registered trademark of National Semiconductor Corporation.  
IBMÉ is a registered trademark of International Business Machines Corporation.  
C
1995 National Semiconductor Corporation  
TL/F/11420  
RRD-B30M105/Printed in U. S. A.  

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