DP8402AD

更新时间： 2024-02-09 19:08:29

品牌	Logo	应用领域
美国国家半导体 - NSC		/
页数	文件大小	规格书
18页	320K
描述
DP8402A/DP8403/DP8404/DP8405 32-Bit Parallel Error Detection and Correction Circuits (EDACs)

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技术参数
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DP8402AD 技术参数

生命周期：	Obsolete	零件包装代码：	LCC
包装说明：	PLASTIC, LCC-68	针数：	68
Reach Compliance Code：	unknown	HTS代码：	8542.39.00.01
风险等级：	5.84	Is Samacsys：	N
系列：	8402	JESD-30 代码：	S-PQCC-J68
长度：	24.13 mm	逻辑集成电路类型：	ERROR DETECTION AND CORRECTION CIRCUIT
位数：	32	功能数量：	1
端子数量：	68	最高工作温度：	70 °C
最低工作温度：		输出特性：	3-STATE
封装主体材料：	PLASTIC/EPOXY	封装代码：	QCCJ
封装形状：	SQUARE	封装形式：	CHIP CARRIER
传播延迟（tpd）：	55 ns	座面最大高度：	4.57 mm
最大供电电压 (Vsup)：	5.5 V	最小供电电压 (Vsup)：	4.5 V
标称供电电压 (Vsup)：	5 V	表面贴装：	YES
温度等级：	COMMERCIAL	端子形式：	J BEND
端子节距：	1.27 mm	端子位置：	QUAD
宽度：	24.13 mm	Base Number Matches：	1

DP8402AD 数据手册

PRELIMINARY

August 1989

DP8402A/DP8403/DP8404/DP8405 32-Bit Parallel

Error Detection and Correction Circuits (EDAC’s)

General Description

The DP8402A, DP8403, DP8404 and DP8405 devices are

32-bit parallel error detection and correction circuits

(EDACs) in 52-pin DP8402A and DP8403 or 48-pin DP8404

and DP8405 600-mil packages. The EDACs use a modified

Hamming code to generate a 7-bit check word from a 32-bit

data word. This check word is stored along with the data

word during the memory write cycle. During the memory

read cycle, the 39-bit words from memory are processed by

the EDACs to determine if errors have occurred in memory.

condition of all lows or all highs from memory will be detect-

ed. Otherwise, errors in three or more bits of the 39-bit word

are beyond the capabilities of these devices to detect.

Read-modify-write (byte-control) operations can be per-

formed with the DP8402A and DP8403 EDACs by using out-

put latch enable, LEDBO, and the individual OEB0 thru

OEB3 byte control pins.

Diagnostics are performed on the EDACs by controls and

internal paths that allow the user to read the contents of the

DB and CB input latches. These will determine if the failure

occurred in memory or in the EDAC.

Single-bit errors in the 32-bit data word are flagged and cor-

rected.

Single-bit errors in the 7-bit check word are flagged, and the

CPU sends the EDAC through the correction cycle even

though the 32-bit data word is not in error. The correction

cycle will simply pass along the original 32-bit data word in

this case and produce error syndrome bits to pinpoint the

error-generating location.

Features

Detects and corrects single-bit errors

Detects and flags double-bit errors

Built-in diagnostic capability

Fast write and read cycle processing times

Double bit errors are flagged but not corrected. These er-

rors may occur in any two bits of the 39-bit word from mem-

ory (two errors in the 32-bit data word, two errors in the 7-bit

check word, or one error in each word). The gross-error

Byte-write capability . . . DP8402A and DP8403

Fully pin and function compatible with TI’s

SN74ALS632A thru SN74ALS635 series

System Environment

TL/F/8535–1

TRI-STATEÉ is a registered trademark of National Semiconductor Corp.

1995 National Semiconductor Corporation

TL/F/8535

RRD-B30M105/Printed in U. S. A.

12 3 4 5 6 7...18

中文翻译

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与DP8402AD相关器件

型号	品牌	获取价格	描述	数据表
DP8402AV	NSC	获取价格	DP8402A/DP8403/DP8404/DP8405 32-Bit Parallel Error Detection and Correction Circuits (EDAC
DP8403	NSC	获取价格	DP8402A/DP8403/DP8404/DP8405 32-Bit Parallel Error Detection and Correction Circuits (EDAC
DP8403D	NSC	获取价格	DP8402A/DP8403/DP8404/DP8405 32-Bit Parallel Error Detection and Correction Circuits (EDAC
DP8404	NSC	获取价格	DP8402A/DP8403/DP8404/DP8405 32-Bit Parallel Error Detection and Correction Circuits (EDAC
DP8404D	NSC	获取价格	DP8402A/DP8403/DP8404/DP8405 32-Bit Parallel Error Detection and Correction Circuits (EDAC
DP8405	NSC	获取价格	DP8402A/DP8403/DP8404/DP8405 32-Bit Parallel Error Detection and Correction Circuits (EDAC
DP8405D	NSC	获取价格	DP8402A/DP8403/DP8404/DP8405 32-Bit Parallel Error Detection and Correction Circuits (EDAC
DP8406	NSC	获取价格	32-Bit Parallel Error Detection and Correction Circuit
DP8406D	TI	获取价格	84 SERIES, 32-BIT ERROR DETECT AND CORRECT CKT, CDIP52, SIDE BRAZED, CERAMIC, DIP-52
DP8406D(74F632DC)	NSC	获取价格	32-Bit Parallel Error Detection and Correction Circuit

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