Datasheet > DP8440-40

DP8440-40

更新时间： 2024-02-05 14:15:40

品牌	Logo	应用领域
美国国家半导体 - NSC		驱动器内存控制器
页数	文件大小	规格书
46页	643K
描述
microCMOS Programmable 16/64 Mbit Dynamic RAM Controller/Driver

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DP8440-40 数据手册

February 1995

DP8440-40/DP8440-25/DP8441-40/DP8441-25

microCMOS Programmable 16/64 Mbit

Dynamic RAM Controller/Driver

General Description

Features

40 MHz and 25 MHz operation

The DP8440/41 Dynamic RAM Controllers provide an easy

interface between dynamic RAM arrays and 8-, 16-, 32- and

64-bit microprocessors. The DP8440/41 DRAM Controllers

generate all necessary control and timing signals to suc-

cessfully interface and design dynamic memory systems.

With significant enhancements over the DP8420/21/22

predecessors, the DP8440/41 are suitable for high perform-

ance memory systems. These controllers support page and

burst accesses for fast page, static column and nibble

DRAMs. Refreshes and accesses are arbitrated on chip.

RAS low time during refresh and RAS precharge time are

guaranteed by these controllers. Separate precharge coun-

ters for each RAS output avoid delayed back to back ac-

cesses due to precharge when using memory interleaving.

Programmable features make the DP8440/41 DRAM Con-

trollers flexible enough to fit many memory systems.

Page detection

Automatic CPU burst accesses

Support 1/4/16/64 Mbits DRAMs

High capacitance drivers for RAS, CAS, WE and Q out-

puts

Support for fast page, static column and nibble mode

DRAMs

High precision PLL based delay line

Byte enable for word size up to 32 bits on the DP8440

or 64 bits on the DP8441

Automatic Internal Refresh

Staggered RAS-Only refresh

Burst and CAS-before-RAS refresh

Error scrubbing during refresh

TRI-STATE outputs

Easy interface to all major microprocessors

Block Diagram

TL/F/11718–1

FIGURE 1

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

1995 National Semiconductor Corporation

TL/F/11718

RRD-B30M75/Printed in U. S. A.

12 3 4 5 6 7...46

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与DP8440-40相关器件

型号	品牌	获取价格	描述	数据表
DP8440V	ETC	获取价格	DRAM Controller
DP8440V-40	NSC	获取价格	microCMOS Programmable 16/64 Mbit Dynamic RAM Controller/Driver
DP8440VLJ-25	NSC	获取价格	microCMOS Programmable 16/64 Mbit Dynamic RAM Controller/Driver
DP8440VLJ-40	NSC	获取价格	microCMOS Programmable 16/64 Mbit Dynamic RAM Controller/Driver
DP8441	ETC	获取价格
DP84412J	ETC	获取价格	DRAM Controller
DP84412J/A+	ETC	获取价格	DRAM Controller
DP84412N	ETC	获取价格	DRAM Controller
DP84412N/A+	ETC	获取价格	DRAM Controller
DP84412N/B+	ETC	获取价格	DRAM Controller