Datasheet > DP8418

DP8418

更新时间： 2024-02-20 09:40:03

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
28页	525K
描述
64k, 256k Dynamic RAM Controller/Drivers

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中文翻译

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数据手册

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DP8418 数据手册

PRELIMINARY

August 1989

DP8417/NS32817, 8418/32818, 8419/32819, 8419X/

32819X 64k, 256k Dynamic RAM Controller/Drivers

General Description

Operational Features

Makes DRAM Interface and refresh tasks appear virtu-

ally transparent to the CPU, making DRAMs as easy to

use as static RAMs

The DP8417/8418/8419/8419X represent a family of 256k

DRAM Controller/Drivers which are designed to provide

‘‘No-Waitstate’’ CPU interface to Dynamic RAM arrays of up

to 2 Mbytes and larger. Each device offers slight functional

variations of the DP8419 design which are tailored for differ-

ent system requirements. All family members are fabricated

using National’s new oxide isolated Advanced Low power

Schottky (ALS) process and use design techniques which

enable them to significantly out-perform all other LSI or dis-

crete alternatives in speed, level of integration, and power

consumption.

Specifically designed to eliminate CPU wait states up to

10 MHz or beyond

Eliminates 15 to 20 SSI/MSI components for significant

board real estate reduction, system power savings and

the elimination of chip-to-chip AC skewing

On-board ultra precise delay line

On-board high capacitive RAS, CAS, WE, and address

drivers (specified driving 88 DRAMs directly)

Each device integrates the following critical 256k DRAM

controller functions on a single monolithic device: ultra pre-

cise delay line; 9-bit refresh counter; fall-through row, col-

umn, and bank select input latches; Row/Column address

muxing logic; on-board high capacitive-load RAS, CAS, and

Write Enable & Address output drivers; and, precise control

signal timing for all the above.

AC specified for directly addressing up to 8 Megabytes

Low power/high speed bipolar oxide isolated process

Upward pin and function compatible with new DP8428/

DP8429 1 Mbit DRAM controller drivers

Downward pin and function compatible with DP8408A/

DP8409A 64k/256k DRAM controller/drivers

4 user selectable modes of operation for Access and

Refresh (2 automatic, 2 external)

There are four device options of the basic DP8419 Control-

ler. The DP8417 is pin and function compatible with the

DP8419 except that its outputs are TRI-STATE

. The

Contents

DP8418 changes one pin and is specifically designed to

offer an optimum interface to 32 bit microprocessors. The

DP8419X is functionally identical to the DP8419, but is avail-

able in a 52-pin DIP package which is upward pin compati-

ble with National’s new DP8429D 1 Mbit DRAM Controller/

Driver.

System and Device Block Diagrams

Recommended Companion Components

Device Connection Diagrams and Pin Definitions

Family Device Differences

(DP8419 vs DP8409A, 8417, 8418, 8419X)

Each device is available in plastic DIP, Ceramic DIP, and

Plastic Chip Carrier (PCC) packaging. (Continued)

Mode of Operation

(Descriptions and Timing Diagrams)

Application Description and Diagrams

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

PALÉ is a registered trademark of and used under license with Monolithic Memories, Inc.

DC/AC Electrical Specifications, Timing Diagrams and

Test Conditions

System Diagram

TL/F/8396–25

1995 National Semiconductor Corporation

TL/F/8396

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

12 3 4 5 6 7...28

中文翻译

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与DP8418相关器件

型号	品牌	获取价格	描述	数据表
DP8418D-70	NSC	获取价格	64k, 256k Dynamic RAM Controller/Drivers
DP8418D-80	NSC	获取价格	64k, 256k Dynamic RAM Controller/Drivers
DP8418N-70	NSC	获取价格	64k, 256k Dynamic RAM Controller/Drivers
DP8418N-80	NSC	获取价格	64k, 256k Dynamic RAM Controller/Drivers
DP8418V-70	NSC	获取价格	64k, 256k Dynamic RAM Controller/Drivers
DP8418V-70X	NSC	获取价格	256KX1, DRAM CONTROLLER, PQCC64, PLASTIC, CC-68
DP8418V-80	NSC	获取价格	64k, 256k Dynamic RAM Controller/Drivers
DP8418V-80X	NSC	获取价格	256KX1, DRAM CONTROLLER, PQCC64, PLASTIC, CC-68
DP8419D	ETC	获取价格	DRAM Controller
DP8419D-70	NSC	获取价格	64k, 256k Dynamic RAM Controller/Drivers

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