Datasheet > AK59256ASW-70

AK59256ASW-70

更新时间： 2024-09-19 03:04:19

品牌	Logo	应用领域
ACCUTEK		动态存储器
页数	文件大小	规格书
2页	90K
描述
DRAM

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中文翻译

获取价格

数据手册

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AK59256ASW-70 数据手册

Accutek

Microcircuit

Corporation

AK59256AS / AK59256AG

262,144 Word by 9 bit, CMOS

Dynamic Random Access Memory

DESCRIPTION

Front View

30-Pin SIM

The Accutek AK59256A high density memory modules is a random

access memory organized in 256K x 9 bit words. The assembly

consists of two 256K x 4 and one 256K x 1 DRAMs in surface mount

packages mounted to the front side of a printed circuit board. The

module can be configured as a leadless 30 pad SIM or a leaded 30

pin SIP. This packaging approach provides a better than 6 to 1 den-

sity increase over standard DIP packaging.

30-Pin SIP

The operation of the AK59256A is identical to two 256K x 4 DRAMs

plus one 256K x 1 DRAM. For the lower eight bits data input is tied

to data output and brought out separately for each 256K x 4 device,

with common RAS, CAS and WE control. The OE pins are tied to

Vss which dictates the use of early-write cycles to prevent conten-

tion of D and Q. Since the Write-Enable (WE) signal must always go

low before CAS in a write cycle, Read-Write and Read-Modify-Write

operation is not possible. For the ninth bit, the data input (D₉₎and

data output (Q₉) pins are brought out separately and controlled by a

separate PCAS for that bit. Bit nine is generally used for parity.

· Power:

FEATURES

1.26 Watt Max Active (70 nSEC)

1.10 Watt Max Active (80 nSEC)

.935 Wat Max Active (100 nSEC)

22 mWatt Standby (Max)

· 262,144 x 9 bit organization

· Optional 30 Pad SIM (Single In-Line Module) or 30 Pin leaded

SIP (Single In-Line Package)

· Operating free air temperature: 0^oto 70^oC

· JEDEC standard pinout

· Upward compatible with AK491024, AK591024, AK594096

and AK5916384

· Common CAS, RAS and WE control for the lower eight bits

· Separate PCAS control for D₉and Q₉

· Functionally and Pin compatible with AK49256

· Available with access times of 60 nSEC to 100 nSEC

PIN NOMENCLATURE

PIN ASSIGNMENT

FUNCTIONAL DIAGRAM

PIN #

SYMBOL

Vcc

CAS

DQ1

PIN #

SYMBOL

DQ5

DQ₁- DQ₈

D₉

Data In / Data Out

A0 - A8

RAS

CAS

DQ1

DQ2

DQ3

DQ4

RAS

CAS

Data In

Q₉

Data Out

DQ1 +

DQ2

DQ3

DQ4

A₀- A₉

CAS, PCAS

RAS

Address Inputs

Column Address Strobe

Row Address Strobe

Write Enable

5v Supply

DQ6

DQ2

Vss

DQ7

A0 - A8

RAS

CAS

DQ1

DQ2

DQ3

DQ4

Vss

DQ3

Vcc

DQ8

DQ5 +

DQ6

DQ7

DQ8

Vss

Ground

RAS

PCAS

No Connect

DQ4

A0 - A8

RAS

CAS

MODULE OPTIONS

Vcc

PCAS

Leadless SIM: AK59256AS

Leaded SIP: AK59256AG

中文翻译

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与AK59256ASW-70相关器件

型号	品牌	获取价格	描述	数据表
AK59256ASW-80	ACCUTEK	获取价格	DRAM
AK59256D	ACCUTEK	获取价格	262,144 X 8 Bit MOS Dynamic Random Access Memory
AK59256G	ACCUTEK	获取价格	262,144 X 8 Bit MOS Dynamic Random Access Memory
AK59256GK10	ACCUTEK	获取价格	DRAM
AK59256GK60	ACCUTEK	获取价格	DRAM
AK59256GKI10	ACCUTEK	获取价格	DRAM
AK59256GKI60	ACCUTEK	获取价格	DRAM
AK59256GKI70	ACCUTEK	获取价格	DRAM
AK59256GKIX10	ACCUTEK	获取价格	DRAM
AK59256GKIX60	ACCUTEK	获取价格	DRAM

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