AK5322048 - Accutek Microcircuit Corporation

DESCRIPTION

The Accutek AK532256W high density memory module is a CMOS

dynamic RAM organized in 256K x 32 bit words. The module con-

sists of eight standard 256K x 4 DRAMs in plastic SOJ packages.

The assembly has eight drams mounted on the front side of a

printed circuit board in a 72 pad leadless SIM configuration.

The operation of the AK532256W is identical to eight 256K x 4

DRAMs. There are four CAS lines and two RAS lines. Independent

byte control is accomplished by four CAS lines. Each seperate CAS

line controls two 256K x 4 Drams to form an 8 bit byte. The bank of

32 bits is controlled by the two RAS lines. A sixteen bit data path can

be produced by connecting DQ1to DQ17,DQ

2to DQ18 and alter-

nately strobing RAS0with RAS2.

FEATURES

·262,144 x 32 bit organization

·72 pin Single In-Line Module

·Multiple CAS and RAS lines allow x16 or x32 bit widths

·CAS-before-RAS Refresh, RAS-only Refresh or Hidden refresh

·Operating free air temperature 0oCto70

·Single 5 Volt Power Supply

·512 Refresh Cycles, 8mSEC

·Power

2.00 Watt Max Active (60nS)

1.78 Watt Max Active (70 nS)

1.562 Watt Max Active (80 nS)

44 mW Max Standby

·Available in Fast Page Mode, EDO and Static Column Mode

versions

·Available in leadless SIM or leaded Zip versions

·Upward compatible with AK532512, AK5321024, AK5322048,

AK5324096 and AK5328192

ADDITIONAL OPTIONS AVAILABLE

·512K x 32 version, AK532512

·1 Meg x 32 version, AK5321024

·2 Meg x 32 version, AK5322048

·4 Meg x 32 version, AK5324096

·8 Meg x 32 version, AK5328192

Accutek

Microcircuit

Corporation

AK532256W

262,144 Word by 32 Bit CMOS

Dynamic Random Access Memory

PIN NOMENCLATURE

A0-A

8Address Inputs

DQ1-DQ

32 Data In/Data Out

CAS0- CAS3Column Address Strobe

RAS0, RAS2Row Address Strobe

WE Write Enable

PD1-PD

4Presence Detect

Vcc 5v Supply

Vss Ground

NC No Connect

MODULE OPTIONS

Leadless SIM: AK532256W

Leaded ZIP: AK532256WZ

PIN ASSIGNMENT

PIN # SYMBOL PIN # SYMBOL PIN # SYMBOL PIN # SYMBOL

1 Vss 19 NC 37 NC 55 DQ12

2 D1 20 DQ5 38 NC 56 DQ28

3 DQ17 21 DQ21 39 Vss 57 DQ13

4 DQ2 22 DQ6 40 CAS0 58 DQ29

5 DQ18 23 DQ22 41 CAS2 59 Vcc

6 DQ3 24 DQ7 42 CAS3 60 DQ30

7 DQ19 25 DQ23 43 CAS1 61 DQ14

8 DQ4 26 DQ8 44 RAS0 62 DQ31

9 DQ20 27 DQ24 45 NC 63 DQ15

10 Vcc 28 A7 46 NC 64 DQ32

11 NC 29 NC 47 WE 65 DQ16

12 A0 30 Vcc 48 NC 66 NC

13 A1 31 A8 49 DQ9 67 PD1

14 A2 32 NC 50 DQ25 68 PD2

15 A3 33 NC 51 DQ10 69 PD3

16 A4 34 RAS2 52 DQ26 70 PD4

17 A5 35 NC 53 DQ11 71 NC

18 A6 36 NC 54 DQ27 72 Vss

Presence Detect -

-60 -70 -80

PD1 Vss Vss Vss

PD2 NC NC NC

PD3 NC Vss NC

PD4 NC NC Vss

FUNCTIONAL DIAGRAM

MECHANICAL DIMENSIONS

ACCUTEK MICROCIRCUIT CORPORATION

BUSINESS CENTER at NEWBURYPORT

2 NEW PASTURE ROAD, SUITE 1

NEWBURYPORT, MA 01950-4054

PHONE: 978-465-6200 FAX: 978-462-3396

Email: sales@accutekmicro.com

Internet: www.accutekmicro.com

Accutek reserves the right to make changes in specifications at any time

and without notice. Accutek does not assume any responsibility for the

use of any circuitry described; no circuit patent licenses are implied. Pre-

liminary data sheets contain minimum and maximum limits based upon

design objectives, which are subject to change upon full characterization

over the specific operating conditions.

1.000"

MAX

0.200"

MAX

0.425"

0.375" 0.250"

0.080" 0.125" 0.050"

TYP

4.250"

3.985"

A0 - A8 9

RAS0

DQ0 - DQ4

DQ4 - DQ7

DQ8 - DQ11

DQ12 - DQ15

DQ16 - DQ19

DQ20 - DQ23

DQ24 - DQ27

DQ28 - DQ31

A0 - A8

CAS

RAS

DQ0 - DQ3

RAS2

CAS1

CAS0

CAS2

CAS3