The TMS41x409A and TMS42x409A series are

16 777 216-bit dynamic random-access memory

(DRAM) devices organized as 4 194 304 words of

four bits each.

These devices feature maximum RAS access

times of 50, 60, and 70 ns. All address and data-in

lines are latched on chip to simplify system

design. Data out is unlatched to allow greater

system flexibility.

description

TMS416409A, TMS417409A, TMS426409A, TMS427409A

4194304 BY 4-BIT EXTENDED DATA OUT

DYNAMIC RANDOM-ACCESS MEMORIES

SMKS893B – AUGUST 1996 – REVISED APRIL 1997

1

POST OFFICE BOX 1443

This

data

sheet

is

applicable

to

all

TMS41x409As and TMS42x409As symbolized

by Revision “B”, Revision “E”, and subsequent

revisions

as

described

in

the

device

symbolization section.

ACCESS ACCESS ACCESS

EDO

TIME

TIME

TIME

CYCLE

tRAC

tCAC

tAA

tHPC

MAX

MAX

MAX

MIN

’41x409A-50

50 ns

13 ns

25 ns

20 ns

’41x409A-60

60 ns

15 ns

30 ns

25 ns

’41x409A-70

70 ns

18 ns

35 ns

30 ns

’42x409A-50

50 ns

13 ns

25 ns

20 ns

’42x409A-60

60 ns

15 ns

30 ns

25 ns

’42x409A-70

70 ns

18 ns

35 ns

30 ns

300-Mil-Wide Surface-Mount Small-Outline

J-Lead (SOJ) Package (DJ Suffix) and

24/26-Lead 300-Mil-Wide Surface-Mount

Thin Small-Outline Package (TSOP)

(DGA Suffix)

0

°C to 70°C

AVAILABLE OPTIONS

DEVICE

POWER

SUPPLY

SELF

REFRESH,

BATTERY

BACKUP

REFRESH

CYCLES

TMS416409A

5 V

–

4 096 in 64 ms

TMS417409A

5 V

–

2 048 in 32 ms

TMS426409A

3.3 V

–

4 096 in 64 ms

TMS427409A

3.3 V

–

2 048 in 32 ms

The TMS416409A and TMS417409A are offered in a 24 / 26-lead plastic surface-mount SOJ package

(DJ suffix). The TMS426409A and TMS427409A are offered in a 24/26-lead plastic surface-mount SOJ

package (DJ suffix) and a 24 / 26-lead plastic surface-mount TSOP (DGA suffix). These packages are designed

for operation from 0

°C to 70°C.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PIN NOMENCLATURE

A0 – A11†

Address Inputs

DQ1 – DQ4

Data In / Data Out

CAS

Column-Address Strobe

NC

No Internal Connection

OE

Output Enable

RAS

Row-Address Strobe

VCC

5-V or 3.3-V Supply‡

VSS

Ground

W

Write Enable

† A11 is NC for TMS417409A and TMS427409A.

‡ See Available Options Table

DJ/DGA PACKAGES

( TOP VIEW )

DQ1

DQ2

W

RAS

A0

A1

A2

A3

DQ4

DQ3

CAS

OE

A7

A6

A5

A4

26

25

24

23

22

18

17

16

15

14

1

2

3

4

5

9

10

11

12

13

A9

21

6

A10

A8

19

8

Copyright

© 1997, Texas Instruments Incorporated

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.