TM893CBK32, TM893CBK32S

8388608 BY 32-BIT

DYNAMIC RAM MODULE

SMMS652A – FEBRUARY 1995 – REVISED JUNE 1995

1

POST OFFICE BOX 1443

TM893CBK32 ...8 388 608

× 32 Bit

Module ( SIMM ) for Use With Sockets

Dynamic RAMs in Plastic Small-Outline

J-Lead ( SOJ ) Packages

32 ms (2048 Cycles)

Compatible

Data-In and Data-Out Lines in Four Blocks

CAS-Before-RAS ( CBR ), RAS-Only, and

Hidden Refresh

ACCESS

ACCESS ACCESS READ

TIME

TIME

TIME

OR

tRAC

tAA

tCAC

WRITE

CYCLE

(MAX)

(MAX)

(MAX)

(MIN)

’893CBK32-60

60 ns

30 ns

15 ns

110 ns

’893CBK32-70

70 ns

35 ns

18 ns

130 ns

’893CBK32-80

80 ns

40 ns

20 ns

150 ns

0

°C to 70°C

TM893CBK32

Available:

TM893CBK32S

description

The TM893CBK32 is a 32-megabyte, dynamic random-access memory organized as four times 8 388 608

× 8

bits in a 72-pin, leadless single in-line memory module ( SIMM ). The SIMM is composed of 16 TMS417400DJ,

4 194 304

× 4-bit dynamic RAMs, each in 24/26-lead plastic small-outline J-lead (SOJ) packages mounted on

a substrate with decoupling capacitors. The TMS417400DJ is described in the TMS417400 data sheet. The

TM893CBK32 SIMM is available in the double-sided BK leadless module for use with sockets.

operation

The TM893CBK32 operates as sixteen TMS417400DJs connected as shown in the functional block diagram

and Table 1. The common I / O feature dictates the use of early-write cycles to prevent contention on D and Q.

refresh

The refresh period is extended to 32 ms, and during this period each of the 2048 rows must be strobed with RAS

to retain data. To conserve power, CAS can remain high during the refresh sequence.

power up

To achieve proper operation, an initial pause of 200

µs followed by a minimum of eight initialization cycles is

( RAS-only or CBR ) cycle.

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.

Copyright

© 1995, Texas Instruments Incorporated

† Part numbers in this data sheet are for the gold-tabbed version; the information applies to both gold-tabbed and solder-tabbed versions.