TM4EP72BPB, TM4EP72BJB, 4194304 BY 72BIT

TM4EP72CPB, TM4EP72CJB 4194304 BY 72BIT

EXTENDEDDATAOUT BUFFERED DYNAMIC RAM MODULES

SMMS686A − AUGUST 1997 − REVISED FEBRUARY 1998

1

POST OFFICE BOX 1443

(

±10% Tolerance)

Module (DIMM) With Buffer for Use With

Socket

High-Speed (4M

×4-Bit) Dynamic Random

Access Memories (DRAMs)

300-Mil-Wide Surface-Mount Small-Outline

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

26-Lead 300-Mil-Wide Surface-Mount Thin

Small-Outline Package (TSOP) (DGA Suffix)

Applications

− TM4EP72CxB: 64 ms (4 096 Cycles)

− TM4EP72BxB: 32 ms (2 048 Cycles)

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

Hidden Refresh

0

°C to 70°C

ACCESS

ACCESS ACCESS

EDO

TIME

TIME

TIME

CYCLE

tRAC

tCAC

tAA

tHPC

(MAX)

(MAX)

(MAX)

(MIN)

’4EP72xxB-50

50 ns

13 ns

25 ns

20 ns

’4EP72xxB-60

60 ns

15 ns

30 ns

25 ns

’4EP72xxB-70

70 ns

18 ns

35 ns

30 ns

description

The TM4EP72BxB is a 32M-byte, 168-pin, buffered, dual-in-line memory module (DIMM). The DIMM is

composed of eighteen TMS427409A, 4 194 304

× 4-bit 2K refresh EDO DRAMs, each in a 300-mil, 26-lead

plastic TSOP (DGA suffix) or SOJ package (DJ suffix), and two SN74LVT162244 16-bit buffers, each in a

48-lead plastic TSOP mounted on a substrate with decoupling capacitors. See the TMS427409A data sheet

(literature number SMKS893).

The TM4EP72CxB is a 32M-byte, 168-pin, buffered DIMM. The DIMM is composed of eighteen TMS426409A,

4 194 304

× 4-bit 4K refresh EDO DRAMs, each in a 300-mil, 26-lead plastic TSOP (DGA suffix) or SOJ package

(DJ suffix), and two 16-bit buffers mounted on a substrate with decoupling capacitors. See the TMS427409A

data sheet (literature number SMKS893).

These modules are intended for multimodule workstation / server applications where buffering is needed for

address and control signals. Two copies of address 0 (A0 and B0) are defined to allow maximum performance

for 4-byte applications which interleave between two 4-byte banks. A0 is common to the DRAMs used for

DQ0−DQ31, while B0 is common to the DRAMs used for DQ32−DQ63.

operation

The TM4EP72xxB operates as eighteen TMS42x409As that are connected as shown in the TM4EP72xxB

functional block diagram.

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.

Copyright

 1998, 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.