TM2SN64EPN 2097152 BY 64-BIT
TM4SN64EPN 4194304 BY 64-BIT
SYNCHRONOUS DYNAMIC RAM MODULES
SMMS696 AUGUST 1997
1
POST OFFICE BOX 1443
HOUSTON, TEXAS 772511443
D
Organization:
TM2SN64EPN . . . 2 097 152 x 64 Bits
TM4SN64EPN . . . 4 194 304 x 64 Bits
D
Single 3.3-V Power Supply
(
10% Tolerance)
D
Designed for 66-MHz 4-Clock Systems
D
JEDEC 168-Pin Dual-In-Line Memory
Module (DIMM) Without Buffer for Use With
Socket
D
TM2SN64EPN -- Uses Eight 16M-Bit
Synchronous Dynamic RAMs (SDRAMs)
(2M
8-Bit) in Plastic Thin Small-Outline
Packages (TSOPs)
D
TM4SN64EPN -- Uses Sixteen 16M-Bit
SDRAMs (2M
8-Bit) in Plastic TSOPs
D
Byte-Read/Write Capability
D
Performance Ranges:
D
High-Speed, Low-Noise Low-Voltage TTL
(LVTTL) Interface
D
Read Latencies 2 and 3 Supported
D
Support Burst-Interleave and
Burst-Interrupt Operations
D
Burst Length Programmable to 1, 2, 4,
and 8
D
Two Banks for On-Chip Interleaving
(Gapless Access)
D
Ambient Temperature Range
0
C to 70
C
D
Gold-Plated Contacts
D
Pipeline Architecture
D
Serial Presence-Detect (SPD) Using
EEPROM
SYNCHRONOUS
CLOCK CYCLE
TIME
ACCESS TIME
CLOCK TO
OUTPUT
REFRESH
INTERVAL
tCK3
(CL = 3)
tCK2
(CL = 2)
tCK3
(CL = 3)
tCK2
(CL = 2)
'xSN64EPN-10
10 ns
15 ns
7.5 ns
8 ns
64 ms
'xSN64EPN-12
12 ns
15 ns
8 ns
9 ns
64 ms
CL = CAS latency
description
The TM2SN64EPN is a 16M-byte, 168-pin dual-in-line memory module (DIMM). The DIMM is composed of
eight TMS626812ADGE, 2 097 152 x 8-bit SDRAMs, each in a 400-mil, 44-pin plastic thin small-outline package
(TSOP) mounted on a substrate with decoupling capacitors. See the TMS626812A data sheet (literature
number SMOS691).
The TM4SN64EPN is a 32M-byte, 168-pin DIMM. The DIMM is composed of sixteen TMS626812ADGE,
2 097 152 x 8-bit SDRAMs, each in a 400-mil, 44-pin plastic TSOP mounted on a substrate with decoupling
capacitors. See the TMS626812A data sheet (literature number SMOS691).
operation
The TM2SN64EPN operates as eight TMS626812ADGE devices that are connected as shown in the
TM2SN64EPN functional block diagram. The TM4SN64EPN operates as sixteen TMS626812ADGE devices
connected as shown in the TM4SN64EPN 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.
PRODUCT PREVIEW
Copyright
1997, Texas Instruments Incorporated
PRODUCT PREVIEW information concerns products in the formative or
design phase of development. Characteristic data and other
specifications are design goals. Texas Instruments reserves the right to
change or discontinue these products without notice.
TM2SN64EPN 2097152 BY 64-BIT
TM4SN64EPN 4194304 BY 64-BIT
SYNCHRONOUS DYNAMIC RAM MODULES
SMMS696 AUGUST 1997
4
POST OFFICE BOX 1443
HOUSTON, TEXAS 772511443
dual-in-line memory module and components
The dual-in-line memory module and components include:
D
PC substrate: 1,27
0,1 mm (0.05 inch) nominal thickness; 0.005 inch/inch maximum warpage
D
Bypass capacitors: Multilayer ceramic
D
Contact area: Nickel plate and gold plate over copper
functional block diagram for the TM2SN64EPN
8
DQ[0:7]
8
CS
U0
CS
U4
R
R
S0
DQMB0
DQ[0:7]
DQMB4
DQ[32:39]
DQM
DQ[0:7]
DQM
RAS
RAS: SDRAM U[0:7]
CK0
CK: U1, U5
CK2
C
SPD EEPROM
SA0
SA1
SA2
A0
A1
A2
SCL
SDA
8
DQ[0:7]
8
CS
U1
CS
U5
R
R
DQMB1
DQ[8:15]
DQMB5
DQ[40:47]
DQM
DQ[0:7]
DQM
R = 10
RC = 10
C = 10 pF
8
DQ[0:7]
8
CS
U2
CS
U6
R
R
S2
DQMB2
DQ[16:23]
DQMB6
DQ[48:55]
DQM
DQ[0:7]
DQM
8
DQ[0:7]
8
CS
U3
CS
U7
R
R
DQMB3
DQ[24:31]
DQMB7
DQ[56:63]
DQM
DQ[0:7]
DQM
CAS
CAS: SDRAM U[0:7]
WE
WE: SDRAM U[0:7]
CKE0
CKE: SDRAM U[0:7]
A[0:11]
A[0:11]: SDRAM U[0:7]
RC
RC
RC
VDD
VSS
Two 0.1
F
(minimum) per
SDRAM
U[0:7]
U[0:7]
CK1
CK: U2, U6
CK: U3, U7
CK3
C
RC
RC
RC
CK: U0, U4
LEGEND: CS
=
Chip select
SPD =
Serial Presence Detect
PRODUCT PREVIEW
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