Data Sheet
168-pin Low Profile SDRAM DIMMs
32MB, 64MB, 128MB, 256MB, 512MB
128MB ECC DIMM Functional Block Diagram – SM12809ALDT
S0#
Clock Wiring
DQMB0
U0
DQ(7:0)
DQ(39:32)
DQMB4
U5
CK0
CK1
CK2
CK3
5 SDRAM
Termination
4 SDRAM+3.3 pf
Termination
10
CK0,2
DQMB1
U1
DQ(15:8)
DQ(47:40)
Clock Termination
10
CK1,3
10 pf
U2
CB(7:0)
SCL
Serial PD
SA0-2
S2#
WP
47K
SDA
DQMB5
U6
SDRAMs
DQMB2
U3
DQ(23:16)
DQMB6
U7
DQ(55:48)
BA0
BA1
A0-A11
BA0 SDRAM U0-8
BA1 SDRAM U0-8
A0-A11 SDRAM U0-8
Vdd SDRAM U0-8
Vss SDRAM U0-8
DQMB3
U4
DQ(31:24)
DQMB7
U8
DQ(63:56)
Vdd
Vss
RAS#
CAS#
WE#
CKE0
RAS# SDRAM U0-8
CAS# SDRAM U0-8
WE# SDRAM U0-8
CKE SDRAM U0-8
Note:
All DQ resistor values are 10 ohms.
All CK resistor values are 10 ohms.
U0-U8 are 16Mx8 PC133 SDRAM Devices.
Enhanced Memory Systems Inc., 1850 Ramtron Dr., Colo Spgs, CO 80921
PHONE: (800) 545-DRAM; FAX: (719) 488-9095;
http://www.edram.com
2001 Enhanced Memory Systems. All rights reserved.
The information contained herein is subject to change without notice.
Page 7 of 20
Revision 1.1
RAMTRON [ RAMTRON INTERNATIONAL CORPORATION ]
