168-pin Low Profile Registered SDRAM DIMMs
256MB, 512MB, 1GB
Preliminary Data Sheet
256MB ECC DIMM Functional Block Diagram – SM25609ARDT4
RS0#
Clock Wiring
RDQMB0
RDQMB4
CK0
PLL
CK1
CK2
CK3
Terminated
Terminated
Terminated
DQ(3:0)
U0
U1
U2
U3
U4
DQ(35:32)
U9
10
CK1-3
12pf
DQ(7:4)
DQ(39:36)
RDQMB5
DQ(45:40)
U10
U11
U12
U13
SDRAM x 3
SDRAM x 3
SDRAM x 3
SDRAM x 3
SDRAM x 3
SDRAM x 3
Register x 2
RDQMB1
10
DQ(11:8)
DQ(15:12)
CB(3:0)
CK0
PLL
12pf
DQ(47:44)
SCL
SDA
Serial PD
SA0-2
WP
47K
CB(7:4)
RDQMB6
DQ(51:48)
RS2#
RDQMB2
Vdd
Vss
Vdd SDRAM U0-17
Vss SDRAM U0-17
DQ(19:16)
U5
U14
RAS#
RRAS#
RCAS#
CAS#
CKE0
R
RCKE0
RWE#
E
G
I
DQ(23:20)
RDQMB3
U6
U7
U8
DQ(55:52)
RDQMB7
DQ(59:56)
U15
U16
U17
WE#
S
T
E
R
A0-12
RA0-11
RBA0-1
RS0,2#
BA0-1
DQ(27:24)
S0,2#
DQMB0-7
RDQMB0-7
PLL CLK
DQ(31:28)
DQ(63:60)
10K
VDD
REGE
Note:
All DQ resistor values are 10 ohms.
All CK resistor values are 10 ohms.
U0-U17 are 32Mx4 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 4
Revision 1.1
RAMTRON [ RAMTRON INTERNATIONAL CORPORATION ]
