White Electronic Designs
4Mx64 SDRAM
FEATURES
53% Space Savings vs. Monolithic Solution
Reduced System Inductance and Capacitance
3.3V Operating Supply Voltage
Fully Synchronous to Positive Clock Edge
Clock Frequencies of 133, 125 and 100MH
Z
Burst Operation
Sequential or Interleaved
Burst Length = Programmable 1, 2, 4, 8 or Full
Page
Burst Read and Write
Multiple Burst Read and Single Write
Data Mask Control Per Byte
Auto and Self Refresh
Automatic and Controlled Precharge Commands
Suspend Mode and Power Down Mode
17mm x 23mm, 153 BGA
This product is subject to change without notice.
WED3DL644V
DESCRIPTION
The WED3DL644V is a 4Mx64 Synchronous DRAM
configured as 4x1Mx64. The SDRAM BGA is constructed
with four 4Mx16 SDRAM die mounted on a multi-layer
laminate substrate and packaged in a 153 lead, 17mm by
23mm, BGA.
The WED3DL644V is available in clock speeds of 133MH
Z
,
125MH
Z
and 100MH
Z
. The range of operating frequencies,
programmable burst lengths and programmable latencies
allow the same device to be useful for a variety of
high bandwidth, high performance memory system
applications.
The package and design provides performance
enhancements via a 50% reduction in capacitance vs.
four monolithic devices. The design includes internal ground
and power planes which reduces inductance on the ground
and power pins allowing for improved decoupling and a
reduction in system noise.
PINOUT (TOP VIEW)
A
B
C
D
E
F
G
H
J
K
L
M
N
P
R
T
U
1
DQ41
DQ40
DQ33
DQ32
NC
NC
CE2#
NC
NC
NC
CE1#
NC
NC
DQ30
DQ31
DQ22
DQ23
2
DQ43
DQ42
DQ35
DQ34
V
CCQ
CE3#
NC
CKE
NC
CE0#
V
CCQ
DQ28
DQ29
DQ20
DQ21
3
DQ45
DQ44
DQ37
DQ36
V
CCQ
V
SS
V
SS
CAS#
V
SS
V
SS
V
CCQ
DQ26
DQ27
DQ18
DQ19
4
DQ47
DQ46
DQ39
DQ38
V
CC
V
CC
V
SS
CK1
RAS#
CK0
V
SS
V
CC
V
CC
DQ24
DQ25
DQ16
DQ17
5
NC
NC
NC
NC
V
CC
V
CC
V
SS
V
SS
WE#
V
SS
V
SS
V
CC
V
CC
NC
NC
NC
NC
6
DQ48
DQ49
DQ56
DQ57
V
CC
V
CC
V
SS
V
SS
A9
V
SS
V
SS
V
CC
V
CC
DQ06
DQ07
DQ14
DQ15
7
DQ50
DQ51
DQ58
DQ59
V
CCQ
V
SS
V
SS
A11
V
SS
V
SS
V
CCQ
DQ04
DQ05
DQ12
DQ13
8
DQ52
DQ53
DQ60
DQ61
V
CCQ
A4
A5
A6
A7
A8
V
CCQ
DQ02
DQ03
DQ10
DQ11
9
DQ54
DQ55
DQ62
DQ63
NC
A3
A2
A1
A0
A10
BA1
BA0
NC
DQ00
DQ01
DQ08
DQ09
PIN DESCRIPTION
A0 – A11
BA0-1
DQ0-63
CK0-1
CKE
DQML0-3
DQMH0-3
RAS#
CAS#
WE#
CE0-3#
V
CC
V
CCQ
V
SS
Address Bus
Bank Select Addresses
Data Bus
Clock
Clock Enable
Data Input/Output Masks
Row Address Strobe
Column Address Strobe
Write Enable
Chip Enables
Power Supply pins, 3.3V
Data Bus Power Supply, 3.3V
Ground pins
DQML2 DQMH2
DQML3 DQMH3
DQMH1 DQML1
DQMH0 DQML0
August 2005
Rev. 6
1
White Electronic Designs Corporation • (602) 437-1520 • www.wedc.com
WEDC [ WHITE ELECTRONIC DESIGNS CORPORATION ]
