AS4DDR232M72APBG Datasheet, PDF (1/28 Pages) Micross Components – 4-bit prefetch architecture

iPEM
2.4 Gb SDRAM-DDR2
AS4DDR232M72APBG
32Mx72 DDR2 SDRAM
iNTEGRATED Plastic Encapsulated Microcircuit
FEATURES
 DDR2 Data rate = 667, 533, 400
 Available in Industrial, Enhanced and Military Temp
 Package:
• 255 Plastic Ball Grid Array (PBGA), 25 x 32mm
• 1.27mm pitch
 Differential data strobe (DQS, DQS#) per byte
 Internal, pipelined, double data rate architecture
 4-bit prefetch architecture
 DLL for alignment of DQ and DQS transitions with
clock signal
 Four internal banks for concurrent operation
(Per DDR2 SDRAM Die)
 Programmable Burst lengths: 4 or 8
 Auto Refresh and Self Refresh Modes
 On Die Termination (ODT)
 Adjustable data – output drive strength
 1.8V ±0.1V power supply and I/O (VCC/VCCQ)
 Programmable CAS latency: 3, 4, 5, or 6
 Posted CAS additive latency: 0, 1, 2, 3 or 4
 Write latency = Read latency - 1* tCK
 Organized as 32M x 72 w/ support for x80
 Weight: AS4DDR232M72APBG ~ 3.5 grams typical
NOTE: Self Refresh Mode available on Industrial and Enhanced temp. only
BENEFITS
 SPACE conscious PBGA defined for easy
SMT manufacturability (50 mil ball pitch)
 Reduced part count
 47% I/O reduction vs Individual CSP approach
 Reduced trace lengths for lower parasitic
capacitance
 Suitable for hi-reliability applications
 Upgradable to 64M x 72 density
(consult factory for info on
AS4DDR264M72PBG)
Configuration Addressing
Parameter
Configuration
Refresh Count
Row Address
Bank Address
Column Address
32 Meg x 72
8 Meg x 16 x 4 Banks
8K
8K (A0‐A12)
4 (BA0‐BA1)
1K (A0‐A9)
FUNCTIONAL BLOCK DIAGRAM
Ax, BA0-1
ODT
VRef
VCC
VCCQ
VSS
VSSQ
VCCL
VSSDL
CS0\
CS1\
CS2\
CS3\
CS4\
UDMx, LDMx
UDSQx,UDSQx\
LDSQx, LDSQx\
RASx\,CASx\,WEx\
CKx,CKx\,CKEx
A
2
2
2
3
3
VCCL
VSSDL
A
2
2
2
3
3
DQ0-15 B
VCCL
VSSDL
B
2
2
2
3
3
DQ16-31 C
VCCL
VSSDL
C
2
2
2
3
3
DQ32-47 D
VCCL
VSSDL
D
2
2
2
3
3
DQ64-79
DQ48-63
AS4DDR232M72APBG
Rev. 1.1 12/12
Micross Components reserves the right to change products or specifications without notice.
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