FUJITSU SEMICONDUCTOR
DATA SHEET
DS05-11031-2E
MEMORY
CMOS
4 × 512 K × 32 BIT
SYNCHRONOUS DYNAMIC RAM
MB811643242A-100/-84/-67/-100L/-84L/-67L
CMOS 4-Bank × 524,288-Word × 32 Bit
Synchronous Dynamic Random Access Memory
s DESCRIPTION
The Fujitsu MB811643242A is a CMOS Synchronous Dynamic Random Access Memory (SDRAM) containing
67,108,864 memory cells accessible in a 32-bit format. The MB811643242A features a fully synchronous
operation referenced to a positive edge clock whereby all operations are synchronized at a clock input which
enables high performance and simple user interface coexistence. The MB811643242A SDRAM is designed to
reduce the complexity of using a standard dynamic RAM (DRAM) which requires many control signal timing
constraints, and may improve data bandwidth of memory as much as 5 times more than a standard DRAM.
The MB811643242A is ideally suited for workstations, personal computers, laser printers, high resolution graphic
adapters/accelerators and other applications where an extremely large memory and bandwidth are required and
where a simple interface is needed.
s PRODUCT LINE & FEATURES
Parameter
Clock Frequency
Burst Mode Cycle Time
RAS Access Time
CAS Access Time
Access Time From Clock (CL = 3)
Operating Current (2 banks active)
Power Down Mode Current (ICC2P)
Self Refresh Current (ICC6)
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MB811643242A
-100/-100L
-84/-84L
-67/-67L
100 MHz max.
84 MHz max.
67 MHz max.
10 ns min.
12 ns min.
15 ns min.
54 ns max.
56 ns max.
60 ns max.
24 ns max.
26 ns max.
30 ns max.
8.5 ns max.
8.5 ns max.
9 ns max.
245 mA max.
230 mA max.
197 mA max.
3 mA max.(Std Power) , 1.2 mA max.(Low Power)
2 mA max.(Std Power) , 500µA max.(Low Power)
Single +3.3 V Supply ±0.3 V tolerance
LVTTL compatible I/O
4 K refresh cycles every 65.6 ms
Four bank operation
Byte control by DQM0 to DQM3
Burst read/write operation and burst
read/single write operation capability
• Programmable burst type, burst length, and
CAS latency
• Auto-(every 16 µs)and Self-refresh
• CKE power down mode
• Output Enable and Input Data Mask
• Standard and Low Power versions
