FIND, Vol. 17, No. 3, August 1999
NEW PRODUCTS
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MB81xx643242B
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Overview
Synchronous DRAMs (SDRAMs) have been rapidly
increasing in popularity since they were employed
as main memory for personal computers. They have
also been used not only for computer main memory,
but also for various other applications, including
communications equipment, consumer products,
multimedia, graphics, and mobile products. It is ex-
pected that the 64 M-bit SDRAM with a 32-bit I/O
configuration will be adopted as the preferred con-
figuration for many of these applications.
FUJITSU has now developed two series of SDRAM
with a 32-bit I/O configuration:
• The MB81F643242B is a high-performance
version, operating at a maximum frequency of
143 MHz. This SDRAM is the second-
generation product, based on the current
mass-production 2M x 32-bit SDRAM.
• The MB811L643242B is a low-voltage, low
power consumption version operating at 2.5V.
These products employ a new test technology, Stat-
ic Component Interconnection Test Technology
(SCITT), developed by a
FUJITSU/Philips (Nether-
lands) collaboration. SCITT
is a new XNOR circuit-
based technology that is
used for board-level inter-
connection testing. Using SCITT’s simple method
reduces the test time and cost required for board-
level interconnection testing.
Product Features
The MB81F643242B and MB811L643242B are
SDRAMs in a “4 banks x 512K words x 32 bits” con-
figuration, operating at supply voltages of 3.3V and
2.5V, respectively. These SDRAMs support the fol-
lowing settings:
• CAS latency: 2 or 3
• Burst length: 1, 2, 4, 8, or full page
• Burst type: Sequential or interleave
The package is an 86-pin TSOP with a pin pitch of
0.5 mm, fully conforming to JEDEC standards. The
MB81F643242B Series consists of three speed ver-
sions: 143-MHz, 125-MHz, and 100-MHz. The
MB811L643242B also consists of three speed ver-
sions: 100-MHz, 84-MHz, and 67-MHz. Also, a low
power version is available.
FUJITSU also provides support for the SCITT functions
and for optional, extended operating-temperature
products for use in special environments.
Examples of applications for these SDRAMs are:
• High-speed model: Graphics card, digital TV,
game equipment, etc.
• Low-voltage model: Portable video camera,
digital camera, PDA, mobile computer,
consumer product built-in device, etc.
• Extended operating-temperature models:
Automotive equipment, such as a car
navigation system, application-specific
products, etc.
• Other applications: Copier, communications
equipment, etc.
Table 1 lists the major characteristics of these
SDRAMs and Figure 1 shows their pin assignments.
“. . . reduces the test time and
cost required for board-level
interconnection testing.”
17-3-b2.fm Page 32 Saturday, August 28, 1999 9:57 PM