Frequently Asked Questions about
CellularRAM™ Memory
What is CellularRAM memory?
What is the target market and applications
for CellularRAM devices?
What are the benefits of CellularRAM technology?
What are the specific features that distinguish
the CellularRAM family from existing SRAM architectures?
Why was the CellularRAM work group
founded?
Will other vendors be added to the CellularRAM team?
What is CellularRAM memory?
CellularRAM memory is a family of pseudo-SRAM (PSRAM) products
that are backward compatible with 6T (six-transistor) SRAM and
early generation Async or Page PSRAM. CellularRAM offers a complete
new set of devices with innovative functionality burst, providing
an evolutionary path to pseudo SRAM.
What is the target market and
applications for CellularRAM devices?
CellularRAM products target next generation handsets, but it can
be used anywhere cache or buffered memory is required.
What are the benefits of CellularRAM
technology?
CellularRAM technology's multiple benefits include backward compatibility
with standard asynchronous SRAM devices, a DRAM technology with
an SRAM interface, higher densities and performance for next-generation
cell phones, and a lower cost per bit than the current SRAM device.
What are the specific features that
distinguish the CellularRAM family from existing SRAM architectures?
6T-SRAM is most commonly used in densities of 2/4/8Mb in cell
phone designs. It features 70ns/85ns random cycle times with a
bandwidth of ~30 MB/s in a x16 configuration. Active power consumption
at 1.8V is 25mA. CellularRAM devices significantly exceed today’s
low-power 6T-SRAM in density and bandwidth, while keeping active
power consumption at equally low levels. CellularRAM products are
available in 16/32/64/128/256 Mb densities, feature a random cycle
time of 70ns at 1.8V, and allow a peak bandwidth of 208 MB/s in
burst mode.
Why was the CellularRAM work group founded?
Cypress Semiconductor Corporation (NYSE: CY), Qimonda, and Micron
Technology, Inc. (NYSE: MU) formed a cooperative alliance to mutually
develop, define, and deliver a next-generation pseudo-SRAM (PSRAM)
standard for cellular handset designs. These companies have been
joined by other top 12 world-wide PSRAM suppliers Etron Technologies,
Hynix, Enable, Silicon 7 and Winbond Electronics Corporation
in expanding the market acceptance of CellularRAM. These companies,
along with industry adopters, are working together to ensure customers
have high-quality sources for the new PSRAM by each developing
pin- and functionally compatible products. The CellularRAM work
group continues to deliver new memory standards with superior performance
to customers with the collective benefit of the members' wide range
of market experience and innovative technology.
Will other vendors be added
to the CellularRAM team?
The CellularRAM work group members are constantly reviewing technical
and/or market considerations to increase customer acceptance of
the CellularRAM standard. Any manufacturer who would like to support
the CellularRAM specification can contact the CellularRAM work
group team for membership information.
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