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Hitachi ZBL SRAMs operate up to 250MHz

Posted: 02 May 2002 ?? ?Print Version ?Bookmark and Share

Keywords:zbl sram? zero bus latency? zbt sram? zero bus turnaround? hm66wp18512?

Designed using the company's 0.185m CMOS process, Hitachi Ltd's series of 9Mb/18Mb zero bus latency (ZBL) SRAMs operate up to 250MHz and are used as buffer or table memories in communication equipment such as routers and switches.

The 9Mb HM66WP18512/3 and HM66WP36256/7 series, and 18Mb HM66WP18100/1 and HM66WP36512/3 series, does not provide dead cycles during random R/W operations and are compatible with zero bus turnaround (ZBT) SRAMs.

The memories support both 2.5V and 3.3V supply voltages, and consume 250mA (max.) of current for the 9Mb models, and 300mA (max.) for the 18Mb versions.

The HM66WP18512, HM66WP36256, HM66WP18100, and HM66WP36512 are pipelined-burst SRAMs with registers for I/O. The HM66WP18513, HM66WP36257, HM66WP18101, and HM66WP36513 are flow through types that use the registers only for input and an LVTTL interface for I/O interface.

The SRAMs are offered in x18 or x36 configurations and are shipped in a 14-by-22mm, 119-pin BGA or 16-by-22mm, 100-pin LQFP casing. They are also available in 100, 117, 133, 166, and 200MHz operating frequencies.

For BGA package models, an IEEE standard test access port and boundary scan architecture (IEEE 1149.1-1990) are supported, enabling a compatible connection check to be conducted at the board level when module mounting is carried out.

Pricing ranges from $18.82 to $43.92, depending on the specification.

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