DESCRIPTION:

The IDT72805LB/72815LB/72825LB/72845LB are dual 18-bit-wide synchronous (clocked) First-in, First-out (FIFO) memories.

FEATURES:

• The IDT72805LB is equivalent to two IDT72205LB 256 x 18 FIFOs

• The IDT72815LB is equivalent to two IDT72215LB 512 x 18 FIFOs

• The IDT72825LB is equivalent to two IDT72225LB 1,024 x 18 FIFOs

• The IDT72845LB is equivalent to two IDT72245LB 4,096 x 18 FIFOs

• Offers optimal combination of large capacity (8K), high speed,

design flexibility, and small footprint

• Ideal for the following applications:

- Network switching

- Two level prioritization of parallel data

- Bidirectional data transfer

- Bus-matching between 18-bit and 36-bit data paths

- Width expansion to 36-bit per package

- Depth expansion to 8,192 words per package

• 10ns read/write cycle time, 6.5ns access time

• IDT Standard or First Word Fall Through timing

• Single or double register-buffered Empty and Full Flags

• Easily expandable in depth and width

• Asynchronous or coincident Read and Write clocks

• Asynchronous or synchronous programmable Almost-Empty

and Almost-Full flags with default settings

• Half-Full flag capability

• Output Enable puts output data bus in high-impedance state

• High-performance submicron CMOS technology

• Available in the 128-pin Thin Quad Flatpack (TQFP). Also

available for the IDT72805LB/72815LB/72825LB, in the 121-lead,

16 x 16 mm plastic Ball Grid Array (PBGA)

• Industrial temperature range (–40°C to +85°C) is available

• Green parts available, see ordering information