DESCRIPTION

The IDT723654/723664/723674 is a monolithic, high-speed, low-power, CMOS bidirectional synchronous (clocked) FIFO memory which supports clock frequencies up to 83 MHz and has read access times as fast as 8ns. Two independent 2,048/4,096/8,192 x 36 dual-port SRAM FIFOs on board each chip buffer data in opposite directions. FIFO data on Port B can be input and output in 36-bit, 18-bit, or 9-bit formats with a choice of Big- or Little-Endian configurations.

FEATURES

• Memory storage capacity:

IDT723654 – 2,048 x 36 x 2

IDT723664 – 4,096 x 36 x 2

IDT723674 – 8,192 x 36 x 2

• Clock frequencies up to 83 MHz (8ns access time)

• Two independent clocked FIFOs buffering data in opposite directions

• Select IDT Standard timing (using EFA, EFB, FFA, and FFB flags functions) or First Word Fall Through Timing (using ORA, ORB, IRA, and IRB flag functions)

• Programmable Almost-Empty and Almost-Full flags; each has five default offsets (8, 16, 64, 256 and 1,024 )

• Serial or parallel programming of partial flags

• Port B bus sizing of 36 bits (long word), 18 bits (word) and 9 bits (byte)

• Big- or Little-Endian format for word and byte bus sizes

• Retransmit Capability

• Master Reset clears data and configures FIFO, Partial Reset clears data but retains configuration settings

• Mailbox bypass registers for each FIFO

• Free-running CLKA and CLKB may be asynchronous or coincident (simultaneous reading and writing of data on a single clock edge is permitted)

• Auto power down minimizes power dissipation

• Available in space saving 128-pin Thin Quad Flatpack (TQFP)

• Pin compatible to the lower density parts, IDT723624/723634/723644

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