DESCRIPTION
The IDT72V3631/72V3641/72V3651 are pin and functionally compatible versons of the IDT723631/723641/723651, designed to run off a 3.3V supply for exceptionally low-power consumption. These devices are monolithic high-speed, low-power, CMOS clocked FIFO memory. It supports clock frequencies up to 67 MHz and has read access times as fast as 10ns. The 512/1,024/2,048 x 36 dual-port SRAM FIFO buffers data from port A to Port B. The FIFO memory has retransmit capability, which allows previously read data to be accessed again. The FIFO operates in First Word Fall Through mode and has flags to indicate empty and full conditions and conditions and two programmable flags (Almost-Full and Almost-Empty) to indicate when a selected number of words is stored in memory.

FEATURES
• Storage capacity:
   IDT72V3631 - 512 x 36
   IDT72V3641 - 1,024 x 36
   IDT72V3651 - 2,048 x 36
• Supports clock frequencies up to 67 MHz
• Fast access times of 10ns
• Free-running CLKA and CLKB can be asynchronous or coincident (permits simultaneous reading and writing of data on a single clock edge)
• Clocked FIFO buffering data from Port A to Port B
• Synchronous read retransmit capability
• Mailbox register in each direction
• Programmable Almost-Full and Almost-Empty flags
• Microprocessor interface control logic
• Input Ready (IR) and Almost-Full (AF) flags synchronized by CLKA
• Output Ready (OR) and Almost-Empty (AE) flags synchronized by CLKB
• Available in 132-pin plastic quad flat package (PQFP) or spacesaving 120-pin thin quad flat package (TQFP)
• Pin and functionally compatible versions of the 5V operating IDT723631/723641/723651
• Easily expandable in width and depth
• Industrial temperature range (–40°C to +85°C) is available