SN74V283-7PZA

FIFOs Memory Overview

The SN74V283 is a 3.3-V CMOS first-in, first-out (FIFO) memory with a capacity of 32768 × 18 bits or 65536 × 9 bits. It operates at frequencies up to 166 MHz with a 6-ns read/write cycle time. The device features user-selectable input and output bus widths (×9 or ×18), big-endian/little-endian byte representation, and 5-V tolerant inputs. It supports independent read and write clocks, zero-latency retransmit, and programmable almost-empty/full flags.

FIFOs Memory Feature Summary

• Supports flexible bus matching with selectable ×9 or ×18 data flow on both input and output ports.
• Provides configurable timing modes including First-Word Fall-Through (FWFT) and standard operation.
• Includes programmable flag offsets for almost-empty and almost-full conditions via serial or parallel loading.
• Features zero-latency retransmit capability allowing immediate rereading of data from the FIFO start.

FIFOs Memory Applications

• Network buffering applications requiring large data storage and bus size matching
• Video processing systems needing high-speed data throughput
• Telecommunications equipment utilizing asynchronous clock domains
• Data communications interfaces between disparate system components

FIFOs Memory Procurement Notes

Verify the specific ordering suffix matches the required package type, as the SN74V283 family is available in multiple configurations. Confirm that the selected variant aligns with the intended memory organization and pinout requirements for your design. Ensure compatibility with 3.3-V logic levels and check for any specific environmental or reliability certifications required by your application standards before finalizing procurement.

FIFOs Memory Selection Notes

Select the SN74V283 when deep memory depth combined with high-speed operation is necessary. Choose this component if your design requires independent read and write clocks or flexible bus width matching between ×9 and ×18 systems. Consider this part for applications demanding precise control over data latency through programmable flags and retransmit functions.

FIFOs Memory Part Context

The SN74V283 belongs to the Texas Instruments SN74V series of high-speed CMOS FIFO memories. This series includes variants like the SN74V263, SN74V273, and SN74V293, which differ primarily in memory depth. The SN74V283 specifically offers 32768 × 18 or 65536 × 9 bit capacities, positioning it between the smaller SN74V273 and the larger SN74V293 in terms of storage capability within the same functional family.

FIFOs Memory Replacement Considerations

SN74V273PZA

FIFOs Memory FAQ

How does the First-Word Fall-Through (FWFT) mode affect data access?

In FWFT mode, the first word written to an empty FIFO appears on the outputs after three RCLK cycles without requiring the Read Enable (REN) signal to be asserted. Subsequent words require REN to be low for access.

What is the function of the Retransmit (RT) pin?

Asserting the RT pin low during a rising RCLK edge resets the read pointer to the first location of the memory array, allowing data to be reread from the beginning without disturbing the write pointer or other settings.

Can the input and output bus widths be different?

Yes, the SN74V283 supports flexible bus matching. The input width (IW) and output width (OW) can be configured independently to be either ×9 or ×18, allowing for conversions such as ×18 input to ×9 output.