Texas Instruments SN74V283-6PZA

Overview

SN74V283-6PZA from Texas Instruments is a 32768 × 18 / 65536 × 9 high-speed CMOS FIFO memory with independent read/write clocks, user-selectable ×9/×18 bus sizing, and FWFT or standard timing modes. It operates at 166 MHz with 6-ns read/write cycle time, supports big/little-endian byte ordering, and delivers zero-latency retransmit capability. It is used in DSP interfacing, video buffering, and telecom data stream alignment.

For engineers reviewing the SN74V283-6PZA datasheet, SN74V283-6PZA pinout, SN74V283-6PZA application, or SN74V283-6PZA equivalent, key selection criteria include its dual-port width configurability (×9/×18), programmable almost-empty/almost-full flag offsets, 5-V-tolerant inputs, fixed first-word latency, and TQFP-80 package compatibility with TI 'C6x DSPs.

Technical Context

This FIFO implements asynchronous dual-clock architecture with fully independent RCLK and WCLK domains-each supporting 0–166 MHz operation without inter-clock frequency constraints. Its RAM array is sized at 32768 × 18 (or 65536 × 9) bits, and bus-matching logic allows dynamic input/output port width selection via IW and OW pins during master reset.

Flag generation uses dedicated hardware logic for EF/OR, FF/IR, HF, PAE, and PAF-with PAE/PAF offset registers programmable via serial (FWFT/SI + SEN) or parallel (Dn + WEN) methods. Retransmit functionality resets the read pointer on RT assertion, with zero-latency mode enabled by RM low during MRS.

Key Specifications

Pinout & Package

SN74V283-6PZA is packaged in an 80-pin Thin Quad Flat Pack (TQFP) with exposed thermal pad (PZA suffix). Pin functions are defined during master reset and support full configuration of timing mode, endianness, flag defaults, and bus width.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar FIFO memory applications.

Compared with SN74V273-6PZA, SN74V283-6PZA provides 2× deeper buffering for jitter-prone streams; compared with SN74V293-6PZA, it offers optimal balance of capacity, pin count, and power in mid-tier telecom and imaging systems.

Availability

SN74V283-6PZA is available at Aetrix Electronics and suitable for video frame buffering, DSP data streaming, and telecom packet alignment requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for SN74V283-6PZA includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and digital signal technologies, with decades of leadership in high-speed interface solutions.

The SN74V2xx FIFO family was designed specifically for glueless, high-bandwidth interfacing between TI's 'C6x DSPs and external data sources-emphasizing low-latency, flexible bus matching, and robust flag signaling for real-time systems.

FAQ

What is the memory organization of SN74V283-6PZA?

The SN74V283-6PZA supports two configurable memory organizations: 32768 words × 18 bits or 65536 words × 9 bits. This dual-mode architecture is selected at power-up via the IW and OW pins during master reset, enabling seamless adaptation to either wide-data or narrow-bus system architectures without redesigning the PCB layout or firmware interface layer. The SN74V283-6PZA maintains full feature parity-including flag behavior and timing-across both configurations.

Does SN74V283-6PZA support 5-V logic interfaces?

Yes, SN74V283-6PZA features 5-V-tolerant inputs, allowing direct connection to 5-V CMOS or TTL signal sources without external level shifters. This applies to all control inputs (WCLK, RCLK, WEN, REN, MRS, etc.) and data inputs (D0–D17), but not outputs-Q0–Q17 are 3.3-V CMOS only and must not be driven into 5-V buses. The SN74V283-6PZA's VCC is strictly 3.3 V ± 0.3 V.

How does the first-word fall-through (FWFT) mode work in SN74V283-6PZA?

In FWFT mode-enabled by asserting FWFT/SI high during master reset-the first word written to an empty SN74V283-6PZA appears on Q0–Q17 after exactly three rising edges of RCLK, regardless of REN state. Subsequent words still require REN = low to be clocked out. This eliminates initial read-setup latency in streaming applications. The SN74V283-6PZA's OR flag goes high to indicate valid data availability, replacing EF in this mode.

Can SN74V283-6PZA be used with TI C6000-series DSPs?

Yes, SN74V283-6PZA is explicitly optimized for glueless interface with TI C6000 DSPs (e.g., TMS320C6748, C6455) via their External Memory Interface (EMIF) or Expansion Bus (XBus). Its timing parameters, flag signaling (EF/OR, FF/IR), and control protocol align directly with TI's application reports SPRA534 and SPRA547. The SN74V283-6PZA's 166-MHz operation meets or exceeds typical C6000 EMIF speeds, and its ×9/×18 flexibility matches common DSP data-path widths.

What is the purpose of the RM pin on SN74V283-6PZA?

The RM (Retransmit Latency Mode) pin on SN74V283-6PZA selects zero-latency or normal-latency retransmit behavior during master reset: RM = low enables zero-latency mode, where the first retransmitted word appears on Q outputs synchronized to the same RCLK edge that sampled RT low; RM = high selects normal latency, requiring one additional RCLK cycle. This setting persists until next MRS and directly affects real-time debug trace replay and multi-pass data processing workflows using the SN74V283-6PZA.