Texas Instruments SN74V293-7PZA

Overview

SN74V293-7PZA from Texas Instruments is a 65536 × 18 / 131072 × 9, 3.3-V CMOS first-in, first-out (FIFO) memory with independent read/write clocks, user-selectable ×9/×18 bus sizing, and FWFT/standard timing modes. It delivers 166-MHz operation, 6-ns read/write cycle time, and zero-latency retransmit for high-throughput data buffering in telecom and video systems.

For engineers reviewing the SN74V293-7PZA datasheet, SN74V293-7PZA pinout, SN74V293-7PZA application, or SN74V293-7PZA equivalent, key selection considerations include its 80-pin TQFP package, 5-V-tolerant inputs, programmable almost-empty/almost-full flags with eight default offsets, big/little-endian byte formatting, and dual-mode retransmit latency control via RM pin.

Technical Context

This FIFO implements asynchronous dual-clock architecture with fully independent RCLK and WCLK domains-each operable from 0 to 166 MHz-with no frequency ratio constraints. Its RAM array is sized at 65536 × 18 (or 131072 × 9), supporting flexible bus-matching via IW/OW pins during master reset.

It integrates configurable flag logic including EF/OR, FF/IR, HF, PAE, and PAF; all programmable via serial (SEN/FWFT/SI) or parallel (WEN/LD/Dn) methods. Retransmit is initiated by RT on RCLK edge, with zero-latency mode selectable via RM pin during MRS, and timing mode (FWFT vs. standard) set by FWFT/SI state at reset.

Key Specifications

Pinout & Package

SN74V293-7PZA is housed in an 80-pin Thin Quad Flat Pack (TQFP) package (PZA), RoHS-compliant, with 0.5-mm pitch and exposed thermal pad. Pin functions are validated per TI SCAS669D datasheet Figure 1 and Table 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72V2105L15PF and NB3N502FG, SN74V293-7PZA provides 2× greater depth, 6-ns cycle time, 5-V-tolerant I/O, and full configurability of timing mode, bus width, endianness, and retransmit latency-making it uniquely suited for high-performance, multi-protocol embedded systems requiring field-upgradable behavior.

Availability

SN74V293-7PZA is available at Aetrix Electronics and suitable for telecom infrastructure, broadcast video equipment, DSP-based signal processing, and industrial protocol gateways requiring stable component supply and long-term manufacturability.

Supply support for SN74V293-7PZA 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 logic solutions, with decades of experience in high-speed interface and memory products.

The SN74V293-7PZA belongs to TI's high-speed FIFO family designed specifically for asynchronous data buffering in network, video, and DSP systems-emphasizing deep memory, dual-clock independence, and field-programmable timing behavior.

FAQ

What is the maximum operating frequency of the SN74V293-7PZA?

The SN74V293-7PZA supports up to 166 MHz on both read and write clocks, with no requirement for clock synchronization or frequency ratio constraints. This allows full utilization of its 6-ns read/write cycle time in high-bandwidth applications such as telecom line cards and video frame buffers. The SN74V293-7PZA achieves this performance using TI's high-speed submicron CMOS process.

Does the SN74V293-7PZA support 5-V logic inputs?

Yes, the SN74V293-7PZA features 5-V-tolerant inputs across all control and data pins (D0–D17, WEN, REN, MRS, etc.), enabling direct interface with legacy 5-V microcontrollers, FPGAs, or level-shifting-free connections to mixed-voltage systems. This capability is explicitly confirmed in the SCAS669D datasheet and applies to the SN74V293-7PZA regardless of VCC = 3.3 V operation.

How does the first-word fall-through (FWFT) mode work on the SN74V293-7PZA?

In FWFT mode-enabled by asserting FWFT/SI high during master reset-the first word written to an empty SN74V293-7PZA appears on Q0–Q17 after exactly three RCLK rising edges, without requiring REN assertion. Subsequent words still require REN. This reduces initial latency for burst-start applications like packet forwarding or video frame capture, and is distinct from standard mode where every read, including the first, needs REN.

Can the SN74V293-7PZA be used to expand memory depth beyond 65536 words?

Yes, the SN74V293-7PZA supports depth expansion via FWFT-mode chaining: the Q outputs of one device connect directly to the D inputs of the next, with shared RCLK/WCLK and synchronized flag logic. No external glue logic is needed because FWFT ensures seamless handoff of the first word from upstream to downstream FIFO. This capability is documented in the SCAS669D application notes for TI DSP interfacing.

What is the function of the RM pin on the SN74V293-7PZA?

The RM (Retransmit Latency Mode) pin 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 on the same RCLK edge that samples RT low. RM = high selects normal latency, requiring one additional RCLK cycle. This setting persists until next MRS and directly affects deterministic replay timing in protocols like SRTP or video ARQ.