Texas Instruments SN74V293-10PZA

Overview

SN74V293-10PZA from Texas Instruments is a 65536 × 18/131072 × 9, 3.3-V CMOS first-in, first-out (FIFO) memory with independent read/write clocks, 166-MHz operation, 6-ns read/write cycle time, and user-selectable ×9/×18 bus sizing for high-throughput data buffering in telecom and video systems.

For engineers reviewing the SN74V293-10PZA datasheet, SN74V293-10PZA pinout, SN74V293-10PZA application, or SN74V293-10PZA equivalent, key selection criteria include FWFT vs. standard timing mode, programmable almost-empty/full flag offsets, zero-latency retransmit capability, big/little-endian byte ordering, and 5-V-tolerant inputs for mixed-voltage interfacing.

Technical Context

This FIFO implements dual-clock asynchronous architecture with fully independent RCLK and WCLK domains-each operable from 0 to 166 MHz-with no frequency ratio constraints. It supports both first-word fall-through (FWFT) and standard timing modes, selected at master reset via the FWFT/SI pin.

Flag logic includes EF/OR, FF/IR, HF, PAE, and PAF outputs, with PAE and PAF programmable via serial or parallel loading of 8-bit offset registers. Retransmit functionality resets the read pointer on RT assertion, with zero-latency mode enabled by RM low during MRS.

Key Specifications

Pinout & Package

SN74V293-10PZA is housed in an 80-pin Thin Quad Flat Pack (TQFP) package with exposed thermal pad, optimized for high-density PCB layouts and thermal management in industrial and telecom modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72V2105L15PF and NB3N502M, SN74V293-10PZA uniquely combines maximum depth (65536 × 18), sub-6-ns timing, 5-V-tolerant inputs, and full bus-width programmability-making it optimal for high-reliability, multi-standard interface bridging where design margin and future-proofing matter.

Availability

SN74V293-10PZA is available at Aetrix Electronics and suitable for telecom infrastructure, broadcast video equipment, and industrial protocol gateways requiring stable component supply across extended product lifecycles.

Supply support for SN74V293-10PZA 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 over 50 years of innovation in high-performance timing and interface ICs.

The SN74V293-10PZA belongs to TI's high-speed FIFO memory family, engineered specifically for deterministic data buffering in network, video, and DSP-intensive systems demanding deep storage and nanosecond-level timing precision.

FAQ

What is the maximum operating frequency of the SN74V293-10PZA?

The SN74V293-10PZA supports up to 166 MHz on both read and write clocks, enabling real-time throughput of over 2.9 Gbps in ×18 mode. This specification is guaranteed across commercial temperature range and 3.3-V ±5% supply, with timing validated per SCAS669D revision February 2003.

Does the SN74V293-10PZA support both FWFT and standard timing modes?

Yes, the SN74V293-10PZA supports both modes. The FWFT/SI pin determines selection during master reset: high enables first-word fall-through (OR/IR flags), low enables standard mode (EF/FF flags). Both modes retain full access to PAE, PAF, HF, and retransmit functions.

How is bus width configured on the SN74V293-10PZA?

Bus width is set independently for input and output ports using IW (input width) and OW (output width) pins during master reset. Per Table 1 in SCAS669D, low/high states yield ×18/×9 combinations-e.g., IW=L and OW=H configures ×18 write port and ×9 read port for data unpacking.

Can the SN74V293-10PZA be used with 5-V logic interfaces?

Yes-the SN74V293-10PZA features 5-V-tolerant inputs (D0–D17, WEN, REN, MRS, etc.), allowing direct connection to 5-V microcontrollers, FPGAs, or legacy peripherals without level shifters. Outputs remain 3.3-V LVTTL and are not 5-V tolerant.

What is the purpose of the PRS (partial reset) pin on the SN74V293-10PZA?

The PRS pin resets read/write pointers and output register to zero while preserving all configuration settings-including bus width, timing mode, flag offsets, endian format, and retransmit latency-enabling safe mid-operation buffer clearing without reinitializing hardware setup. This avoids interrupting ongoing data flow control logic.

How does zero-latency retransmit work on the SN74V293-10PZA?

When RM is held low during master reset, asserting RT on a rising RCLK edge causes the first retransmitted word to appear on Q outputs aligned with that same RCLK edge-no additional clock cycles needed. This behavior is confirmed in Figures 13–14 of SCAS669D and applies identically in both FWFT and standard modes.