Texas Instruments SN74V293-15PZAG4

Overview

SN74V293-15PZAG4 from Texas Instruments is a 65536 × 18/131072 × 9, 3.3-V CMOS FIFO memory with independent read/write clocks, 166-MHz operation, and user-selectable ×9/×18 bus sizing. It delivers fixed 6-ns read/write cycle time, zero-latency retransmit, and FWFT or standard timing modes - deployed in high-throughput DSP interfacing and telecom buffering where depth, latency control, and bus-matching are critical.

For engineers reviewing the SN74V293-15PZAG4 datasheet, SN74V293-15PZAG4 pinout, SN74V293-15PZAG4 application, or SN74V293-15PZAG4 equivalent, key selection criteria include its 65536-word × 18-bit depth, programmable almost-empty/full flags with eight default offsets, big/little-endian byte formatting, 5-V-tolerant inputs, and TQFP-80 package compatibility with TI 'C6x DSPs.

Technical Context

This FIFO implements dual-clock asynchronous architecture with fully independent RCLK and WCLK domains (0–166 MHz), enabling simultaneous read/write without arbitration. Its RAM array is sized at 65536 × 18 bits (or 131072 × 9), supporting configurable input/output bus widths via IW/OW pins during master reset.

Flag logic includes EF/OR, FF/IR, HF, PAE, and PAF - with PAE/PAF programmable via serial or parallel loading and configurable for synchronous/asynchronous assertion using PFM. Retransmit is initiated by RT on RCLK edge and supports zero-latency mode selected by RM during MRS.

Key Specifications

Pinout & Package

SN74V293-15PZAG4 is housed in an 80-pin Thin Quad Flat Pack (TQFP) package (PZA), with 5-V-tolerant inputs, 3.3-V core operation, and thermal pad exposed on underside per TI SCAS669D.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72V2115L15PF and NB3N502DR2G, SN74V293-15PZAG4 uniquely combines 65536-word depth, FWFT timing, zero-latency retransmit, and full ×9/×18 bus configurability - making it irreplaceable in TI DSP-based systems requiring deterministic low-latency streaming and flexible data path adaptation.

Availability

SN74V293-15PZAG4 is available at Aetrix Electronics and suitable for network packet buffering, video frame synchronization, DSP data streaming, telecom channel aggregation, and high-speed protocol bridging requiring stable component supply across long-lifecycle industrial and communications programs.

Supply support for SN74V293-15PZAG4 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 focused on analog, embedded processing, and digital signal technologies, with decades of leadership in high-speed interface solutions.

The SN74V293-15PZAG4 belongs to TI's high-speed FIFO memory product line, engineered specifically for seamless, glueless integration with TI's TMS320C6x DSP family in demanding real-time data acquisition and streaming applications.

FAQ

What is the maximum operating frequency of the SN74V293-15PZAG4?

The SN74V293-15PZAG4 supports up to 166 MHz on both read and write clocks, enabling 6-ns read/write cycle times. This frequency applies to both RCLK and WCLK independently, with no inter-clock dependency - allowing full-duplex operation even when clocks run at different frequencies or phases. The 166-MHz rating is validated across commercial temperature range per TI SCAS669D.

Does the SN74V293-15PZAG4 support ×9 to ×18 bus conversion?

Yes, the SN74V293-15PZAG4 supports bidirectional bus-width conversion: ×9 input to ×18 output, ×18 input to ×9 output, ×9 to ×9, or ×18 to ×18 - selected at master reset via IW and OW pins. This eliminates external multiplexing logic when interfacing narrow peripheral buses to wide processor data paths, and is confirmed in Table 1 and Terminal Functions section of the SN74V293-15PZAG4 datasheet.

How does the zero-latency retransmit function work in the SN74V293-15PZAG4?

In the SN74V293-15PZAG4, zero-latency retransmit is activated when RM is low during master reset. When RT is asserted low on a rising RCLK edge, the first retransmitted word appears on Q0–Q17 *on that same RCLK edge*, without waiting for subsequent cycles. This behavior is exclusive to SN74V293-15PZAG4 among its family and is documented in Figures 13–14 and the "Retransmit Latency Mode" section of SCAS669D.

Can the SN74V293-15PZAG4 be used with 5-V logic interfaces?

Yes - all input pins of the SN74V293-15PZAG4 are 5-V tolerant, allowing direct connection to 5-V CMOS/TTL signal sources without level shifters. This is explicitly stated in the "Features" list and "Electrical Characteristics" section of the SN74V293-15PZAG4 datasheet. Outputs remain 3.3-V LVTTL and are not 5-V tolerant.

What package type is used for the SN74V293-15PZAG4?

The SN74V293-15PZAG4 uses an 80-pin Thin Quad Flat Pack (TQFP) package designated PZA, with exposed thermal pad. Pinout matches the standardized layout shown in Figure 2 (PZA PACKAGE, TOP VIEW) of SCAS669D, and is distinct from the 100-ball BGA (GGM) variant - confirmed by the "PZAG4" suffix per TI packaging nomenclature.