Texas Instruments SN74V263-6PZA

Overview

SN74V263-6PZA from Texas Instruments is a 3.3-V CMOS first-in, first-out (FIFO) memory with 8192 × 18 or 16384 × 9 configurable depth/width, 166-MHz operation, 6-ns read/write cycle time, and independent asynchronous read/write clocks - deployed in high-speed data buffering between mismatched buses in telecom and DSP interfacing.

For engineers reviewing the SN74V263-6PZA datasheet, SN74V263-6PZA pinout, SN74V263-6PZA application, or SN74V263-6PZA equivalent, key selection considerations include bus-matching flexibility (×9/×18 in/out), FWFT vs. standard timing mode, programmable almost-empty/full flags with serial/parallel offset loading, zero-latency retransmit capability, and 5-V-tolerant inputs for mixed-voltage system integration.

Technical Context

This FIFO implements dual-clock architecture with fully independent RCLK and WCLK domains (0–166 MHz), enabling simultaneous read/write without synchronization logic. It supports four bus-sizing configurations via IW/OW pins and big/little-endian byte ordering controlled by BE during master reset.

Flag logic includes EF/OR, FF/IR, HF, PAE, and PAF - with PAE/PAF programmable via eight default offsets or custom values loaded serially (FWFT/SI + SEN) or in parallel (Dn + WEN). Retransmit is initiated by RT on RCLK edge, with latency mode selected by RM at master reset.

Key Specifications

Pinout & Package

SN74V263-6PZA is housed in an 80-pin Thin Quad Flat Pack (TQFP) package with exposed thermal pad (PZA suffix), compliant with JEDEC MO-220 standard. Pin functions are validated per SCAS669D datasheet Figure 1 and Terminal Functions table.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72V263, SN74V263-6PZA provides 5-V-tolerant inputs and FWFT mode for lower latency, while SN74V265-6PZA offers identical pin compatibility plus JTAG support - making SN74V263-6PZA optimal for mixed-voltage, low-jitter buffering where test infrastructure is not required.

Availability

SN74V263-6PZA is available at Aetrix Electronics and suitable for telecom infrastructure, DSP interfacing, video processing, and industrial protocol gateway applications requiring stable component supply and long-term obsolescence management.

Supply support for SN74V263-6PZA 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 logic solutions, with over 90 years of innovation in high-reliability components.

The SN74V263-6PZA belongs to TI's high-speed FIFO memory product line, engineered specifically for deterministic, low-latency data buffering in network, video, and DSP subsystems where clock domain isolation and bus-width adaptation are critical.

FAQ

What memory organization does SN74V263-6PZA support?

SN74V263-6PZA supports two memory organizations: 8192 × 18 and 16384 × 9. The selection is determined at master reset by the states of the IW (input width) and OW (output width) pins. This dual-configuration capability allows flexible adaptation to varying data-path widths in systems such as DSP-to-peripheral bridging or multi-standard telecom interfaces - all within a single SN74V263-6PZA device.

Does SN74V263-6PZA support 5-V logic interfaces?

Yes, SN74V263-6PZA features 5-V-tolerant inputs on all control and data pins (D0–D17, WEN, REN, MRS, etc.), allowing direct connection to 5-V CMOS or TTL logic without external level shifters. This capability is explicitly confirmed in the SCAS669D datasheet and simplifies integration into mixed-voltage systems - a key advantage over many competing FIFOs that require voltage translation for 5-V signal sources. The SN74V263-6PZA itself operates from a 3.3-V supply.

How does the first-word fall-through (FWFT) mode work in SN74V263-6PZA?

In FWFT mode - enabled by asserting FWFT/SI high during master reset - the first word written to an empty SN74V263-6PZA appears on Q0–Q17 after exactly three rising edges of RCLK, without requiring REN to be asserted. Subsequent words still require REN activation. This eliminates initial read latency in burst-oriented applications like video frame capture or packet header pre-fetch, distinguishing SN74V263-6PZA from standard FIFOs where every read, including the first, depends on REN.

Can SN74V263-6PZA be used in zero-latency retransmit applications?

Yes, SN74V263-6PZA supports zero-latency retransmit when RM is held low during master reset. In this mode, asserting RT low on a rising RCLK edge causes the first retransmitted word to appear on Q0–Q17 synchronously with that same RCLK edge - no additional clock cycles are needed. This behavior is validated in Figures 13–14 of SCAS669D and is essential for real-time test equipment and loopback diagnostics where deterministic replay timing is mandatory.

What packaging and thermal characteristics apply to SN74V263-6PZA?

SN74V263-6PZA is supplied in an 80-pin Thin Quad Flat Pack (TQFP) with thermal pad, designated PZA per TI's packaging nomenclature. It complies with JEDEC MO-220, has a body size of 12 mm × 12 mm, and incorporates an exposed copper pad for enhanced thermal dissipation. The package supports standard reflow profiles and is rated for operation from –40°C to +85°C ambient - meeting industrial temperature requirements without derating. This PZA package is identical across the SN74V263/265/273 family.