Texas Instruments SN74V263-7PZA

Overview

SN74V263-7PZA 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 user-selectable ×9/×18 bus sizing - deployed in high-throughput network buffering and DSP interfacing applications.

For engineers reviewing the SN74V263-7PZA datasheet, SN74V263-7PZA pinout, SN74V263-7PZA application, or SN74V263-7PZA equivalent, key selection criteria include FWFT vs. standard timing mode configuration, big/little-endian data formatting, zero-latency retransmit capability, and programmable almost-empty/almost-full flag offsets with serial or parallel loading.

Technical Context

This FIFO implements independent synchronous read and write clock domains (RCLK/WCLK), enabling simultaneous data ingestion and egress without arbitration logic. Its dual-mode timing architecture supports either first-word fall-through (FWFT) - delivering the first word after three RCLK edges without REN assertion - or standard mode requiring explicit REN activation for all reads.

Configuration occurs at master reset via dedicated control pins (IW/OW/BE/FWFT/SI/RM/PFM/IP), defining bus width, endianness, retransmit latency, flag timing (synchronous/asynchronous), and parity handling. Flag logic includes EF/OR, FF/IR, HF, PAE, and PAF - with PAE/PAF offset values programmable via serial (SEN+FWFT/SI) or parallel (WEN+Dn) methods.

Key Specifications

Pinout & Package

SN74V263-7PZA 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 assignments 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 IDT72V263L15PF and NB3N502M, SN74V263-7PZA uniquely delivers 5-V-tolerant control inputs, ×9/×18 bus configurability, FWFT timing, and zero-latency retransmit - making it optimal for mixed-voltage DSP and telecom infrastructure where flexibility and deterministic latency are mandatory.

Availability

SN74V263-7PZA is available at Aetrix Electronics and suitable for network packet buffering, DSP data streaming, video frame synchronization, and telecom line card buffering requiring stable component supply and long-term industrial lifecycle support.

Supply support for SN74V263-7PZA 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 heritage in high-performance memory and interface ICs.

SN74V263-7PZA belongs to TI's high-speed FIFO memory product line, engineered specifically for demanding data buffering in networking, telecommunications, and digital signal processing systems where clock domain isolation and deterministic latency are critical.

FAQ

What memory organization options does the SN74V263-7PZA support?

The SN74V263-7PZA supports two memory configurations: 8192 × 18 (147,456 bits) and 16384 × 9 (147,456 bits), selected at master reset using the IW and OW control pins. This dual-organization capability enables seamless adaptation to either wide-data or narrow-bus system architectures without changing hardware layout.

How does the FWFT mode affect read latency in the SN74V263-7PZA?

In FWFT mode, the SN74V263-7PZA delivers the first word written to an empty FIFO directly to the Q outputs after exactly three rising edges of RCLK - with no REN assertion required. Subsequent words still require REN activation. This eliminates initial read setup delay, improving responsiveness in burst-oriented applications like packet header inspection.

Can the SN74V263-7PZA interface directly with 5-V logic circuits?

Yes, the SN74V263-7PZA features 5-V-tolerant inputs (including WEN, REN, MRS, PRS, RT, and all control pins), allowing direct connection to 5-V CMOS/TTL signal sources without external level shifters. The device itself operates at 3.3 V, and outputs are not 5-V tolerant - Q0–Q17 must interface only with 3.3-V receivers.

What is the function of the RM pin on the SN74V263-7PZA?

The RM (Retransmit Latency Mode) pin on the SN74V263-7PZA selects zero-latency or normal-latency retransmit behavior during master reset. When RM is low at MRS, asserting RT on a rising RCLK edge places the first retransmitted word on Q outputs synchronously with that same edge - enabling immediate data replay without pipeline penalty in retry-based protocols.

How are programmable flags (PAE/PAF) configured on the SN74V263-7PZA?

PAE and PAF thresholds on the SN74V263-7PZA are configured either by selecting one of eight factory-default offsets using FSEL0, FSEL1, and LD during master reset - or by loading custom values via serial (SEN + FWFT/SI) or parallel (WEN + Dn) programming. The PFM pin determines whether flag transitions occur synchronously or asynchronously relative to RCLK/WCLK.