Texas Instruments SN74V263-15PZA

Overview

SN74V263-15PZA from Texas Instruments is a 3.3-V CMOS 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-speed DSP interfacing and telecom data buffering where deterministic latency and zero-latency retransmit are critical.

For engineers reviewing the SN74V263-15PZA datasheet, SN74V263-15PZA pinout, SN74V263-15PZA application, or SN74V263-15PZA equivalent, key selection considerations include FWFT vs. standard timing mode configuration, big/little-endian byte alignment, programmable almost-empty/full flag offsets, independent RCLK/WCLK domains, and 5-V-tolerant input compatibility with legacy logic interfaces.

Technical Context

This FIFO implements dual-clock asynchronous architecture with fully independent read and write clock domains (RCLK/WCLK), enabling simultaneous data ingestion and egress without arbitration. Its fixed first-word latency (three RCLK cycles in FWFT mode) and zero-latency retransmit capability-enabled by RM pin during master reset-are hardwired features of the silicon design.

The device supports four bus-matching configurations (×9/×9, ×9/×18, ×18/×9, ×18/×18) via IW/OW pins at master reset, and includes dedicated flag logic for EF/OR, FF/IR, HF, PAE, and PAF-with PAE/PAF offset programming supported serially (via FWFT/SI + SEN) or in parallel (via Dn + WEN), both configurable at initialization.

Key Specifications

Pinout & Package

SN74V263-15PZA is packaged in an 80-pin Thin Quad Flat Pack (TQFP), PZA variant, with exposed thermal pad and 0.5-mm pitch. Pin functions are defined at master reset and remain static during operation unless modified by partial reset (PRS).

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72V265L15PF and NB3N502M, SN74V263-15PZA uniquely combines 5-V-tolerant inputs, FWFT timing, ×9/×18 bus flexibility, and zero-latency retransmit - making it the only option among the three capable of glueless interfacing to legacy 5-V logic while sustaining 166-MHz throughput and sub-10-ns latency.

Availability

SN74V263-15PZA is available at Aetrix Electronics and suitable for telecom infrastructure, DSP-based video processing, industrial protocol gateways, and high-speed data acquisition systems requiring stable component supply across extended product lifecycles.

Supply support for SN74V263-15PZA 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 expertise in high-speed interface ICs and DSP ecosystem components.

SN74V263-15PZA belongs to TI's high-speed FIFO memory product line, designed specifically for deterministic data buffering in network, video, and telecommunications equipment where clock domain isolation, low latency, and flexible bus matching are mandatory.

FAQ

What is the maximum operating frequency of the SN74V263-15PZA?

The SN74V263-15PZA supports up to 166 MHz on both RCLK and WCLK inputs, delivering a guaranteed 6-ns read/write cycle time. This specification is validated across commercial temperature range (0°C to 70°C) and 3.3-V ±0.3-V supply, as confirmed in the SCAS669D datasheet revision February 2003. Operation above 166 MHz is not characterized or guaranteed for SN74V263-15PZA.

Does the SN74V263-15PZA support both FWFT and standard timing modes?

Yes, the SN74V263-15PZA supports both modes. The FWFT or standard mode is selected by the logic level on the FWFT/SI pin during master reset (MRS). In FWFT mode, the first word appears on Q outputs after three RCLK edges without REN; in standard mode, every read-including the first-requires REN assertion. This configuration is latched at power-up and remains active until next MRS.

Can the SN74V263-15PZA be used with 5-V logic signals?

Yes, all input pins of the SN74V263-15PZA - including control signals (WEN, REN, MRS, etc.) and data inputs (D0–D17) - are 5-V tolerant. They accept voltages from 0 V to 5.5 V while operating from a 3.3-V supply. However, output pins (Q0–Q17) are not 5-V tolerant and must interface only with 3.3-V–compatible receivers.

How is bus width configured on the SN74V263-15PZA?

Bus width is configured via IW (input width) and OW (output width) pins during master reset. Table 1 in the SCAS669D datasheet defines four combinations: L/L = ×18/×18, L/H = ×18/×9, H/L = ×9/×18, H/H = ×9/×9. These settings determine active pin usage (e.g., D0–D8 only in ×9 mode) and internal RAM addressing - and remain fixed until next MRS.

What is the function of the RM pin on the SN74V263-15PZA?

The RM (retransmit latency mode) pin selects zero-latency or normal-latency retransmit behavior during master reset. When RM is low at MRS, the first retransmitted word appears on Q outputs synchronized to the same RCLK edge that sampled RT low. When RM is high, retransmit follows normal latency (one additional RCLK cycle). This setting persists until next MRS.