Texas Instruments SN74V263-7GGM

Overview

SN74V263-7GGM 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 data buffering for DSP interfacing and telecom line cards.

For engineers reviewing the SN74V263-7GGM datasheet, SN74V263-7GGM pinout, SN74V263-7GGM application, or SN74V263-7GGM equivalent, key selection criteria include FWFT vs. standard timing mode configuration, programmable almost-empty/full flag offsets, independent RCLK/WCLK domains, big/little-endian byte ordering, and zero-latency retransmit capability.

Technical Context

This FIFO implements dual-clock asynchronous operation with fully independent read and write clock domains (RCLK/WCLK), supporting 0–166 MHz frequencies without inter-clock dependency. It integrates a flexible ×9/×18 bus-matching architecture controlled by IW/OW pins during master reset, enabling dynamic port width assignment per application need.

The device features two distinct timing modes: First-Word Fall-Through (FWFT), where the first written word appears on Q outputs after three RCLK edges without REN assertion; and Standard mode, requiring explicit REN activation for all reads including the first. Mode selection is latched at master reset via FWFT/SI pin state.

Key Specifications

Pinout & Package

SN74V263-7GGM is housed in a 100-pin Ball Grid Array (BGA) package designated GGM per TI's SCAS669D datasheet. Pin functions are validated from the official top-view pinout diagram and terminal function table.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74V263-7GGM, SN74V273-7GGM doubles buffer depth with identical timing and features, while IDT72V263L15PF trades 2.5× slower speed and missing FWFT/retransmit capabilities for legacy compatibility and lower unit cost - making SN74V263-7GGM the optimal choice for high-throughput, low-latency DSP and telecom use cases.

Availability

SN74V263-7GGM is available at Aetrix Electronics and suitable for telecom infrastructure, DSP interfacing, network packet buffering, and industrial protocol gateway applications requiring stable component supply and long-term lifecycle support.

Supply support for SN74V263-7GGM 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 data-path components.

The SN74V263-7GGM belongs to TI's high-speed FIFO memory product line, engineered specifically for deterministic, low-latency data buffering in DSP-centric systems, telecom infrastructure, and real-time networking equipment.

FAQ

What memory configurations does the SN74V263-7GGM support?

The SN74V263-7GGM supports two memory organizations: 8192 words × 18 bits or 16384 words × 9 bits. Configuration is determined at master reset by the states of the IW (input width) and OW (output width) pins per Table 1 in the SCAS669D datasheet. Both configurations share the same physical pinout and timing specifications, allowing flexible system-level bus sizing without hardware changes.

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

In FWFT mode, the first word written to an empty SN74V263-7GGM appears on the Q outputs after exactly three rising edges of RCLK - without requiring REN assertion. Subsequent words still require REN to be active. This fixed, low-latency path eliminates initial read setup delay, making SN74V263-7GGM ideal for applications like packet header extraction where immediate data availability is critical.

Can the SN74V263-7GGM perform zero-latency retransmit, and how is it enabled?

Yes, the SN74V263-7GGM supports zero-latency retransmit. It is enabled by driving the RM (retransmit latency mode) pin low during master reset. When RT is asserted low on a rising RCLK edge under zero-latency mode, the first retransmitted word is placed on the Q outputs synchronized to that same RCLK edge - delivering deterministic replay timing essential for real-time protocol stacks and error recovery routines.

What is the purpose of the BE (big-endian/little-endian) pin on the SN74V263-7GGM?

The BE pin on the SN74V263-7GGM selects byte ordering when crossing ×18 and ×9 data widths. When BE = low at master reset, big-endian mode is selected: the most significant 9-bit half of a ×18 word is read first. When BE = high, little-endian mode applies: the least significant 9-bit half is read first. This ensures correct data alignment in mixed-width systems such as DSP-to-FPGA interfaces or legacy protocol bridges.

Does the SN74V263-7GGM support 5-V logic interfacing, and which pins are tolerant?

Yes, the SN74V263-7GGM features 5-V-tolerant inputs on all control and data pins (D0–D17, WCLK, RCLK, WEN, REN, MRS, PRS, RT, FWFT/SI, IW, OW, BE, PFM, RM, FSEL0, FSEL1, LD, SEN, IP, OE). This tolerance allows direct connection to 5-V microcontrollers, FPGAs, or legacy logic without level shifters - while maintaining 3.3-V internal operation and signal integrity.