Texas Instruments SN74ALVC7813-20DL

Overview

SN74ALVC7813-20DL from Texas Instruments is a low-power, clocked 64 × 18-bit first-in, first-out (FIFO) memory IC designed for asynchronous data buffering between independent clock domains. It operates from 3.0 V to 3.6 V, supports up to 50 MHz read/write clocks, delivers 13 ns access time with 50-pF load, and features synchronized input-ready (IR) and output-ready (OR) flags. It is used in bidirectional data path bridging between mismatched clock systems such as CPU-to-peripheral or FPGA-to-ASIC interfaces.

For engineers reviewing the SN74ALVC7813-20DL datasheet, SN74ALVC7813-20DL pinout, SN74ALVC7813-20DL application, or SN74ALVC7813-20DL equivalent, key selection criteria include its dual-clock synchronization architecture, programmable almost-full/almost-empty flag offsets, half-full flag, and compatibility with 3.3-V logic families in high-speed buffering designs.

Technical Context

The SN74ALVC7813-20DL implements a synchronous dual-port FIFO with independent write clock (WRTCLK) and read clock (RDCLK), both free-running and capable of asynchronous or coincident operation. Its internal RAM stores 64 words of 18 bits each, with status flags (HF, AF/AE, IR, OR) generated by dedicated pointer and flag logic synchronized to respective clocks.

Write operations occur on the rising edge of WRTCLK when WRTEN1 is high, WRTEN2 is low, and IR is high; reads occur on the rising edge of RDCLK when RDEN, OE1, and OE2 are low and OR is high. The FIFO supports programmable AF/AE offset values via D0–D7 and PEN control during reset initialization, enabling configurable depth thresholds without external logic.

Key Specifications

Pinout & Package

Packaged in a 56-pin Shrink Small-Outline (DL) package with 300-mil body width and 25-mil center-to-center lead spacing, optimized for high-density PCB layouts while maintaining manufacturability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ACT7813 and IDT7203L15TPG, the SN74ALVC7813-20DL uniquely balances 3.3-V compatibility, 18-bit native width, programmable depth thresholds, and pin-to-pin equivalence to TI's ACT-family FIFOs-making it optimal for upgrading 5-V designs to low-voltage operation without sacrificing feature set or layout reuse.

Availability

SN74ALVC7813-20DL is available at Aetrix Electronics and suitable for high-speed data acquisition, multi-clock domain bridging, protocol translation, and configurable buffering applications requiring stable component supply and long-term industrial availability.

Supply support for SN74ALVC7813-20DL 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 innovation in high-reliability interface and memory products.

The SN74ALVC7813-20DL belongs to TI's Widebus™ family of advanced CMOS logic devices, engineered specifically for low-voltage, high-speed clocked FIFO applications in data-intensive communication and control systems.

FAQ

What is the maximum operating frequency supported by the SN74ALVC7813-20DL?

The SN74ALVC7813-20DL supports a maximum clock frequency of 50 MHz for both read and write operations under recommended conditions (VCC = 3.0 V to 3.6 V, TA = 0°C to 70°C). This rating is confirmed by timing specifications in the SCAS594A datasheet, where t_clock min = 20 ns corresponds to 50 MHz. Performance remains stable across the full voltage and temperature range without derating.

Does the SN74ALVC7813-20DL require power-on reset, and how is it implemented?

Yes, the SN74ALVC7813-20DL must be reset upon power-up. The RESET pin must be asserted low while at least four rising edges occur on both WRTCLK and RDCLK to clear internal synchronizers and initialize flags (IR, OR, HF low; AF/AE high). This ensures deterministic startup behavior and prevents undefined flag states that could disrupt downstream logic.

How does the programmable AF/AE flag work on the SN74ALVC7813-20DL?

The SN74ALVC7813-20DL allows programming of almost-full/almost-empty thresholds via PEN and D0–D7. After reset and before the first write, holding PEN low during a WRTCLK↑ latches D0–D7 as the almost-empty offset (X); a second low PEN pulse sets the almost-full offset (Y). Default values are X = Y = 8, yielding AF/AE high when ≤8 or ≥56 words are stored.

Is the SN74ALVC7813-20DL pin-compatible with other TI FIFO devices?

Yes, the SN74ALVC7813-20DL is pin-to-pin compatible with SN74ACT7803, SN74ACT7805, and SN74ACT7813 per the SCAS594A datasheet. This enables direct substitution in existing 5-V ACT-based designs when migrating to 3.3-V operation, provided voltage translation is handled externally or the system supports mixed-supply operation.

What package type is used for the SN74ALVC7813-20DL, and what are its key mechanical features?

The SN74ALVC7813-20DL uses a 56-pin Shrink Small-Outline (DL) package with a 300-mil body width and 25-mil center-to-center lead pitch. Its gull-wing lead form supports standard surface-mount assembly processes, and the compact footprint enables high-density routing in space-constrained applications such as modular instrumentation and embedded controllers.