Texas Instruments SN74ACT7882-30PN

Overview

SN74ACT7882-30PN from Texas Instruments is a clocked first-in, first-out (FIFO) memory IC organized as 2048 × 18 bits, supporting independent asynchronous read/write operations synchronized to separate system clocks, with 33.4 MHz maximum clock frequency, 18 ns propagation delay (RDCLK→Q), and programmable almost-full/almost-empty flag logic. It serves as a data buffering interface between mismatched-speed digital subsystems in telecom backplanes and industrial controller I/O modules.

For engineers reviewing the SN74ACT7882-30PN datasheet, SN74ACT7882-30PN pinout, SN74ACT7882-30PN application, or SN74ACT7882-30PN equivalent, key selection considerations include its 80-pin LQFP (PN) package, dual-clock domain synchronization capability, 11 ns access time at 50-pF load, and cascading support for word-width/depth expansion in high-reliability embedded systems.

Technical Context

The SN74ACT7882-30PN implements a synchronous FIFO architecture with independent read and write pointer control logic, reset-synchronized status flag initialization, and programmable AF/AE offset via DAF-triggered capture of D9–D0 during RESET. Its dual-clock operation isolates read and write domains while maintaining deterministic latency through dedicated RDCLK and WRTCLK inputs.

Status flags-including OR (output-ready), IR (input-ready), HF (half-full), and AF/AE (programmable almost-full/almost-empty)-are edge-triggered and synchronized to their respective clocks, enabling precise flow control without external arbitration logic. The device supports cascading in both word width (parallel data bus extension) and word depth (serial chaining) using OR/IR handshaking signals.

Key Specifications

Pinout & Package

SN74ACT7882-30PN uses an 80-pin shrink quad flat package (LQFP-PN), measuring 14.0 mm × 14.0 mm × 1.4 mm, with 0.5 mm lead pitch and RoHS-compliant Cu/NiPdAu finish. Thermal resistance θ_JA = 62°C/W supports operation up to 70°C ambient without forced airflow.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ACT7881-30PN and SN74ACT7811-30PN, the SN74ACT7882-30PN uniquely delivers programmable AF/AE thresholding and full 2048-word depth in the same 80-pin LQFP package-enabling adaptive flow control and higher data throughput without board redesign.

Availability

SN74ACT7882-30PN is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, medical imaging systems, and automotive ADAS requiring stable component supply and long-term production continuity.

Supply support for SN74ACT7882-30PN 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 technologies with over 50 years of innovation in high-reliability industrial and communications ICs.

The SN74ACT7882-30PN belongs to TI's Widebus™ family of high-speed interface logic devices, engineered specifically for deterministic data buffering in multi-clock-domain systems where timing predictability and signal integrity are critical.

FAQ

What is the maximum operating frequency of the SN74ACT7882-30PN?

The SN74ACT7882-30PN supports a maximum clock frequency of 33.4 MHz for both WRTCLK and RDCLK inputs under recommended operating conditions (VCC = 4.5 V to 5.5 V, TA = 0°C to 70°C). This rating is verified per the SCAS445C datasheet timing specifications and corresponds to the -30 speed grade designation. Operation above this frequency may result in setup/hold violations or metastability in status flags.

How does the programmable AF/AE flag work on the SN74ACT7882-30PN?

The SN74ACT7882-30PN implements programmable AF/AE flag logic via the DAF input: a high-to-low transition on DAF captures the binary value on D9–D0 as the AF/AE offset X, which is then latched during the subsequent RESET cycle. When DAF is held high during RESET, the default X = 256 is used. The flag asserts high when FIFO occupancy ≤ X or ≥ (2048 – X), enabling custom buffer management policies.

Can the SN74ACT7882-30PN be cascaded for deeper memory capacity?

Yes, the SN74ACT7882-30PN supports word-depth expansion by connecting multiple units in series: the OR flag of one device drives the IR input of the next, ensuring continuous data flow through the chain. This configuration scales total depth linearly (e.g., two devices yield 4096 × 18 bits) while preserving independent clock domains and status flag functionality across all stages.

What package type and dimensions does the SN74ACT7882-30PN use?

The SN74ACT7882-30PN uses an 80-pin shrink quad flat package (LQFP-PN) with 0.5 mm lead pitch, body size 14.0 mm × 14.0 mm, and height 1.4 mm. It complies with JEDEC MS-026 and features RoHS-compliant Cu/NiPdAu terminal finish. Thermal resistance θ_JA is 62°C/W, validated for operation up to 70°C ambient temperature.

Does the SN74ACT7882-30PN require external pull-up resistors on its status flag outputs?

No, the SN74ACT7882-30PN status flag outputs (AF/AE, HF, IR, OR) are push-pull, not open-drain. They drive actively high or low without external pull-ups. Each flag output can source –8 mA or sink +16 mA, making them directly compatible with standard 5-V TTL logic inputs and eliminating need for external biasing components.