Texas Instruments SN74V245-15PAGEP

Overview

SN74V245-15PAGEP from Texas Instruments is a radiation-tolerant, high-speed synchronous FIFO memory IC with 4096 × 18-bit depth-width organization, 7.5-ns read/write cycle time, 3.3-V supply with 5-V input tolerance, and dual timing modes (FWFT/standard) - deployed in DSP-to-processor communication, radar signal buffering, and avionics data acquisition systems.

For engineers reviewing the SN74V245-15PAGEP datasheet, SN74V245-15PAGEP pinout, SN74V245-15PAGEP application, or SN74V245-15PAGEP equivalent, key selection considerations include FWFT vs standard mode behavior, programmable almost-full/empty flag offsets, daisy-chain depth expansion capability, and military-grade –55°C to 125°C operation with controlled baseline traceability.

Technical Context

This is a synchronous, dual-clock FIFO with independent RCLK and WCLK domains supporting asynchronous or coincident clocking. It implements two fixed flags (EF/OR, FF/IR) and three programmable flags (PAE, PAF, HF), all updated on clock edges with configurable synchronization via FL/RXI/WXI pin states at reset.

The device uses high-performance submicron CMOS and supports depth expansion via WXO/RXO daisy-chaining and width expansion via parallel bus configuration. Its internal architecture includes separate read/write pointers, offset registers for flag thresholds, and output-enable-controlled 18-bit tri-state outputs - optimized for low-latency, deterministic data flow between TMS320 DSPs and analog front ends.

Key Specifications

Pinout & Package

Package: 64-pin Thin Quad Flat Package (TQFP, PAG), 10 mm × 10 mm, 0.5-mm pitch, exposed thermal pad - suitable for high-reliability PCB layouts with controlled impedance routing and thermal management.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72V245L15PF and SN74V293-15PGG, the SN74V245-15PAGEP uniquely combines military-grade environmental resilience, FWFT latency optimization, and fully programmable flag thresholds - making it the sole option for high-integrity, real-time embedded FIFO applications demanding guaranteed long-term supply and radiation tolerance.

Availability

SN74V245-15PAGEP is available at Aetrix Electronics and suitable for radar signal processing, avionics telemetry acquisition, and secure military communications requiring stable component supply across extended product lifecycles.

Supply support for SN74V245-15PAGEP 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 high-reliability components - with decades of heritage in defense, aerospace, and industrial-grade silicon.

The SN74V245-15PAGEP belongs to TI's DSP-Sync™ FIFO product line, engineered specifically to eliminate glue logic between TMS320 DSPs and peripheral interfaces while meeting stringent military environmental and traceability requirements.

FAQ

What is the maximum clock frequency supported by the SN74V245-15PAGEP?

The SN74V245-15PAGEP supports a maximum clock cycle frequency of 133 MHz, corresponding to a 7.5-ns read/write cycle time. This is verified under recommended operating conditions (VCC = 3.3 V, TJ = –55°C to 125°C) and confirmed in the timing requirements table of the SCAS932A datasheet. The device achieves this performance using high-speed submicron CMOS technology and is characterized for stable operation across its full military temperature range.

Does the SN74V245-15PAGEP support both FWFT and standard timing modes?

Yes, the SN74V245-15PAGEP supports both first-word fall-through (FWFT) and standard timing modes. Mode selection is determined at power-on reset by the logic states of FL, RXI, and WXI pins as defined in Table 6 of the datasheet. In FWFT mode, the first written word appears at Q0–Q17 after three RCLK transitions without requiring REN assertion; in standard mode, every read-including the first-requires explicit REN activation.

How are the programmable almost-full (PAF) and almost-empty (PAE) flags configured on the SN74V245-15PAGEP?

The SN74V245-15PAGEP configures PAF and PAE thresholds via 12-bit offset registers loaded using the LD pin and D0–D11 inputs on WCLK edges. Default offsets are 127 from full and empty respectively. Configuration occurs in standard mode only; FWFT mode disables offset register reads. Asynchronous or synchronous flag updates are selected via FL/RXI/WXI pin states at reset - with synchronous updates tied to WCLK (PAF) or RCLK (PAE).

Can multiple SN74V245-15PAGEP devices be connected for increased depth?

Yes, the SN74V245-15PAGEP supports daisy-chain depth expansion using WXO (write expansion out) and RXO (read expansion out) pins. In a chain, FL is grounded on the first device and high on subsequent devices; WXI and RXI of each downstream device connect to WXO and RXO of the upstream unit. This configuration scales total FIFO depth linearly - e.g., four devices yield 16,384 × 18-bit capacity - while preserving single-device timing behavior.

What is the purpose of the WXO/HF pin on the SN74V245-15PAGEP?

The WXO/HF pin on the SN74V245-15PAGEP serves dual functions: in single-device or width-expansion mode, it acts as a half-full flag (HF) that goes low when memory exceeds 50% capacity; in daisy-chain depth-expansion mode, it functions as write expansion out (WXO), sending a pulse to the next device's WXI pin upon writing to the last memory location. This dual-role design enables flexible system-level buffer monitoring or scalable depth architecture without additional pins.