Renesas 7201LA12SOG

Overview

7201LA12SOG from IDT (now Renesas Electronics) is a 512 × 9-bit asynchronous CMOS FIFO memory IC used for rate buffering and data synchronization between mismatched clock domains or bus protocols. It features 12 ns access time, 5 V supply operation, industrial temperature range (–40°C to +85°C), and dual-port first-in/first-out architecture with Empty, Full, and Half-Full status flags. It is commonly deployed in serial communications interfaces requiring parity bit support and retransmission capability.

For engineers reviewing the 7201LA12SOG datasheet, 7201LA12SOG pinout, 7201LA12SOG application, or 7201LA12SOG equivalent, key selection criteria include its 512-word depth, 9-bit data width with parity option, ultra-fast 12 ns access, auto-retransmit functionality, and compatibility with depth/width expansion schemes in embedded control and data acquisition systems.

Technical Context

The 7201LA12SOG implements an asynchronous dual-port FIFO using ring-pointer logic-no external address lines required-enabling independent read and write operations without shared timing constraints. Its internal 512 × 9 RAM array supports simultaneous read/write cycles with full flag (FF), empty flag (EF), and half-full flag (HF) for boundary condition management.

It features dedicated control inputs including Write Enable (W), Read Enable (R), Reset (RS), Retransmit (RT), and Expansion In (XI), with dual-function pins such as FL/RT and XO/HF enabling single-device or daisy-chained depth expansion modes. The device operates at 5 V ±10% and supports industrial temperature range per its SOG package marking.

Key Specifications

Pinout & Package

7201LA12SOG is packaged in a 28-pin SOIC (SO28-3) with gull-wing leads, marked "SOG" per IDT ordering nomenclature, indicating industrial temperature grade and green (Pb-free) finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 7201LA12SOG, the 7201LA15SOG trades 3 ns of speed for improved supply chain resilience, while the 7201L12SOG reduces thermal qualification to lower cost-neither alters pin compatibility or functional behavior in supported operating conditions.

Availability

7201LA12SOG is available at Aetrix Electronics and suitable for industrial serial interface buffering, military avionics data link buffering, and embedded test equipment data capture requiring stable component supply and long-term obsolescence management.

Supply support for 7201LA12SOG 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

IDT (Integrated Device Technology), now part of Renesas Electronics, is a fabless semiconductor company specializing in timing, memory interface, and high-performance interconnect solutions.

The IDT7200/7201/7202 family was designed specifically for asynchronous data buffering in multiprocessing, communications, and real-time control systems-emphasizing deterministic latency, hardware handshaking, and seamless expandability.

FAQ

What is the maximum operating frequency supported by the 7201LA12SOG?

The 7201LA12SOG does not operate on a fixed clock but supports asynchronous strobe-based operation. Its 12 ns access time enables effective data rates up to 83.3 MHz in flow-through mode. AC timing tables specify minimum read/write cycle times (e.g., t_RC = 20 ns min), allowing sustained throughput of ~50 MHz under typical loading. Actual system frequency depends on external control logic timing margins and PCB layout.

Does the 7201LA12SOG support parity checking?

Yes, the 7201LA12SOG supports parity checking through its 9-bit data path (D0–D8). Users may assign D8 as a parity bit for transmission/reception error detection in serial communications applications. The device itself does not generate or verify parity-it provides the extra bit width for system-level parity implementation, as confirmed in the Functional Description and Applications sections of the datasheet.

Can the 7201LA12SOG be used in depth expansion configurations?

Yes, the 7201LA12SOG supports depth expansion via its XI and XO/HF pins. In daisy-chain mode, XI connects to XO of the prior device, and FL/RT is grounded on the first device. However, the retransmit (RT) and half-full (HF) functions are disabled in depth expansion mode, and composite EF/FF flags require external OR logic. This configuration is fully documented in the Operating Modes section.

What is the purpose of the FL/RT pin on the 7201LA12SOG?

The FL/RT pin on the 7201LA12SOG is dual-function: in single-device mode (XI grounded), it serves as Retransmit (RT), resetting the read pointer to the start address upon a LOW pulse; in depth expansion mode (XI tied to prior XO), it acts as First Load (FL), identifying the initial device in the chain when grounded. Its role is determined solely by the XI pin state, as defined in the Signal Descriptions and Operating Modes sections.

Is the 7201LA12SOG RoHS compliant?

Yes, the "SOG" suffix in 7201LA12SOG indicates a green (Pb-free) finish per IDT's ordering nomenclature. The datasheet explicitly states "Green parts available" and references Pb-free compliance in the Ordering Information section. This version replaces legacy SnPb devices, which were discontinued as of June 15, 2018.