Renesas 7205L12JG8

Overview

IDT7205L12JG8 from Integrated Device Technology is a 8,192 × 9-bit asynchronous CMOS FIFO memory buffer with 12 ns access time, dual-port architecture, and status flags (Empty, Full, Half-Full) for data flow control in rate-mismatched systems. It supports retransmit capability, simultaneous read/write, and industrial temperature operation (–40°C to +85°C) in a 32-pin PLCC package.

For engineers reviewing the IDT7205L12JG8 datasheet, IDT7205L12JG8 pinout, IDT7205L12JG8 application, or IDT7205L12JG8 equivalent, key selection criteria include its 12 ns access time, 9-bit data width with parity/control bit option, retransmit functionality, single-device or expandable depth/width configurations, and compatibility with legacy IDT720x family designs requiring deterministic latency and overflow/underflow protection.

Technical Context

The IDT7205L12JG8 implements a fully asynchronous dual-port FIFO using high-speed CMOS with independent write and read pointers, internal RAM array, and flag logic that prevents data loss via EF/FF assertion. Its 9-bit width supports user-configurable parity or control signaling, and it operates without clock synchronization between input and output domains.

It features dedicated control inputs-Write Enable (W), Read Enable (R), Reset (RS), Retransmit/First Load (FL/RT), and Expansion In (XI)-with defined timing relationships including tA = 12 ns, tRC = 20 ns, and tWPW = 12 ns. The device supports single-device mode (XI grounded) and depth expansion (XO→XI daisy-chain), though HF and RT are disabled in expansion modes.

Key Specifications

Pinout & Package

Package: 32-pin Plastic Leaded Chip Carrier (PLCC), J-lead, surface-mount, JEDEC MS-026AC compliant. Pin 1 index corner marked with notch or dot.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74V293-12PAG and ICS7205L12JG8, the IDT7205L12JG8 offers native PLCC mounting for vibration-prone industrial use, guaranteed 12 ns access under industrial temperature, and direct drop-in replacement for existing IDT720x designs without logic or layout changes.

Availability

IDT7205L12JG8 is available at Aetrix Electronics and suitable for industrial automation, telecom infrastructure, and embedded communications requiring stable component supply, long-lifecycle support, and verified performance across –40°C to +85°C.

Supply support for IDT7205L12JG8 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

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

The IDT7205L12JG8 belongs to the IDT720x family of asynchronous FIFOs designed specifically for deterministic, low-latency data buffering in mixed-clock-domain systems such as protocol bridges, DSP interfaces, and industrial controllers.

FAQ

What is the memory organization of the IDT7205L12JG8?

The IDT7205L12JG8 implements an 8,192 × 9-bit First-In/First-Out buffer, meaning it stores up to 8,192 words of 9-bit data. The ninth bit is user-assignable for parity checking or control signaling, and the device uses independent read/write pointers managed entirely in hardware without external clocking requirements.

Does the IDT7205L12JG8 support retransmit functionality, and how is it activated?

Yes, the IDT7205L12JG8 supports retransmit via the FL/RT pin. When FL/RT is pulsed LOW while R and W are HIGH, the internal read pointer resets to the first memory location without altering the write pointer. This enables repeat-read operations essential in serial protocol recovery and diagnostic data replay scenarios.

What are the operating voltage and temperature specifications for the IDT7205L12JG8?

The IDT7205L12JG8 operates from 4.5 V to 5.5 V DC and is rated for industrial temperature range (–40°C to +85°C). These specifications are validated per the datasheet's DC electrical characteristics table and apply to the J-lead PLCC package variant indicated by the "JG8" suffix.

How does the IDT7205L12JG8 handle full and empty conditions during read/write operations?

The IDT7205L12JG8 uses open-drain EF and FF flags to signal buffer state: EF goes LOW when read pointer equals write pointer (empty), blocking further reads; FF goes LOW when write pointer wraps to read pointer – 1 (full), blocking further writes. Both flags update synchronously with R/W edges and have defined propagation delays (e.g., tREF, tWFF) per AC timing tables.

Is the IDT7205L12JG8 pin-compatible with other members of the IDT720x family?

Yes, the IDT7205L12JG8 is pin- and functionally compatible across the IDT720x family (IDT7203–IDT7208) in the same package type. This allows seamless depth scaling-for example, replacing IDT7204L12JG8 with IDT7205L12JG8 requires no PCB change, only updated firmware assumptions about buffer size.