Renesas 7205L12JG

Overview

IDT7205L12JG from Integrated Device Technology is a 8,192 × 9-bit asynchronous CMOS FIFO memory buffer with 12 ns access time, dual-port operation, and status flags (Empty, Full, Half-Full) for real-time flow control in data rate-matching applications such as UART bridging and video frame buffering.

For engineers reviewing the IDT7205L12JG datasheet, IDT7205L12JG pinout, IDT7205L12JG application, or IDT7205L12JG equivalent, key selection criteria include its 12 ns access time, 5 V single-supply operation, PLCC-32 package, retransmit capability, and compatibility with industrial temperature range (–40°C to +85°C) systems requiring deterministic latency and overflow/underflow protection.

Technical Context

The IDT7205L12JG implements a fully asynchronous dual-port architecture with independent read/write clocks, internal pointer logic, and three-state output buffers. It supports single-device mode (via grounded XI), width expansion (parallel devices), and depth expansion (daisy-chained via XO/XI), with all modes governed by discrete control signals (W, R, RS, FL/RT).

Status flag generation is synchronous to control edges: EF asserts on read of last word, FF asserts on write to last location, and HF toggles at half-capacity in single-device mode. Retransmit (RT) resets only the read pointer without affecting write pointer or data integrity - a feature critical for packet replay in protocol stacks.

Key Specifications

Pinout & Package

Package: 32-lead Plastic Leaded Chip Carrier (PLCC), JEDEC MS-026, body size 13.97 mm × 13.97 mm, gull-wing leads, lead finish SnPb (EOL, last-time-buy expired June 2018).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74V293-12PAG and IDT7205L15JG, the IDT7205L12JG uniquely delivers 12 ns access time in a 5 V industrial PLCC package with integrated retransmit and half-full flag - making it irreplaceable in legacy 5 V systems demanding deterministic sub-20 ns latency and hardware replay.

Availability

IDT7205L12JG is available at Aetrix Electronics and suitable for UART bridging, video frame buffering, protocol stack replay, and industrial PLC I/O buffering requiring stable component supply across extended product lifecycles.

Supply support for IDT7205L12JG 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 IDT7200 family was designed specifically for high-reliability, low-latency data buffering in industrial, military, and telecommunications equipment where deterministic asynchronous operation and hardware flow control are mandatory.

FAQ

What is the maximum operating frequency supported by the IDT7205L12JG?

The IDT7205L12JG supports a maximum shift frequency of 50 MHz, derived from its 12 ns access time specification. This allows reliable data transfer at 50 million words per second in flow-through mode, provided setup/hold times (t_DS = 9 ns, t_DH = 0 ns) and cycle timing (t_WC = 20 ns min) are met. The device does not require an external clock; timing is controlled entirely by W and R pulse widths and spacing.

Does the IDT7205L12JG support 3.3 V operation?

No, the IDT7205L12JG is specified only for 4.5 V to 5.5 V operation per its DC electrical characteristics table. Attempting 3.3 V supply will result in undefined logic thresholds, increased access time, and potential failure to assert EF/FF flags correctly. For 3.3 V systems, consider the pin-incompatible SN74V293 series or IDT72V2111 family.

How does the retransmit (RT) function behave during depth expansion mode?

The retransmit (RT) function is explicitly disabled in depth expansion mode per the datasheet's Operating Modes section. When XI is driven by XO of a prior device (not grounded), the FL/RT pin operates solely as First Load (FL) for the first device in the chain and is ignored in subsequent devices. Therefore, IDT7205L12JG cannot perform retransmit in daisy-chained configurations - only in single-device or width-expanded setups.

What is the purpose of the XO/HF pin in single-device mode?

In single-device mode (XI grounded), the XO/HF pin functions exclusively as the Half-Full Flag (HF). It goes LOW when exactly 4,096 words (half of 8,192) have been written, and remains LOW until the difference between write and read pointers falls to ≤4,096. This provides early warning of near-full condition, enabling proactive data consumption before FF asserts - critical for jitter-sensitive streaming applications.

Is the IDT7205L12JG RoHS-compliant?

The IDT7205L12JG uses SnPb lead finish and was manufactured prior to full RoHS transition; it is not RoHS-compliant. Its ordering information confirms "LEAD FINISH (SnPb) ARE IN EOL PROCESS" with last-time-buy expired June 2018. For RoHS-compliant alternatives, consult Renesas' current-generation FIFO portfolio or consider drop-in replacements like the IDT72V2111 series with green packaging options.