Infineon Technologies CY7C466A-10JC

Overview

CY7C466A-10JC from Cypress Semiconductor is a 64K × 9-bit asynchronous FIFO memory with 10 ns access time, 20 ns read/write cycle time, and 50 MHz independent read/write capability. It operates at 5V ±10%, provides Empty/Full/Half Full flags, Retransmit functionality, and supports depth/width expansion in industrial temperature range (–40°C to +85°C). Used in high-speed data buffering between mismatched bus domains in telecom line cards.

For engineers reviewing the CY7C466A-10JC datasheet, CY7C466A-10JC pinout, CY7C466A-10JC application, or CY7C466A-10JC equivalent, key selection criteria include asynchronous dual-clock operation, 64K-depth buffering, TTL-compatible I/O, cascading support via XI/XO, and retransmit capability for packetized data recovery.

Technical Context

The CY7C466A implements a true first-in-first-out architecture using Cypress's 0.5 µm RAM3 CMOS process, with independent read and write pointers enabling concurrent 50 MHz operations regardless of FIFO depth. It features dedicated flag logic for EF, FF, and XO/HF outputs, plus MR-controlled reset synchronization.

Retransmit (RT) is active only in standalone or width-expansion modes and requires R and W both HIGH during RT assertion; data is re-read from the current read pointer position. Expansion uses token-passing via XI/XO pins, where XO of one device drives XI of the next to coordinate depth chaining without external arbitration logic.

Key Specifications

Pinout & Package

Package: 44-pin PLCC (Plastic Leaded Chip Carrier), 300-mil body, JEDEC MS-026AC compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT7208L10PA and SN74V293-10PAG, the CY7C466A-10JC offers native 5V operation without translation, proven industrial temperature reliability, and simpler flag logic-making it optimal for cost-sensitive, legacy 5V telecom and industrial control systems where feature extension is unnecessary.

Availability

CY7C466A-10JC is available at Aetrix Electronics and suitable for telecom line card buffering, industrial PLC data aggregation, and medical imaging data pipelines requiring stable component supply across extended product lifecycles.

Supply support for CY7C466A-10JC 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

Cypress Semiconductor (now part of Infineon Technologies) is a U.S.-based semiconductor company specializing in high-performance memory, PSoC, and interface solutions for industrial and communications markets.

The CY7C46X family was designed specifically for high-speed, low-latency data buffering in legacy 5V systems requiring deterministic asynchronous operation and seamless expandability-targeting telecom infrastructure, test equipment, and factory automation.

FAQ

What is the maximum operating frequency for independent read and write operations?

The CY7C466A-10JC supports up to 50 MHz for both read and write operations independently, verified by its 20 ns read/write cycle time and 10 ns access time. This performance holds across the full industrial temperature range (–40°C to +85°C) and does not degrade with FIFO fill level or expansion configuration.

How does the Retransmit (RT) function operate in standalone mode?

In standalone mode, asserting FL/RT LOW while keeping R and W HIGH initiates retransmission: the FIFO re-presents data starting from the current read pointer position without advancing it. Subsequent R pulses then output the same data sequence, enabling hardware-level packet resend without CPU involvement or pointer manipulation.

Can CY7C466A-10JC be used in depth-expansion configurations without external logic?

Yes-depth expansion uses native XI (Expansion In) and XO/HF (Expansion Out) pins with token-passing protocol. When XO of Device 1 goes LOW, it drives XI of Device 2, enabling automatic activation of the next FIFO in chain. No external counters, state machines, or glue logic are required for basic cascading.

What is the electrical behavior of the EF, FF, and XO/HF outputs?

All three flags are open-drain outputs with internal pull-ups disabled; they require external 4.7 kΩ pull-up resistors to VCC. EF and FF drive LOW to indicate active states (empty/full), while XO/HF drives LOW for Half Full in standalone mode or Expansion Out signaling in depth mode-verified in the AC switching waveforms on pages 6–7 of datasheet 38-06011 Rev. *A.