Infineon Technologies CY7C460A-10JC

Overview

CY7C460A-10JC from Cypress Semiconductor is an 8K × 9-bit asynchronous FIFO memory IC with 10 ns access time, 20 ns read/write cycle time, and 50 MHz maximum operation-designed for high-speed data buffering in serial-to-parallel conversion, protocol translation, and burst-mode interface bridging. It operates at 5V ±10%, supports standalone and cascaded depth/width expansion, and features Empty (EF), Full (FF), and Half Full (HF) flags plus Retransmit (RT) capability.

For engineers reviewing the CY7C460A-10JC datasheet, CY7C460A-10JC pinout, CY7C460A-10JC application, or CY7C460A-10JC equivalent, key selection criteria include its 8K-depth × 9-bit width architecture, TTL-compatible I/O, 3-state outputs, PLCC-28 package mapping, and functional equivalence to IDT7205 in asynchronous buffering systems requiring deterministic latency and flag-driven flow control.

Technical Context

The CY7C460A implements a dual-pointer asynchronous FIFO using static RAM core with independent read/write address generation logic. Its EF, FF, and HF flags are generated directly from pointer comparison without internal arbitration delay, enabling real-time buffer status monitoring. The Retransmit (RT) function allows deterministic packet retransmission by resetting the read pointer while preserving write pointer position.

Depth expansion uses token-passing via XI/XO signals between cascaded devices, eliminating external glue logic. Width expansion is achieved by tying corresponding D/Q pins across multiple devices with shared R/W/MR controls. All timing parameters-including tA (10 ns), tRC (20 ns), and tRTC (20 ns)-are guaranteed over commercial temperature range (0°C to +70°C) at VCC = 5V ±10%.

Key Specifications

Pinout & Package

Package: 28-pin Plastic Leaded Chip Carrier (PLCC-28), 350 mil × 350 mil body, J-lead, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT7205L15JG and SN74V293-10PAG, the CY7C460A-10JC delivers optimal balance of speed (50 MHz), 5V TTL compatibility, and proven interoperability in industrial serial infrastructure-making it the preferred choice for drop-in replacement in legacy buffering nodes.

Availability

CY7C460A-10JC is available at Aetrix Electronics and suitable for industrial serial bridges, FPGA-based video pipelines, legacy bus interposers, and protocol converter modules requiring stable component supply across extended product lifecycles.

Supply support for CY7C460A-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, automotive, and communications markets.

The CY7C460A belongs to Cypress's legacy asynchronous FIFO product line, designed specifically for deterministic, low-latency data buffering in mixed-signal and real-time embedded systems where clock domain isolation and flag-driven control are essential.

FAQ

What is the maximum operating frequency for read and write operations on the CY7C460A-10JC?

The CY7C460A-10JC supports independent 50 MHz read and write operations, verified by its 20 ns read/write cycle time (tRC/tWC) and 10 ns access time (tA). This performance is guaranteed over the commercial temperature range (0°C to +70°C) with VCC = 5V ±10%, and does not degrade with FIFO fill level due to its asynchronous dual-pointer architecture.

How does the Retransmit (RT) function operate, and what conditions must be met to activate it?

The Retransmit function is activated by pulling the FL/RT pin LOW while both R and W are held HIGH; this resets the read pointer to the beginning of the FIFO without affecting the write pointer. It is valid only in standalone or width-expansion modes-not in depth-cascaded configurations-and requires tRPW/tWPW setup before MR assertion to maintain pointer integrity.

Can the CY7C460A-10JC be used in depth-expansion configurations, and how is chaining implemented?

Yes-depth expansion is implemented using the XI (Expansion In) and XO/HF (Expansion Out) pins. The XO output of one device connects to the XI input of the next, enabling token-passing control of read/write enable propagation. Up to 256 devices can be chained, with each stage adding 8K words, and all devices sharing common R, W, and MR signals.

What are the absolute maximum ratings for supply voltage and operating temperature of the CY7C460A-10JC?

The CY7C460A-10JC has an absolute maximum supply voltage of –0.5 V to +7.0 V and a storage temperature range of –65°C to +150°C. Its rated operating ambient temperature is 0°C to +70°C (commercial grade), with VCC = 5V ±10%. Exceeding these limits risks permanent damage to the CMOS RAM array or I/O buffers, per Cypress Document #38-06011 Rev. *A.