Infineon Technologies CY7C464A-15JC

Overview

CY7C464A-15JC from Cypress Semiconductor is a 32K × 9-bit asynchronous FIFO memory with 15 ns access time, 20 ns read/write cycle time, and 50 MHz independent read/write capability. It operates at 5V ±10%, supports standalone and cascaded depth/width expansion, and delivers TTL-compatible three-state outputs for data buffering in high-speed serial interface bridges and protocol translation systems.

For engineers reviewing the CY7C464A-15JC datasheet, CY7C464A-15JC pinout, CY7C464A-15JC application, or CY7C464A-15JC equivalent, key selection considerations include its 32K-depth buffer capacity, dual-flag control (EF/FF/HF), retransmit (RT) support for packet recovery, and PLCC-28 package compatibility with legacy industrial controllers.

Technical Context

The CY7C464A-15JC implements a fully asynchronous dual-port architecture with independent read and write address pointers, enabling concurrent data ingestion and egress without clock domain synchronization. Its flag logic generates EF (Empty), FF (Full), and HF (Half Full) signals with deterministic propagation delays-tREF = 10–25 ns, tWFF = 10–25 ns-ensuring reliable handshaking in burst-mode interfaces.

It supports cascading via XI (Expansion In) and XO/HF (Expansion Out / Half Full) pins, allowing unlimited depth expansion through token-steered control signal chaining. Retransmit (FL/RT) functionality enables packet-level data replay upon receiver acknowledgment failure, requiring R and W to remain HIGH during RT assertion.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT7207L15JGI and SN74V293-15PAG, the CY7C464A-15JC uniquely supports 5V operation, PLCC-28 drop-in replacement in legacy systems, and hardware-assisted retransmit-making it irreplaceable for industrial retrofit projects requiring zero firmware changes.

Availability

CY7C464A-15JC is available at Aetrix Electronics and suitable for industrial serial interface bridges, protocol translation buffers, legacy microcontroller bus extenders, and packet-based sensor aggregators requiring stable component supply across extended product lifecycles.

Supply support for CY7C464A-15JC 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 founded in 1982, specializing in programmable system-on-chip (PSoC), memory, and interface solutions for industrial, automotive, and consumer markets.

The CY7C46X series was designed specifically for high-reliability, asynchronous data buffering in legacy 5V systems-emphasizing pin compatibility, wide temperature operation, and hardware-controlled flow management over power efficiency or density scaling.

FAQ

What is the maximum operating frequency for independent read and write operations on CY7C464A-15JC?

The CY7C464A-15JC supports up to 50 MHz for both read and write operations independently, verified by tRC = 20 ns and tWC = 20 ns minimum cycle times across the commercial (0°C to +70°C) and industrial (–40°C to +85°C) temperature ranges. This performance holds regardless of FIFO fill level or expansion configuration.

How does the Retransmit (FL/RT) function operate, and what are its timing requirements?

When FL/RT is pulled LOW in standalone mode, the FIFO retransmits all stored data starting from the oldest word, with R and W held HIGH during the entire cycle. The retransmit pulse width (tPRT) is 10–25 ns, and the full cycle (tRTC) is 20–35 ns. Outputs Q0–Q8 become valid tLZR = 3 ns after R goes LOW during retransmit.

Can CY7C464A-15JC be used in depth-cascaded configurations, and how is flag behavior affected?

Yes-depth cascading uses XI and XO/HF pins to chain multiple CY7C464A-15JC devices. In this mode, the XO/HF pin functions as Expansion Out (XO), not Half Full, and drives the XI pin of the next device. The EF and FF flags remain local to each device, while HF functionality is disabled; only the master device provides HF in width-expansion mode.

What is the power consumption profile during active and standby operation?

In active operation at 20 MHz with all outputs loaded, ICC = 60 mA (typical) at VCC = 5 V. In standby mode with all inputs at VIH min., ISB = 8 mA (typical). These values are specified across the full industrial temperature range and include margin for worst-case process variation per datasheet Electrical Characteristics table.