Infineon Technologies CY7C419-15VXCT

Overview

CY7C419-15VXCT from Cypress Semiconductor is a 256 × 9-bit asynchronous FIFO memory IC used for buffering data between mismatched clock domains or burst-to-continuous data streams. It operates at up to 33.3 MHz (15 ns access time), supports TTL-compatible I/O, features independent read/write enable control (R/W), and provides Empty (EF), Full (FF), and Half-Full (HF) status flags. It is commonly deployed in serial communication interfaces requiring flow control and data rate adaptation.

For engineers reviewing the CY7C419-15VXCT datasheet, CY7C419-15VXCT pinout, CY7C419-15VXCT application, or CY7C419-15VXCT equivalent, key selection criteria include its 256-word depth, 9-bit width, standalone retransmit capability, 5 V ±10% supply requirement, and PLCC-32/TQFP-32 package compatibility with legacy industrial bus systems.

Technical Context

This FIFO implements dual-ported RAM architecture with separate read and write address pointers, enabling true asynchronous operation-read and write cycles can occur concurrently without shared timing constraints. Its control logic uses active-low R and W strobes, with EF/FF/HF flags generated combinatorially from pointer comparison, ensuring deterministic flag assertion within specified propagation delays.

The device supports width expansion via three dedicated pins (XO, XI, XA), allowing parallel stacking of multiple CY7C419 units to increase data bus width beyond 9 bits. In depth expansion mode, the HF pin repurposes as expansion output (XO) to cascade control signals, preserving throughput by avoiding serial delay accumulation across devices.

Key Specifications

Pinout & Package

Package: 32-pin PLCC (Plastic Leaded Chip Carrier) with 11.43 mm × 11.43 mm body and 1.27 mm lead pitch. Also available in 32-pin TQFP (7 mm × 7 mm) and 28-pin DIP variants.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT7200LA15TPG and AM7200-15JC, CY7C419-15VXCT offers verified industrial temperature operation, lower operating current, and direct PLCC-32 footprint compatibility with legacy Cypress design libraries-making it preferable for long-lifecycle industrial upgrades.

Availability

CY7C419-15VXCT is available at Aetrix Electronics and suitable for industrial serial bridges, legacy bus data buffers, modem protocol retry engines, and multi-channel telemetry aggregators requiring stable component supply across extended product lifecycles.

Supply support for CY7C419-15VXCT 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 programmable system-on-chip, memory, and interface solutions for industrial, automotive, and communications markets.

CY7C419 belongs to Cypress's legacy asynchronous FIFO product line, designed specifically for deterministic data buffering in mixed-timing systems where clock domain isolation and hardware-based flow control are mandatory.

FAQ

What is the maximum data rate supported by CY7C419-15VXCT?

The CY7C419-15VXCT supports independent read and write operations at up to 33.3 MHz, corresponding to a minimum 30 ns cycle time. This enables sustained throughput of 33.3 million 9-bit words per second per port, limited only by external controller timing margins and PCB signal integrity.

Does CY7C419-15VXCT require external clock signals?

No-CY7C419-15VXCT is fully asynchronous and does not require clock inputs. Read and write operations are controlled solely by edge-triggered active-low R and W strobes, making it compatible with microcontrollers, CPLDs, and discrete logic without clock distribution networks.

Can CY7C419-15VXCT be used in depth-expanded configurations?

Yes-depth expansion is supported using the HF pin as expansion output (XO) to drive the XI pin of the next CY7C419 in chain. This configuration maintains full 33.3 MHz throughput because control signals propagate in parallel rather than serially, avoiding cumulative propagation delay.

Is the retransmit function available in all package types?

Yes-the retransmit (RT) functionality is implemented in silicon and available across all package variants (PLCC-32, TQFP-32, DIP-28). The RT pin is present and electrically identical regardless of package; only mechanical mounting and thermal characteristics differ.