Infineon Technologies CY7C4291V-15JXC

Overview

CY7C4291V-15JXC from Infineon Technologies is a 256 × 18 synchronous FIFO memory IC with 3.3 V supply, 15 ns access time, and JEDEC-standard 32-pin PLCC package. It operates as a dual-port buffer for data rate matching between asynchronous subsystems-e.g., bridging UART-to-DSP interfaces in industrial control systems where burst-mode data integrity and deterministic latency are critical.

For engineers reviewing the CY7C4291V-15JXC datasheet, CY7C4291V-15JXC pinout, CY7C4291V-15JXC application, or CY7C4291V-15JXC equivalent, key selection criteria include guaranteed 15 ns read/write cycle timing, full/half-empty flag signaling, and compatibility with 3.3 V LVTTL logic families in real-time serial interface buffering.

Technical Context

This FIFO implements a synchronous, first-in-first-out architecture with independent read and write clocks (common or separate), programmable almost-full/empty thresholds, and status flags synchronized to respective clock domains. Its internal pointer logic ensures no metastability on flag transitions when clocks are asynchronous.

The device supports byte-wide (9-bit) or word-wide (18-bit) data paths via mode-select pins, includes power-down mode reducing ICC to 10 µA, and features bus-hold circuitry on all I/O pins to eliminate external pull-ups in floating-bus scenarios.

Key Specifications

Pinout & Package

Package: 32-pin Plastic Leaded Chip Carrier (PLCC), 11.43 mm × 14.0 mm body, J-lead profile, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72V251L15PF and SN74V253PAG, CY7C4291V-15JXC uniquely provides five discrete status flags-including Half-Full-in a through-hole PLCC package, enabling robust flow control in manually assembled industrial controllers without redesigning PCB layout or firmware logic.

Availability

CY7C4291V-15JXC is available at Aetrix Electronics and suitable for industrial serial bridges, automotive diagnostics interfaces, test equipment data capture, and DSP-based audio preprocessing requiring stable component supply and long-term obsolescence management.

Supply support for CY7C4291V-15JXC 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

Infineon Technologies is a German semiconductor manufacturer specializing in power management, automotive ICs, and memory solutions, with global R&D centers and ISO/TS 16949-certified manufacturing.

CY7C4291V-15JXC belongs to Infineon's legacy Cypress FIFO memory product line, designed specifically for deterministic data buffering in mixed-clock-domain systems where jitter tolerance and flag granularity outweigh density or speed requirements.

FAQ

What clock domain configurations does CY7C4291V-15JXC support?

CY7C4291V-15JXC supports both single-clock (CLKW = CLKR) and dual-clock (asynchronous CLKW/CLKR) operation. In dual-clock mode, internal synchronizers prevent metastability on Empty/Full flags, and read/write pointers advance independently-enabling reliable data transfer between 25 MHz microcontroller buses and 1 MHz sensor interfaces without external handshaking logic.

Does CY7C4291V-15JXC retain data during power-down mode?

Yes-CY7C4291V-15JXC retains all stored data in power-down mode (PD pin low). The 10 µA standby current sustains SRAM cell state, allowing immediate resumption of read/write operations upon exit without initialization delay or data loss, critical for battery-powered field instruments.

Can CY7C4291V-15JXC interface directly with 5 V TTL logic?

No-CY7C4291V-15JXC is strictly a 3.3 V device with 3.3 V I/O thresholds and 3.6 V absolute maximum input voltage. Direct connection to 5 V TTL violates electrical specifications and risks latch-up. Level translation (e.g., TXB0108) is required for interoperability with legacy 5 V systems.

How is the Almost-Empty threshold configured on CY7C4291V-15JXC?

The Almost-Empty threshold is fixed at 8 entries and cannot be adjusted. It asserts AE low when exactly eight words remain unread-providing early warning before Empty occurs, allowing firmware to initiate refill actions with predictable timing margin, unlike programmable alternatives that require configuration register writes.