Infineon Technologies CY7C4251-10JXC

Overview

CY7C4251-10JXC from Cypress Semiconductor is an 8K × 9-bit synchronous FIFO memory with TTL-compatible interfaces, 10 ns read/write cycle time, 100 MHz clock operation, and programmable Almost Empty/Almost Full flags. It supports independent read/write clocks, dual write-enable configuration, and operates at 35 mA ICC in commercial temperature range - deployed in high-speed data acquisition and multiprocessor interconnect buffering.

For engineers reviewing the CY7C4251-10JXC datasheet, CY7C4251-10JXC pinout, CY7C4251-10JXC application, or CY7C4251-10JXC equivalent, key selection criteria include synchronous flag timing (RCLK/WCLK-synchronized), programmable offset granularity (1-word resolution), width-expansion capability, and TQFP-32 package compatibility with IDT722X1-series devices.

Technical Context

The CY7C4251-10JXC implements a dual-port SRAM-based FIFO architecture with separate 9-bit input (D0–D8) and output (Q0–Q8) buses, controlled by asynchronous RCLK and WCLK signals. Its status logic generates EF, FF, PAE, and PAF flags synchronized strictly to RCLK (EF, PAE) or WCLK (FF, PAF), ensuring deterministic timing behavior across clock domains.

Flag offsets are stored in four 8-bit registers (Empty LSB/MSB, Full LSB/MSB), defaulting to 007h (7 words), and configurable via WEN2/LD in Load mode using sequential WCLK transitions. The device resets to empty state on RS assertion, with tRSF-specified flag validity and Q-output initialization.

Key Specifications

Pinout & Package

Package: 32-pin TQFP (7 mm × 7 mm), lead-free, center power/ground pins for noise reduction.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72241L10PFI, CY7C4251-10JXC offers integrated flag programming via WEN2/LD, reducing external component count; versus NB3N502M, it delivers higher depth and TTL compatibility essential for legacy system integration.

Availability

CY7C4251-10JXC is available at Aetrix Electronics and suitable for high-speed data acquisition, multiprocessor interconnect, and communications protocol buffering requiring stable component supply and long-term lifecycle support.

Supply support for CY7C4251-10JXC 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 fabless semiconductor company specializing in programmable system-on-chip solutions, memory, and interface ICs for industrial, automotive, and consumer applications.

The CY7C42X1 FIFO product line was engineered for deterministic, low-latency data buffering in mixed-clock-domain systems - targeting applications where jitter-free flag timing and seamless width/depth scalability are critical.

FAQ

What is the default Almost Empty offset value for CY7C4251-10JXC?

The default Almost Empty offset is 007h (7 words), stored across the Empty LSB and MSB registers. This value is factory-programmed and active immediately after reset unless overwritten via WEN2/LD Load mode using sequential WCLK transitions with WEN1 and WEN2/LD both LOW.

Can CY7C4251-10JXC operate with a single clock for both read and write?

Yes - RCLK and WCLK pins may be tied together for single-clock operation. In this mode, the device functions as a standard synchronous FIFO with all timing referenced to that common clock, retaining full flag functionality and programmability without modification.

How does the WEN2/LD pin determine FIFO configuration at power-up?

At reset (RS active), the logic state of WEN2/LD determines mode: HIGH configures dual write-enable for depth expansion; LOW enables Load mode for flag offset register access. This configuration is latched and remains fixed until next reset - no runtime reconfiguration is supported.

Is CY7C4251-10JXC RoHS compliant and lead-free?

Yes - the "JXC" suffix denotes a lead-free, RoHS-compliant 32-pin TQFP package. Cypress confirmed Pb-free construction per JEDEC J-STD-609, with SnAgCu solder finish and halogen-free molding compound, meeting IPC/JEDEC J-STD-020 moisture sensitivity level 3.