Infineon Technologies CY7C4231V-15JXC

Overview

CY7C4231V-15JXC from Cypress Semiconductor is a 2K × 9-bit synchronous FIFO memory with 3.3 V operation, 66 MHz max clock frequency (15 ns cycle time), 5 V-tolerant inputs, and programmable Almost Empty/Almost Full flags. It serves as a high-speed data buffer in multi-processor interconnects and serial communication interfaces requiring deterministic latency and asynchronous read/write isolation.

For engineers reviewing the CY7C4231V-15JXC datasheet, CY7C4231V-15JXC pinout, CY7C4231V-15JXC application, or CY7C4231V-15JXC equivalent, key selection criteria include synchronous flag timing alignment (RCLK/WCLK domain separation), 9-bit bus width compatibility, programmable flag offset register access via WEN2/LD, and TQFP-32 package thermal and routing constraints.

Technical Context

The CY7C4231V-15JXC implements a dual-clock, 2048-word × 9-bit SRAM-based FIFO with independent read (RCLK/REN1/REN2) and write (WCLK/WEN1/WEN2/LD) control paths. Its status flags-EF, FF, PAE, PAF-are strictly synchronized: EF and PAE update on RCLK edges; FF and PAF update on WCLK edges.

Flag offsets are stored in four 8-bit registers (Empty LSB/MSB, Full LSB/MSB), defaulting to 7 (007h), and accessed via WEN2/LD low during reset. The device supports width expansion by parallelizing multiple units while sharing clock/enable signals and generating composite EF/FF logic.

Key Specifications

Pinout & Package

Package: 32-pin Thin Quad Flat Package (TQFP), 7 mm × 7 mm body, 0.5 mm lead pitch, RoHS-compliant Pb-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72V2115L15PF and SN74V293-15PAG, the CY7C4231V-15JXC uniquely supports both dual-clock domain operation and in-band flag offset programming via WEN2/LD-critical for adaptive flow control in heterogeneous SoC interconnects.

Availability

CY7C4231V-15JXC is available at Aetrix Electronics and suitable for industrial serial bridges, multi-processor data exchange, PCI Express sideband buffering, and high-speed test equipment interfaces requiring stable component supply and long-term obsolescence management.

Supply support for CY7C4231V-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

Cypress Semiconductor (now part of Infineon Technologies) is a fabless semiconductor company specializing in high-performance memory, microcontrollers, and programmable logic solutions for industrial, automotive, and communications markets.

The CY7C42X1V family was designed specifically for high-speed, low-latency data buffering in mixed-voltage, multi-clock-domain systems-emphasizing synchronous flag reliability, 5 V-tolerant interfacing, and field-programmable buffer thresholds.

FAQ

What is the required power-up sequence for CY7C4231V-15JXC?

A valid reset pulse on the RS pin is mandatory after VCC reaches 3.3 V stability. The RS pulse must be a HIGH-going edge lasting ≥10 ns, followed by ≥100 ns of RS HIGH before any read/write activity. Failure to reset results in undefined flag states and potential data corruption during initial access.

How do I configure the Almost Empty flag offset?

Hold WEN2/LD LOW during RS assertion to enter flag programming mode. Then apply four consecutive WCLK rising edges while WEN1 and WEN2/LD remain LOW: the first writes to Empty LSB, second to Empty MSB, third to Full LSB, fourth to Full MSB. Default value is 007h (7 decimal) for both.

Can RCLK and WCLK be operated at different frequencies?

Yes-RCLK and WCLK are fully independent and may run at different frequencies (e.g., RCLK = 40 MHz, WCLK = 66 MHz). Flag updates remain domain-specific: EF/PAE update only on RCLK edges; FF/PAF update only on WCLK edges. No phase alignment is required.

Is CY7C4231V-15JXC compatible with 5 V logic outputs driving its inputs?

Yes-all input pins (D0–D8, WCLK, RCLK, WEN1, WEN2/LD, REN1, REN2, RS, OE) tolerate up to 5.5 V, verified per datasheet VIH(max) = 5 V. No external level shifters are needed when interfacing with 5 V CMOS/TTL drivers.