Infineon Technologies CY7C4231V-25AXC

Overview

CY7C4231V-25AXC from Cypress Semiconductor is a 2K × 9-bit synchronous FIFO memory with 3.3 V operation, 66 MHz max clock frequency (25 ns cycle time), programmable Almost Empty/Almost Full flags, and dual-clock asynchronous read/write capability. It serves as a high-speed data buffer in multi-processor interconnects and communications interfaces requiring deterministic latency and depth expansion support.

For engineers reviewing the CY7C4231V-25AXC datasheet, CY7C4231V-25AXC pinout, CY7C4231V-25AXC application, or CY7C4231V-25AXC equivalent, key selection criteria include synchronous flag timing alignment (RCLK/WCLK domain separation), 9-bit bus width compatibility, 2K depth requirement for burst buffering, and 32-pin TQFP footprint constraints in space-constrained PCB layouts.

Technical Context

The CY7C4231V-25AXC implements a dual-port SRAM array (2048 × 9 bits) with independent read and write pointer logic, synchronized status flags (EF/FF updated on RCLK/WCLK edges respectively), and programmable offset registers for PAE/PAF thresholds. Its architecture supports both single-clock (RCLK = WCLK) and fully asynchronous operation.

Flag programming uses WEN2/LD in load mode during reset to access four 8-bit offset registers (empty LSB/MSB, full LSB/MSB); default offsets are 7 words for both Almost Empty and Almost Full. The device features 5V-tolerant inputs (VIH max = 5 V), center power/ground pins for noise reduction, and OE-controlled three-state outputs.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72V2113L15PF and NB3N502M, the CY7C4231V-25AXC uniquely combines programmable flag offsets, dual-write-enable depth expansion, and 5V-tolerant inputs-making it optimal for adaptable, multi-device buffering architectures where interface voltage mixing and dynamic watermark tuning are required.

Availability

CY7C4231V-25AXC is available at Aetrix Electronics and suitable for high-speed data acquisition systems, multi-processor interconnects, and industrial protocol bridges requiring stable component supply across extended production lifecycles.

Supply support for CY7C4231V-25AXC 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, PSoC programmable system-on-chip, and USB/USB-C solutions.

The CY7C42X1V series was designed specifically for deterministic, low-latency data buffering in mixed-signal and real-time embedded systems where clock domain isolation and configurable flow control are critical.

FAQ

What is the default Almost Empty and Almost Full offset value for CY7C4231V-25AXC?

The default offset values are 7 words for both Almost Empty and Almost Full flags. These values are stored in the internal 8-bit offset registers and take effect after power-up reset unless reprogrammed via WEN2/LD and WCLK/RCLK sequences. The device enters this state automatically without external configuration.

Can CY7C4231V-25AXC operate with a single clock for both read and write functions?

Yes. RCLK and WCLK pins may be tied together to implement single-clock synchronous FIFO operation. In this mode, read and write operations are time-multiplexed on the same clock edge, and flag updates remain synchronized to that shared clock domain-EF/PAE on rising edge, FF/PAF on same rising edge.

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

WEN2/LD is sampled during the RS (reset) pulse. If held HIGH during reset, it configures the device for dual-write-enable mode (supporting depth expansion). If held LOW, it enables flag offset register programming mode. This configuration is latched and remains fixed until next reset.

Is CY7C4231V-25AXC compatible with 5 V logic families without level shifters?

Yes. All input pins (including WCLK, RCLK, WEN1, WEN2/LD, REN1, REN2, RS, OE) tolerate up to 5.5 V, meeting the VIH max = 5 V specification. This allows direct connection to TTL, LVTTL, and 5 V CMOS outputs without external translation circuitry.