Infineon Technologies CY7C4201V-15AXCT

Overview

CY7C4201V-15AXCT from Cypress Semiconductor is a 256 × 9-bit synchronous FIFO memory IC with 3.3 V operation, 66 MHz maximum clock frequency (15 ns cycle time), 20 mA active supply current, and 5 V-tolerant inputs. It implements dual-clock asynchronous read/write buffering with programmable Almost Empty/Almost Full flags and supports width expansion in communication interfaces and high-speed data acquisition systems.

For engineers reviewing the CY7C4201V-15AXCT datasheet, CY7C4201V-15AXCT pinout, CY7C4201V-15AXCT application, or CY7C4201V-15AXCT equivalent, key selection criteria include synchronous flag timing alignment to RCLK/WCLK, programmable offset register access via WEN2/LD, 9-bit bus width, TQFP-32 package compatibility, and 3.3 V / 5 V I/O tolerance for mixed-voltage system integration.

Technical Context

The CY7C4201V-15AXCT uses a dual-port SRAM array with independent read and write pointers synchronized to RCLK and WCLK respectively. Its four status flags-EF, FF, PAE, PAF-are fully synchronous: 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 are accessed by holding WEN2/LD LOW at reset. The device supports both single-clock (RCLK = WCLK) and true asynchronous dual-clock operation with independent enable logic (WEN1/WEN2, REN1/REN2).

Key Specifications

Pinout & Package

Package: 32-pin TQFP (7 mm × 7 mm), lead-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT7203L15JG and SN74V293-15PAG, the CY7C4201V-15AXCT uniquely integrates pin-controlled flag offset programming, 5 V-tolerant inputs, and center-ground layout - making it optimal for mixed-signal test gear and industrial protocol bridges requiring robust voltage interoperability and fine-grained flow control.

Availability

CY7C4201V-15AXCT is available at Aetrix Electronics and suitable for high-speed data acquisition, multiprocessor interconnect, and communications protocol bridging requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for CY7C4201V-15AXCT 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) designs high-performance mixed-signal ICs for embedded control, connectivity, and memory applications, with global manufacturing and support infrastructure.

The CY7C42X1V series was developed specifically for synchronous buffering in clock-domain-crossing scenarios - emphasizing deterministic flag timing, low-power 3.3 V operation, and flexible configuration for test, telecom, and industrial control systems.

FAQ

What is the function of the WEN2/LD pin, and how does its behavior change at reset?

WEN2/LD is a dual-function pin whose mode is determined at reset: if held HIGH during RS assertion, it acts as a second write enable; if held LOW, it becomes the Load enable for accessing the four 8-bit flag offset registers. This configuration is latched and cannot be changed without power cycling or hardware reset.

How are the Almost Empty and Almost Full flags synchronized, and why does this matter for system design?

PAE and EF update synchronously to RCLK edges; PAF and FF update synchronously to WCLK edges. This guarantees one-cycle stability of flag states relative to their controlling clock domain, eliminating metastability and enabling reliable handshaking without external synchronizers in cross-clock-domain interfaces.

Can the CY7C4201V-15AXCT operate with a single clock, and what are the implications for control pin usage?

Yes - RCLK and WCLK may be tied together for single-clock operation. In this mode, REN1/REN2 and WEN1/WEN2 remain independently controllable, allowing gated read/write bursts. However, flag timing remains split: EF/PAE still track RCLK, FF/PAF track WCLK, so both clocks must be active even when identical.

What is the minimum setup/hold timing required for WEN1 and WEN2/LD relative to WCLK, and where is this specified?

WEN1 and WEN2/LD must meet tENS = 4 ns setup and tENH = 1 ns hold time before the rising edge of WCLK, as defined in the Selection Guide on page 4 of datasheet 38-06010 Rev. *I. Violating these violates the write enable window and may cause invalid or missed writes.