Infineon Technologies CY7C4201-15JXCT

Overview

CY7C4201-15JXCT from Cypress Semiconductor is a 256 × 9-bit synchronous FIFO memory with clocked read/write interfaces, programmable Almost Empty/Almost Full flags, and independent RCLK/WCLK operation. It operates at up to 66.7 MHz (15 ns cycle time), draws 35 mA ICC, supports TTL-compatible I/O, and is housed in a 32-pin TQFP (7 mm × 7 mm) package. It serves as a high-speed data buffer in multiprocessor interconnects and serial communication gateways.

For engineers reviewing the CY7C4201-15JXCT datasheet, CY7C4201-15JXCT pinout, CY7C4201-15JXCT application, or CY7C4201-15JXCT equivalent, key selection criteria include its 256-word depth, dual write-enable configuration (WEN1/WEN2/LD), synchronous flag timing (RCLK-synchronized EF/PAE, WCLK-synchronized FF/PAF), output enable (OE) control, and width-expansion capability for system-level buffering.

Technical Context

The CY7C4201-15JXCT implements a dual-port SRAM array (256 × 9) with separate read and write pointer logic, reset-controlled initialization, and synchronous flag generation. Its architecture supports simultaneous read/write via independent RCLK and WCLK domains, with EF and PAE updated on RCLK edges and FF and PAF on WCLK edges.

Flag programmability is enabled through four 8-bit offset registers accessed via WEN2/LD in Load mode; default offsets are 007h for both Almost Empty and Almost Full. The device uses 0.65 µm CMOS technology, features center VCC/GND pins for noise reduction, and provides three-state outputs via OE.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72201L15PF and MC100E131FN, the CY7C4201-15JXCT uniquely balances TTL compatibility, programmable flow control, and moderate power - making it optimal for industrial controllers and mixed-signal embedded systems requiring robust, adaptable buffering.

Availability

CY7C4201-15JXCT is available at Aetrix Electronics and suitable for industrial serial gateways, multiprocessor data bridges, and PCI Express endpoint buffering requiring stable component supply across extended production lifecycles.

Supply support for CY7C4201-15JXCT 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 memory and programmable logic solutions for industrial, automotive, and communications markets.

The CY7C42X1 family was engineered specifically for deterministic, low-latency data buffering in mixed-clock-domain systems - emphasizing flag reliability, pin compatibility, and ease of integration into legacy TTL infrastructure.

FAQ

What is the default Almost Empty and Almost Full offset value for CY7C4201-15JXCT?

The default offset values for both Almost Empty and Almost Full flags are 007h (7 decimal), meaning PAE asserts when ≤7 words remain unread and PAF asserts when ≤7 words of free space remain. These values are stored in dedicated 8-bit offset registers and can be reprogrammed via WEN2/LD and WCLK/RCLK sequences during initialization.

Can CY7C4201-15JXCT operate with a single clock for both read and write?

Yes - RCLK and WCLK pins may be tied together for single-clock synchronous operation. In this mode, the FIFO behaves as a standard clocked FIFO with all timing referenced to one clock source, simplifying design in systems where read and write rates are matched or tightly coupled.

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

At reset (RS active), the logic state of WEN2/LD determines mode: if HIGH, the device configures for dual write-enable operation (WEN1 + WEN2); if LOW, it enters flag-offset programming mode (LD mode). This configuration is latched and remains fixed until next reset - no runtime reconfiguration is possible.

Is CY7C4201-15JXCT compatible with 3.3 V logic systems?

No - CY7C4201-15JXCT is specified for 5 V ±10% operation (4.5 V to 5.5 V) and features TTL-compatible input thresholds and output drive levels. Interfacing with 3.3 V systems requires level-shifting circuitry or voltage translation ICs to prevent damage and ensure reliable signal recognition.