Infineon Technologies CY7C4205-10AXC

Overview

CY7C4205-10AXC from Cypress Semiconductor is a 256 × 18-bit synchronous FIFO memory with 10 ns read/write cycle time, 100 MHz clock support, and TTL-compatible I/O. It implements independent read/write clocks (RCLK/WCLK), programmable Almost Empty/Almost Full flags, and retransmit functionality for packet buffering in high-speed data acquisition and multiprocessor interfaces.

For engineers reviewing the CY7C4205-10AXC datasheet, CY7C4205-10AXC pinout, CY7C4205-10AXC application, or CY7C4205-10AXC equivalent, this device supports asynchronous dual-clock operation, depth/width expansion, and precise status flag control-critical for deterministic buffering in real-time communication and embedded control systems.

Technical Context

The CY7C4205-10AXC uses a dual-port SRAM array with separate read and write pointer logic, enabling simultaneous read/write at up to 100 MHz. Its synchronous flag architecture ties EF exclusively to RCLK and FF exclusively to WCLK, ensuring cycle-accurate state reporting without metastability risk.

Programmable offset registers (12-bit) allow user-defined Almost Empty/Almost Full thresholds; default values are 31 words for PAE and 31 words for PAF. The FL/RT pin enables standalone retransmit mode or cascaded depth expansion via WXO/RXO and WXI/RXI signals.

Key Specifications

Pinout & Package

Package: 64-pin TQFP (10 mm × 10 mm, 0.5 mm pitch) - surface-mount compatible with automated PCB assembly and thermal management in dense layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72205L10PF and SN74V293-10PAG, the CY7C4205-10AXC uniquely integrates retransmit and synchronous flag configuration via VCC/SMODE, enabling hardware-accelerated flow control in latency-critical embedded systems without external logic.

Availability

CY7C4205-10AXC is available at Aetrix Electronics and suitable for high-speed data acquisition, multiprocessor interfacing, serial protocol bridging, and real-time industrial control requiring stable component supply across long-lifecycle designs.

Supply support for CY7C4205-10AXC 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 CY7C42X5 FIFO product line targets deterministic data buffering in systems with asynchronous clock domains, emphasizing low-latency flag response, expandability, and hardware-based flow control.

FAQ

What is the function of the VCC/SMODE pin on CY7C4205-10AXC?

The VCC/SMODE pin configures the synchronization mode of the Programmable Almost Empty (PAE) and Programmable Almost Full (PAF) flags. When tied to VSS, PAE becomes synchronous to RCLK and PAF to WCLK; when tied to VCC, both operate asynchronously. This allows designers to match flag timing to their clock domain requirements without external logic.

How does the retransmit (RT) feature work in standalone mode?

In standalone mode, a HIGH pulse on the FL/RT pin resets the internal read pointer to the first physical location of the FIFO. After RT activation, subsequent reads (with REN active and OE low) output previously written data in sequence until the read pointer equals the write pointer. WCLK and RCLK must be disabled during and for tRTR (10 ns) after the RT pulse.

Can CY7C4205-10AXC be used in single-clock synchronous mode?

Yes. The CY7C4205-10AXC supports single-clock operation by connecting RCLK and WCLK together. In this configuration, read and write operations share the same clock edge, and the device behaves as a synchronous FIFO with guaranteed setup/hold margins per the -10 speed grade (10 ns cycle time).

What is the purpose of the FL pin in depth expansion configurations?

In depth expansion, the FL pin identifies the first device in the daisy chain: it is tied to VSS on the first device and to VCC on all subsequent devices. This enables automatic cascade initialization-only the first device accepts writes on its WXI pin, while downstream devices propagate WXO/RXO signals to maintain pointer coherence across the expanded FIFO array.