Infineon Technologies CY7C4245-10ASXCT

Overview

CY7C4245-10ASXCT from Cypress Semiconductor is a 4K × 18-bit synchronous FIFO memory with 100 MHz operation (10 ns read/write cycle time), TTL-compatible I/O, and programmable Almost Empty/Almost Full flags. It supports independent read/write clocks, retransmit functionality, and depth/width expansion for buffering in high-speed data acquisition and multiprocessor interfaces.

For engineers reviewing the CY7C4245-10ASXCT datasheet, CY7C4245-10ASXCT pinout, CY7C4245-10ASXCT application, or CY7C4245-10ASXCT equivalent, key selection criteria include its 4K-depth 18-bit bus width, synchronous flag timing control via VCC/SMODE, cascading capability using WXO/RXO/FL pins, and support for both single-clock and fully asynchronous read/write operation.

Technical Context

The CY7C4245-10ASXCT implements a dual-port SRAM array with separate read and write pointer logic, enabling simultaneous access without arbitration. Its flag architecture includes five status outputs-EF, FF, PAE, PAF, and WXO/HF-with EF synchronized to RCLK and FF to WCLK for deterministic timing.

Programmable offset registers (12-bit) allow user-defined Almost Empty and Almost Full thresholds, configurable via LD/WEN/WCLK sequences. The retransmit function resets the read pointer on RT pulse, supporting packet-level data recovery in communication links without external controller intervention.

Key Specifications

Pinout & Package

Package: 64-pin TQFP (10 mm × 10 mm, 0.5 mm pitch) - surface-mount package optimized for high-density PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72V2105L10PF and SN74ALVC7804N, the CY7C4245-10ASXCT uniquely combines 4K depth, retransmit, programmable flags, and full expansion support-making it optimal for high-reliability, multi-device buffering architectures requiring deterministic recovery behavior.

Availability

CY7C4245-10ASXCT is available at Aetrix Electronics and suitable for high-speed data acquisition, multiprocessor interfacing, serial communication buffering, and video frame buffering requiring stable component supply across industrial and embedded design cycles.

Supply support for CY7C4245-10ASXCT 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 family was developed specifically for high-throughput, low-latency data buffering in mixed-clock-domain systems requiring deterministic flag timing and scalable depth.

FAQ

What is the default Almost Empty offset value for CY7C4245-10ASXCT?

The default Almost Empty offset is 127 words. This means the PAE flag asserts when 127 or fewer words remain in the FIFO. The offset is stored in a 12-bit register and can be reprogrammed using the LD/WEN/WCLK sequence described in the programming section of the datasheet.

Can CY7C4245-10ASXCT operate with a single clock for both read and write?

Yes. WCLK and RCLK may be tied together for single-clock operation. In this mode, the device functions as a clock-synchronized FIFO with deterministic timing, provided WEN and REN are controlled independently to avoid simultaneous read/write conflicts on the same cycle.

How does the FL/RT pin function in standalone versus cascaded configurations?

In standalone mode, FL/RT operates as Retransmit (RT): a HIGH pulse resets the read pointer to the first location. In cascaded depth expansion, FL configures device position: first device has FL = GND; subsequent devices have FL = VCC. These modes are mutually exclusive and determined by system wiring.

Is the Half Full flag available in all configuration modes?

Yes - the WXO/HF pin provides Half Full status in standalone and width-expansion modes. In depth expansion, WXO becomes Write Expansion Out and HF functionality is disabled; Half Full indication must be derived externally or omitted in that topology.