Infineon Technologies CY7C4265V-15ASC

Overview

CY7C4265V-15ASC from Cypress Semiconductor is a 16K × 18-bit, 3.3V low-voltage deep-sync FIFO memory with asynchronous read/write operation, 66.7 MHz max clock frequency, 10 ns minimum cycle time, and programmable Almost Empty/Almost Full flags. It serves as a high-speed data buffer in multiprocessor interconnects and communications interfaces.

For engineers reviewing the CY7C4265V-15ASC datasheet, CY7C4265V-15ASC pinout, CY7C4265V-15ASC application, or CY7C4265V-15ASC equivalent, this device supports dual-clock asynchronous buffering, depth/width expansion, retransmit functionality, and synchronous flag control via VCC/SMODE configuration - critical for deterministic latency in real-time data pipelines.

Technical Context

The CY7C4265V-15ASC implements a dual-port RAM core (16K × 18) with independent WCLK/REN and RCLK/WEN control paths, enabling true simultaneous read and write at up to 66.7 MHz. Its status logic generates five synchronized flags (EF, FF, HF, PAE, PAF), with HF shared on WXO and programmable offsets stored in an internal register accessed via LD strobe.

Flag synchronization is configurable: tying VCC/SMODE to VSS makes PAE/PAF synchronous to RCLK/WCLK respectively; tied to VCC, they operate asynchronously. Depth expansion uses WXI/RXI inputs and WXO/RXO outputs with FL/RT pin sequencing, while width expansion connects parallel D/Q buses with shared clocks and enables.

Key Specifications

Pinout & Package

64-pin 10×10 mm STQFP (Thin Quad Flat Package) with exposed thermal pad; RoHS-compliant, lead-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72V2113L15PF and NB3N502MNR2G, the CY7C4265V-15ASC uniquely combines 16K depth, retransmit capability, and full expansion support - making it optimal for adaptive, fault-tolerant data pipelines requiring hardware-level flow resilience.

Availability

CY7C4265V-15ASC is available at Aetrix Electronics and suitable for high-speed data acquisition, multiprocessor interconnect, industrial Ethernet bridge, and legacy bus protocol translation requiring stable component supply and long-term lifecycle assurance.

Supply support for CY7C4265V-15ASC 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 interface ICs for industrial, automotive, and communications systems, emphasizing signal integrity and timing determinism.

The CY7C4265V-15ASC belongs to Cypress's Deep Sync FIFO product line, engineered specifically for deterministic, low-latency data buffering across asynchronous clock domains in real-time embedded systems.

FAQ

What is the function of the VCC/SMODE pin on CY7C4265V-15ASC?

The VCC/SMODE pin configures synchronization mode for the Programmable Almost Empty (PAE) and Programmable Almost Full (PAF) flags. When tied to VSS, PAE synchronizes to RCLK and PAF to WCLK; when tied to VCC, both operate asynchronously. This setting directly affects flag timing predictability in multi-clock systems.

Can CY7C4265V-15ASC be used in single-clock mode?

Yes - WCLK and RCLK can be tied together for single-clock operation, with WEN and REN controlling data flow direction. In this mode, the device behaves as a standard synchronous FIFO while retaining all status flags and retransmit functionality, simplifying timing analysis in clock-constrained designs.

How does the retransmit function work on CY7C4265V-15ASC?

Retransmit is triggered by pulsing the FL/RT pin low in standalone mode. This causes the FIFO to output the most recently read word again on Q0–Q17, regardless of current read pointer position. It requires no external logic or register writes, enabling immediate frame recovery in serial communication protocols.

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

In depth expansion, FL identifies the master device in a daisy chain: the first device has FL tied to VSS, and all subsequent devices have FL tied to VCC. This configuration enables automatic cascade initialization and ensures correct write pointer propagation across chained FIFOs without external control logic.