Infineon Technologies CY7C4275-10ASC

Overview

CY7C4275-10ASC from Cypress Semiconductor is a 32K × 18-bit high-speed synchronous FIFO memory with 100 MHz operation (10 ns read/write cycle), 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 CY7C4275-10ASC datasheet, CY7C4275-10ASC pinout, CY7C4275-10ASC application, or CY7C4275-10ASC equivalent, this device is selected for deterministic latency control, dual-clock domain bridging, and industrial-grade FIFO buffering where flag synchronization mode (asynchronous vs. RCLK/WCLK-synchronized) and cascade expandability are critical design factors.

Technical Context

The CY7C4275-10ASC implements a clocked, dual-port RAM architecture with separate WCLK/REN and RCLK/WEN control paths, enabling true asynchronous read/write operation. Its status logic generates five synchronized flags - EF, FF, HF, PAE, PAF - with configurable timing alignment via VCC/SMODE pin.

It features dedicated expansion pins (WXI/WXO, RXI/RXO, FL/RT) supporting daisy-chained depth expansion and width-expansion configurations. The retransmit function allows repeat output of the last valid word without altering pointer state, and the OE pin enables bus sharing in multi-device systems.

Key Specifications

Pinout & Package

64-pin 10×10 mm thin quad flat pack (TQFP) with center power/ground pins to minimize switching noise and improve signal integrity in high-speed FIFO applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72205L10PFI and MC100E127FNR2G, the CY7C4275-10ASC uniquely combines TTL compatibility, retransmit functionality, and VCC/SMODE-configurable flag synchronization - making it optimal for industrial embedded systems requiring robust, pin-defined handshaking without external logic.

Availability

CY7C4275-10ASC is available at Aetrix Electronics and suitable for high-speed data acquisition, multiprocessor interfacing, and communications protocol buffering requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CY7C4275-10ASC 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 CY7C4275 belongs to Cypress's Deep Sync FIFO product line, engineered specifically for deterministic, low-latency data buffering across asynchronous clock domains in mission-critical embedded systems.

FAQ

What is the function of the VCC/SMODE pin on CY7C4275-10ASC?

The VCC/SMODE pin configures the synchronization mode of the Programmable Almost Empty (PAE) and Programmable Almost Full (PAF) flags. When tied to VCC, PAE/PAF operate asynchronously; when tied to VSS, PAE synchronizes to RCLK and PAF to WCLK - ensuring glitch-free flag transitions aligned with respective clock domains.

Can CY7C4275-10ASC be used in single-clock mode?

Yes. The RCLK and WCLK inputs may be connected to the same clock source for single-clock operation. In this configuration, the device behaves as a standard synchronous FIFO with shared timing, while retaining independent REN/WEN controls and all status flags.

How does the retransmit function work on CY7C4275-10ASC?

The retransmit function is activated by pulsing the FL/RT pin low while OE is active. This causes the FIFO to output the last valid word again without advancing the read pointer or affecting EF/FF flag states - useful for protocol retries or diagnostic echo operations.

What is the purpose of the center power and ground pins in the TQFP package?

The center-placed VCC and GND pins reduce simultaneous switching noise (SSN) by shortening current return paths and minimizing inductive coupling between I/O banks. This improves signal integrity and timing margin at 100 MHz operation, especially in dense PCB layouts with multiple high-speed devices.