Infineon Technologies CY7C4275V-15ASC

Overview

CY7C4275V-15ASC from Cypress Semiconductor is a 32K × 18-bit, low-voltage (3.3 V), high-speed asynchronous FIFO memory with independent read/write clocks, programmable Almost Empty/Almost Full flags, and Retransmit functionality. It operates at up to 66.7 MHz (15 ns cycle time), draws 30 mA active current and 4 mA standby current, and is housed in a 64-pin 10×10 mm STQFP package. It serves as a data buffer in high-speed communications interfaces between mismatched clock domains.

For engineers reviewing the CY7C4275V-15ASC datasheet, CY7C4275V-15ASC pinout, CY7C4275V-15ASC application, or CY7C4275V-15ASC equivalent, key selection criteria include its dual-clock asynchronous operation, programmable flag offsets, depth/width expansion capability, and 32K × 18-bit buffering capacity for real-time packet buffering and multiprocessor handshaking.

Technical Context

The CY7C4275V-15ASC implements a dual-port SRAM-based FIFO architecture with separate write pointer (WCLK/WEN controlled) and read pointer (RCLK/REN controlled), enabling true simultaneous read/write operations without arbitration. Its flag logic supports both synchronous (via VCC/SMODE = VSS) and asynchronous (VCC/SMODE = VCC) modes for PAE and PAF signals.

Depth expansion uses WXO/RXO–WXI/RXI cascading with FL pin configuration (first device FL = VSS, others FL = VCC); width expansion shares control lines across parallel devices. Retransmit (RT) resets the read pointer to enable packet retransmission without host CPU intervention.

Key Specifications

Pinout & Package

Package: 64-pin STQFP (10 mm × 10 mm, 0.5 mm pitch), RoHS-compliant, surface-mount.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72V2115L15PF, CY7C4275V-15ASC provides integrated Retransmit and configurable flag synchronization, reducing host-side firmware complexity; compared with NB3N502DG, it delivers actual memory-based buffering rather than signal distribution - making it functionally distinct and non-interchangeable.

Availability

CY7C4275V-15ASC is available at Aetrix Electronics and suitable for high-speed data acquisition, multiprocessor interconnect, and serial communications buffering requiring stable component supply and long-term industrial availability.

Supply support for CY7C4275V-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 mixed-signal ICs for embedded control, connectivity, and memory applications.

The CY7C4275V belongs to the CY7C42X5V Deep Sync FIFO product line, engineered specifically for low-latency, high-reliability data buffering across asynchronous clock domains in industrial and communications equipment.

FAQ

What is the purpose of the VCC/SMODE pin on CY7C4275V-15ASC?

The VCC/SMODE pin selects synchronization mode for the Programmable Almost Empty (PAE) and Programmable Almost Full (PAF) flags. When tied to VCC, PAE and PAF operate asynchronously; when tied to VSS, PAE is synchronized to RCLK and PAF to WCLK. This allows designers to match flag timing behavior to system clock domain requirements without external logic.

How does the Retransmit (RT) function work in standalone mode?

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

Can CY7C4275V-15ASC be used in depth-expanded configurations with other densities in the CY7C42X5V family?

Yes - CY7C4275V-15ASC supports depth expansion with any member of the CY7C42X5V family (e.g., CY7C4255V, CY7C4265V) using WXO/RXO–WXI/RXI cascading and proper FL pin assignment. All devices in the chain must share the same WCLK/RCLK frequencies and operate under identical VCC/SMODE settings to ensure consistent flag timing.

What is the minimum setup/hold time requirement for WEN relative to WCLK?

The CY7C4275V-15ASC requires WEN to be stable for at least 4 ns before (tENS) and 0 ns after (tENH) the rising edge of WCLK under -15 speed grade conditions. This ensures reliable write enable sampling and prevents metastability in the write control path during high-speed operation.