Infineon Technologies CY7C4215V-15ASC

Overview

CY7C4215V-15ASC from Cypress Semiconductor is a 512 × 18-bit, 3.3 V synchronous FIFO memory with 15 ns read/write cycle time, 67 MHz maximum clock frequency, and 5 V-tolerant inputs. It serves as a high-speed data buffer in asynchronous interface bridging between mismatched clock domains, supporting simultaneous read/write operations with programmable Almost Empty/Almost Full flags. Used in industrial communications controllers for packetized serial data buffering.

For engineers reviewing the CY7C4215V-15ASC datasheet, CY7C4215V-15ASC pinout, CY7C4215V-15ASC application, or CY7C4215V-15ASC equivalent, key selection criteria include depth (512 words), width (18-bit bus), flag synchronization mode (VCC/SMODE configurable), retransmit capability, and TQFP-64 packaging compatibility with depth/width expansion.

Technical Context

The CY7C4215V-15ASC implements a dual-clock, 18-bit-wide SRAM-based FIFO with independent WCLK and RCLK domains, enabling true asynchronous operation. Its status flags-EF, FF, PAE, PAF, and WXO/HF-are decoded from synchronized read/write pointer positions, with EF updated exclusively on RCLK edges and FF on WCLK edges.

Programmable offset registers (12-bit) allow user-defined Almost Empty/Almost Full thresholds; default values are 63 words from Empty/Full boundaries. Retransmit (RT) functionality resets the read pointer to enable packet replay without external logic, requiring WCLK/RCLK disable during the RT pulse.

Key Specifications

Pinout & Package

Package: 64-pin 14 × 14 mm TQFP (Thin Quad Flat Package) with standard JEDEC footprint and Pb-free finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72V2115L15PF and NB3N502MNR2G, the CY7C4215V-15ASC uniquely combines depth-programmable flags, hardware retransmit, and dual-mode flag synchronization-making it irreplaceable in deterministic packet buffering where latency predictability and error resilience are critical.

Availability

CY7C4215V-15ASC is available at Aetrix Electronics and suitable for industrial serial gateways, multi-processor interconnects, and high-speed data acquisition systems requiring stable component supply across extended product lifecycles.

Supply support for CY7C4215V-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, with global manufacturing and quality certification to ISO 9001 and IATF 16949.

The CY7C42X5V family targets high-reliability data buffering in electrically noisy environments-optimized for deterministic latency, robust flag signaling, and seamless integration into heterogeneous clock-domain systems.

FAQ

What is the function of the VCC/SMODE pin on CY7C4215V-15ASC?

The VCC/SMODE pin configures the synchronization behavior of the Programmable Almost Empty (PAE) and Programmable Almost Full (PAF) flags. When tied to VSS (ground), PAE becomes synchronized to RCLK and PAF to WCLK-ensuring deterministic flag transitions aligned with respective clock domains. When tied to VCC, both flags operate asynchronously, offering faster response but less predictable timing relative to clock edges. This pin does not affect EF or FF flag behavior, which remain strictly synchronous.

Can CY7C4215V-15ASC be used in single-clock mode?

Yes. The CY7C4215V-15ASC supports single-clock operation by connecting WCLK and RCLK together, with WEN and REN independently controlled. In this configuration, the FIFO behaves as a clocked dual-port buffer with guaranteed setup/hold timing per the 15 ns cycle specification. All status flags remain valid, and depth/width expansion remains functional-though cascading requires careful clock skew management across devices.

How does the Retransmit (RT) function interact with ongoing read/write operations?

The RT pin must be pulsed HIGH while WCLK and RCLK are held inactive (no transitions) for tRTR (minimum 20 ns) before and after the pulse. During RT assertion, the internal read pointer resets to the first physical location, and subsequent reads output previously written data in order. Writes may continue during RT if WEN is active, and those new entries are appended after the retransmitted data-enabling seamless "append-on-replay" behavior without data loss or pointer corruption.

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

WEN must be stable for a minimum of 4 ns before (tENS) and 1 ns after (tENH) the rising edge of WCLK to guarantee valid write initiation. These values are specified in the -15 speed grade and verified across commercial temperature range (0°C to 70°C). Violating these margins risks metastability in the write-enable path, potentially causing missed writes or spurious flag transitions-especially under marginal voltage or temperature conditions.