Infineon Technologies CY7C4215-15AXIT

Overview

CY7C4215-15AXIT from Cypress Semiconductor is a 512 × 18-bit synchronous FIFO memory with 10 ns read/write cycle time, TTL-compatible I/O, and programmable Almost Empty/Almost Full flags. It supports independent 100 MHz read/write clocks (RCLK/WCLK), retransmit functionality, and depth/width expansion for buffering in high-speed data acquisition and multiprocessor interfaces.

For engineers reviewing the CY7C4215-15AXIT datasheet, CY7C4215-15AXIT pinout, CY7C4215-15AXIT application, or CY7C4215-15AXIT equivalent, key selection criteria include its 512-word depth, 18-bit bus width, synchronous flag timing control via VCC/SMODE, dual-clock asynchronous operation, and support for cascaded FIFO configurations using WXO/RXO/FL pins.

Technical Context

The CY7C4215-15AXIT implements a dual-port SRAM array with independent read and write pointers, controlled by separate RCLK and WCLK signals. Its flag logic generates EF (synchronized to RCLK), FF (synchronized to WCLK), and programmable PAE/PAF flags whose synchronization mode depends on the VCC/SMODE pin state.

Depth expansion uses WXI/WXO and RXI/RXO cascade pins with FL pin polarity defining first/intermediate device roles; width expansion connects multiple devices in parallel using shared clocks and enables while routing D/Q buses across units. Retransmit (RT) resets the read pointer to enable packet replay without external controller intervention.

Key Specifications

Pinout & Package

Package: 64-pin TQFP (10 mm × 10 mm, 0.5 mm pitch), RoHS-compliant, industrial temperature grade (–40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72205L15PG and SN74V293-15PAG, the CY7C4215-15AXIT uniquely integrates retransmit and FL/RT dual-mode functionality within the same 64-pin TQFP footprint, enabling simpler system-level error recovery and cascade configuration without additional logic.

Availability

CY7C4215-15AXIT is available at Aetrix Electronics and suitable for high-speed data acquisition, multiprocessor interconnect, serial protocol repeater, and industrial Ethernet node buffering requiring stable component supply across extended product lifecycles.

Supply support for CY7C4215-15AXIT 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 applications.

The CY7C42X5 FIFO family targets applications demanding deterministic, low-latency data buffering between asynchronous clock domains, with emphasis on expandability, flag programmability, and hardware-assisted reliability features.

FAQ

What is the function of the VCC/SMODE pin on CY7C4215-15AXIT?

The VCC/SMODE pin configures synchronization behavior of the Programmable Almost Empty (PAE) and Almost Full (PAF) flags. When tied to VCC, PAE/PAF operate asynchronously; when tied to VSS, PAE is synchronized to RCLK and PAF to WCLK. This ensures predictable flag timing in synchronous system designs without external resynchronization logic.

How does the retransmit (RT) feature 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 RCLK) output previously written data in sequence until the read pointer reaches the current write pointer. Data written after RT remains accessible and is not overwritten during replay.

Can CY7C4215-15AXIT be used in single-clock synchronous operation?

Yes. The RCLK and WCLK inputs may be tied together for single-clock operation. In this mode, the device functions as a standard synchronous FIFO with all timing referenced to one clock source. The EF and FF flags remain synchronized to that clock (EF to rising edge, FF to rising edge), preserving deterministic empty/full detection.

What is the default Almost Empty offset value for CY7C4215-15AXIT?

The default Almost Empty offset value is 63 words. This means the PAE flag asserts when 63 or fewer words remain in the FIFO. The offset is stored in a 12-bit register and can be reprogrammed via the LD/WEN/WCLK sequence to any value from 0 to 511, allowing fine-grained control of flow-control thresholds.