Infineon Technologies CY7C4215-15AXI

Overview

CY7C4215-15AXI from Cypress Semiconductor is a 512 x 18-bit synchronous FIFO memory with TTL-compatible interfaces, 10 ns read/write cycle time at 100 MHz, 45 mA typical ICC, and programmable Almost Empty/Almost Full flags. It supports independent read/write clocks, retransmit function, and depth/width expansion for data buffering in high-speed communication links and multiprocessor interconnects.

For engineers reviewing the CY7C4215-15AXI datasheet, CY7C4215-15AXI pinout, CY7C4215-15AXI application, or CY7C4215-15AXI equivalent, this device is selected for deterministic latency control, asynchronous clock domain bridging, and reliable packet retransmission in embedded serial interfaces and real-time acquisition systems.

Technical Context

The CY7C4215-15AXI implements a dual-clock, 18-bit-wide FIFO using SRAM-based dual-port architecture with synchronous Empty/Full flags (EF updated on RCLK, FF on WCLK) and configurable PAE/PAF flag synchronization via VCC/SMODE pin. It supports standalone, width-expanded (parallel 18-bit bus extension), and depth-expanded (daisy-chained cascade) configurations using WXO/HF, RXO, WXI, and RXI pins.

Its retransmit (RT) function resets the read pointer to the first physical location upon a HIGH pulse, enabling repeat delivery of buffered packets without host CPU intervention. The FL/RT dual-mode pin enables either first-load sequencing in cascaded depth expansion or standalone retransmit operation when tied low.

Key Specifications

Pinout & Package

Package: 64-pin TQFP (10 mm × 10 mm, 0.5 mm pitch) - RoHS-compliant surface-mount package optimized for signal integrity and thermal dissipation in dense PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72205L15PG and SN74V293-15PAG, the CY7C4215-15AXI uniquely integrates retransmit and flag synchronization mode selection into a single pin (FL/RT and VCC/SMODE), reducing external component count and enabling both robust packet recovery and deterministic flag timing in one device.

Availability

CY7C4215-15AXI is available at Aetrix Electronics and suitable for industrial serial gateways, real-time data acquisition systems, multiprocessor shared memory interfaces, and legacy bus protocol emulation requiring stable component supply and long-term lifecycle support.

Supply support for CY7C4215-15AXI 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 emphasis on reliability and industrial temperature operation.

The CY7C42X5 family targets high-speed data buffering where deterministic latency, clock domain isolation, and hardware-assisted flow control are critical-especially in test equipment, telecom line cards, and factory automation controllers.

FAQ

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

The default Almost Empty offset is 63 words, meaning the PAE flag asserts when 63 or fewer words remain in the 512-word FIFO. This value is stored in the internal 12-bit offset register and can be reprogrammed using the LD, WEN, and WCLK sequence described in the datasheet's Programming section.

Can CY7C4215-15AXI operate with a single clock for both read and write?

Yes-RCLK and WCLK pins may be tied together to enable single-clock operation. In this mode, the device functions as a synchronous FIFO with shared timing, retaining all flag functionality and retransmit capability, though maximum throughput is limited by the slower of the two operational clock domains.

How does the FL/RT pin behave in standalone versus cascaded configurations?

In standalone mode, FL/RT operates as Retransmit (RT): a HIGH pulse resets the read pointer to the first address. In cascaded depth expansion, it serves as First Load (FL): tied to VSS on the first device and VCC on all others to establish daisy-chain initialization order and prevent race conditions during power-up reset propagation.

Is the Half Full (HF) flag available in all expansion modes?

The HF flag is available in standalone and width-expansion configurations, where it is output on the WXO/HF pin. In depth expansion, that same pin becomes WXO (Write Expansion Out) and HF functionality is disabled; HF status must be derived externally or inferred from PAE/PAF thresholds in multi-device systems.