Infineon Technologies CY7C433-10AXC

Overview

CY7C433-10AXC from Cypress Semiconductor is a 4,096 × 9-bit asynchronous FIFO memory with dual-port RAM architecture, 50 MHz independent read/write capability, TTL-compatible I/O, and integrated Empty/Full/Half-Flag logic - deployed in high-throughput data buffering between mismatched clock domains in industrial communication gateways.

For engineers reviewing the CY7C433-10AXC datasheet, CY7C433-10AXC pinout, CY7C433-10AXC application, or CY7C433-10AXC equivalent, key selection criteria include 4K-depth depth-expansion support, retransmit functionality for packet recovery, low 35 mA ICC1 at 20 MHz, and PLCC-28 package compatibility with legacy board layouts.

Technical Context

This FIFO implements independent asynchronous read and write pointers using dual-ported static RAM cells, enabling concurrent access without arbitration. Flag generation (EF, FF, HF) is fully synchronous to respective control edges (R# and W#), with propagation delays specified down to 10 ns for tA and tRC.

The device supports three operational modes: standalone, width expansion (via XI/XO pins), and depth expansion (using XO/HF as expansion-out signal). Retransmit (RT) is edge-triggered and requires both R# and W# HIGH during activation, enabling deterministic replay of buffered data without external state tracking.

Key Specifications

Pinout & Package

CY7C433-10AXC is housed in a 28-pin Plastic Leaded Chip Carrier (PLCC-28) package with J-leads, 11.43 mm × 11.43 mm body size, and 1.27 mm lead pitch - designed for through-hole or surface-mount reflow compatibility in industrial PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT7204L10PA and MC10E141FN, CY7C433-10AXC uniquely combines 5V TTL compatibility, hardware retransmit, and PLCC-28 packaging - making it the sole option for retrofitting legacy industrial controllers requiring pin-identical replacement and protocol-level recovery.

Availability

CY7C433-10AXC is available at Aetrix Electronics and suitable for industrial serial gateways, legacy bus bridges, medical imaging pipelines, and avionics ARINC 429 interfaces requiring stable component supply across extended product lifecycles.

Supply support for CY7C433-10AXC 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) is a U.S.-based semiconductor company specializing in programmable solutions for embedded systems, memory, and connectivity.

CY7C433 belongs to Cypress's legacy asynchronous FIFO product line, engineered specifically for deterministic data buffering in mixed-clock-domain industrial and communications equipment where software-managed queues introduce unacceptable jitter.

FAQ

What is the maximum clock frequency supported for independent read and write operations?

CY7C433-10AXC supports up to 50 MHz for both read and write operations independently, verified by tRC = 20 ns and tWC = 20 ns specifications under commercial temperature range. This allows sustained 450 MB/s aggregate bandwidth across the 9-bit bus without interlock or arbitration logic.

Does CY7C433-10AXC retain data during Master Reset (MR#)?

No - assertion of MR# asynchronously clears both read and write pointers and forces EF HIGH and FF/HF LOW, emptying the FIFO state. Data stored in the RAM array is not preserved; the device enters a known-empty condition, requiring reinitialization before new writes.

Can CY7C433-10AXC be used in depth-expansion configurations with other CY7C4xx devices?

Yes - CY7C433-10AXC supports depth expansion using XI/XO pins with any member of the CY7C419/421/425/429/433 family. The expansion technique routes control signals in parallel, preserving 10 ns access time regardless of stack height, as confirmed in the Functional Description section.

Is the Half-Full (HF) flag functional in all configuration modes?

HF operates as a true Half-Full indicator only in standalone and width-expansion modes. In depth-expansion mode, the same pin functions as Expansion-Out (XO), delivering pointer-status signals to the next device in the chain - this dual-role behavior is hardwired and cannot be disabled via configuration.