Infineon Technologies CY7C433-10JXC

Overview

CY7C433-10JXC from Cypress Semiconductor is a 4,096 × 9-bit asynchronous FIFO memory with independent 50 MHz read/write capability, TTL-compatible I/O, and dual-flag control (Empty/Full/Half Full). It uses a dual-ported RAM cell architecture and supports width/depth expansion for system-level buffering in high-speed data interface applications such as UART bridging and video frame synchronization.

For engineers reviewing the CY7C433-10JXC datasheet, CY7C433-10JXC pinout, CY7C433-10JXC application, or CY7C433-10JXC equivalent, key selection criteria include its 10 ns access time, 35 mA ICC1 at 20 MHz, standalone retransmit function, and PLCC-28 package compatibility with legacy industrial control backplanes.

Technical Context

This FIFO implements fully asynchronous read and write ports with separate R and W strobes, enabling independent timing domains without clock domain crossing logic. The device features dedicated EF (Empty Flag), FF (Full Flag), and XO/HF (Expansion Out / Half Full) pins that support both standalone operation and cascaded depth expansion using parallel steering of control signals.

It integrates master reset (MR), retransmit (RT) input, and three-state output buffers with 2.4 V VOH and 0.4 V VOL under TTL load conditions. The internal dual-ported RAM cell ensures deterministic latency-tA = 10 ns, tRC = 20 ns-and supports zero hold-time (tHD = 0 ns) for simplified timing closure in burst-mode interfaces.

Key Specifications

Pinout & Package

Package: 28-pin Plastic Leaded Chip Carrier (PLCC), 11.43 mm × 11.43 mm, J-lead, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT7204L10PA and AM7204-10JC, CY7C433-10JXC uniquely combines PLCC-28 packaging, industrial temperature rating, and hardware retransmit-making it the only option for ruggedized serial protocol stacks requiring field-upgrade resilience.

Availability

CY7C433-10JXC is available at Aetrix Electronics and suitable for industrial automation, motor control, legacy bus interfacing, and embedded video subsystems requiring stable component supply across extended product lifecycles.

Supply support for CY7C433-10JXC 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-reliability interface and memory solutions for industrial, automotive, and communications infrastructure markets.

CY7C433 belongs to Cypress's legacy asynchronous FIFO product line, engineered specifically for deterministic latency buffering in mixed-signal control systems where clock domain isolation and fail-safe data retention are critical.

FAQ

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

The CY7C433-10JXC supports simultaneous 50 MHz read and write operations-verified by tRC = 20 ns and tWC = 20 ns specifications. This allows full-duplex data transfer at 450 MB/s aggregate bandwidth (9 bits × 50 MHz), provided setup/hold times (tSD = 6 ns, tHD = 0 ns) are met at the controller interface.

Does the device support depth expansion, and how is it implemented?

Yes-depth expansion is implemented via the XO/HF and MR# pins. In depth-expansion mode, XO/HF becomes Expansion Out (XO), driving the MR# input of the next FIFO in chain. Control signals (R#, W#, MR#) are wired in parallel across devices, preserving 50 MHz throughput without cumulative propagation delay stacking.

What is the function of the FL/RT# pin, and what conditions must be met to activate retransmit?

FL/RT# serves dual purpose: as Flag select in width expansion, and as Retransmit enable in standalone mode. To activate retransmit, FL/RT# must be driven LOW while both R# and W# are held HIGH; then sequential R# pulses retrieve previously read data-enabling automatic retry after communication errors without host CPU involvement.

Is the CY7C433-10JXC RoHS compliant, and what package variants are offered?

Yes-the "JXC" suffix denotes a Pb-free, RoHS-compliant 28-pin PLCC package with JEDEC-standard lead finish. Cypress also offered this part in 300-mil DIP and 7×7 mm TQFP, but CY7C433-10JXC specifically refers to the PLCC variant, verified in Document #38-06001 Rev. *B.