Infineon Technologies CY7C4831-10AC

Overview

CY7C4831-10AC from Cypress Semiconductor is a double 2K × 9-bit synchronous FIFO memory IC with independent read/write clock domains, 10 ns read/write cycle time, 100 MHz operation, and programmable Almost Empty/Almost Full flags synchronized to respective clocks. It serves as a dual-channel data buffer in high-speed inter-processor communication and real-time data acquisition systems.

For engineers reviewing the CY7C4831-10AC datasheet, CY7C4831-10AC pinout, CY7C4831-10AC application, or CY7C4831-10AC equivalent, key selection criteria include dual 2K×9 depth, asynchronous read/write capability, 64-pin TQFP package compatibility, and flag synchronization behavior relative to RCLK/WCLK edges.

Technical Context

The CY7C4831-10AC implements two independent 2K × 9-bit FIFOs sharing a single 64-pin TQFP package, each with separate 9-bit input/output buses, dedicated WCLKA/WCLKB and RCLKA/RCLKB, and four status flags (Empty, Full, Programmable Almost Empty, Programmable Almost Full). Flag update timing is strictly clock-domain–locked: EFA/EFB and PAEA/PAEB update on RCLKA/RCLKB edges; FFA/FFB and PAFA/PAFB update on WCLKA/WCLKB edges.

It supports both single-clock (RCLK = WCLK) and fully asynchronous dual-clock operation, with programmable flag offsets settable to single-word granularity (default: Empty+7 / Full−7). Depth and width expansion are enabled via dedicated enable logic control pins (WENA2/LDA, WENB2/LDB), and output drivers feature three-state control via OEA/OEB.

Key Specifications

Pinout & Package

Package: 64-pin Thin Quad Flat Package (TQFP), 10 mm × 10 mm, 0.5 mm pitch, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72831L10PFI and CY7C4231-10AC, the CY7C4831-10AC delivers integrated dual-channel buffering with single-word programmable flags and expansion support - reducing component count, simplifying timing analysis, and enabling tighter flow-control precision in real-time embedded systems.

Availability

CY7C4831-10AC is available at Aetrix Electronics and suitable for high-speed data acquisition, multiprocessor interconnect, communications protocol bridging, and industrial PLC I/O expansion requiring stable component supply across commercial and industrial temperature ranges.

Supply support for CY7C4831-10AC 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 high-performance memory, PSoC, and timing solutions for industrial, automotive, and communications markets.

The CY7C48X1 family was designed specifically for high-bandwidth, low-latency data buffering in multi-clock domain systems - emphasizing deterministic flag timing, dual-channel integration, and seamless migration from legacy single-FIFO architectures.

FAQ

What is the function of the WENA2/LDA and WENB2/LDB pins?

WENA2/LDA and WENB2/LDB are dual-function pins whose behavior is determined at device reset: if held HIGH during reset, they act as secondary write enables; if held LOW, they serve as load-enable controls for the programmable Almost Empty/Almost Full flag offset registers. This dual-mode operation enables flexible configuration without additional control lines.

How does flag synchronization prevent metastability in cross-clock-domain systems?

Empty and Almost Empty flags update exclusively on RCLKA/RCLKB rising edges; Full and Almost Full flags update exclusively on WCLKA/WCLKB rising edges. This strict clock-domain binding ensures flags change state only within their native timing domain, eliminating setup/hold violations and guaranteeing one-cycle stable assertion before being sampled by associated logic.

Can CY7C4831-10AC operate with a single clock for both read and write operations?

Yes - RCLKA/RCLKB and WCLKA/WCLKB may be tied together for single-clock operation. The device retains full functionality including independent enable controls and synchronized flags. However, dual-clock mode is required to exploit true asynchronous buffering between independent clock domains.

What is the minimum reset pulse width required for reliable initialization?

The minimum reset pulse width is 10 ns at 100 MHz operation (CY7C4831-10AC speed grade), as specified in the switching characteristics table. Pulse widths below this value are not guaranteed to initialize internal pointers and flags correctly, risking undefined FIFO state upon first access.