Infineon Technologies CY7C4421-10JXC

Overview

CY7C4421-10JXC from Cypress Semiconductor is a 64 × 9-bit synchronous FIFO memory with TTL-compatible I/O, 10 ns read/write cycle time, and programmable Almost Empty/Almost Full flags. It operates at up to 100 MHz, draws 35 mA active current, and uses dual independent clocks (WCLK/RCLK) for asynchronous buffering in high-speed data acquisition systems.

For engineers reviewing the CY7C4421-10JXC datasheet, CY7C4421-10JXC pinout, CY7C4421-10JXC application, or CY7C4421-10JXC equivalent, key selection criteria include its 64-word depth, 9-bit bus width, programmable flag offsets, center-power-pin noise reduction, and TQFP-32 package compatibility with IDT72421.

Technical Context

The CY7C4421-10JXC implements a dual-port SRAM array (64 × 9 bits) with separate read and write pointer logic, synchronous flag generation (EF/FF/PAE/PAF), and configurable WEN2/LD pin behavior-either as second write enable or flag-offset register load control. Reset (RS) initializes the FIFO to empty state with EF asserted.

Flag timing is clock-domain-specific: EF and PAE are synchronized to RCLK; FF and PAF to WCLK. Programmable offsets default to 7 words, enabling precise buffer-level monitoring. The device supports both single-clock (WCLK = RCLK) and fully asynchronous operation with independent enable controls (WEN1/WEN2/LD, REN1/REN2).

Key Specifications

Pinout & Package

32-pin Thin Quad Flat Package (TQFP), 7 mm × 7 mm, 0.5 mm pitch, RoHS-compliant. Center power (Pin 16) and ground (Pin 17) pins minimize supply noise coupling during high-speed toggling.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT72421L10JGI, CY7C4421-10JXC offers identical functionality with minor reset timing differences, while MC100EP422FA trades programmability and TTL compatibility for raw speed and ECL signaling-making it unsuitable for direct substitution but viable in specialized high-frequency analog infrastructure.

Availability

CY7C4421-10JXC is available at Aetrix Electronics and suitable for high-speed data acquisition, multiprocessor interfacing, and communications protocol bridging requiring stable component supply across industrial and test equipment lifecycles.

Supply support for CY7C4421-10JXC 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-performance memory and interface ICs for embedded, automotive, and industrial applications with emphasis on reliability and signal integrity.

The CY7C42X1 family delivers synchronous FIFO solutions optimized for clock-domain bridging, featuring programmable flags, low-noise packaging, and wide temperature range operation for mission-critical buffering.

FAQ

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

The CY7C4421-10JXC requires a minimum RS pulse width of 10 ns to guarantee proper reset to empty state. This ensures all internal pointers and flag registers initialize correctly before first read/write. Pulse must be clean and free of ringing; a 20 ns pulse is recommended for margin in noisy environments.

Can WEN2/LD be used to reprogram flag offsets during normal operation?

Yes-WEN2/LD can dynamically reprogram PAE/PAF offsets without resetting the FIFO. Hold WEN2/LD LOW and apply four consecutive WCLK edges to write new values to empty LSB, empty MSB, full LSB, and full MSB registers respectively. No data loss occurs during this process.

Is width expansion supported without external logic?

No-width expansion requires external AND/OR gates to combine EF/FF signals across multiple devices. PAE/PAF can be monitored from any single device in the group, but composite full/empty detection needs discrete logic to avoid race conditions during boundary transitions.

Does the CY7C4421-10JXC support hot insertion or live bus connection?

No-CY7C4421-10JXC lacks hot-swap protection circuitry. Applying power or signals before VCC stabilizes may cause latch-up or undefined flag states. Always sequence VCC before applying clocks or I/O signals, and use series resistors on D/Q lines if connecting to live buses.