Infineon Technologies CY7C4201V-15AC

Overview

CY7C4201V-15AC from Cypress Semiconductor is a 256 × 9-bit synchronous FIFO memory with 3.3 V operation, 66 MHz max clock frequency (15 ns cycle time), 5 V-tolerant inputs, and programmable Almost Empty/Almost Full flags. It serves as a high-speed data buffer in multi-processor interconnects and serial communication interfaces requiring deterministic latency and independent read/write timing.

For engineers reviewing the CY7C4201V-15AC datasheet, CY7C4201V-15AC pinout, CY7C4201V-15AC application, or CY7C4201V-15AC equivalent, key selection criteria include its 256-word depth, dual-clock asynchronous operation, synchronous flag architecture tied to RCLK/WCLK edges, and TQFP-32 package compatibility with space-constrained PCB layouts.

Technical Context

The CY7C4201V-15AC implements a dual-port SRAM array with independent read and write pointers, controlled by separate free-running clocks (RCLK and WCLK) and enable pairs (REN1/REN2, WEN1/WEN2/LD). Its status flags-EF, FF, PAE, PAF-are fully synchronous: EF and PAE update on RCLK edges; FF and PAF update on WCLK edges.

Flag offsets are programmable via WEN2/LD in load mode, supporting single-word granularity (default Empty-7/Full-7). The device uses 0.65 µm CMOS technology, features center power/ground pins for noise reduction, and supports width expansion via parallel data bus stacking without external logic.

Key Specifications

Pinout & Package

Package: 32-pin TQFP (7 mm × 7 mm), RoHS-compliant, with center VCC and GND pins for reduced switching noise.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT7203L15JG and SN74V245-15PAG, the CY7C4201V-15AC uniquely combines 3.3 V operation, 5 V-tolerant inputs, and user-programmable flags in a standard TQFP-32 package-enabling direct integration into cost-sensitive industrial controllers without redesign.

Availability

CY7C4201V-15AC is available at Aetrix Electronics and suitable for high-speed data acquisition, multi-processor interconnects, and serial communication interfaces requiring stable component supply across extended production lifecycles.

Supply support for CY7C4201V-15AC 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 fabless semiconductor company specializing in programmable system-on-chip solutions, memory, and interface ICs for industrial, automotive, and consumer applications.

The CY7C42X1V family was designed specifically for deterministic, low-latency data buffering in mixed-signal and multi-clock embedded systems-emphasizing synchronous flag reliability and voltage-flexible I/O.

FAQ

What is the default Almost Empty/Almost Full offset value for CY7C4201V-15AC?

The default Almost Empty and Almost Full offsets are both set to 7 words (007h). This means PAE asserts when ≤7 unread words remain, and PAF asserts when ≥249 words are stored (256 − 7). These values are stored in on-chip 8-bit registers and can be reprogrammed via WEN2/LD in load mode using four consecutive WCLK transitions.

Can CY7C4201V-15AC operate with a single clock for both read and write?

Yes. RCLK and WCLK pins may be tied together for single-clock operation. In this configuration, the device functions as a clocked FIFO with unified timing, retaining full flag functionality-EF and PAE update on the common clock's rising edge, while FF and PAF also update on that same edge, preserving synchronous behavior within one domain.

How does the Reset (RS) pin affect FIFO pointer states and flag timing?

Asserting RS (HIGH) forces the FIFO into a known empty state: read/write pointers reset to zero, EF goes LOW after tRSF delay, and all Q0–Q8 outputs drive LOW. Flags become valid within tRSF (≤15 ns) after RS deassertion. No read/write operations are permitted while RS is active, and REN/WEN must remain inactive during reset recovery.

Is width expansion supported, and what signals must be shared between devices?

Yes. Width expansion to 18-bit or wider is supported by connecting D0–D8 and Q0–Q8 in parallel across multiple CY7C4201V-15AC units. Shared signals include RCLK, WCLK, REN1, WEN1, RS, and OE. EF/FF flags must be OR'd externally; PAE/PAF may be monitored from any single device due to identical pointer tracking.