Infineon Technologies CY7C0831AV-133BBXI

Overview

CY7C0831AV-133BBXI from Cypress Semiconductor is a 3.3V synchronous true dual-port SRAM with 128K × 18-bit (2 Mbit) density, pipelined read/write operation, 133 MHz maximum clock frequency, and 4.0 ns clock-to-data access time. It supports independent simultaneous access on left/right ports for real-time inter-processor communication in embedded control systems.

For engineers reviewing the CY7C0831AV-133BBXI datasheet, CY7C0831AV-133BBXI pinout, CY7C0831AV-133BBXI application, or CY7C0831AV-133BBXI equivalent, key selection criteria include burst counter support, mailbox interrupt capability, JTAG boundary scan compliance, and dual chip enable architecture for depth expansion.

Technical Context

This device implements two fully independent synchronous ports sharing a single 128K × 18-bit RAM array, with pipelined address/data registers per port to minimize setup/hold timing constraints. Each port features a programmable 17-bit burst address counter, mask register, and mirror register - enabling automatic sequential addressing and wrap-around control without external logic.

The left and right ports each provide dedicated ADS, CNTEN, CNTRST, CNT/MSK, INT, and CNTINT signals, along with separate byte enables (B0/B1), chip enables (CE0L/CE1L, CE0R/CE1R), and output enables (OEL/OER). The MRST input performs asynchronous global reset of counters, mask registers, and interrupt flags.

Key Specifications

Pinout & Package

Package: 144-ball FBGA (13 mm × 13 mm, 1.0 mm pitch), RoHS-compliant, ball pitch compatible with standard SMT reflow profiles.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous dual-port SRAM applications.

Compared with CY7C0832AV-167AXI, CY7C0831AV-133BBXI trades 34 MHz speed margin for lower power and cost while retaining identical feature set; versus IDT70V27L15PF8, it delivers integrated burst control and mailbox signaling - eliminating 3–5 discrete logic ICs in new designs.

Availability

CY7C0831AV-133BBXI is available at Aetrix Electronics and suitable for industrial PLC backplanes, real-time motion controllers, avionics data concentrators, and medical imaging pipelines requiring stable component supply across extended product lifecycles.

Supply support for CY7C0831AV-133BBXI 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 memory and programmable solutions for industrial, automotive, and aerospace applications.

The FLEx18™ family targets deterministic, low-latency inter-processor communication in safety-critical embedded systems - emphasizing synchronous dual-port architecture, hardware mailboxing, and JTAG testability.

FAQ

What is the function of the CNT/MSK pins on CY7C0831AV-133BBXI?

CNT/MSKL and CNT/MSKR are active-LOW inputs that enable access to the respective port's address counter mask register. When asserted, they allow the host to read or write the 17-bit mask register via the address/data bus - configuring which counter bits increment or wrap. When held HIGH, mask register access is disabled and counter operations follow standard control signals (CNTEN, CNTRST).

Can CY7C0831AV-133BBXI operate with only one port enabled?

Yes. Each port has independent chip enables (CE0L/CE1L and CE0R/CE1R), allowing one port to remain fully active while the other is powered down. When CE0L = HIGH and CE1L = LOW (or vice versa), the left port enters low-power standby (55 mA typical), while the right port continues normal operation - enabling asymmetric power management in multi-core systems.

How does the mailbox interrupt mechanism work between ports?

The upper two memory locations (0x1FFFE for left port mailbox, 0x1FFFF for right port) act as hardware mailboxes. Writing to the opposite port's mailbox asserts its INT pin LOW; reading that location resets the flag HIGH. This flow-through behavior follows the clock edge of the writing or reading port - enabling precise, cycle-accurate inter-processor signaling without software polling.

Is the MRST pin required to be asserted at power-up?

Yes. MRST is an asynchronous active-LOW input that must be held LOW for ≥100 ns after VDD reaches 2.7 V, then released to HIGH. This initializes both burst counters to zero, mask registers to 0xFFFF, and clears all INT/CNTINT flags. Failure to perform MRST at power-up may result in undefined counter states and unreliable mailbox behavior.