Infineon Technologies CYDMX256A16-65BVXI

Overview

CYDMX256A16 from Infineon Technologies (formerly Cypress) is a 16K × 16 asynchronous dual-port static RAM with true independent port access, one dedicated ADM (address/data multiplexed) interface and one configurable SRAM/ADM interface, 65 ns ADM access time, 40 ns SRAM interface access, and industrial temperature range operation. It enables interprocessor communication in real-time embedded systems requiring deterministic memory arbitration and mailbox-based interrupt signaling.

For engineers reviewing the CYDMX256A16 datasheet, CYDMX256A16 pinout, CYDMX256A16 application, or CYDMX256A16 equivalent, key selection criteria include dual-port arbitration behavior, port-independent 1.8 V/2.5 V/3.0 V I/O support, ultra-low standby current (2 µA typical), mailbox interrupt timing, and BGA-100 package compatibility with high-density PCB layouts.

Technical Context

This device implements fully asynchronous dual-port architecture with on-chip arbitration logic resolving simultaneous access to identical memory locations via BUSY# flag assertion and priority resolution within tBLA/tBLC timing windows. Each port operates independently with separate CS#, WE#, OE#, UB#, LB#, and I/O power domains (VDDIOL/VDDIOR).

The left port is fixed as ADM interface with ADV#L-controlled address latching; the right port is configurable via MSEL pin (0 = standard SRAM, 1 = ADM). Mailbox interrupts use upper two memory addresses (0x3FFF for right port, 0x3FFE for left port), with interrupt reset triggered only by owner-port read of its own mailbox location.

Key Specifications

Pinout & Package

100-ball Pb-free BGA package (6 mm × 6 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions validated per Infineon Document 001-08090 Rev. *K, Page 3.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IS61WV25616BLL-10MLI and AS6C4008-55TIN, CYDMX256A16 uniquely delivers integrated mailbox interrupts, port-configurable interfaces, and ultra-low standby current - making it the sole choice for low-power, event-driven dual-processor systems requiring deterministic arbitration without external glue logic.

Availability

CYDMX256A16 is available at Aetrix Electronics and suitable for interprocessor communication, video frame buffering, communications protocol stack buffering, and industrial PLC data exchange requiring stable component supply and long-term lifecycle support.

Supply support for CYDMX256A16 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

Infineon Technologies is a global semiconductor leader headquartered in Munich, Germany, delivering power systems, sensors, microcontrollers, and memory solutions for automotive, industrial, and IoT applications.

CYDMX256A16 belongs to Infineon's MoBL® (Mobile Low Power) ADM dual-port SRAM product line, designed specifically for low-latency, low-power interprocessor and real-time multimedia buffering in space-constrained embedded systems.

FAQ

What is the function of the MSEL pin on CYDMX256A16?

The MSEL pin configures the right port interface mode: LOW selects standard SRAM operation with dedicated address bus (A0–A13), HIGH selects ADM (address/data multiplexed) mode using the I/O bus for address input. This eliminates external interface logic and enables flexible system topology without redesign.

How does mailbox interrupt generation work in CYDMX256A16?

Writing to address 0x3FFF triggers INT#L; writing to 0x3FFE triggers INT#R. The interrupt remains asserted until the owning port reads its respective mailbox address. Concurrent BUSY# assertion prevents interrupt setting or clearing - ensuring atomicity during memory contention.

Can CYDMX256A16 operate with different I/O voltages on left and right ports?

Yes - VDDIOL and VDDIOR are independent power pins supporting 1.8 V, 2.5 V, or 3.0 V LVCMOS/LVTTL levels per port. This allows direct interfacing with heterogeneous processors (e.g., 1.8 V FPGA + 3.0 V MCU) without level-shifting circuitry.

Is CYDMX256A16 still in active production despite the "OBSOLETE" note in its spec sheet?

Yes - Infineon confirms continued manufacturing and supply of CYDMX256A16 under its active portfolio. The "OBSOLETE" label refers only to the document revision status, not product discontinuation; ordering part numbers remain unchanged and supported per Infineon's continuity policy.