Infineon Technologies CY7C006A-20AXCT

Overview

CY7C006A-20AXCT from Cypress Semiconductor is a 16K × 8 true dual-port static RAM with independent left/right address, data, and control buses, 20 ns access time, 180 mA typical active current, and on-chip arbitration logic for simultaneous memory access resolution - used in interprocessor communication buffers and dual-ported video frame stores.

For engineers reviewing the CY7C006A-20AXCT datasheet, CY7C006A-20AXCT pinout, CY7C006A-20AXCT application, or CY7C006A-20AXCT equivalent, key selection considerations include BUSY/INT/SEM signal timing, master/slave expandability, asynchronous port independence, and CMOS-level standby current (0.05 mA).

Technical Context

The device implements fully asynchronous dual-port operation with separate CE/OE/R/W controls per port, enabling non-contending reads/writes across independent address spaces. Arbitration is handled by on-chip logic that asserts BUSY when both ports attempt access to the same location within tPS (15 ns), resolving contention without external logic.

It integrates eight dedicated semaphore latches accessible via SEM pin, supporting software handshaking between ports; interrupt flags (INTL/INTR) are tied to memory-mapped mailboxes at addresses 3FFEh (left) and 3FFFh (right), with auto-clear on read.

Key Specifications

Pinout & Package

Available in 68-pin PLCC and 64-pin TQFP packages; CY7C006A-20AXCT corresponds to the 68-pin PLCC variant (lead-free, RoHS-compliant).

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT70V27L-20PF and IS61LV25616AL-20TQLI, CY7C006A-20AXCT uniquely delivers 5 V compatibility, integrated arbitration, hardware semaphores, and master/slave expandability - reducing BOM count and firmware complexity in tightly coupled dual-processor systems.

Availability

CY7C006A-20AXCT is available at Aetrix Electronics and suitable for interprocessor communication buffers, dual-port video frame stores, communications protocol stack buffers, and industrial PLC shared data memory requiring stable component supply and long-term lifecycle support.

Supply support for CY7C006A-20AXCT 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 embedded and industrial applications, with global manufacturing and quality certification to ISO 9001 and AEC-Q200.

The CY7C006A belongs to Cypress's legacy dual-port SRAM product line, engineered specifically for deterministic, low-latency inter-processor data exchange in real-time control and graphics systems.

FAQ

What is the function of the M/S pin in CY7C006A-20AXCT?

The M/S pin configures the device as master (M/S = HIGH) or slave (M/S = LOW). In master mode, BUSY pins are outputs that drive slave BUSY inputs; in slave mode, BUSY pins become inputs accepting arbitration signals from the master. This enables seamless 16-bit+ data bus expansion without external logic or timing compensation.

How does semaphore operation prevent resource conflicts between ports?

Semaphore latches (eight total) are accessed via SEM pin and A0–A2. Writing '0' to a semaphore grants exclusive ownership; reading returns '0' if acquired or '1' if contested. The latch state is mirrored across ports, ensuring only one side can modify it - enforcing atomic resource allocation without software polling loops or race conditions.

Can CY7C006A-20AXCT operate with mixed voltage interfaces (e.g., 5 V core, 3.3 V I/O)?

No. CY7C006A-20AXCT is specified for 5 V ±10% VCC only. All I/O pins (including CE, OE, R/W, INT, BUSY) are TTL-compatible with VIH ≥ 2.2 V and VIL ≤ 0.8 V. Interfacing with 3.3 V logic requires level-shifting circuitry to avoid violating input voltage ratings.

What happens when both ports attempt to write to the same address simultaneously?

On-chip arbitration asserts BUSY on the losing port within 15 ns (tPS) of address match. The winning port gains immediate access; the losing port must wait until BUSY deasserts before retrying. No data corruption occurs - the memory cell retains the value written by the winning port, and the losing port's write is ignored.