Infineon Technologies CY7C007A-20JXC

Overview

CY7C007A-20JXC from Cypress Semiconductor is a 32K × 8 true dual-port static RAM with independent left/right ports, 20 ns access time, 5 V supply, and on-chip arbitration logic for interprocessor communication in real-time embedded systems.

For engineers reviewing the CY7C007A-20JXC datasheet, CY7C007A-20JXC pinout, CY7C007A-20JXC application, or CY7C007A-20JXC equivalent, key selection considerations include simultaneous port access timing, BUSY/INT/SEM signal coordination, master/slave expansion capability, and PLCC-68 thermal and layout compatibility.

Technical Context

This device implements fully asynchronous dual-port SRAM architecture with separate address, data, and control buses per port (A0L–A14L/I/O0L–I/O7L/CEL/OEL/R/WL/BUSYL/INTL/SEML and mirrored right-side signals), enabling deterministic contention resolution via hardware BUSY arbitration within tPS = 10 ns.

It integrates eight dedicated semaphore latches accessible via SEM pin with A0–A2 addressing, supporting software-controlled resource locking across ports; M/S pin configures BUSY as output (master) or input (slave) to enable 16-bit+ memory expansion without external logic.

Key Specifications

Pinout & Package

Package: 68-pin Plastic Leaded Chip Carrier (PLCC), JEDEC MS-026AC compliant, body size 24.2 mm × 24.2 mm, lead pitch 1.27 mm, suitable for through-hole reflow or socketed prototyping.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT70V27L20PF and CY7C028V-20AC, CY7C007A-20JXC offers direct 5 V compatibility, PLCC-68 socketability for legacy test fixtures, and proven arbitration behavior in long-lifecycle industrial designs - making it optimal for cost-sensitive, field-upgradeable 5 V systems where footprint and voltage alignment outweigh density gains.

Availability

CY7C007A-20JXC is available at Aetrix Electronics and suitable for real-time interprocessor communication, dual-port video buffering, and industrial PLC data exchange requiring stable component supply over extended production lifecycles.

Supply support for CY7C007A-20JXC 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 U.S.-based semiconductor company specializing in programmable solutions for embedded systems, USB, memory, and analog applications.

CY7C007A belongs to Cypress's legacy dual-port SRAM product line, designed specifically for deterministic, low-latency memory sharing between heterogeneous processors in aerospace, industrial automation, and communications equipment.

FAQ

What is the function of the M/S pin on CY7C007A-20JXC?

The M/S pin configures the device as master (M/S = HIGH) or slave (M/S = LOW). In master mode, BUSYL and BUSYR are outputs that drive slave devices' BUSY inputs; in slave mode, they become inputs. This enables automatic 16-bit+ memory expansion without external glue logic or discrete master/slave pairing.

How does semaphore operation prevent race conditions between ports?

Semaphores use eight dedicated latches accessed via SEML/SEMR. Writing '0' to a semaphore location atomically reserves it; reading returns '0' if acquired or '1' if contested. The latch state is visible to both ports but modifiable by only one side at a time, enforcing mutual exclusion without software polling loops or critical sections.

Can CY7C007A-20JXC operate with mixed voltage interfaces (e.g., 3.3 V controller + 5 V SRAM)?

No - CY7C007A-20JXC requires 5 V ±10% VCC and specifies VIH = 2.2 V, VIL = 0.8 V. While 3.3 V logic outputs may meet VIH, they risk violating VOL/VOL margins under capacitive load. Level-shifting or buffer ICs are required for reliable interfacing with 3.3 V controllers.

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

On-chip arbitration asserts BUSYL and BUSYR within tBLA (≤12 ns) to stall the losing port. The winning port completes its write; the losing port's BUSY remains active until the winning port releases the address. Data integrity is preserved - no bus contention or undefined states occur at the I/O pins.