Infineon Technologies CY7C141-25JC

Overview

CY7C141-25JC from Cypress Semiconductor is a 1K × 8 true dual-port static RAM with independent left/right ports, 25 ns access time, 5 V ±10% supply, and 52-pin PLCC package. It functions as a slave device in 16-bit+ bus expansion systems alongside CY7C131 master RAMs, enabling simultaneous read/write access to shared memory in multiprocessor or DSP cache architectures.

For engineers reviewing the CY7C141-25JC datasheet, CY7C141-25JC pinout, CY7C141-25JC application, or CY7C141-25JC equivalent, key selection criteria include BUSY input arbitration support, INT flag for port-to-port signaling, automatic per-port power-down, and compatibility with IDT7140-based designs requiring 1K×8 dual-port SRAM in industrial temperature range (–40°C to +85°C).

Technical Context

The CY7C141-25JC implements fully asynchronous dual-port architecture with separate address, data, and control lines for left (L) and right (R) ports. Each port features independent CE, R/W, and OE pins, enabling concurrent access without internal arbitration logic - arbitration is handled externally via BUSY/INT signals.

As a slave device, it accepts BUSY input (not output) and supports interrupt-driven communication using dedicated INT flag locations (3FFH for left port, 3FEH for right port). Its 0.65-µm CMOS process delivers low standby current (35 mA max at commercial temp) and supports TTL/CMOS-compatible input thresholds (VIH = 2.2 V, VIL = 0.8 V).

Key Specifications

Pinout & Package

Package: 52-pin Plastic Leaded Chip Carrier (PLCC), JEDEC MS-026AC compliant, surface-mountable with gull-wing leads. Thermal resistance θJA ≈ 50°C/W (typical for PLCC-52 in still air).

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT7140SA25JG, CY7C141-25JC requires an external master for arbitration but offers lower system-level cost and simpler layout; compared with CY7C141-25JI, it trades extended temperature tolerance for lower procurement cost and broader commercial availability.

Availability

CY7C141-25JC is available at Aetrix Electronics and suitable for DSP cache memory, multiprocessor shared buffers, bit-slice processor interfaces, and legacy bus expansion modules requiring stable component supply and long-term obsolescence management.

Supply support for CY7C141-25JC 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 founded in 1982, specializing in programmable system-on-chip, memory, and USB solutions for industrial and automotive markets.

The CY7C141 belongs to Cypress's legacy dual-port SRAM product line, designed specifically for high-reliability embedded systems requiring deterministic, low-latency shared memory between heterogeneous processors or functional blocks.

FAQ

Is CY7C141-25JC pin-compatible with CY7C140-25JC?

Yes - both share identical 52-pin PLCC pinout and electrical specifications. The only difference is temperature grade: CY7C140-25JC is commercial (0°C to +70°C), while CY7C141-25JC is industrial (–40°C to +85°C). No PCB or firmware changes are needed for substitution within the supported temperature envelope.

What is the function of the BUSY pin on CY7C141-25JC?

BUSY is a dedicated input pin (not output) that receives arbitration signals from a master dual-port RAM (e.g., CY7C131). When asserted LOW, it forces the CY7C141-25JC to suspend its current access attempt until BUSY returns HIGH, preventing simultaneous writes to the same memory location and ensuring data integrity in multi-master systems.

Can CY7C141-25JC operate with 3.3 V I/O levels?

No - CY7C141-25JC is strictly a 5 V device. Its VIH minimum is 2.2 V and VIL maximum is 0.8 V, which align with TTL logic thresholds but do not meet 3.3 V LVTTL or LVCMOS requirements. Direct interface with 3.3 V controllers requires level-shifting circuitry on all address, data, and control lines.

How does the INT flag work in CY7C141-25JC?

The INT flag is an open-drain interrupt output activated when data is written to specific reserved addresses: 3FFH (left port) or 3FEH (right port). Writing to either location asserts INTR or INTL, respectively, allowing one port to signal event completion or request service from the other port without polling or shared semaphore overhead.