Infineon Technologies CY7C146-55JXC

Overview

CY7C146-55JXC from Cypress Semiconductor is a 2K × 8 dual-port static RAM configured as a slave device in master–slave memory expansion architectures, supporting simultaneous independent access on left and right ports with 55 ns maximum access time, 110 mA max operating current, and BUSY input arbitration logic - used in multiprocessor cache buffers and DSP shared-memory subsystems.

For engineers reviewing the CY7C146-55JXC datasheet, CY7C146-55JXC pinout, CY7C146-55JXC application, or CY7C146-55JXC equivalent, key selection criteria include its role as a slave dual-port SRAM with BUSY-input arbitration, 52-pin PLCC package compatibility, 5 V ±10% supply, and support for 16-bit+ data bus expansion via CY7C136/CY7C136A master pairing.

Technical Context

This device implements fully asynchronous dual-port architecture with independent CE, R/W, and OE controls per port, enabling concurrent read/write operations across two address spaces. It lacks internal arbitration logic and relies on external BUSY signaling from a master (e.g., CY7C136) to resolve contention.

The 52-pin PLCC package supports both commercial (0°C to +70°C) and industrial (–40°C to +85°C) temperature ranges, with CMOS-compatible inputs, open-drain BUSY input requiring external pull-up, and interrupt flag (INT) support for port-to-port communication at fixed addresses (7FFH/7FEH).

Key Specifications

Pinout & Package

Package: 52-pin PLCC (Plastic Leaded Chip Carrier), 19.1 mm × 19.1 mm body, 0.5 mm lead pitch, JEDEC MS-026AC compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C146-55JXI, the JXC variant trades temperature margin for lower cost and qualification scope; versus IDT70V25L25PF, it preserves 5 V compatibility and seamless master–slave integration but sacrifices speed and density.

Availability

CY7C146-55JXC is available at Aetrix Electronics and suitable for real-time DSP shared memory, multiprocessor cache coherence, and bit-slice processor interconnect applications requiring stable component supply and long-term industrial availability.

Supply support for CY7C146-55JXC 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 memory, PSoC, USB, and clock solutions for industrial, automotive, and communications markets.

CY7C146 belongs to Cypress's legacy dual-port SRAM product line, designed specifically for 5 V master–slave memory expansion in multiprocessor, DSP, and bit-slice systems requiring deterministic arbitration and low-latency shared access.

FAQ

Is CY7C146-55JXC pin-compatible with CY7C136-55JXC?

No - CY7C146-55JXC is a slave device with BUSY input pins (Pins 43, 5), while CY7C136-55JXC is a master with BUSY open-drain outputs (same pins). Their pin functions differ at BUSY/INT locations, making direct substitution electrically unsafe without board redesign.

Can CY7C146-55JXC operate with a 3.3 V supply?

No - the device is specified only for 5 V ±10% (4.5–5.5 V). Applying 3.3 V violates absolute maximum ratings and will prevent proper CMOS threshold operation, resulting in undefined outputs and potential latch-up.

Does CY7C146-55JXC support independent power-down on each port?

Yes - asserting CE HIGH on either port (CEL or CER) disables its I/O drivers and reduces that port's current draw to standby levels (ISB2 = 75 mA typ.), while the other port remains fully operational and accessible.

What is the function of the INT pin on CY7C146-55JXC?

The INT pin is an open-drain interrupt output that asserts LOW when data is written to dedicated addresses 7FFH (left port) or 7FEH (right port), enabling hardware-triggered notification between processors without polling or shared memory scanning.