Infineon Technologies CY7C136-55JXCT

Overview

CY7C136-55JXCT from Cypress Semiconductor is a 2K × 8 true dual-port static RAM with independent left/right ports, 55 ns maximum access time, 5 V ±10% supply, and 52-pin PLCC package. It supports simultaneous read access to the same memory location, features BUSY arbitration and INT flags for inter-port communication, and operates in industrial temperature range (–40 °C to +85 °C) - used in multiprocessor cache buffers and DSP shared-memory subsystems.

For engineers reviewing the CY7C136-55JXCT datasheet, CY7C136-55JXCT pinout, CY7C136-55JXCT application, or CY7C136-55JXCT equivalent, key selection criteria include dual-port arbitration timing (tBLA = 30 ns), standby current (ISB1 = 35 mA), BUSY open-drain output requirement, and compatibility with CY7C146 slave devices for 16-bit expansion.

Technical Context

This device implements fully asynchronous dual-port SRAM architecture with separate address, data, and control buses per port (left/right). Each port has dedicated CE, R/W, and OE pins, enabling independent read/write cycles without internal synchronization overhead.

Arbitration logic resolves contention when both ports access the same address: BUSY asserts low on the contending port, while INT signals interrupt events at fixed locations (7FFH left, 7FEH right). Power-down is controlled per port via CE, supporting ISB3 = 15 mA CMOS-input standby mode.

Key Specifications

Pinout & Package

Package: 52-pin Plastic Leaded Chip Carrier (PLCC), JEDEC MS-026AC compliant, lead-free (Pb-free) variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C136A-55JXCT, this part offers identical functionality but may differ in manufacturing lot and qualification history; versus CY7C146-55JXCT, it provides full master arbitration capability essential for standalone dual-processor designs.

Availability

CY7C136-55JXCT is available at Aetrix Electronics and suitable for industrial control systems, real-time DSP subsystems, and multiprocessor communication interfaces requiring stable component supply across extended lifecycle programs.

Supply support for CY7C136-55JXCT 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-performance memory and programmable solutions for embedded systems, emphasizing reliability and industrial temperature operation.

CY7C136 belongs to Cypress's legacy dual-port SRAM product line, engineered specifically for deterministic inter-processor communication and real-time shared-memory architectures in telecom, test equipment, and automation.

FAQ

Is CY7C136-55JXCT pin-compatible with CY7C136A-55JXCT?

Yes - CY7C136-55JXCT and CY7C136A-55JXCT are functionally and physically identical per Cypress datasheet Rev. *H Note 1. Both use the same 52-pin PLCC package, share identical pinout, timing specifications, and electrical characteristics, and may be substituted without design modification.

What external components are required for BUSY signal operation?

BUSYL and BUSYR are open-drain outputs requiring external pull-up resistors to VCC. Cypress recommends a 4.7 kΩ resistor per BUSY line; values between 2.2 kΩ and 10 kΩ are acceptable depending on rise-time and bus capacitance requirements.

Can CY7C136-55JXCT operate at 3.3 V?

No - CY7C136-55JXCT is specified only for 5 V ±10% (4.5–5.5 V) operation. Its internal logic thresholds, output drive strength, and timing parameters are not characterized for 3.3 V supply; use of lower voltage risks timing violations and functional failure.

How does the INT flag reset after assertion?

INTL and INTR are reset by toggling the corresponding OE pin (OEL or OER) from low to high. This behavior is documented in the Interrupt Timing table (tOINR = 45 ns max) and applies exclusively to the 52-pin PLCC and PQFP versions.