Renesas 7024L55J8

Overview

7024L55J8 from IDT is a high-speed 4K × 16 true dual-port static RAM with independent left/right ports, 55 ns maximum read cycle time, TTL-compatible 5V ±10% supply, and battery backup data retention down to 2V. It supports master/slave cascading for 32-bit+ bus expansion and implements on-chip semaphore arbitration for inter-processor communication in real-time embedded systems.

For engineers reviewing the 7024L55J8 datasheet, 7024L55J8 pinout, 7024L55J8 application, or 7024L55J8 equivalent, this page delivers verified specifications including BUSY/INT flag timing, byte-select control (UBL/LBL), semaphore enable (SEML/SEMR), and industrial-grade –40°C to +85°C operation - critical for selecting dual-port memory in deterministic multi-CPU architectures.

Technical Context

The 7024L55J8 implements fully asynchronous dual-port access with separate address, control, and I/O buses per port, enabling simultaneous reads from the same memory location. Its on-chip arbitration logic resolves contention via BUSY flag signaling and supports both master (BUSY output) and slave (BUSY input) configurations using the M/S pin.

It integrates full hardware semaphore support: eight flags addressed by A0–A2, accessed via SEM = VIL with CE or UB/LB high. The device operates in two distinct modes - RAM access (SEM = VIH) and semaphore access (SEM = VIL) - with dedicated timing parameters (tSAA, tSWRD, tSPS) validated for cross-port synchronization.

Key Specifications

Pinout & Package

7024L55J8 is packaged in a 100-pin TQFP (PNG100) with 0.5 mm pitch, 14 mm × 14 mm body, and 1.4 mm height. Pin 1 is marked by a dot; pin numbering follows standard counter-clockwise convention starting at top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C136-55JC and AS7C34096B-55JC, the 7024L55J8 uniquely integrates master/slave arbitration, hardware semaphores, and BUSY flag signaling - delivering plug-and-play deterministic inter-processor communication without external components or software overhead.

Availability

7024L55J8 is available at Aetrix Electronics and suitable for industrial PLC controllers, aerospace avionics interfaces, medical imaging subsystems, and telecom baseband processors requiring stable component supply across extended product lifecycles.

Supply support for 7024L55J8 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

IDT (Integrated Device Technology) is a fabless semiconductor company specializing in timing, memory interface, RF, and high-performance interconnect solutions, now part of Renesas Electronics.

The IDT7024 family was designed specifically for deterministic, low-latency inter-processor communication in real-time embedded systems - emphasizing hardware arbitration, battery-backed retention, and seamless bus-width scalability.

FAQ

What is the guaranteed maximum access time for 7024L55J8 under industrial temperature conditions?

The 7024L55J8 guarantees a maximum read cycle time (tRC) of 55 ns over the full industrial temperature range (–40°C to +85°C) with VCC = 5.0 V ±10%. This specification is production-tested and applies to both ports independently under worst-case voltage and temperature conditions.

Does 7024L55J8 support true simultaneous read operations from both ports to the same memory address?

Yes, the 7024L55J8 implements true dual-ported memory cells that allow concurrent reads from identical addresses on the left and right ports without contention or timing penalty - a core architectural feature confirmed in the functional description and block diagram.

How does the M/S pin affect BUSY signal behavior in 7024L55J8?

When M/S = H, 7024L55J8 operates as Master: BUSYL/BUSYR are outputs asserting active-high during port contention. When M/S = L, it operates as Slave: BUSYL/BUSYR become inputs used to stall local writes - enabling hardware-synchronized arbitration in cascaded configurations.

Can 7024L55J8 retain data during main power loss using a 2V backup supply?

Yes, the 'L' suffix denotes low-power capability: 7024L55J8 maintains valid data at VCC = 2.0 V minimum, with typical data retention current of 100 µA (max 4000 µA) across military and industrial grades - enabling reliable battery-backed operation without external supervision circuitry.

What package type is used for the 7024L55J8 variant?

The 7024L55J8 uses a 100-pin Thin Quad Flatpack (TQFP) package (IDT package code PNG100), measuring 14 mm × 14 mm with 0.5 mm lead pitch - confirmed in the Pin Configurations section and ordering information diagrams.