Renesas 7024L55J

Overview

7024L55J from IDT is a high-speed 4K × 16 true dual-port static RAM with independent left/right ports, 55 ns max read cycle time, TTL-compatible 5V ±10% supply, and 2V data retention for battery backup operation. It supports simultaneous asynchronous access to the same memory location and implements on-chip semaphore arbitration for inter-processor communication in real-time embedded systems.

For engineers reviewing the 7024L55J datasheet, 7024L55J pinout, 7024L55J application, or 7024L55J equivalent, key selection criteria include dual-port arbitration timing (tBDD ≤ 30 ns), low standby current (1 µA typical), 100-pin TQFP package compatibility, and industrial temperature range support (–40°C to +85°C).

Technical Context

The 7024L55J implements full hardware port arbitration with dedicated BUSY flag signaling and master/slave configuration via M/S pin. Its dual-port architecture enables concurrent read/write operations without external logic, using separate address, control, and I/O buses per port.

It integrates on-chip semaphore logic accessible via A0–A2 addressing and I/O0–I/O15 data lines, supporting eight independent flags. The device operates fully asynchronously-no clock required-and enters ultra-low-power standby (1 µA typ.) when both chip enables are deasserted with CMOS-level inputs.

Key Specifications

Pinout & Package

7024L55J is packaged in a 100-pin Thin Quad Flatpack (TQFP), body size 14 mm × 14 mm × 1.4 mm, lead pitch 0.5 mm, RoHS-compliant and green-part qualified.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C136-55JC and AS7C34098B-55JC, the 7024L55J uniquely delivers integrated semaphore arbitration, master/slave configurability, and industrial-grade reliability-making it the only option that eliminates external logic for deterministic multi-processor memory sharing.

Availability

7024L55J is available at Aetrix Electronics and suitable for real-time industrial PLCs, avionics data buffering, medical imaging subsystems, and test & measurement equipment requiring stable component supply across extended product lifecycles.

Supply support for 7024L55J 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 sensor solutions, now part of Renesas Electronics.

The 7024L55J belongs to IDT's legacy high-speed dual-port SRAM product line, engineered for deterministic inter-processor communication in mission-critical embedded systems where hardware arbitration and data retention are mandatory.

FAQ

What is the maximum operating temperature range for the 7024L55J?

The 7024L55J is rated for industrial temperature operation from –40°C to +85°C, with all DC and AC electrical specifications guaranteed across this full range. This makes it suitable for deployment in harsh environments such as factory automation controllers and outdoor telecommunications equipment where ambient thermal stress is significant. The device meets MIL-PRF-38535 QML requirements for reliability assurance.

Does the 7024L55J support battery backup operation, and what voltage is required?

Yes, the 7024L55J supports battery backup operation with guaranteed data retention at VCC = 2.0 V minimum. In retention mode, it draws only 100 µA typical (up to 4 mA max) while preserving memory contents indefinitely. This feature is exclusive to the "L" (low-power) variant and enables fail-safe state preservation during main power loss in critical systems like medical devices and avionics.

How does the M/S pin configure master vs. slave behavior in the 7024L55J?

When M/S = HIGH, the 7024L55J operates as a master: BUSYL and BUSYR become push-pull outputs indicating port contention. When M/S = LOW, it operates as a slave: BUSYL and BUSYR become inputs accepting BUSY signals from a master device. This configuration enables seamless cascading of multiple 7024L55J devices to build wider memory interfaces (e.g., 32-bit or 64-bit) without external arbitration logic.

What is the purpose of the semaphore function in the 7024L55J, and how is it accessed?

The 7024L55J integrates eight hardware semaphore flags used for inter-processor synchronization. They are accessed by setting SEM = LOW while holding CE and byte enables HIGH, then using A0–A2 to select the flag and I/O0–I/O15 to read/write its state. This eliminates software-based locking mechanisms and reduces inter-core communication latency to under 5 ns, critical for real-time deterministic systems.

Can the 7024L55J be used in systems requiring RoHS compliance and green manufacturing standards?

Yes, the 7024L55J is manufactured as a green part compliant with RoHS Directive 2011/65/EU and halogen-free standards. The 100-pin TQFP package uses lead-free terminations and meets JEDEC J-STD-020 moisture sensitivity level 3 (MSL3) requirements. Full compliance documentation-including material declarations and process certifications-is available through IDT/Renesas upon request.