Renesas 7024L15J8

Overview

7024L15J8 from IDT is a high-speed 4K × 16 true dual-port static RAM with independent left/right ports, 15 ns max read cycle time (commercial grade), 2V data retention capability, and full on-chip semaphore and arbitration logic for inter-processor communication in real-time embedded systems.

For engineers reviewing the 7024L15J8 datasheet, 7024L15J8 pinout, 7024L15J8 application, or 7024L15J8 equivalent, key selection criteria include simultaneous asynchronous access support, BUSY/INT flag signaling, byte-selectable I/O control, and low-power standby operation at 1 µA typical - critical for multi-CPU shared-memory architectures requiring deterministic latency and collision-free resource sharing.

Technical Context

The 7024L15J8 implements fully asynchronous dual-port operation with separate address, control, and bidirectional I/O buses per port, enabling concurrent reads/writes to any memory location-including simultaneous reads of the same address. Its on-chip arbitration logic resolves port contention via hardware-enforced priority based on M/S (Master/Slave) configuration and BUSY flag handshaking.

It supports two distinct operational modes: standard RAM access (CE = VIL, SEM = VIH) and semaphore register access (CE = VIH or UB/LB = VIH, SEM = VIL), with dedicated INTL/INTR flags and eight addressable semaphore bits (A0–A2). The device uses TTL-compatible 5V ±10% supply and retains data down to 2V in battery backup mode.

Key Specifications

Pinout & Package

7024L15J8 is packaged in an 84-pin Plastic Leaded Chip Carrier (PLCC, code PLG84), measuring approximately 1.15 in × 1.15 in × 0.17 in, with gull-wing leads and standard JEDEC MO-047A outline. It requires connection of all VCC and GND pins as specified in the pin diagram.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C024AV-15JC and AS7C34098B-15JC, the 7024L15J8 delivers integrated hardware arbitration and semaphore management in the same PLCC package, reducing system-level design complexity and improving real-time determinism without increasing PCB area or component count.

Availability

7024L15J8 is available at Aetrix Electronics and suitable for real-time multi-CPU systems, telecom line card buffering, and industrial PLC memory expansion requiring stable component supply across extended production lifecycles.

Supply support for 7024L15J8 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 silicon solutions for communications, computing, and industrial markets.

The 7024L15J8 belongs to IDT's legacy dual-port SRAM product line, designed specifically for deterministic inter-processor communication in mission-critical embedded systems where hardware-enforced arbitration and low-latency shared memory are essential.

FAQ

What is the maximum operating frequency supported by the 7024L15J8?

The 7024L15J8 does not operate on a clock; it is a fully asynchronous device. Its performance is defined by timing parameters such as tRC (read cycle time) and tWC (write cycle time), both rated at 15 ns maximum for the commercial speed grade. This enables effective operation up to approximately 67 MHz in tightly controlled read/write sequences, though actual system throughput depends on bus protocol overhead and arbitration delays. The 7024L15J8 datasheet specifies no clock input or frequency rating.

Does the 7024L15J8 support battery backup operation, and what voltage is required?

Yes, the 7024L15J8 supports battery backup operation with guaranteed data retention down to 2.0 V (VDR), as confirmed in Table 10 of the official datasheet. In this mode, the device draws only 100 µA typical (ICCDR) while maintaining full memory contents. The L-suffix denotes the low-power variant optimized for this function, and the 7024L15J8 meets this specification across its commercial temperature range (0°C to +70°C).

How does the Master/Slave (M/S) pin affect BUSY signal behavior on the 7024L15J8?

When M/S = H (high), the 7024L15J8 configures as Master: BUSYL and BUSYR become push-pull output signals indicating port contention. When M/S = L (low), it configures as Slave: BUSYL and BUSYR become inputs, allowing external arbitration or daisy-chained BUSY handshaking. This dual-role capability enables flexible cascading - for example, one 7024L15J8 as Master and another as Slave can form a 32-bit wide memory system without external glue logic.

Can the 7024L15J8 perform simultaneous reads from both ports to the same memory address?

Yes, the 7024L15J8 features true dual-ported memory cells that permit simultaneous reads from both the left and right ports to the identical memory location without conflict or timing penalty. This capability is explicitly stated in the "Features" section and is fundamental to its architecture - unlike pseudo-dual-port or pipelined variants, the 7024L15J8 guarantees concurrent access transparency, making it ideal for mirrored data access in redundant control systems.

What package type is used for the 7024L15J8, and are there thermal or mounting considerations?

The 7024L15J8 uses an 84-pin Plastic Leaded Chip Carrier (PLCC) package, designated PLG84, with dimensions of approximately 1.15 in × 1.15 in × 0.17 in. It requires soldering to a PCB with standard PLCC footprint and wave/reflow profiles per JEDEC J-STD-020. Thermal design must account for its 750 mW typical active power dissipation; the datasheet recommends connecting all eight VCC and ten GND pins to minimize impedance and ensure stable operation under full load.