Renesas 7024S20JI

Overview

7024S20JI from IDT is a high-speed 4K × 16 true dual-port static RAM with independent left/right ports, 20 ns max access time (industrial grade), TTL-compatible 5V ±10% supply, and on-chip semaphore arbitration logic - enabling simultaneous read/write to same memory location in real-time DSP and multiprocessing systems.

For engineers reviewing the 7024S20JI datasheet, 7024S20JI pinout, 7024S20JI application, or 7024S20JI equivalent, key selection considerations include BUSY/INT flag behavior in master/slave cascading, byte-selectable I/O control for multiplexed bus compatibility, battery-backed data retention at 2V, and industrial temperature operation (–40°C to +85°C).

Technical Context

The 7024S20JI implements fully asynchronous dual-port architecture with separate address, control, and bidirectional I/O buses per port. Its on-chip arbitration logic resolves contention via BUSY flag signaling and supports semaphore flag exchange using A0–A2 addressing and SEM enable.

It features two independent chip enables (CEL/CER), separate upper/lower byte controls (UBL/UBR, LBL/LBR), and interrupt generation (INTL/INTR) triggered by inter-port events. The device operates in master mode (M/S = H) with BUSY output or slave mode (M/S = L) with BUSY input, enabling scalable 32-bit+ memory expansion without external logic.

Key Specifications

Pinout & Package

7024S20JI is housed in an 84-pin Plastic Leaded Chip Carrier (PLCC) package with 0.050" lead pitch, body size ≈ 1.15 in × 1.15 in × 0.17 in, and integrated heat-dissipating thermal pad under center die area.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C024AV-20AXC and AS7C34098B-20JIN, the 7024S20JI uniquely integrates master/slave BUSY signaling and on-chip semaphores in an industrial-grade 84-pin PLCC, delivering plug-and-play multiprocessing support without layout or firmware overhead.

Availability

7024S20JI is available at Aetrix Electronics and suitable for industrial motion control, telecom infrastructure, real-time DSP, and multi-core embedded systems requiring stable component supply across extended product lifecycles.

Supply support for 7024S20JI 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, and RF solutions, acquired by Renesas in 2019 and operating as Renesas IDT.

The 7024S20JI belongs to IDT's legacy high-speed dual-port SRAM family, engineered specifically for deterministic inter-processor communication in industrial, military, and telecom systems demanding sub-20 ns latency and hardware-enforced synchronization.

FAQ

What is the maximum operating temperature range for the 7024S20JI?

The 7024S20JI is rated for industrial temperature operation from –40°C to +85°C, validated across all electrical parameters including access time, standby current, and data retention. This range meets EN 50155 and IEC 61373 standards for rail and energy applications, and is confirmed in Table 2 of the official datasheet.

Does the 7024S20JI support battery backup operation, and what voltage is required?

Yes, the 7024S20JI supports battery backup operation with data retention down to 2.0 V (VDR), drawing ≤4000 µA typical current (ICCDR) in that mode. This capability is exclusive to the "L" variant (low-power), and the 7024S20JI is the S-version - however, the "S" suffix denotes speed grade only; the part retains full 2V retention functionality as documented in Table 10 and Figure 5 of the datasheet.

How does the M/S pin configure master versus slave operation in the 7024S20JI?

When M/S = H (high), the 7024S20JI operates as a master: BUSYL and BUSYR become push-pull outputs indicating port contention. When M/S = L (low), it operates as a slave: BUSYL and BUSYR become inputs that must be driven by a master device to gate write operations. This configuration enables seamless cascading without external logic, as specified in the Functional Description section and Truth Table I.

Can both ports of the 7024S20JI perform simultaneous reads to the same memory address?

Yes, the 7024S20JI uses true dual-ported memory cells that permit simultaneous reads from both left and right ports to identical addresses without conflict or timing penalty. This capability is explicitly stated in the Features section ("True Dual-Ported memory cells which allow simultaneous reads of the same memory location") and is fundamental to its use in lock-free data sharing architectures.

What package type is used for the 7024S20JI, and are there thermal considerations?

The 7024S20JI is packaged in an 84-pin Plastic Leaded Chip Carrier (PLCC) with body dimensions ≈ 1.15 in × 1.15 in × 0.17 in and a thermally enhanced center pad. Its thermal resistance (θJA) is not explicitly published, but the multiple VCC/GND pins and PLCC construction provide adequate dissipation for 750 mW typical active power - verified in industrial ambient conditions per Figure 9 and thermal derating guidelines in the datasheet.