Renesas 7024L20JI8

Overview

7024L20JI8 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), 1 mW typical standby power, TTL-compatible 5V ±10% supply, and on-chip semaphore arbitration logic-designed for real-time inter-processor communication in embedded control systems.

For engineers reviewing the 7024L20JI8 datasheet, 7024L20JI8 pinout, 7024L20JI8 application, or 7024L20JI8 equivalent, this page delivers verified specifications, validated pin functions, confirmed industrial-temperature operation (–40°C to +85°C), exact package mapping (84-pin PLCC), and two rigorously cross-referenced alternative parts for memory expansion and bus-width scaling designs.

Technical Context

The 7024L20JI8 implements fully asynchronous dual-port architecture with separate address, data, and control buses per port, enabling simultaneous read/write operations-even to the same memory location. Its on-chip arbitration logic resolves contention via BUSY flag signaling and master/slave configuration (M/S pin).

It supports semaphore flag management across both ports using dedicated SEM, INT, and BUSY signals, with full hardware support for eight semaphore registers addressed by A0–A2. Battery backup data retention at 2V is enabled in the L-version, with guaranteed retention current ≤4000 µA over industrial temperature range.

Key Specifications

Pinout & Package

7024L20JI8 is housed in an 84-pin Plastic Leaded Chip Carrier (PLCC, package code PLG84), measuring approximately 1.15 in × 1.15 in × 0.17 in. The package features gull-wing leads, internal heat slug, and dual-row perimeter terminations compatible with JEDEC MO-047B standards.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C136-20JC and IDT70V24L20PF, the 7024L20JI8 uniquely integrates full semaphore arbitration and master/slave BUSY signaling in a drop-in 84-pin PLCC package-reducing component count, eliminating external logic, and preserving existing industrial PCB layouts.

Availability

7024L20JI8 is available at Aetrix Electronics and suitable for industrial automation, avionics data acquisition, and dual-processor embedded control systems requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.

Supply support for 7024L20JI8 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 high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.

The 7024L20JI8 belongs to IDT's legacy dual-port SRAM product line, engineered specifically for deterministic inter-processor communication in real-time embedded systems where hardware arbitration and low-power retention are mandatory.

FAQ

What is the maximum operating temperature range certified for the 7024L20JI8?

The 7024L20JI8 is rated for industrial temperature operation from –40°C to +85°C. This specification is explicitly confirmed in the Absolute Maximum Ratings table and DC Electrical Characteristics section of the official IDT datasheet (document 2740, revision Feb.20.20). It is not rated for commercial (0°C to +70°C) or military (–55°C to +125°C) grades.

Does the 7024L20JI8 support battery backup data retention, and at what voltage?

Yes, the 7024L20JI8 supports battery backup data retention at 2.0 V minimum, as specified in the Data Retention Characteristics table (Table 10). The L-version guarantees retention current ≤4000 µA across the industrial temperature range, enabling reliable operation during main power interruption without external supervision circuitry.

Is the 7024L20JI8 pin-compatible with other members of the IDT7024 family, such as the 7024S20JI8?

Yes, the 7024L20JI8 shares identical pinout, package (84-pin PLCC), and functional interface with all speed- and grade-matched IDT7024 variants-including 7024S20JI8. The 'L' and 'S' suffixes denote standby power differences only (1 mW vs. 5 mW typ), with no changes to pin assignment, timing, or electrical interface.

What arbitration mechanism does the 7024L20JI8 use to resolve simultaneous write conflicts?

The 7024L20JI8 uses hardware-based port arbitration via its BUSY flag signaling and M/S (Master/Slave) configuration. When both ports attempt to write to the same address, the master asserts BUSY to block the slave until completion. This is implemented entirely on-die-no external logic or software intervention is required for conflict resolution.

Can the 7024L20JI8 be used in a 32-bit data bus configuration, and how is that achieved?

Yes, the 7024L20JI8 supports 32-bit bus expansion using the Master/Slave cascade method. Two devices are connected with M/S = HIGH (master) and M/S = LOW (slave); the master's BUSY output connects to the slave's BUSY input. This configuration enables full-speed, error-free 32-bit word access without additional discrete logic, as documented in the IDT7024 functional description.