Renesas 7024L20J

Overview

7024L20J 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 standby power, TTL-compatible 5V ±10% supply, and on-chip semaphore arbitration-designed for real-time inter-processor communication in embedded control systems.

For engineers reviewing the 7024L20J datasheet, 7024L20J pinout, 7024L20J application, or 7024L20J equivalent, key selection criteria include dual-port contention resolution timing (tBDD ≤ 30 ns), battery-backed data retention at 2V, master/slave BUSY flag coordination, and compatibility with 84-pin PLCC packaging for legacy industrial backplanes.

Technical Context

The 7024L20J implements fully asynchronous dual-port operation with separate address, control, and I/O buses per port, enabling simultaneous read/write to the same memory location without external logic. Its on-chip arbitration logic resolves port conflicts via BUSY flag assertion and supports semaphore signaling across both ports using A0–A2 addressing and I/O0–I/O15 data lines.

It features two distinct operational modes: RAM access (CE = VIL, UB/LB = VIL, SEM = VIH) and semaphore register access (CE = VIH or UB&LB = VIH, SEM = VIL), with dedicated timing parameters (e.g., tSAA ≤ 20 ns, tSWRD = 5 ns) validated for both commercial and industrial temperature ranges (–40°C to +85°C).

Key Specifications

Pinout & Package

7024L20J is packaged in an 84-pin Plastic Leaded Chip Carrier (PLCC) with 0.050" lead pitch and 1.15" × 1.15" body size. Pin 1 is marked by a corner notch; all VCC pins require local decoupling, and all GND pins must be connected to system ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C024AV-20AXC and IDT70V24L20PF, the 7024L20J uniquely delivers 5V-native operation, 2V battery retention, and 84-pin PLCC compatibility - making it the sole option for drop-in replacement in existing industrial 5V backplane designs requiring zero layout change.

Availability

7024L20J is available at Aetrix Electronics and suitable for industrial PLCs, avionics data loggers, and dual-CPU embedded controllers requiring stable component supply across extended product lifecycles.

Supply support for 7024L20J 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, now part of Renesas Electronics since 2019.

The IDT7024 family was engineered for deterministic inter-processor communication in real-time embedded systems, emphasizing hardware arbitration, low-latency dual-port access, and industrial reliability - not general-purpose memory expansion.

FAQ

What is the maximum operating temperature range certified for the 7024L20J?

The 7024L20J is rated for industrial temperature operation from –40°C to +85°C. This specification is verified per manufacturer datasheet Table 2 and applies to all AC and DC electrical parameters under 5.0 V ±10% supply conditions. It is not qualified for military-grade (–55°C to +125°C) use.

Does the 7024L20J support battery backup data retention, and at what voltage?

Yes, the 7024L20J supports data retention at 2.0 V minimum supply voltage (VDR = 2.0 V), with typical retention current ICCDR ≤ 100 µA. This capability is exclusive to the "L" (low-power) variant and is confirmed in datasheet Table 10 under Data Retention Characteristics.

How does the M/S pin configure master versus slave operation in the 7024L20J?

When M/S = HIGH, the 7024L20J operates as Master: BUSYL and BUSYR become output signals indicating port contention. When M/S = LOW, it operates as Slave: BUSYL and BUSYR become inputs, allowing external arbitration from a master device. This is defined in the Functional Description section and Pin Names table.

What package type is used for the 7024L20J, and are there alternate packages?

The 7024L20J uses an 84-pin Plastic Leaded Chip Carrier (PLCC) package, as confirmed in the Pin Configurations diagram (drawing 2740 drw 02F). While the IDT7024 family also offers PGA, Flatpack, and 100-pin TQFP variants, the "J" suffix specifically denotes the PLCC configuration.

Can the 7024L20J perform simultaneous read operations on both ports to the same memory address?

Yes, the 7024L20J supports true simultaneous reads to the same address on both ports without conflict or timing penalty. This is enabled by its true dual-port memory cell architecture, explicitly stated in the Features section and validated by tOH = 3 ns and tAA ≤ 20 ns timing parameters for independent port operation.