Renesas 7024S20J8

Overview

7024S20J8 from IDT is a high-speed 4K × 16 true dual-port static RAM with independent left/right ports, 20 ns max access time (commercial/industrial), TTL-compatible 5V ±10% supply, and on-chip semaphore arbitration logic - used in real-time inter-processor communication systems requiring simultaneous read/write access to shared memory.

For engineers reviewing the 7024S20J8 datasheet, 7024S20J8 pinout, 7024S20J8 application, or 7024S20J8 equivalent, key selection considerations include BUSY flag arbitration timing (tBAA ≤ 20 ns), dual-port power-down modes (ISB3 ≤ 0.2 mA for L-version), and 84-pin PLCC package compatibility with legacy military-industrial backplane designs.

Technical Context

The 7024S20J8 implements fully asynchronous dual-port operation with separate address, control, and I/O buses per port, enabling concurrent reads/writes to any memory location without external logic. Its on-chip arbitration logic resolves port contention via MASTER/SLAVE configuration using the M/S pin, where BUSY output (MASTER) signals write conflict to the SLAVE port.

It supports semaphore signaling across ports using dedicated SEM pins and A0–A2 address lines to manage eight shared resource flags. Battery backup data retention at 2V (IDT7024L variant) is enabled by low-leakage CMOS design, though the S-suffix indicates standard-power operation with 750 mW typical active power.

Key Specifications

Pinout & Package

7024S20J8 is packaged in an 84-pin Plastic Leaded Chip Carrier (PLCC), body size ≈ 1.15 in × 1.15 in × 0.17 in, with gull-wing leads and standard JEDEC MO-047A outline. Pin 1 is marked by a corner notch; all VCC and GND pins must be connected per datasheet note.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C024AV-20JC and R1LV0416ASBG-20SI, the 7024S20J8 uniquely integrates port arbitration, semaphore registers, and MASTER/SLAVE configuration in a single 84-pin PLCC package - reducing system latency, component count, and layout complexity for deterministic multi-processor memory sharing.

Availability

7024S20J8 is available at Aetrix Electronics and suitable for real-time inter-processor communication, digital signal processing buffering, and avionics flight control interface applications requiring stable component supply, long-term lifecycle support, and industrial-temperature reliability.

Supply support for 7024S20J8 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 IDT7024 family was designed specifically for deterministic, low-latency inter-processor communication in military, aerospace, and industrial control systems - emphasizing hardware arbitration, semaphore support, and robust packaging.

FAQ

What is the maximum operating frequency supported by the 7024S20J8?

The 7024S20J8 has a 20 ns maximum access time, enabling reliable operation at up to 50 MHz in read/write cycles (1/20 ns = 50 MHz). Its asynchronous architecture means no internal clock is required - timing depends solely on external control signal setup/hold and propagation delays, making it suitable for mixed-frequency system designs.

Does the 7024S20J8 support battery backup operation?

The 7024S20J8 is the standard-power variant (S-suffix) and does not guarantee 2V data retention; that feature is specified for the IDT7024L series. However, its underlying CMOS cell design supports low-leakage standby modes (ISB3 ≤ 0.2 mA), and many users implement external 2V backup supplies with appropriate voltage monitoring circuitry.

How does the M/S pin affect arbitration behavior in the 7024S20J8?

When M/S = H, the 7024S20J8 operates as MASTER: BUSYR outputs a conflict flag to the slave device. When M/S = L, it operates as SLAVE: BUSYL accepts the BUSY signal as input to inhibit writes. This pin configures hardware-level priority - the MASTER always wins arbitration, eliminating need for software-based tie-breaking.

Can the 7024S20J8 be used in a 32-bit data bus configuration?

Yes - the 7024S20J8 supports 32-bit expansion via MASTER/SLAVE cascading. Two devices can be connected with M/S pins set oppositely; the MASTER's BUSYR drives the SLAVE's BUSYL, enabling coordinated access. The datasheet confirms this topology eliminates need for external logic in wide-bus memory systems.

What package type is used for the 7024S20J8?

The 7024S20J8 uses an 84-pin Plastic Leaded Chip Carrier (PLCC) package, per IDT documentation and ordering code suffix 'J8'. This surface-mount package features gull-wing leads, JEDEC MO-047A outline, and is compatible with standard reflow soldering processes used in industrial PCB assembly.