Renesas 7024S15J

Overview

7024S15J from IDT is a high-speed 4K × 16 true dual-port static RAM with 15 ns maximum read cycle time, TTL-compatible 5V ±10% supply, and independent left/right ports enabling simultaneous asynchronous access to the same memory location. It supports master/slave cascading for 32-bit+ bus expansion and includes on-chip semaphore logic and BUSY arbitration for real-time inter-processor communication in embedded control systems.

For engineers reviewing the 7024S15J datasheet, 7024S15J pinout, 7024S15J application, or 7024S15J equivalent, this device is selected for deterministic low-latency shared-memory architectures requiring hardware-enforced port arbitration, battery-backed data retention down to 2V, and industrial temperature operation (–40°C to +85°C) in avionics, motor control, and digital signal processing subsystems.

Technical Context

The 7024S15J implements fully asynchronous dual-port operation with separate address, control, and I/O buses per port-enabling concurrent reads/writes without external logic. Its on-chip arbitration logic resolves contention via BUSY flag signaling and priority-based semaphore management across eight programmable flags addressed by A0–A2.

It features two independent power-down modes: TTL-level standby (ISB1 = 20 mA typ.) and CMOS-level full standby (ISB3 = 1.0 mA typ.), plus 2V battery backup data retention (ICCDR ≤ 1500 µA). The device uses CMOS high-performance fabrication and supports both R/W-controlled and CE/UB/LB-controlled write timing.

Key Specifications

Pinout & Package

7024S15J is packaged in an 84-pin ceramic PGA (GU84) with 0.100" pin spacing and 1.12" × 1.12" footprint. All VCC and GND pins must be externally decoupled; N/C pins are internally unconnected and must remain floating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C133-15VC and IDT70V24S15PF, the 7024S15J uniquely delivers integrated hardware semaphore, 2V data retention, and industrial-temperature 5V operation in a PGA package - making it irreplaceable for legacy avionics, motor drives, and safety-critical redundant controllers requiring zero-additional-component dual-port interfacing.

Availability

7024S15J is available at Aetrix Electronics and suitable for motor control systems, avionics flight management units, and industrial PLC redundancy modules requiring stable component supply across extended product lifecycles.

Supply support for 7024S15J 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 memory, timing, and interface solutions for communications, computing, and industrial markets.

The 7024S15J belongs to IDT's legacy dual-port SRAM product line, engineered specifically for deterministic real-time inter-processor communication in safety-critical embedded systems demanding hardware-enforced arbitration and battery-backed state preservation.

FAQ

What is the maximum operating frequency supported by the 7024S15J?

The 7024S15J has a 15 ns maximum read cycle time (tRC), supporting sustained dual-port operation up to 66.7 MHz. This timing applies under commercial conditions (0°C to +70°C) with VCC = 5.0 V ±10%; actual achievable frequency depends on system-level timing margins, PCB layout, and load capacitance, but no external clock is required due to its fully asynchronous architecture.

Does the 7024S15J support battery backup operation, and what is the minimum retention voltage?

Yes, the 7024S15J supports battery backup operation with guaranteed data retention at VCC = 2.0 V. In this mode, the device draws ≤1500 µA (typical) while preserving all 64 Kbits of memory content - critical for maintaining system state during main power failure in avionics and industrial control applications.

How does the BUSY arbitration mechanism work in the 7024S15J?

In master configuration (M/S = H), the 7024S15J asserts BUSY when address contention occurs between ports, blocking writes on the contending port until resolution. In slave mode (M/S = L), BUSY is an input that must be driven high by the master to gate writes - enabling hierarchical arbitration in multi-device cascades without external logic.

Can the 7024S15J perform simultaneous read operations from both ports to the same memory address?

Yes, the 7024S15J uses true dual-port memory cells that allow concurrent reads from identical addresses on left and right ports with no timing penalty or arbitration delay. This capability is fundamental to its use in monitoring, shadowing, and real-time data mirroring applications.

What package type is used for the 7024S15J, and are there thermal or mounting considerations?

The 7024S15J uses an 84-pin ceramic PGA (GU84) package with 0.100" pin pitch and 1.12" × 1.12" body size. It requires standard PGA socket or solder-down mounting; thermal dissipation is managed via its low active power (750 mW typ.) and no heatsink is needed for industrial temperature operation when properly decoupled with 0.1 µF ceramics per VCC pin.