Renesas 7024S35J

Overview

7024S35J from IDT is a high-speed 4K × 16 true dual-port static RAM with independent left/right ports, 35 ns max read cycle time (tRC), TTL-compatible 5V ±10% supply, and industrial temperature range (–40°C to +85°C). It supports simultaneous asynchronous access, on-chip semaphore arbitration, and battery backup data retention at 2V - used in real-time embedded systems requiring deterministic inter-processor communication.

For engineers reviewing the 7024S35J datasheet, 7024S35J pinout, 7024S35J application, or 7024S35J equivalent, this page delivers verified specifications, validated pin functions for PLCC-84 package, confirmed dual-port arbitration behavior, and two production-validated alternative parts for memory subsystem design and upgrade paths.

Technical Context

The 7024S35J implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port - enabling concurrent read/write operations without external logic. Its on-chip arbitration logic resolves contention via BUSY flag signaling and supports MASTER/SLAVE cascading for 32-bit+ bus expansion.

It integrates full hardware semaphore support (8 flags addressed by A0–A2), separate upper/lower byte enables (UB/LB), and interrupt flag generation (INTL/INTR). The device operates in three power states: active (750 mW typ.), standby (5 mW typ. for S version), and data retention (2V, ≤4 mA).

Key Specifications

Pinout & Package

7024S35J is packaged in an 84-pin Plastic Leaded Chip Carrier (PLCC), body size ≈ 1.15 in × 1.15 in × 0.17 in. All VCC pins require connection to 5V supply; all GND pins must be tied to system ground.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1370D-35AC and AS7C34096A-35JCIN, the 7024S35J uniquely provides integrated BUSY-based hardware arbitration and full semaphore support in a 5V PLCC-84 package - making it irreplaceable in legacy industrial designs requiring deterministic contention resolution without FPGA logic overhead.

Availability

7024S35J is available at Aetrix Electronics and suitable for industrial PLC controllers, avionics data concentrators, and medical imaging subsystems requiring stable component supply across extended product lifecycles.

Supply support for 7024S35J 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.

The 7024S35J belongs to IDT's legacy high-speed dual-port SRAM family, designed specifically for deterministic inter-processor communication in real-time embedded systems where hardware arbitration and battery-backed retention are mandatory.

FAQ

What is the maximum operating speed of the 7024S35J?

The 7024S35J has a maximum read cycle time (tRC) of 35 ns, supporting sustained operation up to 28.6 MHz per port. This speed is guaranteed across the full industrial temperature range (–40°C to +85°C) with 5.0 V ±10% supply. The 35 ns rating applies to both read and write cycles under specified AC test conditions including GND-to-3V input transitions and defined load capacitance.

Does the 7024S35J support battery backup operation?

Yes, the 7024S35J supports battery backup data retention at VCC = 2.0 V minimum, preserving stored data during main power loss. This capability is inherent to the "L" variant designation in the family, and the 7024S35J - though labeled "S" - retains the 2V retention spec per IDT documentation. Typical data retention current is ≤4 mA at 2V, enabling long-term hold using small coin-cell batteries.

How does the BUSY arbitration mechanism work on the 7024S35J?

The 7024S35J uses the M/S pin to configure BUSY as either output (M/S = H, Master) or input (M/S = L, Slave). When two devices cascade, the Master asserts BUSY to block Slave writes during contention. The BUSY timing parameters (e.g., tBAA ≤35 ns) ensure rapid detection of address matches, and tBDD guarantees valid data appears within 35 ns after BUSY deassertion - enabling lock-free, hardware-resolved access conflicts.

What package type is used for the 7024S35J?

The 7024S35J is supplied in an 84-pin Plastic Leaded Chip Carrier (PLCC) package, with dimensions approximately 1.15 in × 1.15 in × 0.17 in. This package is RoHS-compliant, surface-mount compatible, and features internal lead-frame construction suitable for reflow soldering. Pin assignments match the standard IDT PLCC-84 footprint documented in datasheet drawing 2740 drw 02F.

Can the 7024S35J be used in MASTER/SLAVE configurations?

Yes, the 7024S35J explicitly supports MASTER/SLAVE cascading via the M/S pin and BUSY signaling. When configured as Master (M/S = H), BUSY is driven to indicate contention; as Slave (M/S = L), BUSY is sampled to inhibit writes. This allows seamless expansion to 32-bit or wider data buses without external logic - a key feature confirmed in IDT's functional description and pin configuration diagrams.