Renesas 7005S35J

Overview

7005S35J from IDT (Integrated Device Technology) is a high-speed 8K × 8 dual-port static RAM with true independent left/right port access, 35 ns maximum read cycle time, TTL-compatible 5V ±10% operation, and integrated hardware semaphore and interrupt logic - used in real-time inter-processor communication systems requiring simultaneous memory access without arbitration overhead.

For engineers reviewing the 7005S35J datasheet, 7005S35J pinout, 7005S35J application, or 7005S35J equivalent, this page delivers verified timing specs, master/slave BUSY arbitration behavior, semiconductor-grade DC/AC electrical characteristics, and exact package mapping for the 64-pin TQFP variant.

Technical Context

The 7005S35J implements fully asynchronous dual-port architecture with separate address, data, and control buses per port (A0L–A12L/I/O0L–I/O7L/R/WL/CEL/OEL on left; A0R–A12R/I/O0R–I/O7R/R/WR/CER/OER on right), enabling concurrent reads/writes to any memory location. It supports both RAM mode (CE = VIL, SEM = VIH) and semaphore mode (CE = VIH, SEM = VIL).

Hardware arbitration uses push-pull BUSY outputs (BUSYL/BUSYR) when M/S = H (master), or BUSY inputs when M/S = L (slave); semaphore flags are eight 1-bit registers addressed by A0–A2 and accessed via I/O0–I/O7. Interrupts are edge-triggered and cleared by writing to dedicated addresses (1FFE_H for INTL, 1FFF_H for INTR).

Key Specifications

Pinout & Package

7005S35J is packaged in a 64-pin thin quad flatpack (TQFP), body size 14 mm × 14 mm × 1.4 mm, lead pitch 0.5 mm, RoHS-compliant and green-part qualified.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-35JC and R1EX24064ASAS0I#U0, the 7005S35J uniquely integrates full hardware arbitration, semaphore registers, and true dual-port timing in a single 64-pin TQFP - reducing system latency, PCB area, and firmware development effort for deterministic inter-processor communication.

Availability

7005S35J is available at Aetrix Electronics and suitable for real-time inter-processor communication, digital signal processing buffering, and industrial PLC I/O mapping requiring stable component supply across commercial temperature grades.

Supply support for 7005S35J 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) was a fabless semiconductor company specializing in high-performance memory, timing, and interface solutions before its acquisition by Renesas Electronics in 2019.

The IDT7005 family was designed for deterministic, low-latency shared-memory architectures in aerospace, defense, and industrial automation - emphasizing hardware-enforced coherency over software-managed synchronization.

FAQ

What is the maximum operating frequency supported by the 7005S35J?

The 7005S35J does not operate at a fixed clock frequency; it is an asynchronous SRAM. Its performance is defined by timing parameters - specifically, the maximum read cycle time (tRC) is 35 ns, which corresponds to a theoretical maximum sustained access rate of approximately 28.6 million operations per second per port. This value is guaranteed across the commercial temperature range (0°C to +70°C) with VCC = 5.0 V ±10%.

Does the 7005S35J support battery backup operation?

Yes, the 7005S35J supports battery backup operation with data retention down to VCC = 2.0 V. In data retention mode, the device maintains stored memory contents while drawing ≤4000 µA (typical 100 µA) from the backup source. This capability is inherent to the "S" version (7005S35J) and does not require external circuitry beyond a 2V backup supply connected to VCC.

How does the BUSY arbitration mechanism work on the 7005S35J?

The 7005S35J uses push-pull BUSY signals (BUSYL/BUSYR) that are outputs when M/S = H (master) and inputs when M/S = L (slave). During simultaneous write attempts to the same address, the port asserting its address and enables first wins arbitration; the losing port's BUSY line goes active (low for master, or drives slave's BUSY input), inhibiting its write. The tAPS (arbitration priority setup) parameter ensures deterministic resolution within 5 ns.

Can the 7005S35J be used in a 16-bit data bus configuration?

Yes, the 7005S35J supports 16-bit expansion via Master/Slave cascading. Two devices are connected with M/S = H on the master (BUSY outputs) and M/S = L on the slave (BUSY inputs). The master's BUSYL/BUSYR drive the slave's BUSYL/BUSYR inputs, enabling coordinated access across both 8-bit ports to form a unified 16-bit data path - no external glue logic is required.

What are the valid interrupt address locations for the 7005S35J?

The 7005S35J uses dedicated memory-mapped addresses to control interrupts: writing any value to address 1FFE_H sets the left-port interrupt flag (INTL), and writing to 1FFF_H sets the right-port flag (INTR). Reading from those addresses has no effect. To clear an interrupt, write to the same address again - the flag resets on the rising edge of the write pulse, as confirmed in Truth Table III of the official datasheet.