Renesas 7005S35J8/2594

Overview

7005S35J8/2594 from IDT is a high-speed 8K × 8 dual-port static RAM with true independent left/right ports, 35 ns max read cycle time (tRC), TTL-compatible 5V ±10% operation, and integrated hardware semaphore/arbitration logic. It enables simultaneous asynchronous access to the same memory location and supports master/slave cascading for 16-bit+ bus expansion in real-time inter-processor communication systems.

For engineers reviewing the 7005S35J8/2594 datasheet, 7005S35J8/2594 pinout, 7005S35J8/2594 application, or 7005S35J8/2594 equivalent, key selection considerations include its 35 ns commercial-grade timing, 64-pin TQFP package, BUSY/INT semaphore signaling, dual-port arbitration behavior, and battery-backed data retention capability at 2V.

Technical Context

The 7005S35J8/2594 implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port (A0L–A12L/I/O0L–I/O7L and A0R–A12R/I/O0R–I/O7R), enabling concurrent reads/writes without external logic. Its on-chip arbitration uses BUSY flag assertion (push-pull, not open-drain) triggered by address match or CE timing, with priority set-up time tAPS = 5 ns.

It supports two distinct operational modes: RAM access (CE = VIL, SEM = VIH) and semaphore register access (CE = VIH, SEM = VIL), where eight semaphore flags are addressed via A0–A2 and read/written through I/O0–I/O7. The M/S pin configures BUSY as output (master) or input (slave), enabling daisy-chained multi-device systems.

Key Specifications

Pinout & Package

7005S35J8/2594 is housed in a 64-pin TQFP (PNG64) package with 0.5 mm pitch, requiring standard reflow profiles. All VCC pins must be decoupled locally; 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-35AXC and AS7C38097A-35JCIN, the 7005S35J8/2594 delivers unique value through integrated semaphore registers, deterministic BUSY arbitration, and master/slave cascading-reducing BOM count and firmware complexity in tightly coupled multi-CPU systems.

Availability

7005S35J8/2594 is available at Aetrix Electronics and suitable for real-time inter-processor communication, digital signal processing buffering, and industrial PLC memory expansion requiring stable component supply across commercial temperature range and long-term production cycles.

Supply support for 7005S35J8/2594 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 sensor solutions, now part of Renesas Electronics since 2019.

The IDT7005 product line was designed for high-reliability dual-port memory applications in aerospace, defense, and industrial control systems requiring deterministic arbitration, low-latency access, and robust data coherency across independent processors.

FAQ

What is the maximum operating frequency supported by the 7005S35J8/2594?

The 7005S35J8/2594 does not operate at a fixed clock frequency but supports asynchronous operation with a maximum read cycle time (tRC) of 35 ns. This corresponds to an effective throughput of up to ~28.6 MHz for consecutive read operations. Write cycle time (tWC) is also 35 ns, ensuring balanced performance for mixed read/write workloads in real-time systems.

Does the 7005S35J8/2594 support battery backup operation, and what voltage is required?

Yes, the 7005S35J8/2594 supports battery backup data retention at VCC = 2.0 V minimum, with ICCDR ≤ 4000 µA across military and industrial temperature ranges. This feature is inherent to the "L" variant design lineage and applies to the 7005S35J8/2594, enabling nonvolatile storage during main power failure without external circuitry.

How does the BUSY arbitration mechanism work on the 7005S35J8/2594?

The 7005S35J8/2594 uses hardware-based BUSY arbitration triggered either by address match (tBAA ≤ 20 ns) or chip enable timing (tBAC ≤ 20 ns). When M/S = H (master), BUSYL/BUSYR are push-pull outputs asserting low to block conflicting writes. Priority is resolved via tAPS = 5 ns setup time - the port meeting timing first wins, ensuring deterministic behavior without software intervention.

Can the 7005S35J8/2594 be used in master/slave configurations, and how is it configured?

Yes, the 7005S35J8/2594 supports master/slave cascading via the M/S pin: logic high configures BUSYL/BUSYR as outputs (master), while logic low configures them as inputs (slave). In slave mode, BUSY input inhibits local writes during contention, enabling synchronized multi-device memory expansion - critical for building 16-bit or wider data paths without external address decoding.

What are the key differences between the 7005S35J8/2594 and the IDT7005L variant?

The 7005S35J8/2594 belongs to the "S" (standard power) family, with typical active current ICC = 150 mA and standby ISB1 = 13 mA. In contrast, the "L" (low-power) variant offers lower standby consumption (ISB1 = 1 mA typ.) and enhanced battery retention (ICCDR ≤ 5 µA at 2V), but shares identical 35 ns timing, pinout, and functional architecture - making them drop-in replacements where power envelope permits.