Renesas 70V05S25J8

Overview

70V05S25J8 from IDT is a high-speed 3.3V 8K × 8 dual-port static RAM with true independent left/right ports, 25 ns maximum access time (commercial grade), TTL-compatible I/O, and on-chip semaphore and interrupt logic - used in real-time interprocessor communication, video frame buffers, and network packet buffering.

For engineers reviewing the 70V05S25J8 datasheet, 70V05S25J8 pinout, 70V05S25J8 application, or 70V05S25J8 equivalent, this page delivers verified timing specs, master/slave BUSY arbitration behavior, semiconductor-grade DC/AC electrical characteristics, and industrial-temperature-compatible package mapping for immediate design integration.

Technical Context

The 70V05S25J8 implements fully asynchronous dual-port operation with separate address, control, and data buses per port, enabling simultaneous read/write to the same memory location only when BUSY arbitration resolves contention. Its on-chip hardware semaphore logic supports eight flag registers addressed via A0–A2, with dedicated SEM pins and push-pull INT/BUSY outputs.

It uses CMOS high-performance fabrication for low-power operation (typ. 380 mW active, 660 µW standby) and supports MASTER/SLAVE cascading via M/S pin to expand data width beyond 8 bits without external logic. Power-down is controlled per-port by CE, and all I/Os are 3.3 V ±0.3 V tolerant.

Key Specifications

Pinout & Package

70V05S25J8 is packaged in a 68-pin Plastic Leaded Chip Carrier (PLCC), J8 suffix, with 0.95″ × 0.95″ body size and 0.17″ height. All VDD pins require local decoupling; all GND pins must be connected to system ground.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C024AV-25AXC and IDT70V25S25PF8, the 70V05S25J8 provides unique PLCC-based field-serviceability and native Master/Slave expansion - making it optimal for legacy industrial controllers and repairable systems where socketed components and modular memory upgrades are prioritized.

Availability

70V05S25J8 is available at Aetrix Electronics and suitable for real-time interprocessor communication, video frame buffering, and network packet buffering requiring stable component supply across extended production lifecycles.

Supply support for 70V05S25J8 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 timing, memory interface, and RF solutions before its acquisition by Renesas in 2019.

The 70V05S25J8 belongs to IDT's high-speed dual-port SRAM product line, designed specifically for deterministic, low-latency shared-memory applications in telecommunications infrastructure, industrial automation, and digital video systems.

FAQ

What is the maximum operating frequency supported by the 70V05S25J8?

The 70V05S25J8 does not specify a clock frequency because it is an asynchronous SRAM. Its performance is defined by access time: 25 ns maximum (tAA) under commercial conditions (3.3 V, 0°C to +70°C). This corresponds to a theoretical maximum read cycle rate of ~40 MHz, but actual throughput depends on system-level timing margins and bus protocol overhead. The 70V05S25J8 requires no external clock signal.

Does the 70V05S25J8 support true simultaneous read operations from both ports to the same address?

Yes, the 70V05S25J8 supports true simultaneous reads from both ports to the same memory location without contention or arbitration delay. This is enabled by its true dual-port cell architecture. However, simultaneous write-to-same-address is prohibited and triggers BUSY arbitration - the 70V05S25J8 will block one port until the other completes the write.

How is the M/S pin used to configure master/slave operation in the 70V05S25J8?

In the 70V05S25J8, the M/S pin sets arbitration role: VIH configures the device as MASTER (BUSYL/BUSYR are outputs), while VIL configures it as SLAVE (BUSYL/BUSYR become inputs). When cascading multiple 70V05S25J8 devices for wider data paths, one is designated MASTER and others SLAVE; the MASTER's BUSY outputs feed SLAVE BUSY inputs to coordinate access across the group.

What is the function of the SEM pins on the 70V05S25J8, and how are semaphores accessed?

The SEML and SEMR pins on the 70V05S25J8 enable hardware semaphore register access. To read/write a semaphore flag, set CE = VIH and SEM = VIL (active-low logic), then use A0–A2 to select one of eight flags; I/O0–I/O7 carry the 8-bit semaphore value. This provides atomic, lock-free synchronization between ports without CPU intervention - a core capability of the 70V05S25J8.

Can the 70V05S25J8 operate reliably at 3.0 V supply voltage?

Yes, the 70V05S25J8 is specified for VDD = 3.3 V ±0.3 V, meaning it operates reliably from 3.0 V to 3.6 V. At 3.0 V, AC timing parameters (e.g., tAA) may degrade slightly versus nominal 3.3 V conditions, but all DC and AC specifications remain guaranteed across the full voltage range per the datasheet. No derating is required for 3.0 V operation in commercial temperature range.