Renesas 70V26S35J8

Overview

70V26S35J8 from Integrated Device Technology is a high-speed 3.3V 16K × 16 true dual-port static RAM with independent left/right ports, 35 ns maximum access time, 300 mW typical active power, and on-chip semaphore logic for inter-processor resource arbitration in real-time embedded systems.

For engineers reviewing the 70V26S35J8 datasheet, 70V26S35J8 pinout, 70V26S35J8 application, or 70V26S35J8 equivalent, this device supports simultaneous asynchronous reads/writes to shared memory locations, hardware BUSY arbitration, byte-selectable I/O control, and master/slave cascading for 32-bit+ bus expansion - critical for multi-CPU industrial controllers and telecom packet buffers.

Technical Context

The 70V26S35J8 implements fully asynchronous dual-port operation with separate address, control, and bidirectional data buses per port. Its on-chip arbitration logic resolves contention via push-pull BUSY outputs (BUSYL/BUSYR) when both ports access identical addresses, enabling deterministic write-inhibit behavior without external logic.

It integrates eight independent semaphore latches accessible via dedicated SEM pin activation (CE = VIH, SEM = VIL), with A0–A2 addressing and I/O0 as write input - supporting token-passing protocols between processors without software overhead or wait states.

Key Specifications

Pinout & Package

70V26S35J8 is housed in an 84-pin Plastic Leaded Chip Carrier (PLCC) package with 0.050″ lead pitch and 1.15″ × 1.15″ body size. All VDD pins require connection to 3.3 V supply; all VSS pins must be grounded.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-35AXI, the 70V26S35J8 delivers integrated arbitration and token-passing capability in the same speed grade, reducing BOM count and firmware complexity. Against IDT70V36S35PF8, it offers identical timing and feature set at lower density and smaller 84-pin PLCC footprint - ideal for cost- and space-sensitive commercial designs.

Availability

70V26S35J8 is available at Aetrix Electronics and suitable for industrial PLC controllers, telecom packet buffers, medical imaging subsystems, and avionics data recorders requiring stable component supply and long-term production continuity.

Supply support for 70V26S35J8 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

Integrated Device Technology (IDT), now part of Renesas Electronics, is a fabless semiconductor company specializing in timing, memory interface, RF, and high-performance interconnect solutions.

The 70V26S35J8 belongs to IDT's high-speed dual-port SRAM product line, engineered for deterministic, low-latency memory sharing between heterogeneous processors in real-time embedded systems.

FAQ

What is the operating temperature range for the 70V26S35J8?

The 70V26S35J8 is rated for commercial temperature operation from 0°C to +70°C. This specification is confirmed in the Absolute Maximum Ratings and Recommended DC Operating Conditions tables of the official IDT datasheet DSC-2945/19. It does not support industrial (-40°C to +85°C) or extended ranges - use the 70V26L variant for wider thermal tolerance.

Does the 70V26S35J8 support true simultaneous read operations on both ports?

Yes, the 70V26S35J8 supports true simultaneous reads from both ports to the same or different memory locations. Its true dual-port SRAM cell architecture enables independent, asynchronous access with no internal contention - verified in the Functional Block Diagram and Truth Table I of the datasheet. BUSY arbitration only activates during simultaneous read/write or write/write conflicts.

How is semaphore functionality accessed on the 70V26S35J8?

Semaphore registers are accessed by asserting SEM = VIL and CE = VIH (opposite of normal RAM access), then using A0–A2 to select one of eight flags and I/O0 to write (0 = acquire, 1 = release). All 16 I/O pins reflect the flag value on read. This mode is explicitly defined in Truth Table II and the Functional Description section of the 70V26S35J8 datasheet.

What package type is used for the 70V26S35J8?

The 70V26S35J8 uses an 84-pin Plastic Leaded Chip Carrier (PLCC) package, as confirmed by the Pin Configurations diagram (DSC-2945/19, page 2) and ordering information. The "J8" suffix in the part number denotes this PLCC variant; the PGA version uses "G" suffix (e.g., 70V26S35G).

Can the 70V26S35J8 be used in a master/slave configuration for 32-bit data bus expansion?

Yes, the 70V26S35J8 supports master/slave cascading via the M/S pin: tied HIGH for MASTER (BUSY outputs drive external slave BUSY inputs), LOW for SLAVE (BUSY pins become write-inhibit inputs). This is documented in the Features list, Functional Description, and Figure 3 of the datasheet - enabling seamless 32-bit word expansion without additional glue logic.