Renesas 7026S35J8

Overview

IDT7026S35J8 from Integrated Device Technology (IDT) is a high-speed 16K × 16 true dual-port static RAM with independent left/right ports, 35 ns maximum access time, TTL-compatible 5V ±10% operation, and on-chip semaphore arbitration logic - used in real-time interprocessor communication systems requiring concurrent read/write access to shared memory.

For engineers reviewing the IDT7026S35J8 datasheet, IDT7026S35J8 pinout, IDT7026S35J8 application, or IDT7026S35J8 equivalent, key selection criteria include simultaneous port access capability, BUSY flag arbitration timing (tBAA ≤ 20 ns), master/slave cascading support via M/S pin, and industrial temperature range (-40°C to +85°C) compliance.

Technical Context

The IDT7026S35J8 implements fully asynchronous dual-port architecture with separate address, control, and I/O buses for left and right ports - enabling independent read/write operations to any memory location without external synchronization. It integrates hardware semaphore logic (8 flags, addressed by A0–A2) and automatic power-down per port via CE-driven standby mode.

Its arbitration mechanism uses either chip-enable (CE) or address-match detection to assert BUSY outputs (push-pull, non-tri-stated) when contention occurs; M/S pin configures BUSYL/BUSYR as outputs (master) or inputs (slave), enabling scalable multi-device memory expansion with deterministic priority resolution.

Key Specifications

Pinout & Package

84-pin PLCC package (body size ≈ 1.15 in × 1.15 in × 0.17 in); all VCC pins require connection to 5V supply, all GND pins to ground. Pin 1 index corner marked; orientation per top-view diagram in datasheet DSC 2939/17.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT7026S35J8, CY7C1362BV33 offers lower voltage operation but requires system-level voltage translation, while R1EX24064ASAS provides extended temperature capability in identical functionality at higher cost and different mechanical form factor.

Availability

IDT7026S35J8 is available at Aetrix Electronics and suitable for real-time interprocessor communication, digital signal processing buffering, and redundant control system memory requiring stable component supply across industrial temperature environments.

Supply support for IDT7026S35J8 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) was a fabless semiconductor company specializing in timing, memory interface, RF, and sensor solutions before its acquisition by Renesas Electronics in 2019.

IDT7026S35J8 belongs to the IDT7026 family of high-speed dual-port SRAMs designed specifically for deterministic, low-latency interprocessor communication in industrial and telecom infrastructure equipment.

FAQ

What is the maximum operating temperature range for the IDT7026S35J8?

IDT7026S35J8 is rated for industrial temperature operation from -40°C to +85°C, verified per datasheet DSC 2939/17 Section 3. This range supports deployment in factory automation controllers, motor drives, and outdoor telecom equipment without derating.

Does the IDT7026S35J8 support true simultaneous access to the same memory location?

Yes, IDT7026S35J8 implements true dual-port SRAM cells that allow concurrent read/write operations to identical addresses. When contention occurs, on-chip BUSY logic asserts BUSYL or BUSYR to stall the later access - ensuring data coherency without external arbitration circuitry.

How does the M/S pin affect BUSY pin behavior on the IDT7026S35J8?

When M/S = HIGH, IDT7026S35J8 operates as a master: BUSYL and BUSYR are push-pull outputs indicating port contention. When M/S = LOW, it operates as a slave: BUSYL and BUSYR become inputs that internally inhibit writes - enabling hierarchical master/slave memory arrays.

What is the function of the semaphore logic in the IDT7026S35J8?

IDT7026S35J8 includes eight hardware semaphore flags accessible via I/O0 (write) and all I/O lines (read), addressed by A0–A2. These flags enable atomic resource locking between processors - for example, coordinating access to shared peripherals or critical code sections without software overhead.

Is the IDT7026S35J8 pin-compatible with faster or slower speed grades in the same family?

Yes, IDT7026S35J8 shares identical 84-pin PLCC pinout and electrical interface with other IDT7026 variants (e.g., IDT7026S25J8, IDT7026S20J8). Speed grade differences affect only AC timing parameters - allowing drop-in replacement where system timing margins permit.