Renesas 7007S35J8

Overview

7007S35J8 from IDT (Integrated Device Technology) is a high-speed 32K × 8 dual-port static RAM with true independent left/right ports, 35 ns read cycle time (tRC), TTL-compatible 5 V ±10% supply, and integrated hardware semaphore/arbiter logic for inter-processor communication in real-time embedded systems.

For engineers reviewing the 7007S35J8 datasheet, 7007S35J8 pinout, 7007S35J8 application, or 7007S35J8 equivalent, this page delivers verified timing specs, master/slave arbitration behavior, BUSY/INT signal timing, semiconductor-grade standby current (ISB1 = 20 mA), and industrial temperature support (–40°C to +85°C).

Technical Context

The 7007S35J8 implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port-enabling simultaneous read/write access to the same memory location without contention when BUSY arbitration is disabled. Its on-chip semaphore logic uses A0–A2 addressing to manage eight shared flags via dedicated SEM pins.

Port arbitration operates in two modes: M/S = H configures the device as Master with BUSY outputs asserting during address/contention conflict; M/S = L configures it as Slave with BUSY inputs inhibiting writes. Interrupt flags (INTL/INTR) are triggered by writes to fixed mailbox addresses (7FFE_H/7FFF_H) and cleared by reads to those same locations.

Key Specifications

Pinout & Package

7007S35J8 is packaged in an 80-pin TQFP (PNG80), measuring approximately 14 mm × 14 mm × 1.4 mm, with 4×20 pin grid, exposed thermal pad, and standard 0.5 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-35AC and R1EX24032AS0C-35, the 7007S35J8 uniquely integrates master/slave arbitration, push-pull BUSY signaling, and hardware semaphores - reducing BOM count by up to 3 discrete ICs and guaranteeing sub-35 ns inter-processor coordination.

Availability

7007S35J8 is available at Aetrix Electronics and suitable for industrial PLC communication hubs, avionics dual-core data exchange, and medical imaging frame buffers requiring stable component supply across extended product lifecycles.

Supply support for 7007S35J8 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 high-performance computing solutions, acquired by Renesas in 2019.

The IDT7007 family was designed specifically for real-time inter-processor communication in deterministic embedded systems - emphasizing hardware-accelerated arbitration, low-latency mailbox interrupts, and industrial-grade reliability.

FAQ

What is the maximum operating temperature range supported by the 7007S35J8?

The 7007S35J8 is rated for industrial temperature operation from –40°C to +85°C. This specification is confirmed in the Absolute Maximum Ratings table and DC Operating Conditions section of the official IDT datasheet (DSC 2940/16, September 2019). No derating is required within this range, and all AC timing parameters-including 35 ns tRC-are guaranteed across the full span.

Does the 7007S35J8 support true simultaneous read operations from both ports to the same memory address?

Yes, the 7007S35J8 features true dual-ported memory cells that allow concurrent reads from both left and right ports to the identical address location without contention or timing penalty. This capability is explicitly stated in the Features section and validated by the Functional Block Diagram showing independent I/O and control paths. The 35 ns tRC applies independently per port.

How does the M/S pin affect BUSY signal behavior in the 7007S35J8?

When M/S = H, the 7007S35J8 operates as Master: BUSYL and BUSYR become push-pull outputs that assert LOW during port contention to block writes. When M/S = L, it operates as Slave: BUSYL and BUSYR become inputs that must be driven LOW by an external Master to inhibit writes. This behavior is defined in Note 1 of the Pin Names table and Truth Table IV.

What are the exact mailbox addresses used for interrupt generation in the 7007S35J8?

The 7007S35J8 uses fixed hexadecimal addresses for interrupt mailbox functionality: writing to address 7FFE_H asserts the left-port INTL flag, and writing to 7FFF_H asserts the right-port INTR flag. Clearing is performed by reading those same addresses. This is documented in Truth Table III and the Functional Description section of the datasheet.

Is the 7007S35J8 pin-compatible with other members of the IDT7007 family such as the 7007S25J8?

Yes, the 7007S35J8 shares identical pinout, package (80-pin TQFP), and signal mapping with all speed grades in the IDT7007S series-including 7007S25J8 and 7007S55J8. Differences are limited to AC timing parameters (e.g., tRC = 25 ns vs. 35 ns vs. 55 ns) and corresponding current consumption; no PCB layout change is required when upgrading or downgrading speed grade.