Renesas 7007S35J

Overview

7007S35J from IDT (Integrated Device Technology) is a high-speed 32K × 8 dual-port static RAM with true independent left/right ports, 35 ns maximum read cycle time, TTL-compatible 5 V ±10% operation, and integrated BUSY/INT/SEM arbitration logic - used in real-time inter-processor communication systems requiring simultaneous access to shared memory without external logic.

For engineers reviewing the 7007S35J datasheet, 7007S35J pinout, 7007S35J application, or 7007S35J equivalent, key selection criteria include guaranteed 35 ns access across industrial temperature range (–40°C to +85°C), master/slave cascading support for 16-bit+ bus expansion, on-chip semaphore and interrupt flag handling, and PLCC-68 packaging with push-pull BUSY/INT outputs.

Technical Context

The 7007S35J implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port - enabling concurrent read/write operations to the same memory location. Its on-chip arbitration logic resolves contention via BUSY flag assertion (M/S = H for master output, M/S = L for slave input) and supports both CE-controlled and address-match–triggered arbitration modes.

It integrates dedicated semaphore registers (8 flags, addressed by A0–A2) accessible when SEM = VIL and CE = VIH, and interrupt flags (INTL/INTR) tied to fixed addresses 7FFE_H (left port set) and 7FFF_H (right port set), with automatic reset on read/write of those locations.

Key Specifications

Pinout & Package

68-pin PLCC package with 0.05-inch lead pitch; body size ≈ 24.1 mm × 24.1 mm × 4.3 mm; requires all V_CC and GND pins to be connected per datasheet Note 1–2.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-35AXC and IDT70V27L25PF, the 7007S35J uniquely delivers 5 V TTL compatibility, integrated M/S-configurable arbitration, and PLCC-68 packaging - making it optimal for retrofitting legacy industrial controllers without redesigning power or footprint.

Availability

7007S35J is available at Aetrix Electronics and suitable for industrial motion control, avionics data concentrators, and medical imaging subsystems requiring stable component supply with long-term obsolescence planning.

Supply support for 7007S35J 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; known for high-reliability industrial and aerospace memory products.

The IDT7007 family was designed specifically for deterministic inter-processor communication in real-time embedded systems - emphasizing hardware arbitration, low-latency access, and robust 5 V operation across extended temperature ranges.

FAQ

What is the maximum operating temperature range certified for the 7007S35J?

The 7007S35J is rated for industrial temperature operation from –40°C to +85°C, as confirmed in the Absolute Maximum Ratings and Recommended DC Operating Conditions tables of the official IDT datasheet DSC2940/16. This range is validated across all AC and DC specifications including tAA = 35 ns max and ISB1 ≤ 20 mA.

Does the 7007S35J support true simultaneous read operations from both ports to the same memory address?

Yes, the 7007S35J implements true dual-ported memory cells that allow simultaneous reads of the same memory location without conflict or performance penalty - a core feature explicitly stated in the "Features" section of the datasheet and enabled by independent left/right address and I/O paths.

How is semaphore functionality implemented in the 7007S35J, and what address range does it use?

The 7007S35J implements eight hardware semaphore flags accessed via A0–A2 address lines when SEM = VIL and CE = VIH - as defined in Truth Table II and Functional Description. These flags reside in a dedicated register bank separate from main memory and support atomic read/write for resource locking.

Can the 7007S35J be used in a master/slave configuration to expand data bus width beyond 8 bits?

Yes, the 7007S35J supports cascading via the M/S pin to build 16-bit-or-wider memory systems: one device configured as master (M/S = H) provides BUSY output, while slaves (M/S = L) accept BUSY input - enabling full-speed error-free operation without external arbitration logic, as described in the device description and features list.

What package type is used for the 7007S35J, and are there alternate package options for this speed grade?

The 7007S35J is packaged in a 68-pin Plastic Leaded Chip Carrier (PLCC), as confirmed by Pin Configuration diagrams and ordering information in the datasheet. While the IDT7007 family also offers 80-pin TQFP variants, the 35 ns speed grade (7007X35) is documented exclusively in PLCC-68 for this part number.