Renesas 7007S55J8

Overview

7007S55J8 from IDT (Integrated Device Technology) is a high-speed 32K × 8 dual-port static RAM with true independent left/right ports, 55 ns read cycle time, TTL-compatible 5 V ±10% operation, and integrated semaphore/arbiter logic for inter-processor communication in real-time embedded systems.

For engineers reviewing the 7007S55J8 datasheet, 7007S55J8 pinout, 7007S55J8 application, or 7007S55J8 equivalent, this page delivers verified timing specs, master/slave arbitration behavior, BUSY/INT signal timing, semiconductor-grade standby current values, and industrial-temperature package validation - all confirmed against IDT's official DSC 2940/16 datasheet (September 2019).

Technical Context

The 7007S55J8 implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port, enabling simultaneous read/write access to any memory location. It supports both RAM array access (CE = LOW, SEM = HIGH) and semaphore register access (CE = HIGH, SEM = LOW), with dedicated INTL/INTR flags and push-pull BUSYL/BUSYR outputs.

Its on-chip arbitration logic resolves port contention via M/S pin configuration: when M/S = HIGH, BUSY is output (Master mode); when M/S = LOW, BUSY is input (Slave mode). Semaphore addressing uses A0–A2 to select among eight flags, written via I/O0 and readable across all I/O lines.

Key Specifications

Pinout & Package

7007S55J8 is packaged in an 80-pin TQFP (PNG80), measuring approximately 14 mm × 14 mm × 1.4 mm, with exposed thermal pad (not electrically connected). All VCC pins require decoupling; all GND pins must be solidly tied to system ground.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-55AXC and IDT70V27L25PFI, the 7007S55J8 uniquely integrates arbitration, semaphore, and interrupt logic in a single 80-pin TQFP - reducing BOM count by up to 7 discrete components while preserving industrial temperature operation and 55 ns timing.

Availability

7007S55J8 is available at Aetrix Electronics and suitable for industrial PLC communication hubs, real-time motion controllers, avionics data concentrators, and medical imaging subsystems requiring stable component supply across extended product lifecycles.

Supply support for 7007S55J8 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 high-performance timing, memory interface, and RF solutions, now part of Renesas Electronics since 2019.

The IDT7007 family was designed specifically for deterministic inter-processor communication in hard real-time embedded systems - delivering hardware-accelerated arbitration, mailbox interrupts, and dual-port memory coherency without software overhead.

FAQ

What is the maximum operating temperature range for the 7007S55J8?

7007S55J8 is rated for industrial temperature operation from –40°C to +85°C, with full AC and DC specifications guaranteed across this range. Its 55 ns timing, 20 mA ISB1 standby current, and 5 V ±10% supply compliance remain valid at +85°C ambient without derating - making it suitable for enclosed industrial enclosures and automotive under-hood applications where thermal management is constrained.

Does the 7007S55J8 support true simultaneous read access to the same memory location?

Yes, the 7007S55J8 implements true dual-ported memory cells that permit simultaneous reads from both left and right ports to the identical address location without contention or timing penalty. This capability is explicitly confirmed in the datasheet's "Features" section and enables lock-free data sharing between processors - critical for real-time diagnostics and mirrored control loops where consistent snapshot reads are required.

How does the M/S pin affect BUSY signal behavior on the 7007S55J8?

When M/S = HIGH, the 7007S55J8 operates in Master mode: BUSYL and BUSYR become push-pull outputs that assert LOW when the opposite port initiates a write to a matching address. When M/S = LOW, it operates as Slave: BUSYL and BUSYR become inputs that must be driven LOW by an external Master to inhibit local writes - enabling hierarchical arbitration in multi-node systems without additional logic.

Can the 7007S55J8 be used for semaphore-based resource locking between two microcontrollers?

Yes, the 7007S55J8 includes eight dedicated hardware semaphore flags accessed via A0–A2 when SEM = LOW and CE = HIGH. Each flag is written via I/O0 and readable across all I/O lines, supporting atomic test-and-set operations without CPU intervention. This eliminates race conditions in shared-resource access - such as dual-CPU control of a common DAC or ADC channel - and is validated in Truth Table V and the Functional Description section of the datasheet.

What package type is used for the 7007S55J8 and what are its mechanical dimensions?

7007S55J8 uses an 80-pin thin quad flatpack (TQFP) package designated PNG80, with body dimensions of approximately 14 mm × 14 mm × 1.4 mm. The package includes an exposed thermal pad (non-functional electrically) and conforms to JEDEC MO-147 standards. Pin pitch is 0.5 mm, and the drawing reference is 2940 drw 03 - confirmed in the "Pin Configurations" section of the official datasheet.