Renesas 7007S15J8

Overview

7007S15J8 from IDT is a high-speed 32K × 8 dual-port static RAM with true independent left/right ports, 15 ns maximum access time (commercial grade), 5 V ±10% single-supply operation, and on-chip semaphore/interrupt arbitration logic. It enables simultaneous asynchronous read/write access to the same memory location in real-time inter-processor communication systems.

For engineers reviewing the 7007S15J8 datasheet, 7007S15J8 pinout, 7007S15J8 application, or 7007S15J8 equivalent, this device supports master/slave cascading for 16-bit+ data buses, provides push-pull BUSY/INT flags, and delivers full hardware semaphore signaling without external logic - critical for deterministic multi-CPU shared-memory designs.

Technical Context

The 7007S15J8 implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port. Its on-chip arbitration logic resolves contention via BUSY flag assertion (M/S = H) or BUSY input synchronization (M/S = L), and supports both CE-controlled and R/W-controlled write cycles.

It integrates eight dedicated semaphore registers addressed by A0–A2, accessed only when SEM = VIL and CE = VIH, with tSOP = 10 ns minimum pulse width. Interrupt flags (INTL/INTR) are set/cleared by writes to fixed addresses 7FFE_H (left) and 7FFF_H (right), enabling mailbox-style CPU coordination.

Key Specifications

Pinout & Package

68-pin Plastic Leaded Chip Carrier (PLCC), body size ≈ 0.95 in × 0.95 in × 0.17 in. All V_CC and GND pins must be connected per datasheet note.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C024AV-15AXC and IDT70V25L15PF, the 7007S15J8 uniquely delivers integrated master/slave cascading and 5 V TTL compatibility in a compact 68-pin PLCC - reducing BOM count and PCB area in legacy industrial control upgrades.

Availability

7007S15J8 is available at Aetrix Electronics and suitable for real-time inter-processor communication, digital signal processing subsystems, and industrial PLC backplane interfaces requiring stable component supply across extended product lifecycles.

Supply support for 7007S15J8 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, and RF solutions, now part of Renesas Electronics.

The IDT7007 product line was designed specifically for deterministic, low-latency shared-memory architectures in multi-processor embedded systems - emphasizing hardware arbitration, semaphore support, and seamless bus-width expansion.

FAQ

What is the maximum operating temperature range for the 7007S15J8?

The 7007S15J8 is rated for commercial temperature range: 0°C to +70°C. This is explicitly specified in the datasheet's "Recommended DC Operating Conditions" table and confirmed in AC timing tables labeled "7007X15 Com'l Only". Industrial variants (e.g., 7007L20J8) support –40°C to +85°C, but the S15 suffix denotes commercial grade.

Does the 7007S15J8 support true simultaneous read operations from both ports to the same memory address?

Yes, the 7007S15J8 features true dual-ported memory cells that allow simultaneous reads of the same memory location - a core capability highlighted in the "Features" section and verified in Truth Table I. No BUSY assertion or arbitration delay occurs during concurrent reads, enabling lock-free data sharing.

How is semaphore functionality implemented in the 7007S15J8?

The 7007S15J8 implements eight hardware semaphore registers accessed via A0–A2 when SEM = VIL and CE = VIH (Truth Table II). Semaphore read/write uses dedicated control timing (tSOP ≥ 10 ns), and all eight flags are readable on any I/O line - eliminating software polling and reducing inter-CPU coordination latency.

What package type is used for the 7007S15J8, and are there alternatives?

The 7007S15J8 uses a 68-pin PLCC (PLG68) package, as shown in Pin Configuration diagrams and noted in the "Features" list. Alternative packages include 80-pin TQFP (PNG80) and 68-pin PGA (GU68), but the J8 suffix in the part number specifically denotes the PLCC variant per IDT's ordering information.

Can the 7007S15J8 be used in a 16-bit data bus configuration?

Yes, the 7007S15J8 supports 16-bit expansion via master/slave cascading using the M/S pin. When configured as master (M/S = H), BUSY is output; as slave (M/S = L), BUSY is input - enabling two devices to form a 32K × 16 memory without external glue logic, as stated in the "Features" and "Description" sections.