Renesas 7007S15J

Overview

IDT7007S15J from IDT (Integrated Device Technology) 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 and interrupt logic - used in real-time inter-processor communication systems such as industrial PLCs and embedded dual-CPU controllers.

For engineers reviewing the IDT7007S15J datasheet, IDT7007S15J pinout, IDT7007S15J application, or IDT7007S15J equivalent, key selection considerations include port arbitration timing (tBDD ≤ 18 ns), BUSY flag behavior under M/S = H/L configuration, dual-port power-down current (ISB3 ≤ 0.2 mA), and compatibility with 68-pin PLCC PCB layouts.

Technical Context

The IDT7007S15J implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port. It supports simultaneous read–read access to identical memory locations and uses hardware-based arbitration via push-pull BUSY outputs and master/slave select (M/S) to resolve contention during concurrent writes.

Its on-chip semaphore logic enables eight shared flags accessed via A0–A2 with dedicated SEM enable pins, while interrupt signaling operates through fixed mailbox addresses (7FFE_H for INTL, 7FFF_H for INTR), requiring no external logic for inter-processor handshaking.

Key Specifications

Pinout & Package

68-pin PLCC package with 22.9 mm × 22.9 mm body size and 0.17 inch height; requires all VCC and GND pins to 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 CY7C136-15VC and AS7C33256B-15JC, the IDT7007S15J uniquely integrates arbitration, semaphore, and interrupt hardware - reducing BOM count and PCB area in tightly coupled dual-CPU systems where deterministic IPC is mandatory.

Availability

IDT7007S15J is available at Aetrix Electronics and suitable for industrial PLC backplanes, dual-core embedded controllers, and real-time data acquisition systems requiring stable component supply and long-term obsolescence management.

Supply support for IDT7007S15J 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 Electronics in 2019.

The IDT7007S15J belongs to IDT's high-speed dual-port SRAM product line, designed specifically for deterministic inter-processor communication in real-time embedded systems where hardware arbitration and low-latency signaling are essential.

FAQ

What is the maximum operating frequency supported by the IDT7007S15J?

The IDT7007S15J supports a maximum read cycle time (tRC) of 15 ns, enabling operation up to approximately 66.7 MHz in ideal conditions. This value is specified for commercial temperature range (0°C to +70°C) with VCC = 5.0 V ±10%. The actual achievable frequency depends on system-level timing margins, including address setup/hold and output enable delays. IDT7007S15J does not include internal clock circuitry - it is an asynchronous device driven entirely by external control signals.

How does the BUSY arbitration logic function in the IDT7007S15J when configured as a Master?

When M/S = H (Master), BUSYL and BUSYR are push-pull outputs. If both ports attempt a write to the same address simultaneously, the port with earlier stable address and control inputs asserts its BUSY signal first, blocking the later port's write. The IDT7007S15J guarantees tAPS ≥ 5 ns setup time and tBDD ≤ 18 ns disable-to-valid-data delay. This hardware arbitration prevents data corruption without CPU involvement - a core feature distinguishing IDT7007S15J from basic dual-port RAMs.

Can the IDT7007S15J be used in a Slave-only configuration without a Master device?

Yes, the IDT7007S15J can operate as a standalone Slave with M/S = L. In this mode, BUSYL and BUSYR become inputs, and external logic (e.g., another IDT7007S15J in Master mode) must drive them to control write access. The IDT7007S15J retains full dual-port functionality - reads and writes proceed normally when BUSY inputs are high. No Master device is required if contention is managed externally or if only one port is actively written at a time.

What are the valid interrupt mailbox addresses for the IDT7007S15J and how are they triggered?

The IDT7007S15J uses fixed interrupt mailbox addresses: writing to 7FFE_H (hex) with CER = R/WR = VIL sets the left-port interrupt flag (INTL), and writing to 7FFF_H with CEL = R/WL = VIL sets the right-port flag (INTR). Clearing is performed by reading the same address with OE and CE active. These locations reside within the main 32K × 8 memory map and retain user data - the IDT7007S15J treats them as standard SRAM unless used for interrupt signaling.

Is the IDT7007S15J pin-compatible with other speed grades in the IDT7007 family?

Yes, all IDT7007 variants - including IDT7007S15J (15 ns), IDT7007S20J (20 ns), and IDT7007S25J (25 ns) - share identical 68-pin PLCC pinouts and electrical interfaces. Speed grade differences affect only AC timing parameters (e.g., tAA, tRC, tPD); DC characteristics, pin functions, and package dimensions remain consistent. This allows design reuse across performance tiers without PCB revision - a key advantage for scalable product families using IDT7007S15J.