Renesas 7007S25J

Overview

IDT7007S25J from IDT (now Renesas) is a high-speed 32K × 8 dual-port static RAM with true independent left/right ports, 25 ns maximum access time, TTL-compatible 5 V ±10% operation, and integrated hardware semaphore and interrupt logic - used in real-time inter-processor communication systems requiring simultaneous read/write access to shared memory.

For engineers reviewing the IDT7007S25J datasheet, IDT7007S25J pinout, IDT7007S25J application, or IDT7007S25J equivalent, key selection considerations include its 25 ns industrial-grade timing, master/slave arbitration via M/S pin, push-pull BUSY/INT outputs, and support for 16-bit-or-wider bus expansion using cascaded MASTER/SLAVE configuration.

Technical Context

The IDT7007S25J 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 without contention when BUSY arbitration is managed. Its on-chip semaphore logic uses A0–A2 addressing to access eight dedicated flag registers via dedicated SEM control.

It supports two distinct operational modes: RAM access (CE = LOW, SEM = HIGH) and semaphore access (CE = HIGH, SEM = LOW), with separate timing specifications for each. The M/S pin configures BUSY as output (MASTER) or input (SLAVE), enabling deterministic port arbitration in multi-device systems.

Key Specifications

Pinout & Package

Package: 80-pin TQFP (14 mm × 14 mm × 1.4 mm), RoHS-compliant, green part variant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C024AV-25AXC and R1EX24032AS0A, the IDT7007S25J uniquely integrates M/S-configurable BUSY arbitration, hardware semaphores, and mailbox interrupts in a single 5 V device - reducing BOM count and firmware complexity in tightly coupled multi-processor designs.

Availability

IDT7007S25J is available at Aetrix Electronics and suitable for industrial PLC communication, avionics data exchange, and medical imaging subsystems requiring stable component supply with long-term lifecycle support.

Supply support for IDT7007S25J 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

Renesas Electronics (formerly Integrated Device Technology) is a global semiconductor leader specializing in high-performance memory, timing, and interface solutions for industrial, automotive, and communications infrastructure.

The IDT7007S25J belongs to the IDT7000 family of dual-port SRAMs designed specifically for deterministic, low-latency inter-processor communication in real-time embedded systems where hardware arbitration and synchronization primitives are critical.

FAQ

What is the operating temperature range for the IDT7007S25J?

The IDT7007S25J is rated for industrial temperature operation from –40°C to +85°C, making it suitable for deployment in harsh environments such as factory automation controllers, outdoor telecom equipment, and transportation systems where ambient thermal stability is critical. This range is confirmed in the Absolute Maximum Ratings and DC Electrical Characteristics tables of the official datasheet.

Does the IDT7007S25J support true simultaneous read operations from both ports to the same memory address?

Yes, the IDT7007S25J implements true dual-ported memory cells that allow concurrent reads from the same address location on the left and right ports without contention or timing penalty. This capability is explicitly stated in the Features section and verified in Truth Table I (Non-Contention Read/Write Control) of the datasheet.

How does the M/S pin affect BUSY signal behavior on the IDT7007S25J?

When M/S = HIGH, the IDT7007S25J operates as a MASTER: BUSYL and BUSYR are push-pull outputs that assert LOW to indicate port contention. When M/S = LOW, it operates as a SLAVE: BUSYL and BUSYR become inputs that must be driven LOW by a MASTER to inhibit writes - a behavior documented in Note 1 of the Pin Names table and Timing Waveform figures.

Can the IDT7007S25J be used in a 16-bit data bus configuration?

Yes, the IDT7007S25J supports 16-bit-or-wider bus expansion using the MASTER/SLAVE cascading method. By connecting two devices with M/S configured oppositely and sharing BUSY/INT lines, designers achieve full-speed error-free 16-bit operation without discrete glue logic - a capability highlighted in the Features and Description sections of the datasheet.

What are the voltage levels required for reliable interrupt flag operation on the IDT7007S25J?

The IDT7007S25J interrupt flags (INTL and INTR) are push-pull outputs with VOH ≥ 2.4 V and VOL ≤ 0.4 V under IOL = 4 mA / IOH = –4 mA conditions, ensuring direct compatibility with standard TTL inputs. No external pull-up resistors are needed, and interrupt assertion occurs within tINS ≤ 20 ns after valid mailbox write, as specified in Table 15a.