Renesas 7007L35J

Overview

IDT7007L35J from IDT (Integrated Device Technology) is a high-speed 32K × 8 dual-port static RAM with true independent left/right port access, 35 ns maximum read cycle time, industrial temperature range (–40°C to +85°C), and full on-chip semaphore and interrupt logic - used in real-time interprocessor communication systems requiring concurrent memory access without arbitration overhead.

For engineers reviewing the IDT7007L35J datasheet, IDT7007L35J pinout, IDT7007L35J application, or IDT7007L35J equivalent, key selection criteria include BUSY/INT flag timing (tBAA ≤ 20 ns, tINS ≤ 25 ns), dual-port power-down current (ISB3 = 0.2 mA typ.), 5 V ±10% single-supply operation, and compatibility with master/slave cascading for 16-bit+ data bus expansion.

Technical Context

The IDT7007L35J implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port, enabling simultaneous read/write operations - including concurrent reads of the same memory location. Its on-chip arbitration logic resolves contention via BUSY flag assertion (push-pull, not open-drain) when address matches occur across ports.

It supports two distinct memory access modes: standard RAM access (CE = VIL, SEM = VIH) and semaphore register access (CE = VIH, SEM = VIL), with dedicated A0–A2 addressing for eight semaphore flags. Interrupts are triggered by writes to fixed mailbox addresses (7FFE_H for INTL, 7FFF_H for INTR), cleared by subsequent reads.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-35AC and R1EX24032AS0C-35, the IDT7007L35J uniquely integrates semaphore and interrupt logic in a pin-compatible 80-pin footprint, delivering deterministic interprocessor coordination without external components - reducing BOM count and layout complexity in tightly timed embedded systems.

Availability

IDT7007L35J is available at Aetrix Electronics and suitable for industrial PLC communication, avionics data exchange, medical imaging pipelines, and automated test equipment requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for IDT7007L35J 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, RF, and sensor signal conditioning ICs, now part of Renesas Electronics since 2019.

The IDT7007L35J belongs to IDT's high-speed dual-port SRAM product line, designed specifically for real-time interprocessor communication in industrial, aerospace, and medical systems demanding deterministic latency and hardware-managed resource sharing.

FAQ

What is the maximum operating frequency supported by the IDT7007L35J?

The IDT7007L35J does not operate at a fixed clock frequency; it is an asynchronous SRAM. Its speed is defined by timing parameters - notably tRC = 35 ns maximum read cycle time, which corresponds to a theoretical maximum sustained access rate of 28.6 million operations per second per port. Actual system throughput depends on address/control setup/hold times and bus protocol overhead.

Does the IDT7007L35J support true simultaneous read-write operations on different addresses?

Yes, the IDT7007L35J supports fully independent, asynchronous read and write operations on different memory addresses across its left and right ports - with no internal arbitration delay. Simultaneous access to the same address triggers BUSY flag assertion only if write and read overlap in time, not merely by address coincidence.

How is semaphore functionality implemented in the IDT7007L35J?

The IDT7007L35J implements eight hardware semaphore flags accessed via A0–A2 address lines when SEM = VIL and CE = VIH. Each flag is a single-bit latch written via I/O0 and readable on all I/O lines. This eliminates software-based spinlocks and provides atomic, hardware-enforced resource ownership in multi-processor systems.

What is the role of the M/S pin in IDT7007L35J system design?

The M/S pin configures the IDT7007L35J as either master (M/S = H) - where BUSYL/BUSYR are push-pull outputs used to block conflicting writes - or slave (M/S = L) - where those pins become inputs accepting BUSY signals from a master device. This enables hierarchical arbitration in multi-chip 16-bit+ memory systems without external logic.

Can the IDT7007L35J be used in a single-port configuration?

Yes, the IDT7007L35J can operate with only one port enabled (e.g., CEL = VIL, CER = VIH), functioning as a standard 32K × 8 SRAM. The unused port enters standby mode (ISB2 ≤ 110 mA typ.), and its I/O, address, and control pins may be left unconnected or tied to inactive states - simplifying migration from single-port to dual-port architectures.