Renesas 7007L55J

Overview

IDT7007L55J 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, 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 IDT7007L55J datasheet, IDT7007L55J pinout, IDT7007L55J application, or IDT7007L55J equivalent, key selection considerations include its 80-pin TQFP package, master/slave cascading capability via M/S pin, BUSY flag arbitration timing (tBDD ≤ 40 ns), and dual-port DC/AC electrical specs across industrial voltage (4.5–5.5 V) and temperature conditions.

Technical Context

The IDT7007L55J implements fully asynchronous dual-port operation with separate address, control, and I/O buses per port - enabling simultaneous reads of identical memory locations. Its on-chip arbitration logic resolves contention using either CE-controlled or address-match BUSY assertion, with tAPS = 5 ns setup for priority resolution.

It supports two distinct memory access modes: standard RAM access (CE = LOW, SEM = HIGH) and semaphore register access (CE = HIGH, SEM = LOW), with eight dedicated semaphore flags addressed by A0–A2 and written via I/O0. Interrupt flags (INTL/INTR) are triggered by writes to fixed mailbox addresses (7FFEh/7FFFh).

Key Specifications

Pinout & Package

Package: 80-pin Thin Quad Flat Pack (TQFP), body size 14 mm × 14 mm × 1.4 mm, lead pitch 0.5 mm, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-55AXC and AS7C33256B-55TIN, the IDT7007L55J delivers integrated hardware arbitration, semaphore, and interrupt features in a single chip - reducing BOM count, PCB area, and firmware complexity for real-time interprocessor communication.

Availability

IDT7007L55J is available at Aetrix Electronics and suitable for industrial PLCs, avionics subsystems, and medical imaging equipment requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.

Supply support for IDT7007L55J 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 solutions, now part of Renesas Electronics since 2019.

The IDT7007L55J belongs to IDT's high-speed dual-port SRAM product line, designed specifically for deterministic real-time interprocessor communication in industrial, aerospace, and medical systems where concurrent memory access and hardware arbitration are critical.

FAQ

What is the maximum operating temperature range for the IDT7007L55J?

The IDT7007L55J is rated for industrial temperature operation from –40°C to +85°C, validated across full voltage (4.5–5.5 V) and timing specifications. This range is confirmed in the Absolute Maximum Ratings and DC Electrical Characteristics tables of the official datasheet, and applies to all AC timing parameters including tRC = 55 ns and tBDD ≤ 40 ns.

Does the IDT7007L55J support true simultaneous read operations on both ports?

Yes, the IDT7007L55J implements true dual-ported memory cells that permit simultaneous reads of the same memory location on left and right ports without contention or delay. This behavior is explicitly stated in the Features section and enabled by independent address, control, and I/O circuitry - no BUSY assertion occurs during concurrent reads.

How does the M/S pin affect BUSY signal behavior on the IDT7007L55J?

When M/S = HIGH, the IDT7007L55J operates as a MASTER: BUSYL and BUSYR are push-pull outputs reflecting port arbitration status. When M/S = LOW, it operates as a SLAVE: BUSYL and BUSYR become inputs that inhibit local writes when driven LOW by a MASTER device - enabling hierarchical multi-device memory expansion.

What are the valid address ranges for interrupt mailbox functionality in the IDT7007L55J?

The IDT7007L55J uses fixed addresses 7FFEh (hex) to set the left port interrupt flag (INTL) and 7FFFh (hex) to set the right port interrupt flag (INTR). These locations function as user-defined mailboxes - writing to them with correct CE/R/W conditions asserts the corresponding flag; reading clears it, as defined in Truth Table III of the datasheet.

Can the IDT7007L55J be used in a 16-bit data bus configuration?

Yes, the IDT7007L55J supports 16-bit expansion via MASTER/SLAVE cascading using the M/S pin. Two devices can be configured - one as MASTER (M/S = HIGH), one as SLAVE (M/S = LOW) - with BUSY signals coordinating access, enabling full-speed 16-bit word access without external logic or timing penalties.