Renesas 7007L55J8

Overview

IDT7007L55J8 from IDT (Integrated Device Technology) is a high-speed 32K × 8 dual-port static RAM with true independent left/right ports, 55 ns maximum read cycle time, 5 V ±10% single-supply operation, and industrial temperature range (–40°C to +85°C). It enables simultaneous asynchronous access to shared memory in real-time inter-processor communication systems such as industrial PLCs and embedded dual-CPU controllers.

For engineers reviewing the IDT7007L55J8 datasheet, IDT7007L55J8 pinout, IDT7007L55J8 application, or IDT7007L55J8 equivalent, key selection criteria include BUSY arbitration timing (tBDD ≤ 40 ns), semaphore flag support (8 flags via A0–A2), interrupt mailbox addressing (7FFE/7FFF), and low-power standby current (ISB3 ≤ 5 µA at full CMOS disable).

Technical Context

The IDT7007L55J8 implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port-no clock required. Its on-chip arbitration logic resolves contention via BUSY flag assertion (push-pull output) when both ports access the same address, with priority determined by tAPS (5 ns setup) and M/S configuration.

It supports two distinct memory access modes: standard RAM access (CE = VIL, SEM = VIH) and semaphore register access (CE = VIH, SEM = VIL), using identical I/O pins but different address decoding (A0–A2 for semaphores). Interrupt signaling uses dedicated INTL/INTR outputs tied to fixed addresses 7FFE_H (left) and 7FFF_H (right).

Key Specifications

Pinout & Package

Package: 80-pin TQFP (14 mm × 14 mm × 1.4 mm), lead-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-55AC and R1EX24032ASAS-55, IDT7007L55J8 uniquely integrates BUSY arbitration, 8 semaphores, and interrupt mailboxes in a single 80-pin TQFP - reducing BOM count by 3–5 discrete components and eliminating timing-critical PCB routing for external logic.

Availability

IDT7007L55J8 is available at Aetrix Electronics and suitable for industrial PLCs, real-time dual-CPU controllers, and motor drive safety systems requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.

Supply support for IDT7007L55J8 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), now part of Renesas Electronics, is a fabless semiconductor company specializing in timing, memory interface, and RF solutions for high-performance computing and industrial systems.

IDT7007L55J8 belongs to the IDT7007 family of dual-port SRAMs designed specifically for deterministic inter-processor communication in real-time embedded systems where hardware arbitration and low-latency synchronization are mandatory.

FAQ

What is the maximum operating temperature range for IDT7007L55J8?

IDT7007L55J8 is rated for industrial temperature operation from –40°C to +85°C. This specification is verified per the manufacturer's datasheet (DSC 2940/16, September 2019) and applies across all DC and AC electrical parameters, including 55 ns access time and BUSY arbitration timing. The device uses CMOS process technology optimized for thermal stability in factory-floor and transportation environments.

Does IDT7007L55J8 support true simultaneous read operations on both ports?

Yes, IDT7007L55J8 supports true simultaneous reads from both ports-even to the same memory location-without contention or BUSY assertion. This capability is enabled by its true dual-ported memory cell architecture, as confirmed in the "Features" section of the datasheet. Simultaneous reads do not affect tRC timing or data validity, making it ideal for mirrored data monitoring applications.

How is semaphore functionality implemented in IDT7007L55J8?

IDT7007L55J8 implements eight hardware semaphore flags accessed via A0–A2 address lines when CE = VIH and SEM = VIL (per Truth Table II). Each flag is a single-bit register written via I/O0 and readable on all I/O lines. This dedicated register space operates independently of main RAM, enabling atomic lock/unlock operations without memory bus contention.

What is the function of the M/S pin on IDT7007L55J8?

The M/S (Master/Slave) pin configures IDT7007L55J8 for system-level arbitration: when M/S = H, BUSYL/BUSYR become push-pull outputs indicating local port contention; when M/S = L, they become inputs accepting BUSY signals from a master device. This enables hierarchical multi-RAM systems without external logic, as documented in the functional block diagram and pin description table.

Can IDT7007L55J8 be used in a 3.3 V system?

No, IDT7007L55J8 requires a single 5.0 V ±10% supply (4.5 V to 5.5 V) and is TTL-compatible. It does not support 3.3 V operation. Interface with 3.3 V controllers requires level translation on all address, control, and I/O lines. The datasheet explicitly specifies VCC = 5.0 V ±10% in DC Operating Conditions (Table 5) and prohibits operation outside this range.