Renesas 7008S55G

Overview

IDT7008S55G from Integrated Device Technology (IDT) is a high-speed 64K × 8 true dual-ported static RAM with independent left/right ports, 55 ns max access time, TTL-compatible 5V ±10% operation, and integrated semaphore/arbitration logic for inter-processor communication in real-time embedded systems.

For engineers reviewing the IDT7008S55G datasheet, IDT7008S55G pinout, IDT7008S55G application, or IDT7008S55G equivalent, key selection criteria include port-to-port contention handling via BUSY flag, master/slave cascading capability, industrial-grade temperature support (–40°C to +85°C), and low-power standby modes (1 mW typ. for IDT7008L variant).

Technical Context

The IDT7008S55G implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port-enabling simultaneous read/write operations to the same memory location. Its on-chip arbitration logic resolves port conflicts using push-pull BUSY flags and supports both address-match and CE-controlled arbitration timing.

It integrates hardware semaphore signaling across eight flags (addressed by A0–A2), with dedicated SEM enable pins and non-tri-state interrupt outputs (INTL/INTR). The device operates in MASTER (M/S = VIH) or SLAVE (M/S = VIL) mode to enable depth expansion without external logic.

Key Specifications

Pinout & Package

Package: 100-pin TQFP (thin quad flatpack), body size ≈ 14 mm × 14 mm × 1.4 mm; 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-55AC and R1EX24064ASAS-55, the IDT7008S55G delivers native 8-bit dual-port operation with integrated arbitration-reducing BOM count, PCB area, and firmware complexity in tightly coupled multi-processor designs.

Availability

IDT7008S55G is available at Aetrix Electronics and suitable for real-time inter-processor communication, industrial PLCs, and avionics data acquisition systems requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.

Supply support for IDT7008S55G 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

Integrated Device Technology (IDT) is a fabless semiconductor company specializing in timing, memory interface, RF, and sensor signal conditioning ICs for communications, computing, and industrial markets.

The IDT7008S55G belongs to IDT's high-speed dual-port SRAM product line, engineered specifically for deterministic, low-latency inter-processor communication in safety-critical embedded systems.

FAQ

What is the maximum operating temperature range supported by the IDT7008S55G?

The IDT7008S55G is qualified for industrial temperature operation from –40°C to +85°C. This rating applies across all speed grades including the 55 ns version, and is verified per JEDEC JESD22-A108. The device maintains full functionality-including BUSY arbitration, semaphore access, and interrupt generation-within this full range.

How does the IDT7008S55G resolve simultaneous access to the same memory address from both ports?

The IDT7008S55G uses hardware-based arbitration via its BUSY flag logic. When both ports attempt access to the same address, the port meeting the tAPS (arbitration priority setup) timing of 5 ns first asserts its BUSY output (in MASTER mode) or detects BUSY input (in SLAVE mode), blocking the conflicting write. This ensures deterministic, cycle-accurate resolution without software intervention.

Can the IDT7008S55G be used in a 16-bit data bus configuration?

Yes-the IDT7008S55G supports 16-bit or wider data paths via MASTER/SLAVE cascading. Two IDT7008S55G devices can be configured with one as MASTER (M/S = VIH) and the other as SLAVE (M/S = VIL), enabling full-speed 16-bit operation without external logic. The BUSY and semaphore signals coordinate access across both devices transparently.

What is the function of the SEM pins on the IDT7008S55G?

The SEML and SEMR pins enable hardware semaphore register access. When SEM = VIL and CE = VIH, the device routes A0–A2 to eight internal semaphore flags instead of the RAM array. I/O0 writes the flag value; I/O0–I/O7 read it. This provides atomic lock/unlock operations without CPU intervention or memory-mapped software overhead.

Does the IDT7008S55G require external pull-up resistors on BUSY or INT pins?

No-BUSYL, BUSYR, INTL, and INTR are push-pull (totem-pole) outputs per datasheet Note 2. They drive actively high or low without external pull-ups. This simplifies board design and ensures clean signal edges compatible with TTL and CMOS logic families directly.