Renesas 7005S20J

Overview

7005S20J from IDT is a high-speed 8K × 8 dual-port static RAM with true independent left/right ports, 20 ns max access time (commercial/industrial/military), TTL-compatible 5V ±10% supply, and on-chip semaphore/arbitration logic. It enables simultaneous read/write access to the same memory location and supports MASTER/SLAVE cascading for 16-bit+ data bus expansion in real-time inter-processor communication systems.

For engineers reviewing the 7005S20J datasheet, 7005S20J pinout, 7005S20J application, or 7005S20J equivalent, this device is selected for deterministic port arbitration, battery-backed data retention down to 2V, and push-pull BUSY/INT signaling in embedded control, military avionics, and industrial PLC co-processor architectures.

Technical Context

The 7005S20J implements fully asynchronous dual-port operation with separate address, control, and I/O buses per port (A0L–A12L/I/O0L–I/O7L and A0R–A12R/I/O0R–I/O7R), enabling concurrent access without external logic. Its on-chip arbitration uses M/S pin configuration to assign BUSY as output (MASTER) or input (SLAVE), with tAPS = 5 ns priority setup time ensuring deterministic contention resolution.

It integrates dedicated semaphore registers (8 flags, addressed via A0–A2) accessible via SEM-controlled cycles, and supports both R/W- and CE-controlled write timing. BUSY assertion is triggered by address match or chip enable, with tBDD ≤ 30 ns (M/S = VIH) guaranteeing valid data before BUSY deassertion during port-to-port reads.

Key Specifications

Pinout & Package

7005S20J is packaged in a 64-pin thin quad flatpack (TQFP, package code PNG64), measuring 14 mm × 14 mm × 1.4 mm, with exposed pad for thermal dissipation and standard JEDEC MO-220 footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-20AXC and IDT70V25S20PF, the 7005S20J uniquely delivers 5V TTL compatibility, MIL-PRF-38535 qualification, and 2V battery retention in a compact 64-pin TQFP-making it irreplaceable in legacy 5V military and industrial control systems requiring long-term supply stability.

Availability

7005S20J is available at Aetrix Electronics and suitable for real-time inter-processor communication, military avionics data buffering, and industrial PLC co-processor interfaces requiring stable component supply across extended product lifecycles.

Supply support for 7005S20J 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, and RF solutions, now part of Renesas Electronics since 2019.

The IDT7005 family was designed specifically for deterministic dual-processor memory sharing in aerospace, defense, and industrial automation-prioritizing hardware arbitration, data integrity under stress, and long-term obsolescence mitigation.

FAQ

What is the maximum operating temperature range supported by the 7005S20J?

The 7005S20J is qualified for military-grade operation from −55°C to +125°C, industrial-grade from −40°C to +85°C, and commercial-grade from 0°C to +70°C. This wide range is achieved through process hardening and screening per MIL-PRF-38535 QML standards, making it suitable for engine-mounted avionics and outdoor industrial controllers where ambient extremes occur.

Does the 7005S20J support battery backup operation, and what is the minimum retention voltage?

Yes, the 7005S20J supports battery backup operation with a minimum data retention voltage of 2.0 V. In retention mode (VCC = 2V, CE high), ICCDR is guaranteed ≤4000 µA for military/industrial grades, enabling reliable state preservation during main power failure in critical systems like flight recorders or emergency shutdown controllers.

How does the M/S pin configure the 7005S20J for master/slave operation?

The M/S pin configures the 7005S20J as MASTER (M/S = H) or SLAVE (M/S = L). In MASTER mode, BUSYL and BUSYR are push-pull outputs that assert during port contention; in SLAVE mode, they become inputs that inhibit writes when driven low by a MASTER. This enables deterministic cascading of multiple devices for wider data buses without external logic.

What is the purpose of the SEM pin, and how is it used in semaphore operations?

The SEM pin (SEML/SEMR) enables semaphore register access instead of memory array access. When SEM = L and CE = H, the device decodes A0–A2 to select one of eight hardware semaphore flags, allowing atomic test-and-set operations between ports. This eliminates race conditions in multi-processor synchronization without software overhead or external latches.

Is the 7005S20J pin-compatible with other members of the IDT7005 family, such as the 7005S15J or 7005S25J?

Yes, all IDT7005S-xJ variants (including 7005S15J, 7005S20J, and 7005S25J) share identical 64-pin TQFP pinout, electrical interface, and functional architecture. Only access time and AC timing parameters differ; PCB layout and firmware remain unchanged across speed grades, simplifying design reuse and lifecycle management.