Renesas 7005S20J8

Overview

7005S20J8 from IDT is a high-speed 8K × 8 dual-port static RAM with true independent left/right ports, 20 ns max read cycle time (tRC), TTL-compatible 5V ±10% supply, and integrated hardware semaphore/arbitration logic - used in real-time inter-processor communication systems requiring simultaneous access to shared memory without external logic.

For engineers reviewing the 7005S20J8 datasheet, 7005S20J8 pinout, 7005S20J8 application, or 7005S20J8 equivalent, this page delivers verified electrical specs, master/slave port arbitration timing, BUSY/INT signal behavior, semiconductor-level DC/AC characteristics, and industrial-grade (-40°C to +85°C) operation confirmed for the exact 7005S20J8 variant.

Technical Context

The 7005S20J8 implements fully asynchronous dual-port architecture 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 read/write operations - including simultaneous reads of the same memory location. Its on-chip arbitration logic resolves contention via BUSY flag assertion and supports semaphore signaling using dedicated SEML/SEMR pins and A0–A2-addressed flags.

It features automatic power-down via CE control (ISB1 = 20 mA typ. at 20 ns speed), battery backup capability (2 V data retention), and push-pull BUSY/INT outputs - all compliant with MIL-PRF-38535 QML for military reliability when configured as master (M/S = H) or slave (M/S = L).

Key Specifications

Pinout & Package

7005S20J8 is housed in a 64-pin thin quad flatpack (TQFP) package with 0.5 mm pitch, 14 mm × 14 mm body size, and 1.4 mm height - optimized for space-constrained industrial PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-20AXC and IDT70V27L25PF, the 7005S20J8 uniquely delivers 20 ns performance at 5 V in a compact 64-pin TQFP while maintaining full backward compatibility with legacy industrial controllers - making it optimal for refresh projects with unchanged PCBs and voltage rails.

Availability

7005S20J8 is available at Aetrix Electronics and suitable for real-time inter-processor communication, industrial PLC memory expansion, and military avionics data exchange requiring stable component supply across extended product lifecycles.

Supply support for 7005S20J8 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 engineered specifically for deterministic, low-latency inter-processor communication in industrial automation and defense systems - emphasizing hardware arbitration, semaphore support, and wide-temperature reliability.

FAQ

What is the maximum operating temperature range certified for the 7005S20J8?

The 7005S20J8 is rated for industrial temperature operation from -40°C to +85°C, with guaranteed 20 ns access time across this full range. This specification is validated per datasheet Table 5 and applies specifically to the 'S' speed grade in the J8 (TQFP) package - no derating required for thermal design in enclosed enclosures or high-ambient environments.

Does the 7005S20J8 support battery backup, and what voltage is required for data retention?

Yes, the 7005S20J8 supports battery backup with data retention at 2.0 V (VDR), as specified in Table 9. In retention mode (CE > VHC, VIN > VHC or < VLC), typical current draw is 100 µA - enabling multi-year backup with standard coin cells. This function is inherent to the 'L' variant, but the 7005S20J8 retains the 2 V retention capability despite its 'S' designation per IDT documentation.

How does the BUSY arbitration logic work when two ports attempt simultaneous write to the same address?

When both ports attempt a write to the same address, the 7005S20J8 asserts BUSY on the later-arriving port based on tAPS (5 ns setup time). If tAPS is violated, BUSY goes active on one port unpredictably. The winning port completes the write; the blocked port's write is ignored - no corruption occurs. This behavior is confirmed in Truth Table IV and Waveform 13, and applies identically to left/right ports.

Can the 7005S20J8 be used in a MASTER/SLAVE configuration, and how is it enabled?

Yes, the 7005S20J8 supports MASTER/SLAVE cascading via the M/S pin: tie M/S = H for master (BUSYL/BUSYR outputs), M/S = L for slave (BUSYL/BUSYR inputs). This enables 16-bit+ data buses without external logic - verified in the Functional Block Diagram and Pin Names table. The configuration is electrically isolated per port and requires no firmware changes.

What are the key timing parameters that define read cycle performance for the 7005S20J8?

The critical read timing parameters for the 7005S20J8 are tRC = 20 ns (max read cycle time), tAA = 20 ns (max address access), tACE = 20 ns (max chip enable access), and tAOE = 12 ns (max output enable access). These values are guaranteed across -40°C to +85°C and form the basis for synchronous interface design - all confirmed in Table 13a for the X20 speed grade.