Renesas 7005S55J

Overview

7005S55J from IDT is a high-speed 8K × 8 dual-port static RAM with true independent left/right ports, 55 ns max read cycle time (tRC), TTL-compatible 5V ±10% supply, and on-chip semaphore/arbitration logic-used in real-time inter-processor communication, military avionics data buffers, and redundant control systems requiring simultaneous access without contention.

For engineers reviewing the 7005S55J datasheet, 7005S55J pinout, 7005S55J application, or 7005S55J equivalent, this page delivers verified timing specs (tRC = 55 ns, tAA ≤ 55 ns), dual-port arbitration behavior (M/S-selectable master/slave mode), BUSY/INT flag timing, and package-specific pin mapping for the 64-pin TQFP (PNG64) variant.

Technical Context

The 7005S55J implements fully asynchronous dual-port operation: each port (left/right) has independent address (A0L–A12L / A0R–A12R), data (I/O0L–I/O7L / I/O0R–I/O7R), and control lines (CEL/CER, R/WL/R/WR, OEL/OER). It supports simultaneous reads of the same memory location and uses hardware semaphore flags (8 flags, addressed via A0–A2) with dedicated SEM pins and contention resolution logic.

Arbitration is implemented via push-pull BUSY outputs (when M/S = H) or BUSY inputs (when M/S = L), with priority set-up time tAPS = 5 ns and BUSY disable-to-valid-data delay tBDD ≤ 40 ns. The device operates across military temperature range (−55°C to +125°C) and supports battery backup data retention at VCC = 2V.

Key Specifications

Pinout & Package

7005S55J is packaged in a 64-pin thin quad flatpack (TQFP), designated PNG64, with body dimensions 14 mm × 14 mm × 1.4 mm. Pin assignments are defined per the official IDT pinout diagram (drawing 2738 drw 03).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-55AXC and IDT70V25L25PF, the 7005S55J uniquely combines military temperature qualification, 5 V TTL compatibility, on-chip semaphore/arbitration, and 2 V data retention-making it irreplaceable in legacy and new-design military embedded systems where reliability and deterministic timing are mandatory.

Availability

7005S55J is available at Aetrix Electronics and suitable for avionics data buffering, military radar signal processing, and redundant control systems requiring stable component supply across extended lifecycle and obsolescence-sensitive programs.

Supply support for 7005S55J 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 IDT7005 family was designed specifically for high-reliability dual-ported memory applications in defense, aerospace, and industrial control-emphasizing deterministic arbitration, military-grade qualification, and seamless master/slave scalability.

FAQ

What is the maximum operating temperature range for the 7005S55J?

The 7005S55J is rated for the full military temperature range of −55°C to +125°C, as specified in MIL-PRF-38535 QML compliance documentation. This qualifies it for deployment in harsh environments including airborne, ground vehicle, and shipboard military systems where thermal extremes are routine.

Does the 7005S55J support battery backup operation, and what voltage is required?

Yes, the 7005S55J supports battery backup data retention at VCC = 2.0 V minimum, with ICCDR ≤ 4000 µA across the military temperature range. This allows the device to retain stored data during main power interruption-critical for fault-tolerant and safety-critical systems.

How does the M/S pin affect BUSY signal behavior on the 7005S55J?

When M/S = H, BUSYL and BUSYR function as push-pull outputs indicating port contention; when M/S = L, they become inputs used by the device as a slave to accept BUSY assertions from a master device. This enables hierarchical arbitration in multi-chip configurations without external logic.

What is the purpose of the SEM pins on the 7005S55J, and how are semaphore flags accessed?

The SEML and SEMR pins enable access to eight on-chip semaphore registers. When SEM = L and CE = H, address bits A0–A2 select one of eight flags; I/O0 writes the flag, and I/O0–I/O7 read its state. This provides atomic lock management without software intervention or external components.

Is the 7005S55J pin-compatible with other variants in the IDT7005 family, such as the 7005S20J?

Yes-the 7005S55J shares identical pinout, package (PNG64), and signal definitions with all IDT7005 S/L-series variants. Only timing parameters (e.g., tRC = 55 ns vs. 20 ns) and DC characteristics differ; no PCB layout change is needed when upgrading or downgrading speed grades within the same package.