Renesas 7005S17JI8

Overview

7005S17JI8 from IDT is a high-speed 8K × 8 dual-port static RAM with true independent left/right ports, 17 ns maximum read cycle time (tRC), TTL-compatible 5 V ±10% supply, and integrated hardware semaphore/arbitration logic for real-time inter-processor communication in embedded control systems.

For engineers reviewing the 7005S17JI8 datasheet, 7005S17JI8 pinout, 7005S17JI8 application, or 7005S17JI8 equivalent, key selection criteria include simultaneous port access capability, BUSY/INT flag timing (tBAA ≤17 ns, tINS ≤15 ns), industrial temperature support (−40°C to +85°C), and 64-pin TQFP package compatibility with memory expansion via M/S cascading.

Technical Context

The 7005S17JI8 implements fully asynchronous dual-port operation with separate address, data, and control buses per port (A0L–A12L/I/O0L–I/O7L/R/WL/CEL/OEL on left; A0R–A12R/I/O0R–I/O7R/R/WR/CER/OER on right), enabling concurrent reads/writes to any memory location without external logic. Its on-chip arbitration uses push-pull BUSY outputs (M/S = H) or inputs (M/S = L) to resolve contention at the address or chip-enable level.

Hardware semaphore signaling operates via dedicated SEM pins and I/O0–I/O7, supporting eight flags addressed by A0–A2, with guaranteed tSOP = 10 ns pulse width and tSWRD = 5 ns write-to-read latency. Data retention at 2 V (IDT7005L variant) is not applicable to this S-version part.

Key Specifications

Pinout & Package

7005S17JI8 is housed in a 64-pin TQFP (PNG64) package with 0.5 mm pitch, body size 14 mm × 14 mm × 1.4 mm. All VCC and GND pins must be connected per datasheet note; N/C pins are internally unconnected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C024AV-15AXC and IDT70V25L15PF, the 7005S17JI8 offers drop-in compatibility with existing 5 V industrial control hardware, guaranteed −40°C to +85°C operation without derating, and proven arbitration reliability in safety-critical deployments where voltage translation adds failure modes.

Availability

7005S17JI8 is available at Aetrix Electronics and suitable for real-time industrial PLCs, avionics flight control systems, and medical imaging data buffering requiring stable component supply across extended product lifecycles.

Supply support for 7005S17JI8 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, acquired by Renesas Electronics in 2019.

The IDT7005 family was designed specifically for deterministic inter-processor communication in embedded control systems, emphasizing hardware arbitration, semaphore support, and industrial temperature reliability over raw density or speed.

FAQ

What is the maximum operating frequency supported by the 7005S17JI8?

The 7005S17JI8 does not operate on a clock signal; its maximum effective bandwidth is determined by the 17 ns read cycle time (tRC), enabling up to 58.8 million 8-bit words per second per port under ideal asynchronous conditions. This corresponds to a theoretical 470 Mbps per port when continuously cycling addresses and data.

Does the 7005S17JI8 support battery backup for data retention?

No, the 7005S17JI8 is the 'S' (standard power) variant and does not support battery backup operation. Data retention at 2 V is exclusive to the 'L' (low-power) versions like IDT7005L. The 7005S17JI8 requires continuous 5 V supply to maintain memory contents.

How does the M/S pin affect BUSY signal behavior on the 7005S17JI8?

When M/S = H, BUSYL and BUSYR function as push-pull outputs asserting active-low during port contention; when M/S = L, they become inputs accepting external BUSY signals from a master device. This enables hierarchical arbitration in multi-chip configurations without external logic.

Can the 7005S17JI8 be used in a 16-bit data bus configuration?

Yes, the 7005S17JI8 supports 16-bit expansion via Master/Slave cascading: one device operates as master (M/S = H) and another as slave (M/S = L), with BUSY signals interconnected. This configuration maintains full 17 ns speed without additional discrete logic, as specified in the IDT7005 functional description.

What is the purpose of the SEM pins on the 7005S17JI8?

The SEML and SEMR pins enable hardware semaphore register access on their respective ports. When asserted, they route I/O0–I/O7 to an internal 8-flag semaphore space addressed by A0–A2, providing atomic test-and-set operations essential for real-time OS task synchronization without software intervention.