Renesas 7005S17J8

Overview

7005S17J8 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. It enables simultaneous asynchronous access to the same memory location and supports master/slave cascading for 16-bit+ bus expansion in real-time inter-processor communication systems.

For engineers reviewing the 7005S17J8 datasheet, 7005S17J8 pinout, 7005S17J8 application, or 7005S17J8 equivalent, key selection criteria include its 17 ns commercial-grade timing, dual BUSY/INT flag signaling, on-chip semaphore addressing (A0–A2), battery-backed data retention at 2 V (IDT7005L variant), and 64-pin TQFP package compatibility.

Technical Context

The 7005S17J8 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 without external arbitration logic. Its on-chip arbitration uses BUSY flag assertion based on address match or chip enable timing, with priority set-up time (tAPS) of 5 ns.

It supports two distinct memory access modes: RAM mode (CE = LOW, SEM = HIGH) and semaphore mode (CE = HIGH, SEM = LOW), where eight semaphore flags are addressed via A0–A2 and read/written through I/O0–I/O7. Interrupt flags (INTL/INTR) are set/cleared by writing to dedicated addresses (1FFFh/1FFEh).

Key Specifications

Pinout & Package

7005S17J8 is packaged in a 64-pin thin quad flatpack (TQFP) with 0.5 mm pitch, 14 mm × 14 mm footprint, and 1.4 mm height. Pin 1 marked via corner notch; pins arranged in four 16-pin sides (top/bottom/left/right).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C024AV-15JC and R1EX24002AS0I#U0, the 7005S17J8 delivers superior real-time determinism via on-chip arbitration and semaphore logic, lower pin count (64 vs. 80/100), and direct support for master/slave topology-making it optimal for tightly coupled dual-CPU designs where latency and hardware simplicity are critical.

Availability

7005S17J8 is available at Aetrix Electronics and suitable for real-time inter-processor communication, industrial PLC buffering, and aerospace avionics data sharing requiring stable component supply, long-term lifecycle support, and commercial-grade 17 ns timing performance.

Supply support for 7005S17J8 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 product line was designed for high-reliability dual-processor systems requiring deterministic memory access, hardware-based arbitration, and seamless bus expansion-targeting aerospace, industrial automation, and medical imaging applications.

FAQ

What is the maximum operating speed of the 7005S17J8?

The 7005S17J8 has a maximum read cycle time (tRC) of 17 ns, meaning it supports up to approximately 58.8 MHz sustained read access on either port. This timing is guaranteed over the commercial temperature range (0°C to +70°C) and applies to both RAM and semaphore access modes when operated within specified voltage and load conditions.

Does the 7005S17J8 support battery backup operation?

The 7005S17J8 is the standard-speed commercial variant and does not include battery backup capability. Battery-backed data retention at 2 V is only supported by the IDT7005L series (e.g., 7005L17J8). The 'S' suffix denotes standard power consumption (750 mW typical active), while 'L' indicates low-power design optimized for retention.

How does the M/S pin affect BUSY signal behavior on the 7005S17J8?

When M/S = HIGH, the 7005S17J8 operates as a master: BUSYL and BUSYR are push-pull outputs that assert LOW during port contention. When M/S = LOW, it operates as a slave: BUSYL and BUSYR become inputs that must be driven LOW by an external master to inhibit writes-enabling hierarchical arbitration in multi-device systems.

Can the 7005S17J8 perform simultaneous read and write operations on the same memory address?

No-the 7005S17J8 prevents simultaneous write/write or read/write conflicts to the same address via hardware arbitration. If both ports attempt access to identical addresses, the BUSY flag asserts to block the later-arriving operation. Simultaneous reads to the same location are fully supported and produce valid data on both ports without contention.

What package type is used for the 7005S17J8 and what are its key mechanical dimensions?

The 7005S17J8 uses a 64-pin thin quad flatpack (TQFP) package with 0.5 mm lead pitch. Its body measures 14 mm × 14 mm × 1.4 mm, conforming to JEDEC MO-220 standards. This package supports fine-pitch surface-mount assembly and provides thermal and electrical performance suitable for high-density industrial PCB layouts.