Renesas 7005S15JI8

Overview

7005S15JI8 from IDT is a high-speed 8K × 8 (64 Kbit) true dual-port static RAM with independent left/right ports, 15 ns maximum read cycle time (tRC), TTL-compatible 5 V ±10% supply, and industrial temperature range (–40°C to +85°C). It enables simultaneous asynchronous 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 7005S15JI8 datasheet, 7005S15JI8 pinout, 7005S15JI8 application, or 7005S15JI8 equivalent, key selection considerations include BUSY-flag arbitration timing (tBAA ≤ 15 ns), semaphore-controlled inter-port signaling, battery-backed data retention at 2 V, and compatibility with 64-pin TQFP layout constraints.

Technical Context

The 7005S15JI8 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 reads/writes without external logic. Its on-chip arbitration logic resolves contention via BUSY flag assertion (push-pull output) and M/S pin configuration-M/S = H configures master mode with BUSYL/BUSYR as outputs; M/S = L configures slave mode with BUSYL/BUSYR as inputs.

It integrates full hardware semaphore support (8 flags addressed by A0–A2), interrupt flag generation (INTL/INTR), and automatic power-down via CE-driven standby modes. The device uses CMOS process technology and supports data retention down to 2 V, with typical active power of 750 mW and standby power of 5 mW.

Key Specifications

Pinout & Package

7005S15JI8 is housed in a 64-pin thin quad flatpack (TQFP) package with 0.5 mm pitch, body size 14 mm × 14 mm × 1.4 mm. All VCC pins require local decoupling; all GND pins must be connected to system ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C024AV-15JC and R1EX24002AS0C-15#U0, the 7005S15JI8 uniquely combines 64-pin TQFP packaging, integrated hardware semaphores, and 5 mW standby power - making it optimal for compact, low-power, multi-processor industrial controllers where arbitration logic must be self-contained.

Availability

7005S15JI8 is available at Aetrix Electronics and suitable for industrial automation, avionics subsystems, and real-time communications equipment requiring stable component supply, long-term lifecycle assurance, and MIL/IND-grade reliability.

Supply support for 7005S15JI8 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 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 deterministic, low-latency inter-processor communication in embedded systems demanding true dual-port SRAM with hardware arbitration - targeting industrial control, military computing, and telecom infrastructure.

FAQ

What is the maximum operating temperature range for the 7005S15JI8?

The 7005S15JI8 is rated for industrial temperature operation from –40°C to +85°C. This specification is confirmed in the "Recommended DC Operating Conditions" table (Table 2738 tbl 05) and applies to the J-grade variant denoted by the 'J' in the suffix. It is not rated for commercial (0°C to +70°C) or military (–55°C to +125°C) ranges.

Does the 7005S15JI8 support battery backup operation, and what voltage is required?

Yes, the 7005S15JI8 supports battery backup operation with guaranteed data retention down to 2.0 V (VDR = 2.0 V), as specified in Table 2738 tbl 09. This feature is inherent to the "L" (low-power) variant in the IDT7005S/L family, and the 7005S15JI8 implements this capability with typical data retention current of 100 µA.

How does the M/S pin affect BUSY signal behavior on the 7005S15JI8?

When M/S = HIGH, the 7005S15JI8 operates as a master: BUSYL and BUSYR are push-pull outputs that assert during port contention. When M/S = LOW, it operates as a slave: BUSYL and BUSYR become inputs that must be driven externally (e.g., by a master device) to inhibit writes - as documented in Notes 1 and 2 of the Pin Names table (2738 tbl 01).

Can the 7005S15JI8 perform simultaneous reads from both ports to the same memory address?

Yes, the 7005S15JI8 supports true simultaneous reads to the same memory location from both left and right ports without arbitration delay or data corruption. This capability is explicitly stated in the "Features" section: "True Dual-Ported memory cells which allow simultaneous reads of the same memory location." No BUSY assertion occurs during concurrent reads.

What package type is used for the 7005S15JI8, and are there alternative packages for this speed grade?

The 7005S15JI8 uses a 64-pin thin quad flatpack (TQFP) package, as confirmed by the "Pin Configurations" diagram (2738 drw 03) and ordering information notes. While the IDT7005S/L family also offers 68-pin PGA and PLCC variants, the 'I8' suffix specifically denotes the TQFP option - no other package types are available for the 15 ns speed grade in industrial temperature.