Renesas 7005L17J

Overview

7005L17J from IDT is a high-speed 8K × 8 (64 Kbit) true dual-port static RAM with independent left/right ports, 17 ns maximum read cycle time (tRC), 1 mA typical standby current, and TTL-compatible 5 V ±10% operation - used in real-time inter-processor communication, video frame buffers, and military-grade avionics data exchange systems.

For engineers reviewing the 7005L17J datasheet, 7005L17J pinout, 7005L17J application, or 7005L17J equivalent, this page delivers verified timing specs, master/slave arbitration behavior, semaphore flag access timing, BUSY-controlled port contention resolution, and battery-backed 2 V data retention capability.

Technical Context

The 7005L17J implements fully asynchronous dual-port architecture with separate address, control, and I/O buses for left (L) and right (R) ports, enabling simultaneous read/write to the same memory location without collision. It integrates on-chip arbitration logic, push-pull BUSY/INT flags, and eight hardware semaphores addressed via A0–A2.

Its low-power L-version uses CMOS process to achieve 700 mW active power (typ.) and 1 µA standby current (typ.), supporting battery backup down to 2 V with guaranteed data retention. The M/S pin configures master (BUSY output) or slave (BUSY input) mode for cascaded 16-bit+ memory expansion.

Key Specifications

Pinout & Package

64-pin TQFP package (PNG64) with 0.5 mm pitch; body dimensions 14 mm × 14 mm × 1.4 mm; requires all VCC pins connected to 5 V supply and all GND pins tied to ground.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C024AV-15AXC and IDT70V25L17PF, the 7005L17J uniquely combines 5 V TTL compatibility, 2 V data retention, industrial temperature rating, and M/S-configurable cascade - making it irreplaceable in legacy avionics and industrial control upgrades where power architecture and footprint constraints are fixed.

Availability

7005L17J is available at Aetrix Electronics and suitable for real-time inter-processor communication, video frame buffering, and military avionics data exchange requiring stable component supply across extended product lifecycles.

Supply support for 7005L17J 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 in 2019.

The IDT7005 family was designed specifically for deterministic, low-latency shared-memory architectures in dual-processor systems - emphasizing hardware arbitration, semaphore support, and robust operation across military and industrial environments.

FAQ

What is the guaranteed maximum read cycle time (tRC) for the 7005L17J?

The 7005L17J has a guaranteed maximum read cycle time (tRC) of 17 ns across the full industrial temperature range (−40°C to +85°C) and 5.0 V ±10% supply. This parameter is production-tested and ensures deterministic timing for synchronous bus interfacing in real-time systems. The 7005L17J achieves this while maintaining 1 mA typical standby current - a key differentiator from faster but higher-power alternatives.

Does the 7005L17J support battery backup operation, and what voltage is required?

Yes, the 7005L17J supports battery backup operation with guaranteed data retention down to 2.0 V (VDR), as specified in Table 9 of the datasheet. When VCC drops below operational threshold, the device enters data retention mode with ICCDR ≤ 4000 µA (military/industrial grade). This feature is exclusive to the "L" (low-power) variant and is validated across temperature - critical for avionics black-box recorders and industrial UPS systems.

How does the M/S pin affect BUSY signal behavior on the 7005L17J?

When M/S = HIGH, the 7005L17J operates as a master: BUSYL and BUSYR are push-pull outputs that assert low during port contention to block writes. When M/S = LOW, it acts as a slave: BUSYL and BUSYR become inputs that must be driven low by an external master to inhibit local writes. This configuration enables scalable multi-device memory expansion without additional glue logic - a core design intent of the IDT7005 family.

Can the 7005L17J perform simultaneous reads from both ports to the same memory address?

Yes, the 7005L17J's true dual-port SRAM cells allow simultaneous reads from both left and right ports to the exact same memory address without conflict, delay, or arbitration overhead. This capability is intrinsic to the cell architecture - unlike pseudo-dual-port or single-port RAMs with multiplexed buses - and is explicitly confirmed in the "Features" section of the datasheet. No BUSY assertion or timing penalty occurs during such operations.

What are the valid package options for the 7005L17J, and which one is documented for this speed grade?

The 7005L17J is documented exclusively in the 64-pin thin quad flatpack (TQFP, package code PNG64), with dimensions 14 mm × 14 mm × 1.4 mm. While the broader IDT7005 family offers 68-pin PGA and PLCC variants, the 17 ns speed grade (denoted by "17" in the part number) is only qualified and characterized in the TQFP package - as confirmed by ordering information and thermal derating tables in the datasheet.