Renesas 7005L17J8

Overview

7005L17J8 from IDT is a high-speed 8K × 8 dual-port static RAM with true independent left/right port access, 17 ns maximum read cycle time (tRC), 2V data retention capability, and integrated hardware semaphore/arbitration logic - deployed in real-time inter-processor communication systems requiring concurrent memory access without external logic.

For engineers reviewing the 7005L17J8 datasheet, 7005L17J8 pinout, 7005L17J8 application, or 7005L17J8 equivalent, this device delivers deterministic port-to-port arbitration, battery-backed operation, and TTL-compatible 5V ±10% supply support - critical for embedded control, military avionics, and industrial motion controllers where simultaneous read/write coherency is mandatory.

Technical Context

The 7005L17J8 implements fully asynchronous dual-port architecture 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 simultaneous reads from identical memory locations. Its on-chip arbitration logic uses BUSY flag signaling and M/S pin configuration to enforce master/slave hierarchy during address contention.

It supports two distinct memory access modes: RAM mode (CE = LOW, SEM = HIGH) and semaphore mode (CE = HIGH, SEM = LOW), with dedicated 3-bit address decoding (A0–A2) for eight semaphore flags. The device guarantees tBDD ≤ 18 ns (BUSY disable to valid data) and tSWRD = 5 ns (semaphore write-to-read delay) at 17 ns speed grade.

Key Specifications

Pinout & Package

64-pin TQFP package (PNG64) with 0.5 mm pitch; body dimensions 14 mm × 14 mm × 1.4 mm; thermal pad exposed on underside for enhanced heat dissipation in high-density layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-17AXC and IS61LV5128-17KLI, the 7005L17J8 uniquely delivers 5V-compatible dual-port operation with integrated arbitration and 2V retention - making it irreplaceable in legacy industrial and military designs where voltage compatibility, deterministic latency, and fail-safe state preservation are non-negotiable.

Availability

7005L17J8 is available at Aetrix Electronics and suitable for industrial motion control, military avionics, and telecom infrastructure applications requiring stable component supply across extended product lifecycles.

Supply support for 7005L17J8 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, now part of Renesas Electronics since 2019.

The IDT7005 family was designed specifically for real-time embedded systems requiring deterministic inter-processor communication - delivering hardware-enforced memory coherency without software overhead or external glue logic.

FAQ

What is the guaranteed maximum access time for the 7005L17J8?

The 7005L17J8 guarantees a maximum read cycle time (tRC) of 17 ns across the full industrial temperature range (−40°C to +85°C). This value is production-tested and applies to both ports under worst-case voltage (4.5 V) and temperature conditions. The 7005L17J8 achieves this while maintaining 700 mW typical active power and 1 mW standby consumption - distinguishing it from faster but higher-power variants like the 7005S15.

Does the 7005L17J8 support battery backup operation?

Yes, the 7005L17J8 supports true battery backup operation with verified 2 V data retention capability. When VCC drops below 2.0 V, the device maintains stored data using an external 2 V backup source connected to VCC, with ICCDR ≤ 4000 µA (military/industrial grade). This feature is intrinsic to the "L" (low-power) variant and is explicitly characterized in datasheet Table 9 - unlike the "S" version which lacks retention specification.

How does the M/S pin affect BUSY signal behavior on the 7005L17J8?

On the 7005L17J8, the M/S pin configures BUSYL and BUSYR as outputs when M/S = HIGH (master mode), asserting active-low BUSY during port contention. When M/S = LOW (slave mode), BUSYL and BUSYR become inputs that must be driven externally to inhibit writes - per datasheet Note 1. This dual-role design enables flexible master/slave cascading without external logic, and is validated for all 7005L speed grades including the 7005L17J8.

Can the 7005L17J8 perform simultaneous read operations on both ports to the same memory address?

Yes, the 7005L17J8 supports true simultaneous reads from identical memory locations on both ports - a core feature of its "true dual-ported memory cells". This capability is electrically guaranteed and does not trigger BUSY arbitration, unlike simultaneous write/read or write/write operations. The functional block diagram (page 2) and Truth Table I confirm unrestricted concurrent reads with no timing penalty or conflict resolution overhead.

What package type is used for the 7005L17J8, and are thermal pads supported?

The 7005L17J8 is packaged in a 64-pin thin quad flatpack (TQFP), designated PNG64 per IDT documentation. Its mechanical dimensions are 14 mm × 14 mm × 1.4 mm with 0.5 mm lead pitch. The package includes an exposed thermal pad on the underside - confirmed in the "Pin Configurations" section (page 2, drawing 2738 drw 03) - enabling direct PCB copper pour connection for improved thermal performance in high-reliability applications.