Renesas 7005L20J

Overview

7005L20J from IDT is a high-speed 8K × 8 dual-port static RAM with true independent left/right ports, 20 ns maximum access time (industrial grade), 1 mW typical standby power, and full on-chip semaphore/interrupt/arbitration logic - used in real-time inter-processor communication, military avionics data buffers, and redundant control systems requiring simultaneous asynchronous access.

For engineers reviewing the 7005L20J datasheet, 7005L20J pinout, 7005L20J application, or 7005L20J equivalent, this page delivers verified timing specs (tRC = 20 ns), dual-port arbitration behavior (M/S-selectable master/slave mode), battery backup capability (2 V data retention), TTL-compatible 5 V ±10% operation, and confirmed 64-pin TQFP package mapping.

Technical Context

The 7005L20J implements fully asynchronous dual-port architecture with separate address, control, and I/O buses for left (L) and right (R) ports, enabling concurrent read/write operations to the same memory location without contention. Its on-chip arbitration logic resolves port conflicts via BUSY flag assertion and supports both CE-controlled and address-match BUSY activation modes.

It integrates dedicated semaphore registers (8 flags, addressed by A0–A2), interrupt flag generation (INTL/INTR set/clear at fixed addresses 1FFEh/1FFFh), and Master/Slave configuration via M/S pin - allowing cascaded 16-bit+ word systems without external logic. The device operates across −40°C to +85°C and retains data at 2 V supply.

Key Specifications

Pinout & Package

7005L20J is packaged in a 64-pin thin quad flatpack (TQFP), body size 14 mm × 14 mm × 1.4 mm, with 0.5 mm pitch and exposed thermal pad (not electrically connected). Pin 1 marked by dot; top view shown in datasheet drawing 2738 drw 03.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-20AXC and IDT70V25L20PF, the 7005L20J uniquely supports direct 5 V TTL interfacing, M/S-configurable cascading, and 2 V battery backup - making it irreplaceable in legacy industrial/military systems requiring drop-in compatibility and robust power-fail resilience.

Availability

7005L20J is available at Aetrix Electronics and suitable for avionics flight control buffers, military radar signal processing, and industrial PLC redundancy modules requiring stable component supply across extended product lifecycles.

Supply support for 7005L20J 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 high-reliability dual-ported memory applications in aerospace, defense, and industrial control - emphasizing deterministic arbitration, low-power standby, and seamless master/slave scalability.

FAQ

What is the guaranteed maximum access time for the 7005L20J across its rated temperature range?

The 7005L20J guarantees 20 ns maximum access time (tAA) over the full industrial temperature range of −40°C to +85°C, as specified in Table 13a of the official IDT datasheet (document 2738, Rev Feb.14.20). This applies to both left and right ports under VCC = 5.0 V ±10% and load conditions per Figure 1. The 7005L20J is not rated for commercial or military temperature grades - only industrial.

Does the 7005L20J support true simultaneous read operations from both ports to the same memory address?

Yes, the 7005L20J uses true dual-port SRAM cells that allow concurrent reads from both left and right ports to identical addresses without conflict or performance penalty. This is explicitly stated in the "Features" section: "True Dual-Ported memory cells which allow simultaneous reads of the same memory location." No BUSY assertion or arbitration delay occurs during such operations.

How does the M/S pin affect BUSY pin functionality on the 7005L20J?

When M/S = H (high), the 7005L20J operates as a master: BUSYL and BUSYR become push-pull outputs that assert low to indicate port contention. When M/S = L (low), it operates as a slave: BUSYL and BUSYR become inputs that must be driven low by an external master to inhibit writes - as noted in datasheet Note 1: "(MASTER): BUSY is output; (SLAVE): BUSY is input."

Can the 7005L20J retain data when powered solely by a 2 V backup battery?

Yes, the 7005L20J supports guaranteed data retention at VCC = 2.0 V minimum, as confirmed in Table 9 ("Data Retention Characteristics") and Figure 5 ("Data Retention Waveform"). This applies across all temperature ranges and is a defining feature of the "L" (low-power) variant - enabling reliable operation during main power loss in safety-critical systems.

What are the valid address ranges for setting and clearing interrupt flags on the 7005L20J?

The 7005L20J uses fixed addresses to control interrupts: writing any value to left port address 1FFEh sets the INTL flag; writing to 1FFFh clears it. Similarly, right port address 1FFFh sets INTR, and 1FFEh clears it - as defined in Truth Table III (datasheet Table 17). These addresses are hardwired and not configurable.