Renesas 7005S35JI

Overview

7005S35JI from IDT is a high-speed 8K × 8 true dual-port static RAM with independent left/right ports, 35 ns maximum read cycle time (tRC), TTL-compatible 5V ±10% supply, and integrated hardware semaphore/arbitration logic - used in real-time inter-processor communication systems requiring simultaneous access to shared memory without external logic.

For engineers reviewing the 7005S35JI datasheet, 7005S35JI pinout, 7005S35JI application, or 7005S35JI equivalent, this page delivers verified timing specs (tAA ≤35 ns, tACE ≤35 ns), dual-port arbitration behavior (M/S-selectable master/slave mode), BUSY/INT flag timing, and industrial-grade (-40°C to +85°C) operation for embedded control and military avionics designs.

Technical Context

The 7005S35JI 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 concurrent read/write operations to the same memory location. Its on-chip arbitration logic resolves port contention via BUSY flag assertion and supports semaphore signaling through dedicated SEML/SEMR pins and I/O0–I/O7-based flag registers.

It operates in two functional modes: as a standalone 64K-bit dual-port RAM or cascaded in MASTER/SLAVE configuration using M/S pin to expand data width beyond 8 bits. In master mode (M/S = H), BUSYL/BUSYR are outputs indicating port busy state; in slave mode (M/S = L), BUSYL/BUSYR become inputs that inhibit writes when asserted low.

Key Specifications

Pinout & Package

Ceramic 68-pin PLCC (PLG68) package, body size ≈1.18 in × 1.18 in × 0.16 in, with 4 ground pins (pins 2, 14, 34, 47), 3 VCC pins (pins 11, 23, 40), and dual-port signal separation across left/right sides.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C024AV-35AXC and IDT70V25L25PF, the 7005S35JI uniquely supports 5 V TTL systems with industrial temperature range and battery backup - making it irreplaceable in legacy avionics, industrial controllers, and mixed-voltage designs where pin-for-pin replacement is not feasible but functional equivalence in dual-port arbitration is critical.

Availability

7005S35JI is available at Aetrix Electronics and suitable for real-time inter-processor communication, digital signal processing buffering, and industrial PLC memory expansion requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 7005S35JI 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, 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 automation - emphasizing hardware arbitration, semaphore support, and robust 5 V operation.

FAQ

What is the maximum operating temperature range for the 7005S35JI?

The 7005S35JI is rated for industrial temperature operation from -40°C to +85°C, as confirmed in the "Maximum Operating Temperature and Supply Voltage" table (Table 205). This range applies to all speed grades including the 35 ns variant, and is validated across AC/DC electrical specifications in the datasheet.

Does the 7005S35JI support battery backup operation, and what is the minimum retention voltage?

Yes, the 7005S35JI supports battery backup operation with a minimum data retention voltage (VDR) of 2.0 V, as specified in Table 209. This allows the device to maintain stored data during main power loss - a key feature of the "L" (low-power) version embodied in the 7005S35JI's design.

How does the M/S pin affect BUSY signal behavior in the 7005S35JI?

When M/S = H (master), BUSYL and BUSYR are push-pull outputs that assert low to indicate port contention. When M/S = L (slave), BUSYL and BUSYR become inputs that must be held high to enable writes; if driven low by a master, the slave port's write is internally inhibited - per Pin Names table and Truth Table IV notes.

Can the 7005S35JI perform simultaneous reads from both ports to the same memory address?

Yes, the 7005S35JI features true dual-ported memory cells that allow simultaneous reads from both left and right ports to the same address location without contention, arbitration, or timing penalty - explicitly stated in the "Features" section and verified in Truth Table I (non-contention read mode).

What are the key timing parameters that define the 35 ns speed grade of the 7005S35JI?

The 35 ns speed grade is defined by maximum values of tRC (read cycle time), tAA (address access time), and tACE (chip enable access time), all guaranteed ≤35 ns across the industrial temperature range - as tabulated in Tables 213a and 213b. These govern minimum clock-to-data and setup/hold timing in synchronous interfaces.