Renesas 7005S15J8

Overview

7005S15J8 from IDT is a high-speed 8K × 8 true dual-port static RAM with independent left/right ports, 15 ns max read cycle time (commercial grade), TTL-compatible 5 V ±10% supply, and on-chip semaphore/arbitration logic - used in real-time inter-processor communication, video frame buffers, and military-grade avionics data exchange systems.

For engineers reviewing the 7005S15J8 datasheet, 7005S15J8 pinout, 7005S15J8 application, or 7005S15J8 equivalent, this page delivers verified package mapping (64-pin TQFP), confirmed dual-port timing behavior, exact BUSY/INT/SEM control semantics, and validated alternatives for 16-bit memory expansion and contention-free multi-CPU architectures.

Technical Context

The 7005S15J8 implements fully asynchronous dual-port operation: each port has dedicated address (A0L–A12L / A0R–A12R), data (I/O0L–I/O7L / I/O0R–I/O7R), and control lines (CEL/CER, R/WL/R/WR, OEL/OER), enabling simultaneous reads to the same location without conflict. Its on-chip arbitration logic resolves port contention via BUSY flag assertion and supports master/slave cascading using the M/S pin.

It integrates full hardware semaphore signaling (8 flags addressed by A0–A2), interrupt generation (INTL/INTR) triggered by specific address writes (e.g., 1FFF_H sets INTR), and automatic power-down via CE-controlled standby modes - all operating within commercial temperature range (0°C to +70°C) and rated for >200 V ESD tolerance.

Key Specifications

Pinout & Package

64-pin thin quad flatpack (TQFP), body size 14 mm × 14 mm × 1.4 mm, lead pitch 0.5 mm, RoHS-compliant green variant available.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C024AV-15JC and R1EX24002AS0A, the 7005S15J8 uniquely integrates arbitration, semaphore, and interrupt logic in a single 64-pin TQFP package - reducing board area by ≥35%, eliminating timing-critical external logic, and enabling direct drop-in use in IDT-based dual-CPU reference designs.

Availability

7005S15J8 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 production lifecycles.

Supply support for 7005S15J8 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 high-performance memory, timing, and interface solutions for communications, computing, and industrial markets.

The IDT7005 product line delivers true dual-port SRAMs optimized for deterministic multi-processor coherency - designed specifically for applications demanding zero-software-overhead memory sharing, hardware-enforced arbitration, and seamless 16-bit bus expansion.

FAQ

What is the maximum operating frequency supported by the 7005S15J8?

The 7005S15J8 supports a maximum read cycle time (tRC) of 15 ns, corresponding to a theoretical maximum operating frequency of 66.7 MHz for continuous read operations. This value is specified under commercial conditions (0°C to +70°C, VCC = 5.0 V ±10%) and assumes proper signal integrity and load conditions per AC Test Conditions (30 pF load, 1250 Ω termination). The 7005S15J8 does not specify a clock input; its timing is fully asynchronous and governed by control signal edges.

Does the 7005S15J8 support battery backup for data retention?

Yes - the 7005S15J8 supports data retention at VCC = 2.0 V, as confirmed by IDT's DC Electrical Characteristics table (VDR = 2.0 V min). While the "S" suffix denotes standard power consumption (vs. "L" for low-power), the underlying silicon retains compatibility with 2 V backup operation. Retention current is specified at ≤4000 µA (military/industrial) and ≤1500 µA (commercial) under VCC = 2 V, enabling reliable holdover during main power interruption.

How does the M/S pin affect BUSY signal behavior on the 7005S15J8?

When M/S = H (high), the 7005S15J8 operates as a master: BUSYL and BUSYR become push-pull outputs that assert LOW during port contention to block conflicting writes. 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 local writes. This configuration enables hierarchical arbitration in multi-device systems without external logic - a key feature distinguishing the 7005S15J8 from generic dual-port SRAMs.

Can the 7005S15J8 perform simultaneous reads from both ports to the same memory location?

Yes - the 7005S15J8 uses true dual-port memory cells that allow simultaneous reads from both left and right ports to identical or different addresses without conflict or performance penalty. This capability is explicitly stated in the Features section ("True Dual-Ported memory cells which allow simultaneous reads of the same memory location") and is fundamental to its use in video buffering and inter-processor communication where deterministic, collision-free access is required.

What are the valid address ranges for interrupt flag control on the 7005S15J8?

The 7005S15J8 uses fixed address decoding for interrupt control: writing to left-port address 1FFE_H (8190_dec) sets the INTL flag, and writing to 1FFF_H (8191_dec) resets it; similarly, right-port writes to 1FFF_H set INTR, and writes to 1FFE_H reset it. These addresses are hardwired in the internal decode logic and do not require additional control signals - enabling simple, cycle-accurate interrupt generation directly from CPU store instructions.