Renesas 7026S25J8

Overview

IDT7026S25J8 from IDT (Integrated Device Technology) is a high-speed 16K × 16 true dual-port static RAM with independent left/right ports, 25 ns maximum access time (commercial grade), TTL-compatible 5 V ±10% supply, and on-chip semaphore arbitration logic. It enables simultaneous asynchronous read/write to the same memory location and supports master/slave cascading for 32-bit+ bus expansion in real-time inter-processor communication systems.

For engineers reviewing the IDT7026S25J8 datasheet, IDT7026S25J8 pinout, IDT7026S25J8 application, or IDT7026S25J8 equivalent, key selection considerations include BUSY flag timing (tBAA ≤ 20 ns), dual-port contention resolution via M/S pin configuration, separate upper/lower byte enables (UBL/LBL, UBR/LBR), and industrial-grade thermal range support (-40°C to +85°C) confirmed for this speed grade.

Technical Context

The IDT7026S25J8 implements fully asynchronous dual-port architecture with independent address/control/I/O buses per port, enabling concurrent access without external synchronization. Its on-chip arbitration logic uses chip enable (CEL/CER) and address match detection-not R/W state-to assert BUSY flags, ensuring deterministic priority resolution during contention.

It integrates eight hardware semaphores accessible via A0–A2 addressing and I/O0 write/data lines, with dedicated SEM pins (SEML/SEMR) and push-pull BUSY outputs (BUSYL/BUSYR) that function as outputs in master mode (M/S = H) and inputs in slave mode (M/S = L). Power management is controlled per-port via CE, supporting multiple standby current modes (ISB1–ISB4).

Key Specifications

Pinout & Package

Package: 84-pin PLCC (Plastic Leaded Chip Carrier), body size ≈ 1.15 in × 1.15 in × 0.17 in; 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 CY7C028V-25AXC and R1EX24016AS0C-25, the IDT7026S25J8 uniquely delivers integrated semaphore registers and configurable master/slave arbitration in a drop-in 84-pin PLCC footprint - critical for deterministic real-time systems where software overhead must be minimized.

Availability

IDT7026S25J8 is available at Aetrix Electronics and suitable for real-time inter-processor communication, industrial PLC memory expansion, and avionics data acquisition requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for IDT7026S25J8 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, RF, and sensor signal processing solutions, now part of Renesas Electronics since 2019.

The IDT7026S25J8 belongs to IDT's high-speed dual-port SRAM product line, designed specifically for deterministic, low-latency shared-memory architectures in embedded control, test equipment, and communications infrastructure.

FAQ

What is the maximum operating temperature range certified for the IDT7026S25J8?

The IDT7026S25J8 is specified for industrial temperature operation from -40°C to +85°C, as confirmed in the Absolute Maximum Ratings and Recommended Operating Conditions tables of the official datasheet (DSC 2939/17, August 2019). This rating applies to the 'S' speed grade at 25 ns access time and is validated across electrical parameters including tAA, tRC, and ISB1.

Does the IDT7026S25J8 support true simultaneous read/write to the same memory address?

Yes, the IDT7026S25J8 implements true dual-ported memory cells that permit simultaneous access - including concurrent read and write - to the identical memory location. When contention occurs, on-chip arbitration asserts BUSYL or BUSYR to stall one port, while the other proceeds. This behavior is explicitly documented in the Functional Block Diagram and Truth Table I.

How does the M/S pin affect BUSY pin functionality on the IDT7026S25J8?

When M/S = H (high), the IDT7026S25J8 operates as a master: BUSYL and BUSYR are push-pull outputs indicating contention. When M/S = L (low), it operates as a slave: BUSYL and BUSYR become inputs that internally inhibit writes upon assertion. This dual-mode behavior is defined in Pin Names table (2939 tbl 01) and Functional Description section.

Can the IDT7026S25J8 be used in a 32-bit data bus configuration?

Yes, the IDT7026S25J8 supports 32-bit expansion using master/slave cascading. One device is configured as master (M/S = H), another as slave (M/S = L); their BUSY signals coordinate arbitration across the combined array. The datasheet confirms this capability in the Description section and Figure 2939 drw 01 block diagram.

What are the standby current specifications for the IDT7026S25J8 under full CMOS input conditions?

Under full CMOS standby (ISB3 condition: all inputs > VCC − 0.2 V or < 0.2 V, f = 0), the IDT7026S25J8 draws ≤ 5 mA typical and ≤ 15 mA maximum - verified in DC Electrical Characteristics Table 2939 tbl 10 for the 'S' version at 25 ns speed. This mode achieves lowest power while retaining fast wake-up capability.