Renesas 7026S25J

Overview

7026S25J 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 embedded control systems.

For engineers reviewing the 7026S25J datasheet, 7026S25J pinout, 7026S25J application, or 7026S25J equivalent, key selection considerations include BUSY arbitration timing (tBAA ≤ 20 ns), dual-byte enable (UBL/LBL), M/S-selectable master/slave mode, and industrial-grade availability via alternate speed grades.

Technical Context

The 7026S25J implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port - no shared timing constraints between left (L) and right (R) sides. Its on-chip arbitration logic uses chip enable (CEL/CER) and address match detection (A0–A13L vs A0–A13R) to assert BUSYL/BUSYR within 20 ns when contention occurs.

Semaphore functionality operates independently of main memory access: eight flags are addressed via A0–A2 and controlled by SEM/CE polarity inversion (CE = VIH & SEM = VIL), enabling inter-processor synchronization without software overhead. Power management includes four standby modes (ISB1–ISB4), with full CMOS-level standby drawing only 0.2 mA (typ.) for the S variant.

Key Specifications

Pinout & Package

7026S25J is housed in an 84-pin Plastic Leaded Chip Carrier (PLCC) package measuring approximately 1.15 in × 1.15 in × 0.17 in. All V_CC and GND pins require direct connection to power/ground planes; pin 1 is marked by a corner notch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C136-25JC and IDT70V26S25PF, the 7026S25J delivers native 5 V operation, push-pull BUSY signaling eliminating external resistors, and integrated M/S-selectable arbitration - making it optimal for cost-sensitive, drop-in upgrades of existing industrial controllers.

Availability

7026S25J is available at Aetrix Electronics and suitable for industrial motion control, DSP co-processing, redundant network switching, and avionics display systems requiring stable component supply and long-term obsolescence management.

Supply support for 7026S25J 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 conditioning ICs, now part of Renesas Electronics since 2019.

The IDT7026 family was designed specifically for real-time embedded systems requiring deterministic memory access between heterogeneous processors - emphasizing hardware arbitration, low-latency dual-porting, and robust 5 V interoperability.

FAQ

What is the maximum operating temperature range for the 7026S25J?

The 7026S25J is rated for commercial temperature operation from 0°C to +70°C. While the broader IDT7026 family includes industrial (–40°C to +85°C) and military variants, the 7026S25J suffix specifically denotes the commercial-grade version with 25 ns access time and PLCC packaging.

Does the 7026S25J support true simultaneous read/write to the same memory address?

Yes, the 7026S25J implements true dual-port static RAM cells that permit concurrent read and write operations to identical addresses. When contention occurs, its hardware BUSY logic asserts BUSYL or BUSYR within 20 ns to stall one port, ensuring data integrity without external arbitration circuitry.

How does the M/S pin affect BUSY pin functionality on the 7026S25J?

When M/S = HIGH, BUSYL and BUSYR operate as push-pull outputs indicating address contention. When M/S = LOW, both become inputs that internally gate write signals - enabling slave-mode operation where external master devices control arbitration, critical for cascaded 32-bit memory systems using multiple 7026S25J devices.

Can the 7026S25J be used in a 32-bit data bus configuration?

Yes, the 7026S25J supports 32-bit expansion via MASTER/SLAVE cascading. Two devices can be connected with M/S tied HIGH on one (master) and LOW on the other (slave), using BUSY outputs/inputs to coordinate access. The datasheet confirms full-speed error-free operation without additional discrete logic when expanding beyond 16 bits.

What are the power consumption characteristics of the 7026S25J in standby mode?

In full standby (ISB3), where all inputs are held at CMOS levels and clocks inactive, the 7026S25J draws just 0.2 mA typical. With TTL-level inputs active (ISB1), it consumes 25 mA typical - enabling energy-efficient operation in battery-backed or low-duty-cycle monitoring applications while retaining instant wake-up capability.