Renesas 7026S20J

Overview

7026S20J from IDT (Integrated Device Technology) is a high-speed 16K × 16 true dual-port static RAM with independent left/right ports, 20 ns maximum access time (commercial grade), TTL-compatible 5V ±10% supply, and on-chip semaphore arbitration logic. It enables simultaneous asynchronous read/write to the same memory location in real-time embedded systems requiring inter-processor communication.

For engineers reviewing the 7026S20J datasheet, 7026S20J pinout, 7026S20J application, or 7026S20J equivalent, key selection criteria include BUSY flag timing (tBAA ≤ 20 ns), dual-port power-down control via CE, separate upper/lower byte enables (UBL/LBL, UBR/LBR), and Master/Slave cascading support for 32-bit+ bus expansion.

Technical Context

The 7026S20J implements fully asynchronous dual-port operation with independent address decoders, I/O controls, and arbitration logic per port. Its hardware semaphore system uses A0–A2 addressing to manage eight shared flags across both ports, with dedicated SEM pins and push-pull BUSY outputs in Master mode.

It supports two distinct operational modes: Master (M/S = H, BUSY as output) for automatic contention detection and arbitration, and Slave (M/S = L, BUSY as input) for write-inhibit control in cascaded configurations. Port-to-port delay (tWDD ≤ 45 ns, tDDD ≤ 30 ns) ensures deterministic timing during cross-port reads after writes.

Key Specifications

Pinout & Package

84-pin PLCC package (IDT part code PLG84), body size ≈ 1.15 in × 1.15 in × 0.17 in; all VCC pins require connection to 5V supply, all GND pins to ground.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C136-20JC and IDT7025S20J, the 7026S20J uniquely integrates Master/Slave cascading capability and full 16-bit dual-port width in a single 84-pin PLCC, reducing system-level arbitration complexity and PCB layer count in real-time inter-processor designs.

Availability

7026S20J 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 and long-term obsolescence management.

Supply support for 7026S20J 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 IDT7026 family was designed specifically for deterministic, low-latency inter-processor communication in mission-critical embedded systems - emphasizing hardware arbitration, semaphore coherency, and seamless bus-width scalability.

FAQ

What is the maximum operating temperature range for the 7026S20J?

The 7026S20J is rated for commercial temperature operation from 0°C to +70°C. It is not qualified for industrial (−40°C to +85°C) or military ranges - those grades use distinct part numbers (e.g., 7026S20JI for industrial). This specification is confirmed in the Absolute Maximum Ratings table and Operating Conditions section of the official IDT datasheet DSC 2939/17.

Does the 7026S20J support true simultaneous read/write to the same memory address?

Yes, the 7026S20J implements true dual-port SRAM cells that permit concurrent read and write operations to the identical memory location across left and right ports. This capability is explicitly stated in the Features section and enabled by on-chip arbitration logic - including BUSY flag generation and hardware semaphore support - ensuring data integrity without external intervention.

How does the M/S pin affect BUSY pin functionality on the 7026S20J?

When M/S = H (high), the 7026S20J operates in Master mode: BUSYL and BUSYR are push-pull outputs that assert automatically on address contention. When M/S = L (low), it operates as Slave: BUSYL and BUSYR become inputs that internally inhibit writes when driven low - enabling hierarchical arbitration in multi-device systems without external logic.

What package type is used for the 7026S20J, and are there alternatives?

The 7026S20J is supplied exclusively in an 84-pin PLCC (plastic leaded chip carrier) package, designated PLG84 in IDT documentation. While the IDT7026 family also offers an 84-pin PGA variant, the "J" suffix in 7026S20J specifically denotes the PLCC option - verified in the Pin Configurations section and ordering information of datasheet DSC 2939/17.

Can the 7026S20J be used in a 32-bit memory system? If so, how?

Yes, the 7026S20J supports 32-bit expansion via Master/Slave cascading. One device is configured as Master (M/S = H) to manage BUSY arbitration across multiple Slaves (M/S = L). The datasheet confirms this architecture enables "full-speed, error-free operation without additional discrete logic" - with each 7026S20J contributing 16 bits to the aggregate data bus width.