Renesas 7026L55J

Overview

7026L55J from IDT (Integrated Device Technology) is a high-speed 16K × 16 true dual-port static RAM with independent left/right ports, 55 ns read cycle time, 5V ±10% single supply, and industrial temperature range (–40°C to +85°C). It supports simultaneous asynchronous access to the same memory location and integrates on-chip semaphore logic for inter-port coordination in real-time embedded systems.

For engineers reviewing the 7026L55J datasheet, 7026L55J pinout, 7026L55J application, or 7026L55J equivalent, key selection criteria include BUSY arbitration timing (tBDD ≤ 40 ns), low standby current (ISB3 = 0.2 mA typ.), dual-byte control (UBL/LBL), and Master/Slave cascading capability for 32-bit+ memory expansion.

Technical Context

The 7026L55J implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port. Its on-chip arbitration logic resolves contention via BUSY flag assertion based on chip enable and address match timing - not R/W state - enabling deterministic priority resolution without external logic.

It features dedicated semaphore registers (8 flags, addressed by A0–A2) accessible via CE = VIH / SEM = VIL, and supports full power-down modes: ISB1 = 60 mA max (both ports TTL-input standby), ISB3 = 5 µA max (both ports CMOS-input full standby), with automatic CE-controlled port gating.

Key Specifications

Pinout & Package

7026L55J is packaged in an 84-pin PLCC (Plastic Leaded Chip Carrier) with 1.15 in × 1.15 in body size. All VCC pins require connection to +5V; all GND pins must be tied to system ground.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-55AC and IDT70V26S15PF, the 7026L55J uniquely delivers 5V-compatible dual-port operation with integrated BUSY arbitration and semaphore registers - eliminating external logic while maintaining industrial temperature compliance and proven field reliability in deterministic control systems.

Availability

7026L55J is available at Aetrix Electronics and suitable for real-time motion control, digital signal processing buffers, industrial PLC I/O mapping, and avionics data concentrators requiring stable component supply across extended product lifecycles.

Supply support for 7026L55J 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 timing, memory, and interface solutions, now part of Renesas Electronics.

The IDT7026 family was designed specifically for deterministic, low-latency inter-processor communication in industrial automation, military computing, and telecom infrastructure - emphasizing hardware arbitration, dual-voltage compatibility, and long-term obsolescence resilience.

FAQ

What is the maximum operating temperature range for the 7026L55J?

The 7026L55J is rated for industrial temperature operation from –40°C to +85°C. This specification is validated per the manufacturer's qualification testing and applies across all guaranteed AC/DC parameters including tRC = 55 ns, ISB3 ≤ 5 µA, and BUSY timing (tBDD ≤ 40 ns). The device uses ceramic-enhanced plastic packaging to maintain parameter stability across this full range.

Does the 7026L55J support true simultaneous read/write to the same memory address?

Yes, the 7026L55J implements true dual-port SRAM cells that permit simultaneous access to the same address location. When contention occurs, on-chip BUSY logic asserts BUSYL or BUSYR to stall the later-accessing port. The winning port proceeds without delay; the stalled port waits until BUSY deasserts - ensuring data coherency without external arbitration logic.

How does the Master/Slave (M/S) pin affect BUSY pin functionality in the 7026L55J?

When M/S = HIGH, the 7026L55J operates as a master: BUSYL and BUSYR are push-pull outputs indicating address contention. When M/S = LOW, it operates as a slave: BUSYL and BUSYR become inputs that internally inhibit writes when driven LOW. In slave mode, the device relies on external master arbitration and requires no pull-up resistors on BUSY lines.

What is the purpose of the semaphore registers in the 7026L55J, and how are they accessed?

The 7026L55J includes eight hardware semaphore flags used for inter-processor synchronization. They are accessed by setting CE = VIH and SEM = VIL (opposite of RAM access), then addressing A0–A2. Semaphore reads return the flag state across all 16 I/O pins; writes use I/O0 only. tSWRD = 5 ns guarantees fast flag update-to-read turnaround.

Can the 7026L55J be used in a 32-bit memory system, and what is required to implement it?

Yes, the 7026L55J supports 32-bit expansion via Master/Slave cascading. Two devices are configured with one as master (M/S = HIGH) and one as slave (M/S = LOW). The master's BUSY outputs connect to the slave's BUSY inputs, and address/data buses are aligned. This configuration maintains full-speed operation without added glue logic - a key design advantage over single-port alternatives.