Renesas 7026L55J8

Overview

IDT7026L55J8 from IDT (Integrated Device Technology) is a high-speed 16K × 16 true dual-port static RAM with independent left/right ports, 55 ns maximum read cycle time, 5 V ±10% single-supply operation, and industrial temperature range (–40°C to +85°C). It enables simultaneous asynchronous access to the same memory location in real-time embedded systems requiring inter-processor communication or shared buffer management.

For engineers reviewing the IDT7026L55J8 datasheet, IDT7026L55J8 pinout, IDT7026L55J8 application, or IDT7026L55J8 equivalent, key selection considerations include BUSY arbitration timing (tBDD ≤ 40 ns), low standby current (ISB3 = 0.2 mA typ.), dual-byte control (UBL/LBL), semaphore flag support (8 flags via A0–A2), and compatibility with 84-pin PLCC packaging for legacy industrial designs.

Technical Context

The IDT7026L55J8 implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port-no clock required. Its on-chip arbitration logic uses chip enable (CEL/CER) and address match detection to assert BUSYL/BUSYR outputs in master mode, with tAPS = 5 ns priority setup time ensuring deterministic contention resolution.

It supports two distinct operational modes: as a standalone dual-port RAM or cascaded in MASTER/SLAVE configuration using the M/S pin to expand data width beyond 16 bits. Semaphore signaling is implemented via dedicated SEM pins and A0–A2 addressing, enabling hardware-level mutual exclusion across ports without external logic.

Key Specifications

Pinout & Package

Package: 84-pin Plastic Leaded Chip Carrier (PLCC), body size ≈ 1.15 in × 1.15 in × 0.17 in, lead finish SnPb, 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 IDT7026L55J8, the Cypress and ISSI alternatives offer higher integration density or lower voltage operation but omit on-chip BUSY arbitration and semaphore signaling-critical for deterministic real-time inter-processor communication in industrial and avionics systems.

Availability

IDT7026L55J8 is available at Aetrix Electronics and suitable for industrial PLCs, avionics data concentrators, dual-core DSP subsystems, and medical imaging frame buffers requiring stable component supply across extended product lifecycles.

Supply support for IDT7026L55J8 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 solutions, acquired by Renesas Electronics in 2019.

The IDT7026L55J8 belongs to IDT's legacy high-speed dual-port SRAM product line, designed specifically for deterministic inter-processor communication in industrial, military, and aerospace systems requiring hardware-enforced memory coherency.

FAQ

What is the maximum operating temperature range for the IDT7026L55J8?

The IDT7026L55J8 is rated for industrial temperature operation from –40°C to +85°C. This specification is explicitly confirmed in the "Maximum Operating Temperature and Supply Voltage" table (2939 tbl 02a) and applies to the 'L' speed grade with 55 ns timing. It does not support military or commercial-only temperature ranges.

Does the IDT7026L55J8 support true simultaneous read/write to the same memory address?

Yes, the IDT7026L55J8 implements true dual-port memory cells that allow simultaneous access-including concurrent read and write-to the exact same memory location. This is explicitly stated in the "Features" section and enabled by independent left/right port control logic, with BUSY arbitration resolving contention if both ports attempt writes.

How does the M/S pin affect BUSY pin functionality on the IDT7026L55J8?

When M/S = HIGH, the IDT7026L55J8 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 write-inhibit inputs, allowing external arbitration logic to gate writes-confirmed in Notes 1 and 2 of the Functional Block Diagram and Pin Configurations.

What is the standby current consumption of the IDT7026L55J8 under full disable conditions?

The IDT7026L55J8 draws 0.2 mA typical (5 µA max) standby current (ISB3) when both ports are fully disabled-i.e., CEL and CER held > VCC − 0.2 V, all inputs at CMOS logic levels, and SEMR/SEML > VCC − 0.2 V. This value is specified in Table 2939 tbl 10 for the 'L' version at 55 ns speed grade.

Can the IDT7026L55J8 be used in a 32-bit data bus configuration?

Yes, the IDT7026L55J8 supports 32-bit expansion via MASTER/SLAVE cascading using the M/S pin. Two devices can be configured-one master, one slave-with BUSY signals coordinated to maintain full-speed error-free operation without additional discrete logic, as described in the "Description" section and functional block diagram.