Renesas 70V26L55J

Overview

70V26L55J from Integrated Device Technology is a high-speed 3.3V 16K × 16 true dual-port static RAM with independent left/right ports, 55 ns max access time, 660 µW standby power, and on-chip semaphore logic for inter-processor resource arbitration - used in real-time embedded multiprocessor systems requiring concurrent memory access without software overhead.

For engineers reviewing the 70V26L55J datasheet, 70V26L55J pinout, 70V26L55J application, or 70V26L55J equivalent, key selection criteria include dual-port arbitration timing (tBAA ≤ 45 ns), low-power standby mode (ISB3 = 0.2 mA typ.), byte-selectable I/O (UBL/LBL), and Master/Slave configuration via M/S pin for scalable 32-bit+ memory systems.

Technical Context

The 70V26L55J implements fully asynchronous dual-port operation with separate address, control, and bidirectional I/O buses per port. Its on-chip arbitration logic resolves contention via push-pull BUSY outputs (BUSYL/BUSYR) when both ports access the same address, with tBDD ≤ 50 ns disable-to-valid-data delay.

It integrates eight dedicated semaphore latches accessible via SEM = VIL, A0–A2 addressing, and I/O0 write control - enabling hardware token-passing without CPU intervention. Power management uses CE-driven automatic standby, achieving 660 µW ISB3 (full CMOS-level standby) at 3.3 V.

Key Specifications

Pinout & Package

70V26L55J is housed in an 84-pin PLCC (Plastic Leaded Chip Carrier) package, measuring approximately 1.15 in × 1.15 in × 0.17 in, with lead pitch of 0.05 in and body material compliant with RoHS and green-part requirements.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-55AXC and R1EX24064ASAS0I#U0, the 70V26L55J uniquely delivers 3.3 V dual-port operation with hardware semaphore and BUSY arbitration in a single chip - enabling deterministic, low-latency inter-processor communication without external logic or software overhead.

Availability

70V26L55J is available at Aetrix Electronics and suitable for industrial motion controllers, avionics data acquisition units, and medical imaging frame buffers requiring stable component supply across extended product lifecycles.

Supply support for 70V26L55J 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

Integrated Device Technology (IDT), now part of Renesas Electronics, is a fabless semiconductor company specializing in timing, memory interface, and RF power solutions for high-performance computing and communications infrastructure.

The 70V26L55J belongs to IDT's high-speed dual-port SRAM product line, designed specifically for deterministic, low-latency inter-processor communication in real-time embedded multiprocessor systems.

FAQ

What is the operating temperature range for the 70V26L55J?

The 70V26L55J is rated for commercial temperature range: 0°C to +70°C. It is not qualified for industrial (-40°C to +85°C) operation - that specification applies only to the 70V26S variant. The 'L' suffix denotes low-power optimization, not extended temperature grade.

Does the 70V26L55J support true simultaneous read operations on both ports to the same memory location?

Yes, the 70V26L55J supports true simultaneous reads from both ports to the same address without arbitration delay or data corruption. This is enabled by its true dual-port SRAM cell architecture - confirmed in the Functional Block Diagram and Truth Table I under "Non-Contention Read/Write Control".

How does the M/S pin affect BUSY signal behavior in the 70V26L55J?

When M/S = VIH, the 70V26L55J operates as Master: BUSYL and BUSYR are push-pull outputs asserting active-high BUSY during address contention. When M/S = VIL, it operates as Slave: BUSYL and BUSYR become inputs that internally inhibit writes when driven high - enabling cascaded arbitration without external logic.

Can the 70V26L55J be used in a 32-bit data bus configuration?

Yes, the 70V26L55J supports 32-bit expansion via Master/Slave cascading. One device is configured as Master (M/S = VIH) to drive BUSY arbitration, while others act as Slaves (M/S = VIL) accepting BUSY as write-inhibit - enabling full 32-bit word access without additional discrete logic, as documented in the Description section.

What is the minimum pulse width required for reliable semaphore flag writes in the 70V26L55J?

The minimum valid pulse width for semaphore writes is 15 ns, specified as tSOP (Semaphore Flag Update Pulse) in Table 11. This timing applies when accessing semaphores with CE = VIH and SEM = VIL - and must be met regardless of whether the operation occurs on the left or right port.