Renesas 70V26L25JI

Overview

70V26L25JI from Integrated Device Technology is a high-speed, low-power 16K × 16 (256 Kbit) true dual-port static RAM with independent left/right ports, 25 ns max access time, 3.3 V ±0.3 V single supply, and integrated hardware semaphore logic for inter-processor resource arbitration in real-time embedded systems.

For engineers reviewing the 70V26L25JI datasheet, 70V26L25JI pinout, 70V26L25JI application, or 70V26L25JI equivalent, this device supports simultaneous asynchronous reads/writes across ports, on-chip BUSY arbitration, byte-selectable I/O control, master/slave cascading for 32-bit+ data buses, and ultra-low 660 µW standby power - critical for deterministic multi-core communication and shared-memory co-processing.

Technical Context

The 70V26L25JI 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 flags (BUSYL/BUSYR), triggered by address match or chip-enable timing, with configurable master/slave mode via the M/S pin.

It integrates eight independent active-low semaphore latches accessible via dedicated SEM control (CE = VIH, SEM = VIL), using A0–A2 to select flag, and supports token-passing protocols without software wait states. Power management is controlled independently per port via CEL/CER and SEM pins, enabling selective port shutdown.

Key Specifications

Pinout & Package

70V26L25JI is housed in an 84-pin PLCC package (body size ≈ 1.12 in × 1.12 in × 0.16 in), with 42 pins per side, requiring all VDD pins to be connected to 3.3 V and all VSS pins to ground.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C136-25JC and IDT70V36S25PF, the 70V26L25JI uniquely delivers hardware semaphore support and master/slave BUSY arbitration in an 84-pin PLCC package at 25 ns speed - making it optimal for space-constrained, real-time deterministic systems where inter-processor coordination latency must be eliminated at silicon level.

Availability

70V26L25JI is available at Aetrix Electronics and suitable for industrial PLC controllers, avionics flight management units, and medical imaging data pipelines requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for 70V26L25JI 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 solutions for high-performance computing and communications infrastructure.

The 70V26L25JI belongs to IDT's legacy high-speed dual-port SRAM product line, designed specifically for deterministic multi-processor systems requiring hardware-coordinated shared memory with minimal latency and ultra-low standby power.

FAQ

What is the operating temperature range for the 70V26L25JI?

The 70V26L25JI is rated for industrial temperature operation from –40°C to +85°C. This specification is validated across all electrical parameters including access time, standby current, and BUSY arbitration timing, ensuring reliable performance in demanding embedded environments such as factory automation and transportation systems.

Does the 70V26L25JI support true simultaneous read operations on both ports to the same memory location?

Yes, the 70V26L25JI supports true simultaneous reads to the same memory address from both left and right ports without contention or timing penalty. This capability is inherent to its true dual-port SRAM cell architecture and is explicitly confirmed in the functional description and truth tables of the official datasheet.

How does the M/S pin affect BUSY pin behavior on the 70V26L25JI?

When M/S = VIH, the 70V26L25JI operates as a master: BUSYL and BUSYR are push-pull outputs that assert LOW to indicate port contention. When M/S = VIL, it operates as a slave: BUSYL and BUSYR become inputs that internally inhibit writes when driven LOW - enabling hierarchical arbitration in multi-device arrays.

What is the standby power consumption of the 70V26L25JI in full standby mode?

In full standby mode (ISB3 condition), where both ports are deselected with CMOS-level inputs and SEM enabled, the 70V26L25JI consumes 660 µW typical power at 3.3 V. This value is measured with both CEL and CER > VDD – 0.2 V and VIN held at rail extremes, as specified in Table 9 of the datasheet.

Can the 70V26L25JI be used to expand a 32-bit data bus, and how is that implemented?

Yes, the 70V26L25JI supports 32-bit bus expansion using its Master/Slave select feature. One device is configured as master (M/S = VIH) and others as slaves (M/S = VIL); the master's BUSY output coordinates arbitration across the array, while data lines are combined externally - enabling error-free, full-speed wide-bus operation without discrete glue logic.