Renesas 70V26L25JI8

Overview

70V26L25JI8 from Integrated Device Technology is a high-speed 3.3V 16K × 16 dual-port static RAM with true asynchronous dual-port architecture, 25 ns maximum 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 70V26L25JI8 datasheet, 70V26L25JI8 pinout, 70V26L25JI8 application, or 70V26L25JI8 equivalent, key selection criteria include port-to-port arbitration timing (tBAA ≤ 25 ns), dual-byte enable control (UBL/LBL), master/slave BUSY signaling, and industrial temperature support (–40°C to +85°C).

Technical Context

The 70V26L25JI8 implements fully independent left/right ports with separate address, data, and control lines - enabling simultaneous read/write operations to any memory location. Its hardware-based arbitration uses push-pull BUSY outputs (BUSYL/BUSYR) and M/S-selectable master/slave mode to resolve contention without external logic.

It integrates eight dedicated semaphore latches accessible via SEM = VIL, A0–A2 addressing, and I/O0 write control - supporting token-passing protocols between processors. All timing is fully asynchronous per port, with no shared clock or synchronization requirement.

Key Specifications

Pinout & Package

70V26L25JI8 is housed in an 84-pin Plastic Leaded Chip Carrier (PLCC) package, body size ≈ 1.15 in × 1.15 in × 0.17 in, with lead pitch of 0.05 in. All VDD pins require local 3.3 V decoupling; all VSS pins must be connected 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 IDT70V36S25PF8, the 70V26L25JI8 uniquely balances industrial temperature support, ultra-low standby power (660 µW), and integrated semaphores in a compact 84-pin PLCC - making it optimal for cost-sensitive, power-constrained, and safety-aware dual-processor systems where board space and arbitration simplicity are critical.

Availability

70V26L25JI8 is available at Aetrix Electronics and suitable for industrial PLC controllers, telecom line cards, avionics flight computers, and medical imaging subsystems requiring stable component supply across extended product lifecycles.

Supply support for 70V26L25JI8 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 70V26L25JI8 belongs to IDT's high-speed dual-port SRAM product line, designed specifically for real-time multiprocessor systems requiring deterministic memory access, hardware resource arbitration, and low-power industrial operation.

FAQ

What is the operating temperature range for the 70V26L25JI8?

The 70V26L25JI8 is rated for industrial temperature operation from –40°C to +85°C. This specification is validated across all electrical parameters including access time (25 ns max), standby current (660 µW typ.), and BUSY arbitration timing (tBAA ≤ 25 ns). The device uses CMOS process technology optimized for thermal stability in embedded control environments.

How does the 70V26L25JI8 handle simultaneous access to the same memory location?

The 70V26L25JI8 resolves simultaneous access via hardware BUSY arbitration: when both ports address the same location, BUSYL or BUSYR asserts within 25 ns to stall the later-arriving write. The device uses address-match or CE-timing detection - no external logic is needed. In slave mode (M/S = VIL), BUSY becomes an input that directly inhibits writes.

Does the 70V26L25JI8 support byte-level write control?

Yes, the 70V26L25JI8 supports independent upper- and lower-byte write enable via UBL/LBL (left port) and UBR/LBR (right port). Asserting only UBL enables writing to I/O0L–I/O7L while preserving I/O8L–I/O15L - essential for interfacing with 8-bit peripherals or aligning data to legacy bus structures without external byte-mask logic.

What is the function of the SEM pin on the 70V26L25JI8?

The SEM pin on the 70V26L25JI8 selects between main memory array (SEM = VIH) and eight semaphore registers (SEM = VIL). When SEM = VIL, A0–A2 address one of eight latches, and I/O0 writes the token value (0 = request, 1 = release); all I/O lines reflect the latch state on read. This enables lock-free inter-processor synchronization without CPU polling overhead.

Can multiple 70V26L25JI8 devices be cascaded for wider data buses?

Yes, the 70V26L25JI8 supports width expansion using Master/Slave configuration: one device set to M/S = VIH acts as master (BUSY output), others as slaves (BUSY input). This enables seamless 32-bit or wider word systems with full-speed operation and automatic arbitration - no additional discrete logic or timing compensation is required.