Renesas 70V26L35J8

Overview

70V26L35J8 from Integrated Device Technology is a high-speed 3.3V 16K × 16 true dual-port static RAM with independent left/right ports, 35 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 70V26L35J8 datasheet, 70V26L35J8 pinout, 70V26L35J8 application, or 70V26L35J8 equivalent, key selection criteria include dual-port arbitration timing (tBAA ≤ 35 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 70V26L35J8 implements fully asynchronous dual-port operation with separate address, control, and bidirectional I/O buses per port. Its hardware arbitration uses push-pull BUSY outputs (BUSYL/BUSYR) that assert when both ports access the same memory location, with tBDD ≤ 40 ns propagation delay to valid data.

On-chip semaphore logic provides eight independent latches accessible via SEM = VIL, A0–A2 addressing, and I/O0 write/read - enabling token-passing resource locking without CPU intervention. The device supports width expansion using M/S pin configuration and requires no external pull-ups due to active BUSY drivers.

Key Specifications

Pinout & Package

84-pin Plastic Leaded Chip Carrier (PLCC), ceramic body, 1.15 in × 1.15 in × 0.17 in. Pin 1 marked by notch; pin numbering counterclockwise from notch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C136-35JC and AS7C3256A-35JC, the 70V26L35J8 uniquely delivers 16K × 16 density at 3.3V with integrated semaphores and configurable BUSY arbitration - eliminating external logic and reducing BOM count in safety-critical multiprocessor systems.

Availability

70V26L35J8 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 70V26L35J8 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, specializes in high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.

The 70V26L35J8 belongs to IDT's high-speed dual-port SRAM family designed specifically for real-time multiprocessor systems requiring deterministic memory access, hardware resource locking, and ultra-low-power standby operation.

FAQ

What is the maximum operating temperature range for the 70V26L35J8?

The 70V26L35J8 is rated for commercial temperature operation from 0°C to +70°C. It does not support industrial-grade -40°C to +85°C operation - that specification applies only to the 'S' variant (e.g., 70V26S35J8). This makes the 70V26L35J8 ideal for controlled-environment applications like office-based telecom equipment or laboratory instrumentation where ambient thermal stress is minimal.

How does the M/S pin affect BUSY signal behavior on the 70V26L35J8?

When M/S = VIH, the 70V26L35J8 operates as a master: BUSYL and BUSYR are push-pull outputs that assert LOW during address contention. When M/S = VIL, it operates as a slave: BUSYL and BUSYR become inputs that internally inhibit writes when driven LOW. This configuration enables hierarchical arbitration in multi-device arrays without external logic - a core design feature of the 70V26L35J8.

Can the 70V26L35J8 perform simultaneous reads from both ports to the same memory location?

Yes - the 70V26L35J8 supports true dual-port operation, allowing simultaneous reads from both left and right ports to identical or different addresses without conflict or performance penalty. This capability is intrinsic to its memory cell architecture and requires no arbitration overhead, making the 70V26L35J8 especially valuable in real-time systems where deterministic latency is mandatory.

What is the purpose of the SEM pin on the 70V26L35J8?

The SEM pin on the 70V26L35J8 selects between RAM array access (SEM = VIH) and semaphore flag access (SEM = VIL). When low, A0–A2 address the eight semaphore latches, and I/O0 writes/reads token state - enabling hardware-assisted resource locking without CPU intervention. This dedicated control separates critical synchronization logic from main memory space, a defining feature of the 70V26L35J8.

Is the 70V26L35J8 pin-compatible with other members of the IDT70V26 family?

Yes - all IDT70V26 variants (e.g., 70V26S25J8, 70V26L55J8) share identical 84-pin PLCC pinouts and functional pin assignments. Differences are limited to speed grade (25/35/55 ns), power profile (S = standard, L = low-power), and temperature grade. This allows direct substitution within the same package footprint, provided timing and power requirements align - a key advantage of the 70V26L35J8 in design reuse scenarios.