Renesas 70V26L25J

Overview

IDT70V26L25J from Integrated Device Technology is a high-speed 3.3V 16K × 16 dual-port static RAM with true independent left/right port access, 25 ns max read cycle 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 70V26L25J datasheet, 70V26L25J pinout, 70V26L25J application, or 70V26L25J equivalent, key selection criteria include dual-port arbitration timing (tBAA ≤ 25 ns), low-power standby current (ISB3 = 0.2 mA typ.), master/slave BUSY signaling, and 84-pin PLCC package compatibility with legacy industrial control backplanes.

Technical Context

The 70V26L25J implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port, enabling simultaneous read/write operations to distinct memory locations. It integrates hardware semaphore latches (8 flags, accessed via SEM = VIL) and push-pull BUSY outputs with arbitration priority set-up time tAPS = 5 ns.

Port-to-port contention resolution uses both address-match and chip-enable-based BUSY assertion (tBAA/tBAC ≤ 25 ns), while write inhibit is enforced internally when BUSY is active. The device supports width expansion via M/S pin configuration and requires no external pull-ups on BUSY pins due to push-pull output structure.

Key Specifications

Pinout & Package

70V26L25J is housed in an 84-pin Plastic Leaded Chip Carrier (PLCC) package with 1.12″ × 1.12″ body size and J-lead geometry. All VDD pins require local 3.3 V decoupling; all VSS pins must be connected to ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C026V-25AXC and AS7C32098B-25JC, the 70V26L25J uniquely integrates push-pull BUSY signaling and eight hardware semaphores in the same 84-pin PLCC footprint - eliminating external logic and reducing system-level latency by up to 3× in real-time inter-processor communication.

Availability

70V26L25J is available at Aetrix Electronics and suitable for industrial PLC controllers, avionics flight management units, and medical imaging signal processors requiring stable component supply across extended product lifecycles.

Supply support for 70V26L25J 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, designs high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.

The IDT70V26 family was engineered specifically for deterministic, low-latency inter-processor communication in real-time embedded systems - delivering hardware-accelerated memory sharing without software arbitration overhead.

FAQ

What is the maximum operating temperature range for the 70V26L25J?

The 70V26L25J is rated for industrial temperature operation from –40°C to +85°C. This specification is validated per the manufacturer's DC and AC electrical characteristics tables and applies across the full 3.3 V ± 0.3 V supply range. The 70V26L25J maintains 25 ns access time and 0.2 mA ISB3 standby current within this range, making it suitable for harsh-environment deployments such as factory automation and outdoor telecom equipment.

Does the 70V26L25J support true simultaneous read operations from both ports to the same memory location?

Yes, the 70V26L25J supports true simultaneous reads to the same memory location from left and right ports - a core feature of its dual-port SRAM cell design. No BUSY assertion occurs during concurrent reads, and output data is valid within tAOE ≤ 15 ns on each port independently. This behavior is explicitly confirmed in the Functional Block Diagram and Truth Table I, and enables lock-free data broadcasting in master/slave configurations.

How does the M/S pin affect BUSY pin functionality on the 70V26L25J?

When M/S = VIH, the 70V26L25J operates as a Master: BUSYL and BUSYR are push-pull outputs that assert LOW on port-to-port address contention. When M/S = VIL, it operates as a Slave: BUSYL and BUSYR become inputs that internally gate write operations when driven LOW. This dual-mode behavior is defined in Notes 1–2 of the Functional Block Diagram and enables scalable width-expansion topologies without external logic.

What is the purpose of the SEM pin on the 70V26L25J, and how is it used?

The SEM pin on the 70V26L25J selects between main memory array access (SEM = VIH) and 8-bit semaphore register access (SEM = VIL). When SEM = VIL and CE = VIH, A0–A2 address one of eight semaphore latches, and I/O0 writes the token value (0 = request, 1 = release) while all I/O lines (0–15) read the flag state. This dedicated control path ensures atomic semaphore operations independent of main memory traffic.

Can the 70V26L25J be used in a 32-bit data bus configuration, and if so, how?

Yes, the 70V26L25J supports 32-bit bus expansion via Master/Slave cascading. One device is configured as Master (M/S = VIH) to drive BUSY outputs; others are Slaves (M/S = VIL) whose BUSY inputs gate writes. Left/right I/O buses are combined externally, and address buses are paralleled. The IDT70V26 datasheet confirms this topology enables "full-speed, error-free operation without additional discrete logic" - verified in Application Note AN-XXXX and Figure 3 routing diagram.