Renesas 7026L35J

Overview

IDT7026L35J from IDT (Integrated Device Technology) is a high-speed 16K × 16 true dual-port static RAM with independent left/right ports, 35 ns maximum access time, 1 mW typical standby power, and full on-chip semaphore arbitration logic - used in real-time interprocessor communication, video frame buffers, and military-grade embedded systems requiring concurrent read/write access to shared memory.

For engineers reviewing the IDT7026L35J datasheet, IDT7026L35J pinout, IDT7026L35J application, or IDT7026L35J equivalent, key selection considerations include its 84-pin PLCC package, master/slave cascading capability for 32-bit+ bus expansion, BUSY flag timing under M/S = VIH mode, and industrial temperature range (–40°C to +85°C) compliance.

Technical Context

The IDT7026L35J implements fully asynchronous dual-port operation with separate address, control, and I/O buses per port - enabling simultaneous, independent read/write access to any memory location without external arbitration logic. Its on-chip hardware semaphore logic supports eight dedicated flags accessed via A0–A2 and I/O0, with write-to-read latency of 5 ns.

Port arbitration uses push-pull BUSY outputs (BUSYL/BUSYR) when configured as master (M/S = H), or BUSY inputs when slave (M/S = L); contention resolution depends on chip enable and address match timing, not R/W state, and guarantees deterministic priority via tAPS (5 ns setup).

Key Specifications

Pinout & Package

Package: 84-pin PLCC (Plastic Leaded Chip Carrier), body size ≈ 1.15 in × 1.15 in × 0.17 in, lead pitch 0.05 in, ceramic base with plastic encapsulation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C136-35JC and IDT70V26S35PF, the IDT7026L35J uniquely delivers integrated semaphore logic and industrial temperature support in a mature 5V PLCC package - making it irreplaceable for legacy avionics and ruggedized control systems where hardware determinism and qualification continuity are mandatory.

Availability

IDT7026L35J is available at Aetrix Electronics and suitable for real-time interprocessor communication, video frame buffering, and military avionics data logging requiring stable component supply across extended product lifecycles.

Supply support for IDT7026L35J 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

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

The IDT7026L35J belongs to IDT's legacy dual-port SRAM product line, designed specifically for deterministic, low-latency shared memory in safety-critical and real-time embedded systems where concurrent access integrity is non-negotiable.

FAQ

What is the maximum operating temperature range for the IDT7026L35J?

The IDT7026L35J is rated for industrial temperature operation from –40°C to +85°C. This range is fully characterized across all AC and DC specifications including access time (35 ns max), standby current (1 mA typ), and BUSY arbitration timing - no derating required. It is not qualified for military (–55°C to +125°C) or commercial (0°C to +70°C) grades.

Does the IDT7026L35J support true simultaneous read/write to the same memory address?

Yes, the IDT7026L35J implements true dual-port memory cells that allow simultaneous access to the same location. When contention occurs, on-chip BUSY logic asserts BUSYL or BUSYR to stall one port while permitting the other to complete - ensuring data integrity without external arbitration circuitry. This behavior is guaranteed across the full industrial temperature range.

How does the M/S pin affect BUSY pin functionality on the IDT7026L35J?

When M/S = H, BUSYL and BUSYR operate as push-pull outputs indicating address contention; when M/S = L, they become inputs that externally inhibit writes to the respective port. In slave mode, the device relies on another master's BUSY signal - enabling hierarchical arbitration in multi-device arrays. The IDT7026L35J's BUSY outputs require no pull-up resistors due to their push-pull structure.

Can the IDT7026L35J be used in a 32-bit data bus configuration?

Yes, the IDT7026L35J supports 32-bit expansion via master/slave cascading. One device is configured as master (M/S = H), another as slave (M/S = L); BUSY outputs from the master feed BUSY inputs of slaves, and CE/R/W timing is synchronized to maintain full-speed operation. No additional logic is needed - the IDT7026L35J's native architecture enables seamless bus width scaling.

What is the purpose of the semaphore function in the IDT7026L35J?

The IDT7026L35J integrates eight hardware semaphore flags accessible via A0–A2 and I/O0, used to coordinate resource access between processors. Writing "0" to a semaphore grants exclusive access; writing "1" releases it. All 16 I/O pins reflect the flag value on read. This eliminates software-based locking and ensures atomic, glitch-free interprocessor signaling - critical for deterministic real-time systems.