Renesas 71342SA35J

Overview

IDT71342SA35J from Integrated Device Technology is a high-speed 4K × 8 dual-port static RAM with on-chip semaphore logic, designed for interprocessor communication in real-time embedded systems. It delivers 35 ns read cycle time, operates at 5V ±10%, supports independent asynchronous access from left and right ports, and features hardware semaphore flags for conflict-free resource arbitration in multiprocessor architectures.

For engineers reviewing the IDT71342SA35J datasheet, IDT71342SA35J pinout, IDT71342SA35J application, or IDT71342SA35J equivalent, this device is selected for deterministic low-latency shared memory access where simultaneous port operation, data coherency, and hardware-assisted synchronization are required - especially in industrial controllers, telecom line cards, and real-time test equipment.

Technical Context

The IDT71342SA35J implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port, enabling concurrent read/write operations without bus contention. Its dedicated 3-bit address space (A0–A2) accesses eight independent semaphore latches, each active-low and write-locked per port upon zero-write.

Semaphore arbitration uses edge-triggered request latches and priority resolution logic that guarantees single-token assignment even under simultaneous write attempts. Power management includes four standby modes (ISB1–ISB4), with full CMOS-level standby drawing only 1.0 mA typical at 5V - enabled by CE and SEM pins acting as independent port enable controls.

Key Specifications

Pinout & Package

Package: 64-pin TQFP (PNG64), body size 14 mm × 14 mm × 1.4 mm; lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C136-35JC, IDT71342SA35J eliminates external arbitration circuitry and reduces interprocessor latency by >90%; compared with IDT71422S35JG, it offers lower cost and smaller footprint but lacks extended temperature support and extra semaphore capacity.

Availability

IDT71342SA35J is available at Aetrix Electronics and suitable for industrial motion controllers, telecom line cards, automated test equipment, and avionics data recorders requiring stable component supply across multi-year production cycles.

Supply support for IDT71342SA35J 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, RF, and real-time interconnect solutions for high-performance computing and communications.

IDT71342SA35J belongs to IDT's legacy dual-port SRAM product line, engineered specifically for deterministic interprocessor communication in real-time embedded systems where hardware synchronization and minimal latency are critical.

FAQ

What is the maximum operating frequency supported by IDT71342SA35J?

IDT71342SA35J does not operate on a clock; it is an asynchronous SRAM. Its maximum effective throughput is determined by its 35 ns read cycle time (tRC), enabling up to 28.6 MHz sustained random access rate. Timing parameters such as tAA (35 ns max), tACE (35 ns max), and tAOE (20 ns max) define worst-case access windows for address, chip enable, and output enable paths respectively.

Does IDT71342SA35J support battery backup for data retention?

No, IDT71342SA35J does not support battery backup. Only the LA variant (e.g., IDT71342LA35J) provides 2V data retention capability. The SA suffix indicates standard power grade with no retention mode - it requires continuous 5V supply to maintain memory contents.

How are semaphore flags accessed in IDT71342SA35J?

Semaphore flags are accessed by asserting SEM=VIL (active-low) while holding CE=VIH, then applying address A0–A2 to select one of eight flags. Only I/O0 is used for writing; reading returns the flag state across all eight I/O pins. The semaphore space is completely separate from main memory and ignores A3–A11.

Can both ports of IDT71342SA35J perform simultaneous writes to the same memory location?

No - simultaneous writes to the same non-semaphore memory location cause undefined data and are prohibited per design. The device detects such conflicts and may produce indeterminate outputs. Semaphores are protected against this; only one port can modify a semaphore flag at a time due to hardware locking.

What package type is used for IDT71342SA35J?

IDT71342SA35J is packaged in a 64-pin TQFP (Thin Quad Flat Package), designated PNG64, with dimensions 14 mm × 14 mm × 1.4 mm. This surface-mount package supports fine-pitch PCB layouts and meets JEDEC standard MS-026.