Renesas 71342SA35JI

Overview

IDT71342SA35JI from Integrated Device Technology is a high-speed 4K × 8 dual-port static RAM with on-chip semaphore logic, operating at 35 ns max read cycle time, supporting independent asynchronous access from left and right ports, and featuring TTL-compatible 5V ±10% supply - used in real-time interprocessor communication systems requiring concurrent memory access without software arbitration.

For engineers reviewing the IDT71342SA35JI datasheet, IDT71342SA35JI pinout, IDT71342SA35JI application, or IDT71342SA35JI equivalent, this device delivers deterministic port-to-port timing (tDDD ≤ 35 ns), hardware semaphore contention resolution (tSPS = 10 ns), and industrial-grade reliability (–40°C to +85°C) for embedded multiprocessor designs where lock-free resource sharing is critical.

Technical Context

The IDT71342SA35JI implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port - enabling simultaneous read/write operations across ports without bus contention. Its dedicated 3-bit semaphore address space (A0–A2) maps to eight independent latches accessible only when SEM = VIL and CE = VIH.

Semaphore operation uses active-low token passing: writing '0' to a flag grants exclusive write access to that side; reading returns replicated bit values across all I/O lines (D0–D7); and tSWR = 10 ns ensures minimal latency between semaphore write and subsequent read visibility on the opposing port.

Key Specifications

Pinout & Package

Package: 52-pin PLCC (PLG52), body size ≈ 20.0 mm × 20.0 mm × 4.3 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 CY7C1342BV35JC and IDT71342LA35JI, the IDT71342SA35JI uniquely balances industrial temperature tolerance, PLCC package compatibility, and optimized active/standby current trade-offs - making it the preferred choice for retrofitting legacy 52-pin systems requiring deterministic 35 ns dual-port timing without battery backup.

Availability

IDT71342SA35JI is available at Aetrix Electronics and suitable for real-time motion control, digital signal processor co-processing, redundant flight controller communication, and industrial PLC dual-core synchronization requiring stable component supply across extended production lifecycles.

Supply support for IDT71342SA35JI 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 solutions for high-performance computing and communications infrastructure.

The IDT71342 product line was designed specifically for deterministic interprocessor communication in tightly coupled multiprocessor systems - delivering hardware-accelerated semaphore arbitration to replace software-based locking mechanisms.

FAQ

What is the maximum operating temperature range for the IDT71342SA35JI?

The IDT71342SA35JI is rated for industrial operation from –40°C to +85°C. This range is validated per JEDEC JESD22-A108 and applies to all DC and AC electrical specifications including tRC = 35 ns, ISB1 = 25 mA, and semaphore timing parameters like tSPS = 10 ns. No derating is required within this envelope.

Does the IDT71342SA35JI support battery backup for data retention?

No, the IDT71342SA35JI does not support battery backup. Data retention capability (VDR = 2.0 V, ICCDR ≤ 1500 µA) is exclusive to the LA variant (e.g., IDT71342LA35JI). The SA suffix denotes standard power grade with no retention mode - confirmed by absence of VDR specification in SA-characterized tables.

How many semaphore flags does the IDT71342SA35JI provide, and how are they addressed?

The IDT71342SA35JI provides eight independent semaphore flags, accessed exclusively via A0–A2 address lines when SEM = VIL and CE = VIH. All other address bits (A3–A11) are ignored during semaphore access. Each flag is active-low and supports atomic set/test via D0 write/read replication across D0–D7 outputs.

What is the pin-compatible replacement for the IDT71342SA35JI in PLCC package?

The IDT71342SA35JI has no pin-compatible drop-in replacement. CY7C1342BV35JC matches speed and function but uses 64-pin TQFP (PNG64), requiring PCB redesign. IDT71342LA35JI shares identical PLCC pinout and timing but adds battery retention - making it a functional alternative only when data hold during power loss is needed.

Can both ports of the IDT71342SA35JI perform simultaneous writes to the same memory location?

No - simultaneous writes to the same non-semaphore memory location cause undefined data states and are prohibited per Functional Description. The device detects such conflicts but does not resolve them. Only semaphore flag writes are protected: simultaneous SEM-controlled writes to the same flag resolve deterministically within tSPS = 10 ns, ensuring exactly one port gains token ownership.