Renesas 71342SA25J8

Overview

IDT71342SA25J8 from Integrated Device Technology is a high-speed 4K × 8 dual-port static RAM with on-chip semaphore logic, operating at 25 ns (max) access time, 5 V ±10% supply, and industrial temperature range (–40°C to +85°C). It supports fully asynchronous, independent read/write access from left and right ports and enables interprocessor resource arbitration in real-time embedded control systems.

For engineers reviewing the IDT71342SA25J8 datasheet, IDT71342SA25J8 pinout, IDT71342SA25J8 application, or IDT71342SA25J8 equivalent, this device is selected for deterministic, zero-wait-state shared memory architectures requiring hardware-managed mutual exclusion between two CPUs or DMA controllers.

Technical Context

The IDT71342SA25J8 implements two fully independent CMOS SRAM ports-left (L) and right (R)-each with dedicated address (A0–A11), data (I/O0–I/O7), and control lines (CE, OE, R/W). Memory array size is 4,096 × 8 bits per port, with separate 3-bit address space (A0–A2) for eight semaphore latches.

Semaphore operation requires CE = VIH and SEM = VIL; SRAM access requires CE = VIL and SEM = VIH. The semaphore logic guarantees atomic flag acquisition-even under simultaneous write requests-with priority resolved by signal arrival timing, and all flags are active-low with token release via write-1.

Key Specifications

Pinout & Package

Package: 52-pin PLCC (PLG52), body size ≈ 20.0 mm × 20.0 mm × 4.3 mm, lead-free compatible, surface-mountable.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1355KV18-250BZI and IDT71322LA25JG, the IDT71342SA25J8 uniquely delivers full 4K × 8 depth with native hardware semaphore support in a drop-in PLCC-52 footprint-enabling faster time-to-market for deterministic dual-CPU architectures without redesigning arbitration infrastructure.

Availability

IDT71342SA25J8 is available at Aetrix Electronics and suitable for real-time motion control, industrial PLC redundancy, avionics data concentration, and medical imaging subsystems requiring stable component supply across extended production lifecycles.

Supply support for IDT71342SA25J8 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 power solutions for high-performance computing and industrial systems.

IDT71342SA25J8 belongs to IDT's legacy dual-port SRAM product line, engineered specifically for deterministic, low-latency interprocessor communication in safety-critical embedded control applications.

FAQ

What is the maximum guaranteed access time for IDT71342SA25J8?

IDT71342SA25J8 has a maximum access time (tAA) of 25 ns across the full industrial temperature range (–40°C to +85°C) and supply voltage (4.5 V to 5.5 V). This value is production-tested and specified in the AC Electrical Characteristics table for the "71342X25" speed grade. The IDT71342SA25J8 achieves this performance using high-speed CMOS process technology and optimized internal decoding paths.

Does IDT71342SA25J8 support battery backup data retention?

No, IDT71342SA25J8 does not support battery backup data retention. That capability is exclusive to the LA variant (e.g., IDT71342LA25J8), which specifies 2 V data retention and 100 µA typical retention current. The SA suffix denotes standard power consumption and excludes the low-voltage retention circuitry present in LA versions.

How are the semaphore flags addressed and controlled in IDT71342SA25J8?

In IDT71342SA25J8, the eight semaphore flags are accessed using address lines A0–A2 only, while A3–A11 are ignored. Semaphore mode is enabled by asserting SEM = VIL (low), with CE = VIH. Writing a 0 to I/O0 sets the flag (grants token); writing a 1 releases it. Reads return the flag state across all I/O pins (0x00 or 0xFF).

Can both ports of IDT71342SA25J8 perform simultaneous read operations?

Yes, IDT71342SA25J8 supports fully independent, concurrent read operations on both left and right ports with no timing interference. Each port has its own address decoder, sense amplifiers, and output drivers. Simultaneous reads do not degrade access time or increase power beyond the sum of individual port ISB currents.

What is the function of the N/C pins on IDT71342SA25J8 in the PLCC-52 package?

IDT71342SA25J8 has multiple N/C (no-connect) pins in its PLCC-52 package-including pins 1, 7, 46, and 47 per the official pin diagram. These pins are not bonded to the die and must remain unconnected on the PCB. Routing traces or applying voltage to N/C pins violates the manufacturer's design rules and may cause functional instability or ESD vulnerability.