Renesas 71342SA25PF8

Overview

IDT71342SA25PF8 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 (industrial grade), supporting fully asynchronous independent read/write on left and right ports, and featuring TTL-compatible 5V ±10% supply - used in real-time interprocessor communication systems requiring deterministic resource arbitration.

For engineers reviewing the IDT71342SA25PF8 datasheet, IDT71342SA25PF8 pinout, IDT71342SA25PF8 application, or IDT71342SA25PF8 equivalent, this page delivers verified timing parameters, validated PLCC-52 package mapping, confirmed dual-port + semaphore functional partitioning, and two industry-validated alternative parts for shared-memory embedded control designs.

Technical Context

The IDT71342SA25PF8 implements two fully independent asynchronous memory ports sharing a single 4K × 8 SRAM array, with separate address (A0–A11), data (I/O0–I/O7), and control (CE, OE, R/W) lines per port. Semaphore logic resides in a dedicated 8-location address space (A0–A2 only), accessed via SEM pin assertion while CE = VIH.

Each port supports concurrent read/write operations except on non-semaphore addresses; semaphore flags are active-low latches with automatic contention resolution - when both ports write '0' simultaneously to the same flag, hardware guarantees exclusive token assignment to one side without software intervention.

Key Specifications

Pinout & Package

Package: 52-pin Plastic Leaded Chip Carrier (PLCC), body size ≈ 20.0 mm × 20.0 mm × 4.3 mm, lead pitch 0.65 mm, 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 CY7C1355BV33-25BGXI and AS7C34098B-25JCIN, the IDT71342SA25PF8 uniquely delivers 5V TTL compatibility, hardware semaphore arbitration, and industrial temperature support in a single PLCC-52 package - eliminating level shifters, external logic, and qualification risk in legacy-reliant embedded systems.

Availability

IDT71342SA25PF8 is available at Aetrix Electronics and suitable for industrial motion controllers, avionics data concentrators, medical imaging pipelines, telecom baseband processors, and real-time interprocessor communication systems requiring stable component supply across extended product lifecycles.

Supply support for IDT71342SA25PF8 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 communications infrastructure.

IDT71342SA25PF8 belongs to IDT's legacy dual-port SRAM product line, engineered specifically for deterministic interprocessor communication in safety-critical and real-time embedded systems where hardware-enforced resource arbitration is mandatory.

FAQ

What is the maximum operating temperature range for IDT71342SA25PF8?

IDT71342SA25PF8 is rated for industrial temperature operation from −40°C to +85°C, with all AC and DC specifications guaranteed across this full range. This includes the 25 ns maximum access time (tAA), standby current limits (ISB1–ISB4), and semaphore timing parameters (tSPS, tSWR). The device uses CMOS process technology optimized for thermal stability in harsh environments.

Does IDT71342SA25PF8 support battery backup for data retention?

No, IDT71342SA25PF8 does not support battery backup. Only the LA variant (e.g., IDT71342LA25PF8) provides 2V data retention capability. The SA suffix indicates standard power version with typical active current of 170 mA and standby current as low as 0.2 mA in full CMOS standby mode (ISB3), but no V_DR specification or retention testing.

How are the semaphore flags addressed and accessed in IDT71342SA25PF8?

Semaphore flags in IDT71342SA25PF8 occupy a separate 8-location address space accessed exclusively via A0–A2 pins. To access semaphores, SEM must be asserted low while CE is held high (VIH); R/W and OE control read/write operations. Only I/O0 is used for writing semaphore values (0 = request token, 1 = release), and reads return the flag state across all 8 I/O lines.

What package type is used for IDT71342SA25PF8?

IDT71342SA25PF8 is packaged in a 52-pin Plastic Leaded Chip Carrier (PLCC) with JEDEC MO-047AC outline. Pin configuration matches the "PLG52(4)" diagram in the datasheet, including dedicated left/right address, data, and control signals plus dual SEM pins. The package is lead-free and RoHS-compliant, with body dimensions approximately 20.0 mm × 20.0 mm × 4.3 mm.

Can both ports of IDT71342SA25PF8 perform simultaneous read/write operations?

Yes, IDT71342SA25PF8 supports fully asynchronous simultaneous read/write operations on left and right ports - provided they target different memory locations. Concurrent access to the same non-semaphore address causes undefined data; however, semaphore flags are protected against such conflicts via dedicated hardware arbitration logic that guarantees exclusive token assignment even on simultaneous requests.