Renesas 71342SA45J

Overview

IDT71342SA45J from Integrated Device Technology is a high-speed 4K × 8 dual-port static RAM with on-chip semaphore logic, operating at 45 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 arbitration wait states.

For engineers reviewing the IDT71342SA45J datasheet, IDT71342SA45J pinout, IDT71342SA45J application, or IDT71342SA45J equivalent, this device delivers deterministic port-to-port timing (tDDD = 45 ns), hardware semaphore contention resolution (tSPS = 10 ns), low-power standby (ISB3 = 1.0 mA), and industrial-grade reliability in PLCC-52 packaging for embedded multiprocessor designs.

Technical Context

The IDT71342SA45J 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 address space (A0–A2) selects one of eight semaphore latches, accessed only when SEM = VIL and CE = VIH.

Semaphore logic uses dual request latches per flag with priority arbitration: a zero written to D0 sets the flag for that port exclusively until a one is written back; reads return latched flag state across all 8 I/O lines. Power-down is controlled independently per port via CE and SEM high states, achieving ISB3 = 1.0 mA full standby current at 5V.

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 applications.

Compared with CY7C1354V25-45AXI, IDT71342SA45J reduces BOM count and PCB footprint by integrating semaphore logic, while versus IDT71342LA45J it trades data retention capability for lower cost and optimized commercial-temperature performance.

Availability

IDT71342SA45J is available at Aetrix Electronics and suitable for industrial motion controllers, avionics data concentrators, and medical imaging pipelines requiring stable component supply across multi-year production cycles.

Supply support for IDT71342SA45J 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.

IDT71342SA45J belongs to the IDT71342 dual-port SRAM product line, designed specifically for deterministic interprocessor communication in real-time embedded systems where hardware arbitration eliminates software-induced latency.

FAQ

What is the maximum operating frequency supported by IDT71342SA45J?

IDT71342SA45J does not operate on a clock signal - it is fully asynchronous. Its maximum effective throughput is determined by tRC = 45 ns, yielding up to 22.2 million read/write cycles per second per port. Real-world sustained bandwidth depends on address and control signal timing margins, but no external clock is required for operation.

Does IDT71342SA45J support battery backup operation?

No. IDT71342SA45J is the SA (Standard Active) grade and does not support battery backup or 2V data retention. That capability is exclusive to the LA (Low-power Active) variant, such as IDT71342LA45J. The SA version requires continuous 5V supply to maintain data integrity.

How many semaphore flags does IDT71342SA45J provide, and how are they addressed?

IDT71342SA45J provides eight independent hardware semaphore flags. They reside in a dedicated address space selected only when SEM = VIL and CE = VIH. Addressing uses A0–A2 (3 bits), allowing selection of any one of the eight flags; A3–A11 are ignored during semaphore access.

Can both ports write to the same memory location simultaneously on IDT71342SA45J?

No. Simultaneous writes to the same non-semaphore memory location cause undefined data and are prohibited per the functional description. The device does not include internal write collision detection or resolution logic. System-level arbitration (via semaphores or external logic) is required to prevent conflicting writes.

What is the meaning of "SA" in IDT71342SA45J?

"SA" denotes the Standard Active power grade within the IDT71342 family. It specifies typical active current (ICC = 140 mA) and standby current (ISB1 = 25 mA) at 5V, targeting commercial-temperature applications (0°C to +70°C). It contrasts with "LA", which offers lower power and extended temperature range.