Renesas 71342SA55PFI8

Overview

IDT71342SA55PFI8 from Integrated Device Technology is a high-speed 4K × 8 dual-port static RAM with on-chip semaphore logic, operating at 55 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 control.

For engineers reviewing the IDT71342SA55PFI8 datasheet, IDT71342SA55PFI8 pinout, IDT71342SA55PFI8 application, or IDT71342SA55PFI8 equivalent, this device delivers deterministic port-to-port arbitration via hardware semaphores, low-power standby modes (ISB3 = 1.0 mA typ.), and industrial-grade reliability across –40°C to +85°C - critical for embedded multiprocessor designs where software handshaking introduces latency.

Technical Context

The IDT71342SA55PFI8 implements fully asynchronous dual-port architecture with separate address, data, and control buses per port (A0L–A11L/I/O0L–I/O7L/R/WL/CEL/OEL vs A0R–A11R/I/O0R–I/O7R/R/WR/CER/OER), enabling simultaneous read/write operations without bus contention except at non-semaphore memory locations. Its dedicated 3-bit semaphore address space (A0–A2) is accessed via SEM pin assertion and uses only I/O0 for write, broadcasting flag state across all 8 I/O lines on read.

Semaphore logic consists of eight independent latches with automatic contention resolution: simultaneous zero-write requests guarantee exclusive token assignment to one port, while failed requests require explicit reset (write '1') to avoid system hang. Power management uses CE and SEM pins to gate port-level circuitry into full CMOS standby (ISB3) or TTL-level standby (ISB1), with no external power sequencing required.

Key Specifications

Pinout & Package

Package: 64-pin TQFP (PNG64), 14 mm × 14 mm × 1.4 mm body, 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 CY7C1362BV33-55AXC and IDT71322LA55PFI, the IDT71342SA55PFI8 uniquely combines 5V operation, hardware semaphore logic, and industrial temperature range in a single package - eliminating external arbitration components while maintaining compatibility with legacy 5V controller designs.

Availability

IDT71342SA55PFI8 is available at Aetrix Electronics and suitable for real-time motion control, avionics data buffering, medical imaging pipelines, industrial PLC communication hubs, and embedded multiprocessor systems requiring stable component supply with guaranteed long-term availability.

Supply support for IDT71342SA55PFI8 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 sensor solutions for high-performance computing and communications.

The IDT71342 product line was designed specifically for deterministic interprocessor communication in tightly coupled multiprocessor systems - delivering hardware-accelerated resource arbitration without sacrificing memory bandwidth or introducing software overhead.

FAQ

What is the maximum clock frequency supported by IDT71342SA55PFI8?

IDT71342SA55PFI8 does not use a clock signal - it is a fully asynchronous dual-port SRAM. Its timing is governed by access parameters like tRC (55 ns max) and tAA (55 ns max), allowing continuous read/write operations as fast as the external control logic can sequence them without synchronization constraints.

Does IDT71342SA55PFI8 support battery backup operation?

No - IDT71342SA55PFI8 is the SA (standard power) variant and lacks battery backup capability. Only the LA variant (e.g., IDT71342LA55PFI8) supports 2V data retention. The SA version requires continuous 5V supply to maintain memory contents.

How many semaphore flags does IDT71342SA55PFI8 provide, and how are they addressed?

IDT71342SA55PFI8 provides eight hardware semaphore flags, accessed via A0–A2 address lines when SEM is asserted (low). Each flag occupies a unique 3-bit address (000–111); higher address bits (A3–A11) are ignored during semaphore access.

Can both ports of IDT71342SA55PFI8 perform simultaneous writes to the same memory location?

No - simultaneous writes to the same non-semaphore memory location cause undefined data. The device permits concurrent reads/writes only to different addresses. Semaphore locations are protected against conflict via hardware arbitration, but standard RAM cells lack write collision resolution.

What is the function of the SEM pin on IDT71342SA55PFI8?

The SEM pin on IDT71342SA55PFI8 is an active-low semaphore enable that selects the internal 3-bit semaphore register space. When SEM = L and CE = H, the device responds to A0–A2 addresses and uses I/O0 for flag writes; all I/O lines reflect the flag state on read.