Renesas 71342LA25PFI8

Overview

IDT71342LA25PFI8 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, supporting independent asynchronous reads/writes on left and right ports, and featuring battery-backed data retention down to 2 V. It is used in real-time interprocessor communication systems requiring concurrent memory access without software arbitration.

For engineers reviewing the IDT71342LA25PFI8 datasheet, IDT71342LA25PFI8 pinout, IDT71342LA25PFI8 application, or IDT71342LA25PFI8 equivalent, key selection criteria include dual-port timing isolation, hardware semaphore flag arbitration, 52-pin PLCC industrial-temperature packaging, and 2 V data retention capability for fail-safe operation.

Technical Context

The IDT71342LA25PFI8 implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port - no shared timing constraints between left and right sides. Its dedicated 3-bit address space (A0–A2) accesses eight independent semaphore latches, each active-low and write-locked per side upon zero-write.

Semaphore arbitration uses dual request latches feeding a shared flag; simultaneous zero-writes are resolved deterministically with guaranteed single-side token assignment. Power management employs CE and SEM pins to gate port-level circuitry into low-power standby modes, achieving 1 mW typical standby power with CMOS-level inputs.

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 0.635 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C024AV-25AXC and IDT71322LA25PFI, the IDT71342LA25PFI8 uniquely delivers full 4K × 8 capacity plus eight hardware semaphores in a single 52-pin PLCC package - eliminating external arbitration components while supporting larger shared data structures and deterministic inter-core coordination.

Availability

IDT71342LA25PFI8 is available at Aetrix Electronics and suitable for real-time dual-processor systems, industrial PLC communication modules, and avionics data concentrators requiring stable component supply with long lifecycle support.

Supply support for IDT71342LA25PFI8 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.

The IDT71342 family was designed specifically for deterministic interprocessor communication in embedded real-time systems, emphasizing hardware-accelerated resource arbitration and low-latency memory sharing without software overhead.

FAQ

What is the maximum guaranteed access time for IDT71342LA25PFI8?

The IDT71342LA25PFI8 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 guaranteed per the datasheet's AC Electrical Characteristics table for the "X25" speed grade. The IDT71342LA25PFI8 achieves this performance using high-speed CMOS process technology and optimized internal decoding paths.

Does IDT71342LA25PFI8 support true simultaneous read/write operations between ports?

Yes, the IDT71342LA25PFI8 supports fully independent asynchronous read and write operations on left and right ports - including simultaneous access to different memory locations. However, simultaneous writes to the same address or a read/write conflict on a non-semaphore location results in undefined data; semaphores themselves are protected against such conflicts by dedicated arbitration logic. The IDT71342LA25PFI8 does not require external synchronization signals to maintain data integrity across ports.

How does the semaphore logic in IDT71342LA25PFI8 resolve contention when both ports attempt to claim the same flag?

The IDT71342LA25PFI8 semaphore logic guarantees deterministic resolution: if both ports write zero to the same semaphore flag simultaneously, exactly one port receives the token - never both or neither. If one port asserts its request earlier, it wins. The resolution occurs within the tSPS (semaphore contention window) of 10 ns, and the winning port sees a zero on subsequent reads while the losing port reads a one. This behavior is hardwired and requires no firmware intervention - a core feature of the IDT71342LA25PFI8.

Can IDT71342LA25PFI8 retain data when VCC drops below 4.5 V?

Yes - the IDT71342LA25PFI8 (LA variant) supports data retention down to 2.0 V, enabling use with backup batteries or supercapacitors. During retention mode, CE and SEM must be held high, and ICCDR is specified at 100 µA typical (1500 µA max) at 2 V. This capability is exclusive to LA-grade parts like the IDT71342LA25PFI8 and is not available in SA variants. Retention timing parameters (tCDR, tR) are characterized but not production-tested.

What package type is used for IDT71342LA25PFI8, and are there thermal considerations?

IDT71342LA25PFI8 uses a 52-pin Plastic Leaded Chip Carrier (PLCC) package (code PLG52), with body dimensions approximately 20.0 mm × 20.0 mm × 4.3 mm. Thermal resistance (θJA) is not explicitly specified in the datasheet, but the device's low active power (700 mW typ.) and 1 mW standby power minimize self-heating. For sustained operation at +85°C ambient, ensure adequate PCB copper pour under the package and avoid stacking heat-generating components nearby. The IDT71342LA25PFI8 does not require a heatsink under normal industrial conditions.