Renesas 71342LA25PF

Overview

IDT71342LA25PF from Integrated Device Technology is a high-speed 4K × 8 dual-port static RAM with on-chip semaphore logic, TTL-compatible 5V operation, 25ns max access time (industrial grade), and battery-backed data retention down to 2V. It enables concurrent asynchronous read/write access from left and right ports in real-time interprocessor communication systems such as industrial PLCs and telecom line cards.

For engineers reviewing the IDT71342LA25PF datasheet, IDT71342LA25PF pinout, IDT71342LA25PF application, or IDT71342LA25PF equivalent, key selection criteria include dual-port timing isolation, hardware semaphore arbitration latency (tSOP = 10ns), 2V data retention capability, and PLCC-52 package compatibility with legacy board layouts.

Technical Context

The IDT71342LA25PF implements fully independent left/right port control logic with separate address decoders, I/O drivers, and CE/OE/R/W signal paths-ensuring zero timing coupling between ports. Its semaphore block contains eight dedicated latches accessible via A0–A2 with SEM pin acting as chip select, supporting token-passing allocation without software polling overhead.

It uses CMOS process technology for low-power operation: 700mW typical active power and 1mW typical standby power at 5V; in battery backup mode (V_CC = 2V), it retains data with only 100µA typical current draw. The device supports industrial temperature range (–40°C to +85°C) and requires no external arbitration logic.

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 and IDT71344LA25PF, the IDT71342LA25PF uniquely delivers 2V data retention in the PLCC-52 form factor-making it the only drop-in solution for legacy industrial boards requiring battery-backed dual-port memory at minimal layout change.

Availability

IDT71342LA25PF is available at Aetrix Electronics and suitable for industrial PLCs, telecom line cards, avionics sensor hubs, and medical imaging subsystems requiring stable component supply across long production lifecycles.

Supply support for IDT71342LA25PF 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 high-performance timing, memory, and interface solutions for communications and industrial markets.

The IDT71342LA25PF belongs to IDT's legacy dual-port SRAM product line, designed specifically for deterministic interprocessor communication in real-time embedded systems where hardware semaphore arbitration eliminates software overhead.

FAQ

What is the maximum operating temperature range for the IDT71342LA25PF?

The IDT71342LA25PF is rated for industrial temperature operation from –40°C to +85°C across all specified electrical parameters including access time, power consumption, and data retention. This range is validated per the manufacturer's datasheet DSC 2621/16 and applies to both SRAM and semaphore functions without derating.

Does the IDT71342LA25PF support true simultaneous read/write between ports?

Yes-the IDT71342LA25PF allows fully independent asynchronous read and write operations on left and right ports. However, simultaneous write-to-same-address or read/write conflict on non-semaphore locations is undefined; semaphores must be used to coordinate access to shared memory regions to prevent corruption.

How does the semaphore logic in the IDT71342LA25PF prevent race conditions?

The IDT71342LA25PF uses dedicated hardware latches with priority resolution: when both ports attempt to claim the same semaphore flag simultaneously, the logic guarantees only one side receives the token. A zero written to D0 sets the flag for that port; subsequent reads reflect the locked state until the owning port writes a one to release it.

Can the IDT71342LA25PF retain data at 2V supply without external circuitry?

Yes-the IDT71342LA25PF supports native 2V data retention per its LA variant specification. At V_CC = 2V, it draws ≤1500µA typical current and maintains stored data indefinitely, requiring only a backup battery connected directly to V_CC with no additional regulators or supervisors.

Is the IDT71342LA25PF pin-compatible with other members of the IDT71342 family?

The IDT71342LA25PF shares identical pinout and function mapping with IDT71342SA25PF and IDT71342LA20PF in the PLCC-52 package. Differences are limited to speed grade (20ns vs. 25ns) and power profile (SA = standard active power, LA = low-power + retention); no PCB changes are needed when substituting within the same package variant.