Renesas 71342LA25JI

Overview

IDT71342LA25JI 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 over –40°C to +85°C industrial temperature range, powered by single 5V ±10% supply, and supporting independent asynchronous read/write on left/right ports for real-time interprocessor communication in embedded control systems.

For engineers reviewing the IDT71342LA25JI datasheet, IDT71342LA25JI pinout, IDT71342LA25JI application, or IDT71342LA25JI equivalent, this page delivers verified timing specs, validated PLCC-52 pin mapping, battery-backed data retention capability (2V), TTL-compatible I/O, and hardware semaphore arbitration - all critical for deterministic multi-CPU memory sharing in avionics, industrial PLCs, and telecom line cards.

Technical Context

The IDT71342LA25JI implements fully asynchronous dual-port architecture with separate address, control, and data buses per port, enabling concurrent access without bus contention. Its dedicated 3-bit address space (A0–A2) selects among eight independent semaphore latches, each accessible only when SEM = VIL and CE = VIH.

Semaphore operation uses active-low token passing: writing '0' to a flag grants exclusive write access to that side; writing '1' releases it. The latch design guarantees atomic flag acquisition even under simultaneous request, resolving contention via deterministic priority logic - no software arbitration overhead required.

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, 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 CY7C024AV-25AXC and IDT71321LA25JG, the IDT71342LA25JI uniquely combines 4K × 8 density, 25 ns industrial-grade timing, 2V battery retention, and integrated hardware semaphores in a single 5V-compatible PLCC-52 package - eliminating external logic, voltage translation, and firmware complexity.

Availability

IDT71342LA25JI is available at Aetrix Electronics and suitable for industrial PLCs, avionics control units, and telecom line cards requiring stable component supply across extended product lifecycles and rigorous environmental qualification.

Supply support for IDT71342LA25JI 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 solutions for high-performance computing and communications infrastructure.

The IDT71342 family was designed specifically for deterministic interprocessor communication in real-time embedded systems - delivering hardware-accelerated memory sharing without sacrificing timing predictability or power efficiency.

FAQ

What is the maximum operating temperature range for the IDT71342LA25JI?

The IDT71342LA25JI is rated for industrial temperature operation from –40°C to +85°C, validated per JEDEC JESD22-A108. This range ensures reliable performance in uncontrolled environments such as factory automation cabinets and outdoor wireless base stations where ambient temperatures exceed commercial limits.

Does the IDT71342LA25JI support true simultaneous read/write between ports?

Yes, the IDT71342LA25JI supports fully asynchronous, simultaneous read and write operations on left and right ports - provided non-semaphore addresses are accessed. Conflicts are prevented by hardware semaphore logic, which enforces exclusive access to shared resources without CPU intervention or wait states.

How does battery backup work on the IDT71342LA25JI?

The IDT71342LA25JI supports data retention at VCC ≥ 2.0 V, allowing connection to a 2V lithium coin cell during main power loss. At 2V, typical retention current is 100 µA, preserving all 4K × 8 memory contents indefinitely - no external power-switching circuitry is required.

What is the function of the SEM pins on the IDT71342LA25JI?

The SEML and SEMR pins are active-low semaphore enable controls. When asserted (VIL), they select the internal 8-bit semaphore register space instead of the main RAM array. Only A0–A2 address bits are decoded for semaphore access; writes to D0 set/clear flags, and reads return the flag state across all 8 data lines.

Is the IDT71342LA25JI pin-compatible with other members of the IDT71342 family?

The IDT71342LA25JI shares identical PLCC-52 pinout with all IDT71342X25 variants (e.g., IDT71342SA25JI), differing only in power consumption and retention capability. SA versions lack battery backup and exhibit higher standby current; LA versions retain data at 2V and achieve 0.2 µA ISB3.