Renesas 71342LA20JG8

Overview

IDT71342LA20JG8 from Integrated Device Technology is a high-speed 4K × 8 dual-port static RAM with integrated hardware semaphore logic, operating at 20 ns max access time (commercial grade), 5 V ±10% supply, and industrial temperature range (–40°C to +85°C). It supports fully asynchronous, independent read/write access from left and right ports and enables interprocessor resource arbitration in real-time embedded control systems.

For engineers reviewing the IDT71342LA20JG8 datasheet, IDT71342LA20JG8 pinout, IDT71342LA20JG8 application, or IDT71342LA20JG8 equivalent, this device delivers deterministic port-to-port timing, battery-backed data retention down to 2 V, and on-chip semaphore flag management - critical for lock-free multiprocessor synchronization in avionics, industrial PLCs, and telecom line cards.

Technical Context

The IDT71342LA20JG8 implements two fully independent CMOS SRAM ports sharing a single 4K × 8 memory array, with separate address, data, and control lines per port. Its dedicated semaphore block contains eight binary latches accessible via A0–A2 and controlled by SEM and R/W, enabling atomic set/test operations without software polling overhead.

It features automatic power-down via CE and SEM pins: when both are HIGH, each port enters ultra-low standby (1 mW typ.), and the LA variant supports 2 V data retention mode. All timing parameters-including tAA (20 ns), tRC (20 ns), and tSOP (10 ns)-are specified under commercial conditions with TTL-compatible I/O and 5 V ±10% supply.

Key Specifications

Pinout & Package

Package: 64-pin Thin Quad Flat Package (TQFP), body size 14 mm × 14 mm × 1.4 mm, lead pitch 0.5 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 IDT71342LA20JG8, CY7C1354V25 offers higher data width but requires voltage translation and lacks data retention, while IDT71322LA25JG trades memory depth and speed for lower cost and footprint - making IDT71342LA20JG8 optimal for 4K/20 ns/2 V retention use cases.

Availability

IDT71342LA20JG8 is available at Aetrix Electronics and suitable for avionics flight control units, industrial PLC redundancy modules, and telecom line card buffers requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.

Supply support for IDT71342LA20JG8 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 infrastructure.

IDT71342LA20JG8 belongs to IDT's legacy dual-port SRAM product line, designed specifically for deterministic interprocessor communication in safety-critical and real-time embedded systems where hardware arbitration eliminates software-induced latency.

FAQ

What is the maximum access time specification for IDT71342LA20JG8?

IDT71342LA20JG8 has a maximum address access time (tAA) of 20 ns under commercial conditions (0°C to +70°C) and 25 ns under industrial conditions (–40°C to +85°C). This value is measured with VCC = 5.0 V ±10%, and it defines the delay from valid address assertion to valid data output on either port when CE and OE are active.

Does IDT71342LA20JG8 support true dual-port operation without arbitration logic?

Yes, IDT71342LA20JG8 supports fully asynchronous, independent access from left and right ports - reads and writes may occur simultaneously as long as they target different addresses. Conflicts on the same memory location are resolved by internal priority logic, and the integrated semaphore block provides hardware-level arbitration for shared resource management without external logic.

How does the 2 V data retention mode work in IDT71342LA20JG8?

IDT71342LA20JG8 enters data retention mode when VCC drops to ≥2.0 V while CE and SEM remain HIGH. In this state, the LA variant consumes ≤1500 µA and maintains all stored data indefinitely. The feature is exclusive to LA-grade parts and requires no external circuitry - simply connect a 2 V backup source to VCC during main power loss.

What is the function of the SEM pin on IDT71342LA20JG8?

The SEM pin on IDT71342LA20JG8 is an active-low semaphore enable that switches the device's address space from the main 4K × 8 RAM to the 8-bit semaphore register file. When SEM = LOW and CE = HIGH, A0–A2 select one of eight semaphore flags; D0 carries the write value, and all I/O pins reflect the flag state on read.

Which package does IDT71342LA20JG8 use, and is it RoHS-compliant?

IDT71342LA20JG8 uses the 64-pin TQFP (PNG64) package: 14 mm × 14 mm body, 0.5 mm lead pitch, 1.4 mm height. Per IDT documentation, this package is lead-free and RoHS-compliant, with JEDEC-standard moisture sensitivity level (MSL) 3 handling requirements.