Renesas 71342LA70J

Overview

IDT71342LA70J from Integrated Device Technology is a high-speed 4K × 8 dual-port static RAM with on-chip semaphore logic, operating at 70 ns max read cycle time, 5 V ±10% supply, and industrial temperature range (–40°C to +85°C). It supports fully asynchronous dual-port access, battery-backed data retention down to 2 V, and TTL-compatible I/O for real-time interprocessor communication in embedded control systems.

For engineers reviewing the IDT71342LA70J datasheet, IDT71342LA70J pinout, IDT71342LA70J application, or IDT71342LA70J equivalent, this device delivers deterministic port-to-port arbitration via hardware semaphores, low-power standby modes (as low as 1 mW typ.), and 64-pin TQFP packaging suitable for space-constrained industrial controllers and telecom line cards.

Technical Context

The IDT71342LA70J implements two independent, fully asynchronous memory ports-left (L) and right (R)-each with dedicated address (A0–A11), data (I/O0–I/O7), and control lines (CE, OE, R/W). Its on-chip semaphore logic block contains eight dedicated binary flag latches accessible via SEM pin activation and A0–A2 addressing, enabling lock-free token-passing coordination between processors without software overhead.

It features automatic power-down controlled by CE and SEM pins: when both are HIGH, each port enters full standby mode (ISB3 ≤ 4.0 mA typ.); battery backup operation is supported only in LA variants, retaining data at VCC = 2.0 V with ICCDR ≤ 1500 µA. Fabricated in CMOS, it meets TTL voltage thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V) and operates across –40°C to +85°C.

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 CY7C024AV-70AXC and IDT71322LA70J, the IDT71342LA70J uniquely combines 4K × 8 capacity, 5 V TTL compatibility, and guaranteed 2 V battery retention-making it the only option for legacy industrial systems requiring both scale and fail-safe data persistence.

Availability

IDT71342LA70J is available at Aetrix Electronics and suitable for industrial PLC controllers, telecom line cards, medical imaging subsystems, and avionics data concentrators requiring stable component supply across extended product lifecycles.

Supply support for IDT71342LA70J 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.

The IDT71342 product line was designed specifically for deterministic interprocessor communication in real-time embedded systems-emphasizing hardware-accelerated synchronization, low-latency memory access, and robust industrial reliability.

FAQ

What is the maximum operating frequency supported by the IDT71342LA70J?

The IDT71342LA70J does not specify a clock frequency because it is an asynchronous SRAM. Its performance is defined by timing parameters: maximum read cycle time (tRC) is 70 ns, supporting up to 14.3 million memory accesses per second per port under ideal conditions. Actual throughput depends on system-level address/data setup/hold timing and bus contention.

Does the IDT71342LA70J support true simultaneous read/write operations on both ports?

Yes-the IDT71342LA70J allows fully independent, asynchronous read or write access on left and right ports. However, simultaneous writes to the same memory location cause undefined data; semaphore logic prevents such conflicts by coordinating access to shared resources before memory access begins.

How does the semaphore logic in the IDT71342LA70J prevent race conditions?

The IDT71342LA70J implements atomic semaphore flag latches with priority resolution: when both ports attempt to claim the same flag simultaneously, internal logic guarantees only one side succeeds. A zero written to a flag locks write access to that side until a one is written-enforcing exclusive ownership without software intervention.

Can the IDT71342LA70J retain data during complete power loss?

No-the IDT71342LA70J requires ≥2.0 V on VCC to retain data. It supports battery backup during brownouts or brief interruptions, but cannot hold memory without any applied voltage. External supercapacitors or coin cells must maintain VCC ≥2.0 V to preserve contents.

Is the IDT71342LA70J pin-compatible with other members of the IDT71342 family?

Yes-the IDT71342LA70J shares identical 64-pin TQFP pinout with all IDT71342X70 variants (e.g., IDT71342SA70J), differing only in power consumption (LA = low-active, SA = standard-active) and data retention capability. No PCB changes are required when substituting within the same speed grade.