Renesas 71342LA70JI8

Overview

IDT71342LA70JI8 from Integrated Device Technology is a high-speed 4K × 8 dual-port static RAM with integrated hardware semaphore logic, operating at 70 ns max read/write cycle time, supporting independent asynchronous access from left and right ports, and featuring 2 V data retention in battery-backup mode - used in real-time interprocessor communication systems requiring concurrent memory access without software arbitration.

For engineers reviewing the IDT71342LA70JI8 datasheet, IDT71342LA70JI8 pinout, IDT71342LA70JI8 application, or IDT71342LA70JI8 equivalent, this device delivers deterministic port-to-port timing, TTL-compatible 5 V operation, industrial temperature support (–40°C to +85°C), and on-chip semaphore flag arbitration for lock-free shared resource management in embedded multiprocessor designs.

Technical Context

The IDT71342LA70JI8 implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port, enabling simultaneous read/write operations without bus contention except at non-semaphore memory locations. 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; only one side can assert a zero to set the flag, and release requires writing a one to the same latch. Power management includes four standby modes (ISB1–ISB4), with full CMOS-level disable yielding just 0.2 mA typical current at 5 V.

Key Specifications

Pinout & Package

Package: 64-pin TQFP (PNG64), 14 mm × 14 mm × 1.4 mm body, lead-free and 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 IDT71322LA70JGI, the IDT71342LA70JI8 uniquely combines 4K × 8 capacity, integrated hardware semaphore, and 2 V battery retention in a single 64-pin TQFP - eliminating external logic, reducing BOM count, and guaranteeing deterministic interprocessor coordination without firmware overhead.

Availability

IDT71342LA70JI8 is available at Aetrix Electronics and suitable for industrial motion control, avionics data concentrators, and medical imaging systems requiring stable component supply across extended product lifecycles.

Supply support for IDT71342LA70JI8 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.

IDT71342LA70JI8 belongs to the 71342 dual-port SRAM product line, designed specifically for deterministic interprocessor communication in real-time embedded systems where hardware arbitration eliminates software-induced latency and deadlock risk.

FAQ

What is the maximum operating frequency supported by IDT71342LA70JI8?

IDT71342LA70JI8 does not use a clock; it is an asynchronous SRAM. Its performance is defined by timing parameters - the 70 ns rating means tRC (read cycle time) and tWC (write cycle time) are guaranteed ≤70 ns under industrial conditions (VCC = 4.5–5.5 V, TA = –40°C to +85°C). This supports effective throughput up to ~14.3 MHz per port in burst-mode operation.

Does IDT71342LA70JI8 support true simultaneous read/write between ports?

Yes - IDT71342LA70JI8 allows independent, fully asynchronous read and write operations on left and right ports simultaneously. Conflicts occur only if both ports attempt to write to the same non-semaphore memory location; semaphore flags are protected against such contention by dedicated hardware logic that guarantees exclusive write access per flag.

How is data retention implemented in IDT71342LA70JI8, and what voltage range is supported?

IDT71342LA70JI8 supports battery backup data retention at VCC = 2.0 V minimum, drawing ≤1500 µA typical. This mode activates automatically when main supply drops below VDR threshold; data remains valid as long as VCC stays ≥2.0 V, enabling seamless failover to backup power without volatile loss.

Can IDT71342LA70JI8 be used with 3.3 V logic interfaces?

No - IDT71342LA70JI8 is strictly 5 V TTL-compatible: VIH = 2.2 V min, VIL = 0.8 V max, and VCC must be 4.5–5.5 V. Direct connection to 3.3 V logic requires level translation on all control, address, and data lines to avoid violating absolute maximum ratings or causing undefined behavior.

What happens if both ports attempt to write to the same semaphore flag at the same time?

IDT71342LA70JI8's semaphore logic guarantees resolution: only one port receives the token. If requests arrive simultaneously, assignment is deterministic but arbitrary - either left or right port wins. The losing port reads back '1' and must retry. No system hang occurs, and no external arbitration is needed - this is enforced entirely in hardware.