Renesas 71342SA35J8

Overview

IDT71342SA35J8 from Integrated Device Technology is a high-speed 4K × 8 dual-port static RAM with on-chip semaphore logic, operating at 35 ns max read cycle time, 5 V ±10% supply, and industrial temperature range (–40°C to +85°C). It supports fully asynchronous, independent access from left and right ports and enables interprocessor resource arbitration in real-time embedded control systems.

For engineers reviewing the IDT71342SA35J8 datasheet, IDT71342SA35J8 pinout, IDT71342SA35J8 application, or IDT71342SA35J8 equivalent, this device delivers deterministic port-to-port timing, hardware-managed semaphore flag contention resolution, low-power standby modes (1.0 mA full standby), and TTL-compatible I/O for legacy bus interfacing in multiprocessor data exchange architectures.

Technical Context

The IDT71342SA35J8 implements two fully independent SRAM ports-left (L) and right (R)-each with dedicated address (A0–A11), data (I/O0–I/O7), and control lines (CE, OE, R/W), enabling concurrent read/write operations without mutual timing degradation. Its integrated semaphore block contains eight dedicated binary flags accessed via SEM pin activation and A0–A2 addressing, with active-low token semantics and automatic contention arbitration.

It uses CMOS high-performance fabrication for 700 mW typical active power consumption and supports multiple standby modes: ISB1 (TTL-level CE high), ISB3 (CMOS-level CE > VCC − 0.2 V), and battery-backed data retention (2 V, LA only-IDT71342SA35J8 is SA grade and excludes retention). The device requires no external arbitration logic and operates with single 5 V supply.

Key Specifications

Pinout & Package

Package: 64-pin TQFP (PNG64), 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 applications.

Compared with CY7C1355BV33-167AXC and IDT71V32S15YG8, the IDT71342SA35J8 uniquely integrates hardware semaphore arbitration and 5 V TTL compatibility-enabling drop-in replacement in legacy industrial designs requiring deterministic, zero-software-overhead interprocessor coordination without voltage translation or external logic.

Availability

IDT71342SA35J8 is available at Aetrix Electronics and suitable for motor control systems, telecom line cards, industrial PLC backplanes, and avionics data concentrators requiring stable component supply across extended product lifecycles.

Supply support for IDT71342SA35J8 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, RF, and real-time interconnect solutions for communications, computing, and industrial markets.

IDT71342SA35J8 belongs to IDT's legacy dual-port SRAM product line, designed specifically for deterministic, low-latency interprocessor communication in real-time embedded systems where hardware-managed resource arbitration is critical.

FAQ

What is the maximum operating frequency supported by IDT71342SA35J8?

IDT71342SA35J8 does not specify a maximum clock frequency but defines timing via cycle times: its 35 ns max read cycle time (tRC) corresponds to a theoretical maximum sustained access rate of 28.6 MHz per port. Actual system throughput depends on bus turnaround, address setup, and control signal timing margins-not a fixed clock input. The device operates asynchronously and has no internal clock generator.

Does IDT71342SA35J8 support battery backup for data retention?

No, IDT71342SA35J8 is the SA (standard power) variant and does not support battery backup data retention. Only the LA variant (e.g., IDT71342LA35J8) specifies 2 V data retention capability. The SA version draws 1.0 mA typical in full standby (ISB3) but requires continuous 5 V supply to retain memory contents.

How many semaphore flags does IDT71342SA35J8 provide, and how are they accessed?

IDT71342SA35J8 provides eight independent binary semaphore flags. They reside in a dedicated address space accessed only when SEM = LOW (active), using A0–A2 for selection (000–111). Only I/O0 is used for writing; reads return the flag state across all eight I/O lines (0x00 or 0xFF). Each flag supports atomic set/test via write-0/read sequence.

What package type is used for IDT71342SA35J8?

IDT71342SA35J8 is packaged in a 64-pin TQFP (Thin Quad Flat Package), designated PNG64, with dimensions 14 mm × 14 mm × 1.4 mm and 0.5 mm lead pitch. This surface-mount package supports automated assembly and offers better thermal performance and lower inductance than the alternative 52-pin PLCC option.

Can both ports of IDT71342SA35J8 perform read and write operations simultaneously?

Yes-IDT71342SA35J8 supports fully independent, asynchronous read/write operations on left and right ports simultaneously. However, simultaneous write-to-write or read-to-write access to the *same memory location* (non-semaphore) causes undefined data; semaphore locations are protected against such conflicts by dedicated hardware logic that resolves contention deterministically.