Renesas 71342LA20JG

Overview

IDT71342LA20JG from Integrated Device Technology is a high-speed 4K × 8 dual-port static RAM with on-chip semaphore logic, operating at 20 ns (max) access time, 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 IDT71342LA20JG datasheet, IDT71342LA20JG pinout, IDT71342LA20JG application, or IDT71342LA20JG equivalent, this device delivers deterministic port-to-port timing, battery-backed data retention down to 2 V, hardware semaphore contention resolution, and low-power standby operation critical for multi-processor communication and shared-memory architectures.

Technical Context

The IDT71342LA20JG integrates two independent CMOS SRAM ports sharing a single 4K × 8 memory array, with dedicated 3-bit address space (A0–A2) for eight semaphore latches accessed via SEM = VIL. Each port has full control independence: separate CE, OE, R/W, and address buses ensure no timing coupling between left and right operations.

Semaphore logic implements token-passing allocation using active-low flags: writing '0' requests the token, writing '1' releases it, and simultaneous write attempts are resolved deterministically by internal priority circuitry. Data retention mode activates when VCC drops to 2.0 V, drawing ≤1500 µA while preserving contents - a feature exclusive to LA-grade variants.

Key Specifications

Pinout & Package

Package: 52-pin PLCC (PLG52), body size 20.0 mm × 20.0 mm × 4.3 mm, lead-free compatible, industrial-grade thermal profile.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-port SRAM applications.

Compared with CY7C1355KV18-200BZI and AS7C34098A-20JCIN, the IDT71342LA20JG uniquely combines deterministic 20 ns dual-port access, on-die semaphore arbitration, and industrial temperature support - making it irreplaceable for tightly coupled multi-processor systems requiring guaranteed resource coherency without software overhead.

Availability

IDT71342LA20JG is available at Aetrix Electronics and suitable for industrial motion control, telecom infrastructure, medical imaging subsystems, and avionics display processors requiring stable component supply across extended product lifecycles.

Supply support for IDT71342LA20JG 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, designs high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.

The IDT71342 family was engineered specifically for deterministic interprocessor communication in real-time embedded systems - emphasizing hardware-accelerated resource arbitration, low-latency memory access, and robust operation under industrial environmental stress.

FAQ

What is the maximum clock frequency supported by IDT71342LA20JG for synchronous interface designs?

IDT71342LA20JG does not include an internal clock; it is an asynchronous SRAM. Its 20 ns access time supports maximum bus toggle rates up to 50 MHz in systems with zero wait-state controllers. For synchronous interfaces, designers must derive timing margins from tRC (20 ns), tAA (20 ns), and tWP (15 ns) - ensuring setup/hold compliance with external clock edges. IDT71342LA20JG requires no clock input and operates purely on control signal transitions.

Does IDT71342LA20JG support true simultaneous read/write between left and right ports?

Yes - IDT71342LA20JG supports true concurrent access: the left port can read while the right port writes (or vice versa) to different addresses without timing penalty. However, simultaneous access to the same memory location causes undefined data; semaphore logic must be used to coordinate such cases. The 20 ns access time applies independently to each port, confirmed in Functional Block Diagram and Truth Table I.

How is data retention enabled and verified in IDT71342LA20JG?

Data retention in IDT71342LA20JG activates automatically when VCC drops to ≤2.0 V while CE and SEM remain high - entering ISB3 mode with ≤1500 µA current draw. Retention is verified per Table 7: VDR = 2.0 V (typ), ICCDR = 100 µA (typ). No external circuitry is needed; the LA variant's design guarantees content integrity during brownout, unlike SA versions which lack this feature.

Can IDT71342LA20JG semaphore flags be accessed by both ports simultaneously?

No - semaphore access is mutually exclusive. When SEM = VIL, only one port may assert its CE while the other must hold CE = VIH. Truth Table II and Figure 13 confirm that simultaneous semaphore writes from both sides result in deterministic arbitration: the first valid write wins, and the losing side's request is latched but not committed until the winning side releases the flag. This prevents corruption and ensures atomicity.

What package options are available for IDT71342LA20JG, and is the PLCC version RoHS-compliant?

IDT71342LA20JG is specified in 52-pin PLCC (PLG52) per Pin Configuration diagram on page 2. The JG suffix denotes PLCC packaging. Per IDT documentation and Renesas compliance reports, PLG52 packages manufactured after 2006 are lead-free and RoHS-compliant. The body dimensions (20.0 mm × 20.0 mm × 4.3 mm) and thermal characteristics match industrial reflow profiles - no special assembly requirements beyond standard Pb-free guidelines apply to IDT71342LA20JG.