Renesas 71342LA25JGI

Overview

IDT71342LA25JGI from Integrated Device Technology is a high-speed 4K × 8 dual-port static RAM with on-chip semaphore logic, operating at 25 ns (max) access time over –40°C to +85°C, consuming 700 mW active power and 1 mW standby power, and supporting battery-backed data retention down to 2 V - used in real-time interprocessor communication systems requiring concurrent memory access without arbitration wait states.

For engineers reviewing the IDT71342LA25JGI datasheet, IDT71342LA25JGI pinout, IDT71342LA25JGI application, or IDT71342LA25JGI equivalent, this device delivers deterministic port-to-port synchronization, TTL-compatible 5 V operation, industrial-temperature reliability, and hardware-managed semaphore flag arbitration for shared resource control in embedded multiprocessor designs.

Technical Context

The IDT71342LA25JGI implements two fully asynchronous ports (left/right), each with independent address (A0–A11), data (I/O0–I/O7), and control lines (CE, OE, R/W), enabling simultaneous read/write operations to non-semaphore memory locations. Its dedicated semaphore block uses eight independent latches accessed via A0–A2 under SEM = VIL, with active-low token semantics and automatic contention resolution.

It features automatic power-down controlled by CE and SEM pins: both HIGH places the port in full standby (ISB3 ≤ 4.0 mA), while CMOS-level input thresholds enable ultra-low current retention (ICCDR ≤ 1500 µA at VCC = 2 V). Fabricated in CMOS, it requires no external arbitration logic and supports true concurrent access without bus locking or software polling overhead.

Key Specifications

Pinout & Package

Package: 52-pin PLCC (PLG52), body size ≈ 20.0 mm × 20.0 mm × 4.3 mm, 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 CY7C1354V25 and AS7C34098B, the IDT71342LA25JGI uniquely combines 5 V TTL compatibility, industrial temperature rating, hardware semaphore arbitration, and 2 V battery retention - making it the sole option for deterministic, low-power, fail-safe interprocessor memory sharing in legacy 5 V embedded systems.

Availability

IDT71342LA25JGI is available at Aetrix Electronics and suitable for industrial motion control, telecom line card buffering, avionics data concentrators, medical imaging subsystems, and real-time test equipment requiring stable component supply across extended product lifecycles.

Supply support for IDT71342LA25JGI 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 sensor signal conditioning ICs for high-performance computing and communications.

IDT71342LA25JGI belongs to IDT's legacy dual-port SRAM product line, designed specifically for deterministic interprocessor communication in real-time embedded systems where hardware semaphore arbitration eliminates software-induced latency and race conditions.

FAQ

What is the maximum guaranteed access time for IDT71342LA25JGI?

The IDT71342LA25JGI has a maximum access time (tAA) of 25 ns across the full industrial temperature range (–40°C to +85°C) and 5.0 V ±10% supply. This value is production-tested and guaranteed per the datasheet Table 09a, ensuring deterministic timing for real-time interprocessor handshaking without derating.

Does IDT71342LA25JGI support battery backup operation?

Yes, IDT71342LA25JGI supports battery backup data retention down to 2.0 V (VDR), with typical retention current (ICCDR) of 100 µA and maximum of 1500 µA at TA = +25°C. This feature is exclusive to LA-grade parts and enables nonvolatile state preservation during main power loss - confirmed in datasheet Table 07.

How many semaphore flags does IDT71342LA25JGI provide, and how are they accessed?

IDT71342LA25JGI provides eight independent hardware semaphore flags, accessed exclusively via A0–A2 address lines when SEM = VIL. Only I/O0 is used for writing; reads return the flag state across all eight I/O lines. This dedicated address space is electrically isolated from the main 4K × 8 memory array, as detailed in the Functional Description section (page 11).

What package type is used for IDT71342LA25JGI?

IDT71342LA25JGI is packaged in a 52-pin PLCC (PLG52) with dimensions approximately 20.0 mm × 20.0 mm × 4.3 mm. Pin configuration matches the top-view diagram in Figure 2 of the datasheet (DSC 2621/16), and the "JGI" suffix explicitly denotes this industrial-grade PLCC variant.

Can both ports of IDT71342LA25JGI perform simultaneous read/write operations?

Yes - IDT71342LA25JGI supports fully asynchronous concurrent access: one port may read while the other writes to non-semaphore memory locations. Simultaneous writes to the same address are undefined, but semaphore flags are protected against contention, and the device resolves simultaneous token requests deterministically per Truth Table II and Timing Waveform 13.