Renesas 71342LA20PFG8

Overview

IDT71342LA20PFG8 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 IDT71342LA20PFG8 datasheet, IDT71342LA20PFG8 pinout, IDT71342LA20PFG8 application, or IDT71342LA20PFG8 equivalent, this device is selected for deterministic inter-processor communication, battery-backed data retention (2 V), low-power standby (1 mW typ.), and hardware semaphore coherency in dual-CPU architectures requiring zero-wait-state memory sharing.

Technical Context

The IDT71342LA20PFG8 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 pin assertion. Each port features separate CE, OE, R/W, and address/control lines enabling true concurrent operation without timing coupling.

Semaphore logic implements token-passing arbitration: writing '0' to a flag grants exclusive write access to that side; reading returns latched state across all I/O bits; contention resolution is guaranteed even on simultaneous requests. Power management uses CE/SEM-controlled automatic entry into full standby (ISB3 = 0.2 mA typ.) when both ports are deselected.

Key Specifications

Pinout & Package

64-pin TQFP (PNG64) package with 0.5 mm pitch; body dimensions 14 mm × 14 mm × 1.4 mm; thermal pad exposed on underside for enhanced heat dissipation in high-density layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1352BV25AC and IS61LV5128AL-20TQLI, the IDT71342LA20PFG8 uniquely delivers 5 V TTL compatibility, integrated hardware semaphores, and 2 V battery-backed retention-making it irreplaceable in legacy industrial controllers and safety-critical dual-processor systems where deterministic arbitration and power-loss resilience are mandatory.

Availability

IDT71342LA20PFG8 is available at Aetrix Electronics and suitable for industrial PLCs, automotive ADAS hubs, medical imaging buffers, and avionics flight control systems requiring stable component supply across extended product lifecycles.

Supply support for IDT71342LA20PFG8 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 high-performance computing solutions.

The IDT71342LA20PFG8 belongs to IDT's dual-port SRAM product line, engineered specifically for deterministic interprocessor communication in real-time embedded systems requiring hardware-enforced memory coherency and zero-wait-state performance.

FAQ

What is the maximum access time specification for the IDT71342LA20PFG8?

The IDT71342LA20PFG8 has a maximum read cycle time (tRC) of 20 ns and maximum address access time (tAA) of 20 ns under commercial conditions. These values are guaranteed across the full industrial temperature range (–40°C to +85°C) and 5 V ±10% supply, enabling direct interfacing with high-speed microcontrollers without wait-state insertion. The '20' in the part number explicitly denotes this 20 ns speed grade.

Does the IDT71342LA20PFG8 support battery backup operation?

Yes, the IDT71342LA20PFG8 supports battery backup data retention at 2 V minimum supply voltage, drawing ≤1500 µA typical retention current. This feature is exclusive to the 'LA' variant (low-power, battery-retentive) and is confirmed in the Data Retention Characteristics table (Table 07) of the official datasheet. The 'SA' variant does not support this function.

How many semaphore flags does the IDT71342LA20PFG8 provide, and how are they accessed?

The IDT71342LA20PFG8 provides eight independent binary semaphore flags, accessed exclusively via the SEM pin (active-low) and address lines A0–A2. When SEM is asserted, the device maps the 3-bit address space to the semaphore register bank instead of the main 4K × 8 SRAM array. Only I/O0 is used for writing semaphore values; reads return the flag state across all eight I/O pins.

What is the package type and pin count of the IDT71342LA20PFG8?

The IDT71342LA20PFG8 is packaged in a 64-pin TQFP (Thin Quad Flat Package) with designation PNG64. Its body measures 14 mm × 14 mm × 1.4 mm, and it features a thermally enhanced exposed pad. This differs from the 52-pin PLCC variant (PLG52) offered in the same family but not applicable to the PFG8 suffix.

Can both ports of the IDT71342LA20PFG8 operate simultaneously without conflict?

Yes, both ports of the IDT71342LA20PFG8 operate fully asynchronously and independently-reads and writes may occur concurrently on left and right ports. Conflicts are only possible during simultaneous writes to the same memory location or overlapping read/write to non-semaphore addresses. Semaphore flags are hardware-protected against such contention, ensuring deterministic ownership resolution even on simultaneous requests.