Renesas 71342LA20PF8

Overview

IDT71342LA20PF8 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 (commercial grade), supporting independent asynchronous reads/writes on left and right ports, and enabling interprocessor resource arbitration in real-time embedded systems such as industrial motion controllers and telecom packet buffers.

For engineers reviewing the IDT71342LA20PF8 datasheet, IDT71342LA20PF8 pinout, IDT71342LA20PF8 application, or IDT71342LA20PF8 equivalent, this page delivers verified specifications, validated PLCC-52 pin mapping, confirmed battery-backed data retention at 2 V, industrial temperature support (–40°C to +85°C), and direct alternative part comparisons for dual-port SRAM selection.

Technical Context

The IDT71342LA20PF8 implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port-no shared timing constraints between left (L) and right (R) sides. Its dedicated 3-bit semaphore address space (A0–A2) enables hardware-assisted token passing via SEMR/SEML pins, with active-low flag semantics and automatic contention resolution.

It integrates CMOS-based power management: CE and SEM jointly control per-port standby modes, achieving 1 mW typical standby power; the LA variant supports 2 V data retention with ≤1500 µA ICCDR, while maintaining TTL-compatible 5 V ±10% operation and full 4K × 8 memory array access without arbitration overhead.

Key Specifications

Pinout & Package

Package: 52-pin Plastic Leaded Chip Carrier (PLCC), body size ≈ 20.0 mm × 20.0 mm × 4.3 mm, lead pitch 0.635 mm, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT71342LA20PF8, CY7C1354V25 offers modern 3.3 V efficiency but forfeits battery backup and industrial temp rating, while AS7C34098B cuts cost but shifts semaphore arbitration to software-introducing non-deterministic latency and validation burden.

Availability

IDT71342LA20PF8 is available at Aetrix Electronics and suitable for industrial motion control, telecom packet buffering, medical imaging subsystems, and avionics data recorders requiring stable component supply across extended product lifecycles.

Supply support for IDT71342LA20PF8 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 power solutions for high-performance computing and communications.

IDT71342LA20PF8 belongs to IDT's legacy dual-port SRAM product line, designed specifically for deterministic interprocessor communication in real-time embedded systems where hardware arbitration and low-latency memory sharing are critical.

FAQ

What is the maximum operating speed of the IDT71342LA20PF8?

The IDT71342LA20PF8 has a maximum access time of 20 ns (tAA), corresponding to a minimum read cycle time (tRC) of 20 ns. This enables reliable operation at up to 50 MHz effective throughput per port under commercial temperature conditions (0°C to +70°C). The device does not require an external clock-its fully asynchronous design supports variable-rate access patterns without timing constraints between ports.

Does the IDT71342LA20PF8 support battery backup, and what voltage is required?

Yes, the IDT71342LA20PF8 supports battery backup with guaranteed data retention down to 2.0 V (VDR), as specified in Table 7 of the datasheet. At VCC = 2 V and TA = +25°C, typical data retention current is 100 µA, with a maximum of 1500 µA. This feature is exclusive to the LA variant and enables nonvolatile state preservation during main power interruption in industrial and aerospace applications.

How do the semaphore flags function in the IDT71342LA20PF8?

The IDT71342LA20PF8 includes eight hardware semaphore flags accessed via A0–A2 when SEM = VIL. Each flag is active-low: writing '0' requests the token, writing '1' releases it. Flags are latched per port-only the side that first writes '0' gains write authority until it writes '1'. Reads return the flag state across all 8 data bits, and the output is latched to prevent mid-cycle changes during arbitration sequences.

What package type is used for the IDT71342LA20PF8?

IDT71342LA20PF8 uses a 52-pin Plastic Leaded Chip Carrier (PLCC) package, designated PLG52 in IDT documentation. It features a 20.0 mm × 20.0 mm body with 0.635 mm lead pitch and gull-wing leads. This through-hole-compatible surface-mount package provides mechanical robustness and thermal performance suited for industrial PCB assemblies subject to vibration and thermal cycling.

Can the left and right ports of the IDT71342LA20PF8 operate simultaneously without conflict?

Yes-the IDT71342LA20PF8 supports true simultaneous access: both ports can perform independent read or write operations at any time, including concurrent reads/writes to the same memory location. Conflicts are avoided by design-non-semaphore memory locations allow overlapping access, while semaphore flags include built-in hardware arbitration to resolve simultaneous token requests deterministically, ensuring one port always wins.