Renesas 71342SA20J8

Overview

IDT71342SA20J8 from Integrated Device Technology is a high-speed 4K × 8 dual-port static RAM with on-chip semaphore logic, operating at ≤20 ns access time (commercial grade), 5 V ±10% supply, and supporting fully asynchronous independent read/write access from left and right ports. It enables real-time interprocessor communication in tightly coupled dual-CPU systems such as industrial motion controllers and telecom line cards.

For engineers reviewing the IDT71342SA20J8 datasheet, IDT71342SA20J8 pinout, IDT71342SA20J8 application, or IDT71342SA20J8 equivalent, this page delivers verified specifications, validated PLCC-52 pin mapping, confirmed semiconductor-grade timing behavior, and two rigorously cross-referenced alternative parts for dual-port SRAM selection.

Technical Context

The IDT71342SA20J8 implements a true dual-port architecture with physically separate address, data, and control buses per port - no internal arbitration delay. Its semaphore block consists of eight dedicated, hardware-managed latches accessible via A0–A2 under SEM = VIL, with active-low token semantics and automatic contention resolution.

Each port supports independent TTL-compatible 5 V operation, full standby power-down (ISB3 = 1.0 mA typ.), and simultaneous read/write to non-semaphore memory locations. The device uses CMOS process technology and requires no external clock or synchronization logic.

Key Specifications

Pinout & Package

Package: 52-pin Plastic Leaded Chip Carrier (PLCC), body size ≈ 20.0 mm × 20.0 mm × 4.3 mm (0.79" × 0.79" × 0.17"). All VCC pins must be connected to 5 V supply; all GND pins must be tied to ground.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1342BV25JC and AS7C34098B-20JC, the IDT71342SA20J8 uniquely delivers 20 ns access in PLCC-52 with embedded hardware semaphores - eliminating layout changes and external logic while preserving commercial-grade speed and package compatibility.

Availability

IDT71342SA20J8 is available at Aetrix Electronics and suitable for industrial motion controllers, telecom line cards, medical imaging subsystems, avionics display processors, and test equipment requiring stable component supply across multi-year production cycles.

Supply support for IDT71342SA20J8 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.

IDT71342SA20J8 belongs to IDT's dual-port SRAM product line, engineered specifically for deterministic, low-latency interprocessor communication in real-time embedded systems where hardware semaphore coherency is critical.

FAQ

What is the maximum guaranteed access time for IDT71342SA20J8?

IDT71342SA20J8 has a maximum guaranteed address access time (tAA) of 20 ns under commercial temperature conditions (0°C to +70°C) and VCC = 5.0 V ±10%. This value is production-tested and applies to both left and right ports during asynchronous operation. The 20 ns specification ensures deterministic timing for systems targeting ≥50 MHz effective dual-port bandwidth without wait-state insertion.

Does IDT71342SA20J8 support battery backup operation?

No, IDT71342SA20J8 does not support battery backup operation. Only the LA variant (e.g., IDT71342LA20J8) provides 2 V data retention capability. The SA suffix denotes standard power consumption and excludes the low-voltage retention circuitry; its ISB3 standby current is 1.0 mA typical at 5 V, not µA-range retention current.

How many semaphore flags does IDT71342SA20J8 provide, and how are they accessed?

IDT71342SA20J8 provides eight hardware semaphore flags, each accessible via A0–A2 address lines when SEM is asserted low. Only I/O0 is used for writing semaphore values (0 = request token, 1 = release), and all I/O pins reflect the flag state during reads. Semaphore access requires CE = VIH and SEM = VIL - distinct from RAM access which uses SEM = VIH.

What package type is used for IDT71342SA20J8?

IDT71342SA20J8 is packaged in a 52-pin Plastic Leaded Chip Carrier (PLCC), designated PLG52. The package measures approximately 20.0 mm × 20.0 mm × 4.3 mm and features gull-wing leads compatible with standard reflow soldering processes. Pin 1 is marked by a corner notch; mechanical drawings confirm N/C on pins 1, 46, and 52.

Can both ports of IDT71342SA20J8 perform simultaneous read/write operations?

Yes - IDT71342SA20J8 supports fully asynchronous simultaneous read/write operations on left and right ports to non-semaphore memory locations. Conflicts are possible only during concurrent writes to the same address or mixed READ/WRITE to identical locations; semaphore flags are protected against such ambiguity by dedicated hardware logic that enforces exclusive write access per flag.