Renesas 7143SA20J

Overview

7143SA20J from IDT is a high-speed 2K × 16 dual-port static RAM configured as a SLAVE device in MASTER/SLAVE memory expansion systems, supporting independent asynchronous read/write access on left and right ports with 20 ns maximum read cycle time (commercial grade), 5 V ±10% supply, and TTL-compatible I/O. It enables error-free 32-bit-or-wider word-width memory systems without external logic.

For engineers reviewing the 7143SA20J datasheet, 7143SA20J pinout, 7143SA20J application, or 7143SA20J equivalent, this page delivers verified timing specs, BUSY-input arbitration behavior, byte-select write control, power-down modes, and direct replacement guidance for industrial embedded memory subsystems.

Technical Context

The 7143SA20J operates as a SLAVE dual-port SRAM with BUSY input (not output), requiring external BUSY signal from a MASTER IDT7133 to gate write operations during address contention. It lacks on-chip arbitration logic - all port-to-port conflict resolution is delegated to the MASTER device.

It supports fully asynchronous operation per port, separate upper/lower byte write enables (R/WLUB/R/WLLB and R/WRUB/R/WRLB), and automatic power-down via chip enable (CEL/CER). Data retention at 2 V is supported only in LA variants; the SA variant (like 7143SA20J) does not provide battery backup retention.

Key Specifications

Pinout & Package

7143SA20J is packaged in a 68-pin PLCC (PLG68), with identical pinout to IDT7133/7143 family devices. Both VCC pins must be connected to 5 V; both GND pins must be tied to ground for reliable operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT7143SA25J and CY7C1362AV25, the 7143SA20J delivers the fastest commercially rated access (20 ns) in a pin-compatible 5 V TTL package with dedicated SLAVE BUSY-input behavior - critical for legacy or high-throughput width-expanded systems.

Availability

7143SA20J is available at Aetrix Electronics and suitable for real-time signal processing, dual-CPU shared memory, video frame buffering, and communications protocol engine applications requiring stable component supply and long-term industrial memory continuity.

Supply support for 7143SA20J 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

IDT (Integrated Device Technology) is a semiconductor company specializing in timing, memory interface, RF, and high-performance silicon solutions, now part of Renesas Electronics.

The IDT7143 product line delivers SLAVE-configured dual-port SRAMs designed specifically for width-expansion architectures with MASTER/SLAVE arbitration - enabling scalable, high-reliability memory subsystems in aerospace, test equipment, and industrial control.

FAQ

What is the key functional difference between 7143SA20J and IDT7133SA20J?

The 7143SA20J is a SLAVE dual-port SRAM with BUSY input only, while IDT7133SA20J is the MASTER device featuring BUSY output and on-chip arbitration logic. In a width-expanded system, 7143SA20J relies entirely on the MASTER's BUSY signal to inhibit writes during contention - it contains no internal arbitration circuitry. This division of responsibility prevents "busy lock-out" and simplifies multi-chip synchronization. The 7143SA20J shares identical pinout and timing with IDT7133SA20J but cannot operate standalone as a MASTER.

Does 7143SA20J support battery backup data retention?

No, the 7143SA20J does not support battery backup data retention. That capability is exclusive to LA variants (e.g., IDT7143LA20J), which specify 2 V data retention voltage and ultra-low standby current (~100 µA typ). The "SA" suffix denotes standard power consumption (1150 mW active typ), and its ISB3 full-standby current is 15 mA max - incompatible with long-term battery-backed operation. For retention-critical applications, the LA variant must be selected instead.

Can 7143SA20J be used without a MASTER device?

Yes, 7143SA20J can operate as a stand-alone dual-port SRAM without a MASTER, but BUSY arbitration is disabled. To do so, tie both BUSYL and BUSYR inputs HIGH (via pull-up resistors), allowing unrestricted concurrent access. However, if both ports attempt writes to the same address simultaneously, data corruption may occur - software or external logic must then manage contention. The SLAVE architecture is optimized for coordinated use with IDT7133; standalone use forfeits hardware arbitration benefits.

What package type is used for 7143SA20J, and are there alternatives?

The 7143SA20J is supplied in a 68-pin PLCC (PLG68) package, with body dimensions approximately 0.95 in × 0.95 in × 0.17 in. IDT also offers the same device in 68-pin ceramic PGA (GU68), 68-pin flatpack (FP68), and 100-pin TQFP (PNG100). All variants share identical pin functions and timing, but mechanical fit, thermal performance, and soldering process differ. The PLCC version is preferred for through-hole prototyping and rework-friendly designs, while TQFP suits high-density surface-mount layouts.

Is 7143SA20J compliant with RoHS and green manufacturing standards?

Yes, 7143SA20J is a green part compliant with RoHS directives, as confirmed in the official IDT documentation. It contains no lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls (PBB), or polybrominated diphenyl ethers (PBDE). The "green" designation applies to both packaging materials and assembly processes, ensuring environmental compliance for export and industrial deployment without requiring exemptions or special handling.