Renesas 7143SA55PF

Overview

7143SA55PF from IDT (Integrated Device Technology) is a high-speed 2K × 16 dual-port static RAM configured as a SLAVE device in MASTER/SLAVE memory expansion systems, supporting asynchronous independent read/write access on left and right ports with 55 ns maximum read cycle time, TTL-compatible 5V ±10% operation, and industrial temperature range (–40°C to +85°C). It enables 32-bit-or-wider word-width memory systems without external arbitration logic.

For engineers reviewing the 7143SA55PF datasheet, 7143SA55PF pinout, 7143SA55PF application, or 7143SA55PF equivalent, key selection considerations include its BUSY-input-only role (vs. MASTER's BUSY output), byte-selectable write control per port, 2V data retention capability, and compatibility with 68-pin PLCC packaging for embedded real-time control and military-grade avionics interfaces.

Technical Context

The 7143SA55PF implements fully asynchronous dual-port architecture with separate address, control, and bidirectional I/O buses for left and right ports - enabling concurrent access without internal synchronization overhead. Its BUSY pin functions exclusively as an input for write inhibition during address contention, unlike the IDT7133SA which provides open-drain BUSY output with on-chip arbitration logic.

It supports battery backup operation at VCC = 2V with typical data retention current of 100 µA (industrial grade), and features separate upper/lower byte write enables (R/WLUB/R/WLLB and R/WRUB/R/WRLB) for granular 8-bit writes. The device uses CMOS high-performance fabrication and requires no external components for MASTER/SLAVE width expansion.

Key Specifications

Pinout & Package

7143SA55PF is packaged in a 68-pin Plastic Leaded Chip Carrier (PLCC), with body dimensions approx. 1.18 in × 1.18 in × 0.16 in. Both VCC and GND pins must be connected for reliable operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT7143SA45PF, the 7143SA55PF offers tighter timing for higher-throughput interprocessor links; compared with CY7C1335KV18-55BZXI, it delivers plug-and-play BUSY-controlled arbitration without layout redesign or external gates - critical for rapid deployment in safety-critical systems.

Availability

7143SA55PF is available at Aetrix Electronics and suitable for real-time interprocessor communication, avionics flight control systems, and industrial PLC memory buffering requiring stable component supply across extended production lifecycles.

Supply support for 7143SA55PF 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 sensor solutions, acquired by Renesas Electronics in 2019.

The IDT7143SA family was designed specifically for MASTER/SLAVE dual-port SRAM expansion in high-reliability embedded systems where deterministic arbitration and seamless 32-bit+ data width scaling are required.

FAQ

What is the role of BUSY pins on the 7143SA55PF?

The BUSY pins (BUSYL and BUSYR) on the 7143SA55PF function exclusively as inputs - unlike the IDT7133SA MASTER, which drives them as open-drain outputs. When asserted HIGH by a connected MASTER device, they inhibit write operations on the corresponding port to prevent data corruption during address contention. This eliminates the need for external arbitration logic in width-expanded memory systems, and the 7143SA55PF must be used with a compatible MASTER such as IDT7133SA55PF to leverage this feature.

Does the 7143SA55PF support battery backup operation?

Yes, the 7143SA55PF supports battery backup operation down to VCC = 2.0 V, retaining stored data with typical current consumption of 100 µA under industrial conditions. This capability is inherent to the LA variant's low-power design; however, the "SA" suffix in 7143SA55PF indicates the standard-power version - confirming that data retention remains functional at 2V despite higher active current. No external circuitry is required beyond connecting a 2V backup source to the VCC pins.

Can the 7143SA55PF operate independently without a MASTER device?

Yes, the 7143SA55PF can operate as a standalone 2K × 16 dual-port SRAM without a MASTER device. In this configuration, BUSYL and BUSYR must be tied HIGH (e.g., via pull-up resistors) to disable write inhibition, enabling full concurrent read/write access on both ports. However, hardware arbitration during address contention is then unavailable - software coordination or external logic becomes necessary to avoid data corruption, making the 7143SA55PF most valuable when deployed with an IDT7133SA MASTER in width-expanded systems.

What package type does the 7143SA55PF use, and are there thermal considerations?

The 7143SA55PF uses a 68-pin Plastic Leaded Chip Carrier (PLCC) package with body dimensions approximately 1.18 in × 1.18 in × 0.16 in. It features two VCC and two GND pins - both must be connected to ensure reliable operation and minimize ground bounce. Thermal design requires attention to its 2.0 W absolute maximum power dissipation; at typical active current (230 mA @ 5V), power dissipation reaches ~1.15 W, necessitating adequate PCB copper area or airflow in enclosed industrial enclosures operating at +85°C ambient.

How does byte-write enable functionality work on the 7143SA55PF?

The 7143SA55PF provides separate upper- and lower-byte write enables for each port: R/WLUB and R/WLLB for the left port, R/WRUB and R/WRLB for the right port. When only one byte enable is asserted LOW (e.g., R/WLUB = LOW, R/WLLB = HIGH), only the corresponding 8-bit segment (I/O8L–I/O15L or I/O0L–I/O7L) is written; the other byte remains unchanged. This enables atomic 8-bit updates without read-modify-write sequences - critical for real-time systems updating status flags or control registers while preserving adjacent data in the same 16-bit word.