Renesas 7143LA25PFI

Overview

7143LA25PFI from IDT is a low-power, 2K × 16-bit (32 Kbit), dual-port static RAM designed as a SLAVE device in MASTER/SLAVE memory expansion systems. It supports independent asynchronous read/write access on left and right ports, features 25 ns max access time (industrial grade), 1 mW typical standby power, and 2 V data retention for battery backup operation. It is used in real-time embedded systems requiring concurrent CPU/DSP access to shared memory - such as radar signal processors and industrial motion controllers.

For engineers reviewing the 7143LA25PFI datasheet, 7143LA25PFI pinout, 7143LA25PFI application, or 7143LA25PFI equivalent, key selection considerations include its SLAVE-only BUSY input behavior, byte-level write control per port, industrial temperature range (–40°C to +85°C), and compatibility with IDT7133LA MASTER devices in 32-bit+ width expansions.

Technical Context

The 7143LA25PFI implements fully asynchronous dual-port architecture with separate address, control, and bidirectional I/O buses for left and right ports. Its BUSY pin functions exclusively as an input (unlike the MASTER IDT7133), enabling write inhibition during address contention without internal arbitration logic.

It uses CMOS high-performance technology with TTL-compatible signaling, single 5V ±10% supply, and automatic power-down via chip enable (CE). Each port supports independent byte-write enable (R/WLUB/R/WLLB and R/WRUB/R/WRLB) and output enable (OEL/OER), allowing granular 8-bit data manipulation without affecting adjacent bytes.

Key Specifications

Pinout & Package

7143LA25PFI is packaged in a 68-pin Plastic Leaded Chip Carrier (PLCC, code PLG68), with dual-row gull-wing leads and body dimensions approx. 0.95 in × 0.95 in × 0.17 in. Both VCC and GND pins must be connected to ensure reliable operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1371D-25BGXI and IDT7133LA25PFI, the 7143LA25PFI uniquely delivers SLAVE-specific BUSY input behavior that eliminates external arbitration components in width-expanded systems, while maintaining identical pinout and timing - enabling seamless integration into legacy IDT7133/7143-based designs.

Availability

7143LA25PFI is available at Aetrix Electronics and suitable for radar signal processing, digital motion control, avionics display systems, and industrial PLC I/O mapping requiring stable component supply across extended product lifecycles.

Supply support for 7143LA25PFI 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 fabless semiconductor company specializing in timing, memory interface, RF, and sensor solutions, now part of Renesas Electronics.

The IDT7133/7143 family was engineered for real-time embedded systems demanding deterministic, contention-free dual-processor memory access - particularly in defense, aerospace, and industrial automation.

FAQ

What is the primary functional distinction between 7143LA25PFI and IDT7133LA25PFI?

The 7143LA25PFI is a SLAVE-only dual-port SRAM with BUSY pins configured as inputs for write inhibition, while the IDT7133LA25PFI is a MASTER device containing on-chip arbitration logic and open-drain BUSY outputs. They share identical pinouts and timing but are not interchangeable - using 7143LA25PFI in a MASTER role will disable hardware arbitration. The 7143LA25PFI must be paired with a 7133LA25PFI to implement full MASTER/SLAVE width expansion.

Does 7143LA25PFI support battery backup operation, and what are the conditions?

Yes, the 7143LA25PFI supports battery backup with guaranteed data retention at VCC = 2.0 V (min.), consuming ≤ 4000 µA in industrial temperature range. This mode activates automatically when main supply drops below 2.0 V while CE remains high; all I/O and address lines must be held static or at valid logic levels (VIL < 0.8 V or VIH > 2.2 V) to prevent corruption. No external circuitry is required beyond the backup battery and decoupling.

Can 7143LA25PFI operate in standalone mode without a MASTER device?

Yes, the 7143LA25PFI can operate as a standalone dual-port SRAM without a MASTER. In this configuration, BUSYL and BUSYR must be tied HIGH (via pull-up resistors) to disable write inhibition, enabling full concurrent access. However, simultaneous writes to the same address from both ports will result in undefined data - software or external logic must manage contention. The SLAVE topology is optional, not mandatory.

What is the significance of the 'PFI' suffix in 7143LA25PFI?

The 'PFI' suffix denotes the package and temperature grade: 'P' = PLCC (Plastic Leaded Chip Carrier), 'F' = industrial temperature range (–40°C to +85°C), and 'I' = lead-free (RoHS-compliant) finish. This confirms the device is supplied in 68-pin PLCC packaging, qualified for industrial environments, and compliant with modern environmental regulations - distinguishing it from military (e.g., 'M') or commercial ('C') variants.

How does byte-write enable functionality work on 7143LA25PFI, and why is it valuable?

The 7143LA25PFI provides separate upper-byte (R/WLUB/R/WRUB) and lower-byte (R/WLLB/R/WRLB) write enables per port, allowing independent 8-bit writes to I/O0–I/O7 or I/O8–I/O15 without affecting the other byte. This enables atomic updates in mixed-precision systems - for example, updating a 16-bit counter's low byte while preserving the high byte during interrupt service. It eliminates read-modify-write cycles, reducing latency and bus traffic in real-time control loops.