Renesas 7143LA25PF

Overview

7143LA25PF from IDT is a low-power 2K × 16-bit 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 25ns max read cycle time, TTL-compatible 5V ±10% operation, and industrial temperature range (–40°C to +85°C), used in real-time embedded controllers requiring concurrent CPU/DSP memory access.

For engineers reviewing the 7143LA25PF datasheet, 7143LA25PF pinout, 7143LA25PF application, or 7143LA25PF equivalent, this page delivers verified timing parameters, BUSY-input arbitration behavior, byte-select write control, battery backup data retention at 2V, and exact 68-pin PLCC package mapping - all critical for deterministic dual-processor memory coherency design.

Technical Context

The 7143LA25PF operates as a SLAVE dual-port SRAM with BUSY input (not output), enabling hardware arbitration when paired with IDT7133 MASTER devices. It supports fully asynchronous port access, separate upper/lower byte write enables (R/WLUB/R/WLLB and R/WRUB/R/WRLB), and automatic power-down via chip enable (CEL/CER).

Unlike the MASTER IDT7133, the 7143LA25PF lacks on-chip arbitration logic and BUSY output; its BUSY pins (BUSYL/BUSYR) are dedicated inputs that gate write operations during contention. Data retention at 2V is supported with typical ICCDR = 100µA (industrial grade).

Key Specifications

Pinout & Package

7143LA25PF is packaged in a 68-pin Plastic Leaded Chip Carrier (PLCC), with dual I/O ports, independent address/control lines per port, and BUSY pins configured exclusively as inputs - consistent across all IDT7143 variants.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362V-25AXI and IDT7133LA25PF, the 7143LA25PF uniquely delivers SLAVE-specific BUSY input behavior and pin-for-pin compatibility within IDT's MASTER/SLAVE ecosystem - essential for maintaining deterministic arbitration without layout changes.

Availability

7143LA25PF is available at Aetrix Electronics and suitable for industrial motor control, avionics data acquisition, and programmable logic controller applications requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.

Supply support for 7143LA25PF 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 high-performance memory, timing, and interface solutions for communications, computing, and industrial markets.

The IDT7143 product line delivers SLAVE dual-port SRAMs optimized for seamless width expansion with IDT7133 MASTER devices, targeting real-time embedded systems demanding concurrent, contention-free memory access.

FAQ

What is the function of BUSYL and BUSYR on the 7143LA25PF?

On the 7143LA25PF, BUSYL and BUSYR are dedicated input pins - not outputs - used to receive BUSY signals from a MASTER IDT7133 device. When asserted low, they inhibit write operations on the corresponding port. For normal operation, both pins must be tied high; pulling either low blocks writes to that port entirely. This behavior is fundamental to the SLAVE role and differs from the MASTER's open-drain BUSY outputs.

Can the 7143LA25PF operate as a standalone dual-port RAM without a MASTER device?

Yes, the 7143LA25PF can operate standalone: BUSYL and BUSYR must be externally tied high to disable write inhibition, enabling full read/write functionality on both ports. All control, address, and I/O signals remain fully functional. However, hardware arbitration during simultaneous same-address access is unavailable - software coordination or external logic is required in such cases.

What is the maximum clock frequency supported by the 7143LA25PF?

The 7143LA25PF is an asynchronous SRAM - it has no internal clock. Its speed is defined by timing parameters like tRC (25ns max), which corresponds to a maximum effective throughput of ~40 million accesses per second. System timing depends on external controller setup/hold times relative to CE, OE, and R/W transitions - not a clock signal.

Does the 7143LA25PF support battery backup, and what voltage is required?

Yes, the 7143LA25PF supports battery backup with guaranteed data retention down to VCC = 2.0V. At this voltage, typical data retention current (ICCDR) is 100µA under industrial conditions. The device maintains stored data indefinitely as long as VCC remains ≥2.0V, making it suitable for black-box logging and safe-shutdown contexts.

Is the 7143LA25PF pin-compatible with the 7143SA25PF?

Yes, the 7143LA25PF and 7143SA25PF share identical pinouts, package (68-pin PLCC), and AC/DC specifications - differing only in power consumption: LA version draws 1050mW active (vs. 1150mW for SA) and 1mW standby (vs. 5mW). Both operate across the same industrial temperature range and support identical timing and interface protocols.