Renesas 7143SA25PF8

Overview

7143SA25PF8 from IDT is a 2K × 16-bit high-speed dual-port SRAM configured as a SLAVE device in MASTER/SLAVE memory expansion systems, supporting asynchronous read/write on independent left/right ports with 25 ns max access time (commercial & industrial temperature range), 5 V ±10% supply, and TTL-compatible I/O - used in real-time embedded controllers requiring concurrent CPU/DSP access to shared memory.

For engineers reviewing the 7143SA25PF8 datasheet, 7143SA25PF8 pinout, 7143SA25PF8 application, or 7143SA25PF8 equivalent, this page delivers verified timing parameters, BUSY-input arbitration behavior, byte-select write control, battery backup capability (2 V data retention), and package-specific layout guidance for 68-pin PLCC implementation.

Technical Context

The 7143SA25PF8 operates as a SLAVE dual-port RAM with BUSY input (not output), enabling hardware-controlled write inhibition during address contention in width-expanded systems. It lacks on-chip arbitration logic - that function resides solely in the MASTER IDT7133.

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 (CE) with TTL-level inputs. Data retention at 2 V is guaranteed for LA variants; SA versions retain data but are not characterized for low-Vcc retention.

Key Specifications

Pinout & Package

7143SA25PF8 is packaged in a 68-pin Plastic Leaded Chip Carrier (PLCC), body size ≈ 0.95 in × 0.95 in × 0.17 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 CY7C1362V-25AXC and IDT7133SA25PF8, the 7143SA25PF8 offers optimized SLAVE functionality for cost-sensitive, space-constrained industrial controllers where hardware arbitration offload and minimal external logic are critical - it does not support standalone operation or act as BUSY source.

Availability

7143SA25PF8 is available at Aetrix Electronics and suitable for industrial motion control, avionics data acquisition, and medical imaging front-end systems requiring stable component supply, long-term lifecycle support, and MIL-qualified traceability.

Supply support for 7143SA25PF8 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, and RF solutions, now part of Renesas Electronics since 2019.

The IDT7133/7143 family was designed for real-time embedded systems requiring deterministic, contention-free dual-processor memory sharing - targeting industrial automation, defense electronics, and medical instrumentation.

FAQ

Is 7143SA25PF8 a standalone dual-port RAM or does it require a companion device?

No, the 7143SA25PF8 is explicitly a SLAVE device and requires pairing with the IDT7133SA25PF8 MASTER for full BUSY arbitration functionality. It lacks on-chip arbitration logic and its BUSY pins are inputs only - attempting standalone use results in unmanaged write contention. The 7143SA25PF8 is intended exclusively for width-expanded memory systems where the MASTER handles arbitration.

What is the function of BUSYL and BUSYR on 7143SA25PF8?

On the 7143SA25PF8, BUSYL and BUSYR are dedicated input pins - not outputs. When asserted low by the MASTER IDT7133, they inhibit write operations on the corresponding left or right port. This prevents data corruption during simultaneous access to the same memory location. Pull-up resistors are not required on these pins, unlike the open-drain BUSY outputs on the MASTER.

Does 7143SA25PF8 support battery backup data retention like the LA version?

No - the "SA" suffix denotes standard power (not low-power) operation. While the 7143SA25PF8 retains data at 2 V per the IDT7143SA/LA family specification, it is not characterized or guaranteed for battery backup operation. Only LA variants (e.g., 7143LA25PF8) specify typical 100 µA data retention current and are tested for 2 V operation; SA versions prioritize speed and active power efficiency.

Can 7143SA25PF8 be used in place of IDT7133SA25PF8 in an existing design?

No - the 7143SA25PF8 is not a functional or pin-compatible replacement for the IDT7133SA25PF8. Their BUSY pin directions differ (input vs. open-drain output), arbitration logic is present only in the MASTER, and the 7133 includes additional control features like automatic power-up sequencing. Substituting them would cause system failure due to missing arbitration response and incorrect BUSY signaling.

What package type does 7143SA25PF8 use and are there thermal considerations?

The 7143SA25PF8 uses a 68-pin Plastic Leaded Chip Carrier (PLCC) package with body dimensions ≈ 0.95 in × 0.95 in × 0.17 in. It has two VCC and two GND pins - both must be connected to ensure proper current distribution and thermal dissipation. With typical active power dissipation of ~1.15 W (230 mA × 5 V), adequate PCB copper pour and airflow are recommended for continuous operation at +85°C ambient.