Renesas 7143SA55PF8

Overview

7143SA55PF8 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 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 bus width expansion without external logic in real-time embedded control and military avionics.

For engineers reviewing the 7143SA55PF8 datasheet, 7143SA55PF8 pinout, 7143SA55PF8 application, or 7143SA55PF8 equivalent, this page delivers verified electrical specs, BUSY-input arbitration behavior, byte-selectable write control per port, 68-pin PLCC package mapping, and direct alternatives for dual-port SRAM system design.

Technical Context

The 7143SA55PF8 operates as a SLAVE in MASTER/SLAVE dual-port configurations: its BUSY pin functions exclusively as an input to receive arbitration signals from a companion IDT7133 MASTER, enabling coordinated write inhibition during address contention. It lacks on-chip arbitration logic - all BUSY-driven arbitration is externally managed via the MASTER's open-drain BUSY output.

It supports fully asynchronous dual-port operation with separate CE, R/W, OE, and address buses per port, allowing concurrent reads/writes to distinct memory locations. Byte-level write enable (R/WLUB/R/WLLB and R/WRUB/R/WRLB) permits independent upper/lower 8-bit writes without masking logic.

Key Specifications

Pinout & Package

7143SA55PF8 is packaged in a 68-pin PLCC (Plastic Leaded Chip Carrier), body size ≈ 0.95 in × 0.95 in × 0.17 in, with dual-row gull-wing leads. 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 IDT7143SA55PGI, the 7143SA55PF8 offers lower-cost PLCC assembly and industrial temp suitability; compared with CY7C1362AV25, it preserves legacy IDT MASTER/SLAVE timing compatibility but requires a companion 7133 for arbitration.

Availability

7143SA55PF8 is available at Aetrix Electronics and suitable for real-time motion control, military avionics data buffering, and industrial PLC I/O mapping requiring stable component supply, long-term obsolescence management, and traceable sourcing.

Supply support for 7143SA55PF8 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 IDT7143 product line delivers SLAVE-configured dual-port SRAMs designed specifically for width-expansion architectures with external arbitration, targeting high-reliability embedded systems where deterministic memory access and bus coherency are critical.

FAQ

What is the role of BUSY pins on the 7143SA55PF8?

The BUSY pins (BUSYL and BUSYR) on the 7143SA55PF8 function exclusively as inputs - unlike the MASTER IDT7133, this SLAVE device does not generate BUSY signals. When asserted low by a connected IDT7133 MASTER, they internally gate write operations to prevent data corruption during address contention. Pulling either BUSY pin low disables writes to that port entirely, enabling software-controlled port blocking.

Can the 7143SA55PF8 operate as a standalone dual-port RAM without a MASTER device?

Yes, the 7143SA55PF8 can operate independently as a dual-port SRAM without a MASTER, but BUSY arbitration is disabled. In standalone mode, both ports access memory concurrently with no hardware conflict resolution - designers must implement external arbitration or ensure non-overlapping address access in firmware. The device retains full 2K × 16 capacity and 55 ns timing in this configuration.

What is the difference between 7143SA55PF8 and 7143LA55PF8?

The 7143SA55PF8 uses standard CMOS process with typical active current of 230 mA and no data retention capability below 4.5 V. The 7143LA55PF8 is the low-power variant: it draws only 100 µA in full standby (CMOS inputs) and supports 2 V data retention for battery backup applications - confirmed in datasheet Table 8. Both share identical pinout, timing, and SLAVE functionality.

Does the 7143SA55PF8 support byte write masking without external logic?

Yes, the 7143SA55PF8 provides native byte write masking via four dedicated control signals: R/WLUB and R/WLLB for the left port, R/WRUB and R/WRLB for the right port. Each enables or disables write operations to its respective 8-bit half of the 16-bit data bus - eliminating the need for external AND gates or read-modify-write sequences when updating individual bytes.

Is the 7143SA55PF8 pin-compatible with other IDT7143 speed grades?

Yes, all IDT7143SA variants - including 7143SA20, 7143SA25, 7143SA35, 7143SA45, 7143SA55, 7143SA70, and 7143SA90 - share identical 68-pin PLCC pinout, electrical interface, and functional behavior. Only access timing parameters differ; PCB layout and firmware remain unchanged across speed grades, enabling performance tuning via component swap.