Renesas 7143LA55PF

Overview

7143LA55PF from IDT (Integrated Device Technology) is a low-power, 2K × 16-bit asynchronous dual-port SRAM designed as a SLAVE device in MASTER/SLAVE memory expansion configurations. It features 55 ns maximum read cycle time, 2V data retention capability, and operates across industrial temperature range (–40°C to +85°C) with single 5V ±10% supply. It enables error-free 32-bit-or-wider memory systems without external logic in telecom switching and real-time DSP buffering.

For engineers reviewing the 7143LA55PF datasheet, 7143LA55PF pinout, 7143LA55PF application, or 7143LA55PF equivalent, key selection criteria include BUSY input behavior (not output), byte-selectable write control per port, 1 µA typical standby current, and compatibility with IDT7133LA55PF as MASTER in width-expanded systems.

Technical Context

The 7143LA55PF implements fully asynchronous dual-port operation with independent left/right address, control, and I/O buses - no clock required. Its BUSY pin functions exclusively as a write-inhibit input (unlike the MASTER's open-drain BUSY output), enabling deterministic arbitration when paired with IDT7133LA55PF.

It supports separate upper/lower byte write enable (R/WLUB/R/WLLB and R/WRUB/R/WRLB), TTL-compatible signaling, and automatic power-down via chip enable (CE). The device uses CMOS high-performance fabrication for 1050 mW typical active power and 1 mW typical standby power at 5V.

Key Specifications

Pinout & Package

7143LA55PF is housed in a 68-pin Plastic Leaded Chip Carrier (PLCC, package code PLG68) with 0.05-inch lead pitch and body size ≈0.95″ × 0.95″ × 0.17″. 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 IDT7133LA55PF and CY7C133-55JC, the 7143LA55PF uniquely provides dedicated SLAVE BUSY input functionality for seamless integration into IDT's MASTER/SLAVE architecture - enabling scalable, lock-out-free memory expansion without added components or timing complexity.

Availability

7143LA55PF is available at Aetrix Electronics and suitable for telecom switching fabric, DSP real-time buffering, and industrial motion controller designs requiring stable component supply, long-term lifecycle support, and industrial temperature qualification.

Supply support for 7143LA55PF 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 optimized for width-expansion architectures - enabling robust, scalable memory subsystems in high-reliability communications and control systems.

FAQ

What is the role of BUSY pins on the 7143LA55PF?

The BUSYL and BUSYR pins on the 7143LA55PF function strictly as inputs - unlike the MASTER IDT7133, which drives BUSY as an open-drain output. When asserted LOW by a connected MASTER device, they inhibit write operations on the corresponding port. This design ensures deterministic arbitration in width-expanded systems without external logic. The 7143LA55PF itself does not generate BUSY signals.

Can the 7143LA55PF operate as a standalone dual-port SRAM without a MASTER device?

Yes, the 7143LA55PF can operate standalone: both ports support full asynchronous read/write with independent CE, R/W, and OE controls. BUSY pins default to inactive (must be pulled HIGH if unused) and do not affect basic operation. However, hardware arbitration during simultaneous same-address access requires external logic or software coordination - the 7143LA55PF alone does not resolve contention.

What is the significance of the 'LA' suffix in 7143LA55PF?

The 'LA' in 7143LA55PF denotes the low-power variant: it consumes 1050 mW typical active power and 1 mW typical standby current (ISB3), versus 1150 mW/5 mW for the SA version. Crucially, LA devices support 2V data retention - enabling battery backup operation - confirmed in datasheet Table 8 and Figure 5. This makes 7143LA55PF suitable for systems requiring nonvolatile memory holdover.

Which package does the 7143LA55PF use, and are there footprint alternatives?

The 7143LA55PF uses a 68-pin Plastic Leaded Chip Carrier (PLCC), designated PLG68 in IDT documentation. Pin-compatible variants exist in 68-pin ceramic PGA (GU68), 68-pin flatpack (FP68), and 100-pin TQFP (PNG100), but the PF suffix specifically indicates PLCC. Migration between packages requires PCB layout changes due to differing mechanical dimensions and thermal characteristics.

How does the 7143LA55PF handle simultaneous access to the same memory location from both ports?

The 7143LA55PF has no internal arbitration - it relies on external BUSY signaling from a MASTER device (e.g., IDT7133LA55PF) to prevent conflicting writes. If both ports attempt simultaneous writes to the same address without BUSY coordination, data corruption may occur. Read-read or read-write to same location is permitted, but write-write requires hardware arbitration via the BUSY input mechanism.