Renesas 7143LA35PF

Overview

7143LA35PF 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 access on left and right ports with 35ns max read cycle time, 2V data retention, and 1mW typical standby power. It enables error-free 32-bit-or-wider word-width memory systems without external logic in industrial embedded controllers.

For engineers reviewing the 7143LA35PF datasheet, 7143LA35PF pinout, 7143LA35PF application, or 7143LA35PF equivalent, this page delivers verified timing parameters (tRC = 35ns, tAOE = 20ns), BUSY input behavior, byte-select write control, battery backup capability, and package-specific pin validation for 68-pin PLCC (PF).

Technical Context

The 7143LA35PF operates as a SLAVE dual-port SRAM with BUSY pin functioning exclusively as a write-inhibit input - unlike the MASTER 7133LA which drives BUSY as an open-drain output. It lacks on-chip arbitration logic and relies entirely on external BUSY signaling from a MASTER device (e.g., 7133LA) to resolve port contention.

It supports fully asynchronous dual-port operation with separate CE, R/W, OE, address, and I/O lines per port, enabling concurrent reads/writes to distinct memory locations. Its low-power LA variant draws only 1mW typical standby current and retains data down to 2V supply, making it suitable for battery-backed industrial control modules.

Key Specifications

Pinout & Package

7143LA35PF is packaged in a 68-pin Plastic Leaded Chip Carrier (PLCC), designated by suffix "PF". The package is leaded, surface-mountable, and RoHS-compliant (green part). Pin 1 is marked with a notch or dot; body dimensions are approximately 24.13mm × 24.13mm × 3.3mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1335KV18-35BZXI and IDT7133LA35PF, the 7143LA35PF uniquely provides SLAVE-specific BUSY input behavior - essential for deterministic, hardware-arbitrated width expansion without added gates or firmware overhead.

Availability

7143LA35PF is available at Aetrix Electronics and suitable for industrial motion controllers, redundant communication nodes, and avionics data recorders requiring stable component supply across extended product lifecycles and temperature extremes.

Supply support for 7143LA35PF 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 power management ICs, now part of Renesas Electronics.

The 7143LA35PF belongs to IDT's legacy dual-port SRAM product line, engineered specifically for deterministic, low-latency inter-processor communication in industrial and aerospace systems using hardware-based BUSY arbitration.

FAQ

What is the role of BUSY pins on the 7143LA35PF?

The BUSY pins (BUSYL and BUSYR) on the 7143LA35PF serve exclusively as write-inhibit inputs - unlike the MASTER 7133LA, which drives them as open-drain outputs. When asserted low, they block write operations on the corresponding port. For normal operation, both BUSY pins must be tied HIGH via pull-up resistors. This SLAVE-specific behavior eliminates external arbitration logic in width-expanded memory systems.

Can the 7143LA35PF operate as a standalone dual-port RAM without a MASTER device?

Yes, the 7143LA35PF can operate as a standalone dual-port RAM, but BUSY arbitration must be disabled by tying both BUSYL and BUSYR pins HIGH. In this mode, it functions identically to the 7133LA except without on-chip arbitration logic - meaning simultaneous writes to the same address from both ports may cause data corruption. Use only in applications where software or system-level coordination prevents contention.

What does the "PF" suffix indicate in 7143LA35PF?

The "PF" suffix denotes the 68-pin Plastic Leaded Chip Carrier (PLCC) package. This surface-mount package features a J-lead contour, notch-marked pin 1, and dimensions of 24.13mm × 24.13mm × 3.3mm. It is RoHS-compliant and qualified for industrial temperature operation. The PF package is pin-compatible across the 7133/7143 family, enabling direct substitution in existing PLCC footprints.

How does the 7143LA35PF achieve 2V data retention?

The 7143LA35PF achieves 2V data retention through optimized CMOS cell design and reduced leakage pathways in its LA (low-power) variant. When VCC drops to 2.0V, internal circuitry enters a minimal-current retention mode (ICCDR ≤ 4000µA at MIL/IND temp), preserving stored data without refresh. This feature is validated per JEDEC JESD78 and supports battery-backup operation in systems with brown-out detection circuits.

Is the 7143LA35PF pin-compatible with the 7133LA35PF?

Yes, the 7143LA35PF is fully pin-compatible with the 7133LA35PF in the same package (e.g., PF), including identical pin count, location, and signal naming. However, functional differences exist: the 7133LA35PF drives BUSY as an output with internal arbitration logic, while the 7143LA35PF receives BUSY as an input and lacks arbitration. Swapping them requires updating BUSY routing and pull-up/pull-down configurations.