Renesas 7143SA35PF

Overview

7143SA35PF from IDT is a high-speed 2K × 16 dual-port static RAM configured as a SLAVE device in MASTER/SLAVE memory expansion systems, supporting 35 ns max read cycle time, TTL-compatible 5V ±10% operation, and industrial temperature range (–40°C to +85°C), used for real-time interprocessor communication in avionics data concentrators.

For engineers reviewing the 7143SA35PF datasheet, 7143SA35PF pinout, 7143SA35PF application, or 7143SA35PF equivalent, this page delivers verified timing parameters, BUSY-input arbitration behavior, byte-select write control, dual-port asynchronous access constraints, and package-specific layout guidance for 68-pin PLCC integration.

Technical Context

The 7143SA35PF implements fully asynchronous dual-port operation with independent left/right address, control, and I/O buses - enabling concurrent reads/writes to any memory location without internal synchronization. Its BUSY pin functions exclusively as an input (unlike the MASTER 7133), allowing external arbitration signals to gate write operations during contention.

It supports separate upper- and lower-byte write enables (R/WLUB/R/WLLB and R/WRUB/R/WRLB) per port, enabling partial-word writes without read-modify-write cycles. The device uses CMOS high-performance fabrication and includes automatic power-down via chip enable (CE/CER), achieving 1 mW typical standby power in LA variants - though the SA variant draws 5 mW typical standby.

Key Specifications

Pinout & Package

7143SA35PF is packaged in a 68-pin Plastic Leaded Chip Carrier (PLCC), with body dimensions approx. 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 CY7C133-35PC, 7143SA35PF eliminates external arbitration components and guarantees deterministic contention resolution; compared with IDT7133SA35PF, it provides slave-side write gating without arbitration overhead - making it indispensable for scalable, low-latency memory expansion.

Availability

7143SA35PF is available at Aetrix Electronics and suitable for avionics data concentrators, industrial PLC memory buffers, and military radar signal processors requiring stable component supply across extended production lifecycles.

Supply support for 7143SA35PF 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 semiconductor company specializing in high-performance memory, timing, and interface solutions for communications, computing, and industrial markets.

The IDT7143 product line delivers SLAVE-configured dual-port SRAMs designed specifically for width-expansion architectures - enabling seamless 32-bit and wider memory systems without external arbitration logic.

FAQ

What is the role of BUSY pins on the 7143SA35PF?

The BUSY pins (BUSYL and BUSYR) on the 7143SA35PF function exclusively as inputs - unlike the MASTER 7133, which drives them as open-drain outputs. When asserted LOW by a 7133 MASTER, they inhibit write operations on the corresponding port. This enables hardware-enforced arbitration in width-expanded systems without additional logic. The 7143SA35PF itself does not generate BUSY signals.

Can 7143SA35PF operate as a standalone dual-port RAM without a 7133 MASTER?

Yes, the 7143SA35PF can operate as a standalone dual-port RAM with fully independent left and right port access. BUSY inputs may be tied HIGH to disable write inhibition, enabling standard asynchronous operation. However, it lacks on-chip arbitration logic - so simultaneous writes to the same address from both ports will result in undefined data, unlike the 7133 MASTER which resolves contention.

What package type does 7143SA35PF use, and are all pins electrically identical to 7133SA35PF?

The 7143SA35PF uses a 68-pin PLCC (Plastic Leaded Chip Carrier) package, and shares identical pinout and electrical characteristics with the 7133SA35PF - including VCC (pins 17, 51), GND (pins 26, 35), and all address/data/control signals. This pin-for-pin compatibility simplifies PCB design when implementing MASTER/SLAVE pairs or field-replaceable configurations.

Does 7143SA35PF support battery backup data retention like the LA variants?

No - the "SA" suffix in 7143SA35PF denotes the standard-power version, not the low-power battery-retention variant. LA versions (e.g., 7143LA35PF) provide 2V data retention with ~100 µA typical retention current, while the SA variant requires continuous 5V supply for data integrity. Retention capability is not supported in the 7143SA35PF.

How does write timing differ between R/W-controlled and CE-controlled cycles on 7143SA35PF?

On the 7143SA35PF, R/W-controlled writes require the R/W signal to go LOW before CE, with write pulse width (tWP) ≥15 ns (for 35 ns grade). CE-controlled writes allow CE to initiate the cycle, requiring tEW ≥25 ns. In both cases, BUSY input must be sampled before write initiation, and tWH (write hold after BUSY) must be ≥25 ns to ensure contention resolution completes prior to data latching.