Renesas 7142LA35C

Overview

IDT7142LA35C from Integrated Device Technology (IDT) is a high-speed 2K × 8 dual-port static RAM configured as a slave device in master/slave memory expansion architectures. It supports independent asynchronous read/write access on left and right ports, features 35 ns maximum read cycle time, 1 µA full-standby current (ISB3), and battery-backed data retention at 2 V. It is used in real-time digital signal processing systems requiring concurrent CPU and DMA access to shared memory buffers.

For engineers reviewing the IDT7142LA35C datasheet, IDT7142LA35C pinout, IDT7142LA35C application, or IDT7142LA35C equivalent, key selection considerations include its BUSY input role (not output), 48-pin flatpack/LCC/DIP package compatibility, industrial temperature range (–40°C to +85°C), and strict timing requirements for port-to-port arbitration in width-expanded memory systems.

Technical Context

The IDT7142LA35C implements a true dual-port SRAM architecture with fully independent address, control, and I/O buses per port - enabling simultaneous, asynchronous access without internal arbitration logic. Unlike the IDT7132 master, it lacks on-chip arbitration and relies on external BUSY signaling from a companion IDT7132 to prevent write contention.

Its low-power LA variant uses CMOS technology to achieve 1 µA full-standby current (ISB3) and retains data at 2 V supply, making it suitable for battery-backed applications. The 35 ns speed grade specifies tRC ≤ 35 ns, tAA ≤ 35 ns, and tWC ≤ 35 ns under commercial conditions with 5.0 V ±10% supply.

Key Specifications

Pinout & Package

Available in 48-pin flatpack (FP48), LCC (LC48), and DIP (PDG48/SB48) packages. All variants share identical pin mapping and require connection of all VCC and GND pins per datasheet note.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1371D-35AC and IS61WV20488BLL-35TLI, the IDT7142LA35C uniquely delivers integrated hardware BUSY-based write arbitration and 2 V data retention - eliminating external logic while enabling robust, low-power shared-memory architectures.

Availability

IDT7142LA35C is available at Aetrix Electronics and suitable for real-time DSP buffering, industrial motion control, redundant communication controllers, battery-backed data logging, and other applications requiring stable component supply across extended product lifecycles.

Supply support for IDT7142LA35C 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

Integrated Device Technology (IDT) was a fabless semiconductor company specializing in timing, memory interface, RF, and sensor solutions before its acquisition by Renesas Electronics in 2019. Its dual-port SRAM portfolio emphasized high-reliability, low-latency memory for industrial and communications infrastructure.

The IDT7142LA35C belongs to IDT's legacy high-speed dual-port SRAM family designed specifically for width-expansion architectures requiring hardware-enforced write arbitration and battery-backed operation in harsh environments.

FAQ

What is the function of BUSYL and BUSYR on the IDT7142LA35C?

On the IDT7142LA35C, BUSYL and BUSYR are dedicated input pins - not outputs - that accept active-low BUSY signals from an IDT7132 master device. When asserted, they internally inhibit write operations on the corresponding port to prevent memory contention. This hardware arbitration eliminates the need for external logic or software coordination in width-expanded memory systems.

Does the IDT7142LA35C support true simultaneous read/write operations on both ports?

Yes, the IDT7142LA35C supports fully independent asynchronous read or write access on left and right ports. However, simultaneous writes to the same memory location trigger BUSY arbitration - the IDT7142LA35C relies on external BUSY inputs from an IDT7132 master to gate conflicting writes, ensuring deterministic behavior without data corruption.

What is the significance of the 'LA' suffix in IDT7142LA35C?

The 'LA' suffix in IDT7142LA35C denotes the low-power, battery-retentive variant of the IDT7142 family. It specifies 1 µA full-standby current (ISB3), 2 V data retention capability, and optimized CMOS design - distinguishing it from the higher-power 'SA' version. This makes IDT7142LA35C suitable for applications requiring backup power operation and ultra-low quiescent current.

Can the IDT7142LA35C be used without an IDT7132 master device?

Yes, the IDT7142LA35C can operate as a standalone dual-port SRAM without an IDT7132 master - but only in non-contention scenarios. In that case, BUSYL and BUSYR must be held high (via pull-up resistors) to disable write inhibition. Hardware arbitration is optional; however, omitting the master removes automatic protection against simultaneous writes to the same address.

Which packages are available for the IDT7142LA35C?

The IDT7142LA35C is available in 48-pin flatpack (FP48), 48-pin LCC (LC48), and 48-pin DIP (PDG48/SB48) packages. All variants share identical pinout and electrical specifications. The FP48 and LC48 packages are preferred for space-constrained industrial PCBs, while the DIP variant supports prototyping and through-hole assembly.