Renesas 7142LA20JG8

Overview

IDT7142LA20JG8 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 features 20 ns maximum read cycle time, 1 μA full-standby current (ISB3), battery-backed data retention at 2 V, and operates on a single 5 V ±10% supply. It is used in real-time embedded systems requiring concurrent access to shared memory - such as digital signal processors interfacing with microcontrollers or FPGA-based communication buffers.

For engineers reviewing the IDT7142LA20JG8 datasheet, IDT7142LA20JG8 pinout, IDT7142LA20JG8 application, or IDT7142LA20JG8 equivalent, key selection criteria include its role as a slave-only dual-port SRAM with BUSY input arbitration, 48-pin ceramic LCC (JG8) package, industrial temperature range (–40°C to +85°C), and compatibility with IDT7132 master devices for 16-bit+ bus width expansion.

Technical Context

The IDT7142LA20JG8 implements independent left/right ports with separate address, control, and bidirectional I/O buses, enabling fully asynchronous read/write operations without internal contention resolution logic. Unlike the IDT7132 master, it lacks on-chip arbitration and uses BUSY as an input to gate write cycles during address collisions.

Its low-power LA variant achieves 1 μA full-standby current (ISB3) and supports 2 V data retention, making it suitable for battery-backed applications. The device uses TTL-compatible inputs/outputs and requires no external level-shifting when interfaced with 5 V logic families.

Key Specifications

Pinout & Package

Package: 48-pin ceramic leadless chip carrier (LCC), JG8 suffix, body size ≈ 15.2 mm × 15.2 mm × 4.3 mm, surface-mountable with solder reflow compatibility.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C136-20JC and IS61LV25616AL-20TQLI, IDT7142LA20JG8 uniquely delivers 2 V data retention, true slave-mode BUSY input behavior, and drop-in compatibility with IDT7132-based master/slave systems - critical for industrial and aerospace applications requiring deterministic arbitration and battery backup.

Availability

IDT7142LA20JG8 is available at Aetrix Electronics and suitable for real-time digital signal processing, FPGA-CPU shared memory buffering, and battery-backed configuration storage requiring stable component supply across extended product lifecycles.

Supply support for IDT7142LA20JG8 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), now part of Renesas Electronics, specializes in high-performance timing, memory interface, and RF solutions for communications, computing, and industrial markets.

IDT7142LA20JG8 belongs to the IDT7132/7142 dual-port SRAM family, designed specifically for deterministic, contention-free memory sharing between heterogeneous processors in mission-critical embedded systems.

FAQ

What is the function of BUSYL and BUSYR on the IDT7142LA20JG8?

BUSYL and BUSYR are dedicated input pins on the IDT7142LA20JG8 that accept active-low BUSY signals from an IDT7132 master device. When asserted, they internally inhibit write operations to the corresponding port, preventing data corruption during simultaneous access to the same memory location. Unlike the IDT7132, the IDT7142LA20JG8 does not generate BUSY outputs - it relies entirely on external arbitration.

Can IDT7142LA20JG8 operate without an IDT7132 master device?

Yes, IDT7142LA20JG8 can operate as a standalone dual-port SRAM without an IDT7132 master, but BUSYL and BUSYR must be held HIGH (via pull-up resistors) to enable writes. In this mode, no hardware arbitration is provided - software or external logic must manage concurrent access to avoid data corruption. Its primary design value is realized only in master/slave configurations.

What is the significance of the 'LA' suffix in IDT7142LA20JG8?

The 'LA' suffix in IDT7142LA20JG8 denotes the low-power version with enhanced standby characteristics: ISB3 = 1 μA (vs. 15 μA for SA variants) and guaranteed 2 V data retention. This distinguishes it from the 'SA' variant, which trades retention capability for slightly faster dynamic current response but lacks battery backup support - a critical differentiator for industrial and automotive applications.

Which package type does IDT7142LA20JG8 use, and why is it suitable for industrial applications?

IDT7142LA20JG8 uses a 48-pin ceramic LCC (JG8) package with dimensions ≈ 15.2 mm × 15.2 mm × 4.3 mm. Its hermetically sealed ceramic construction provides superior moisture resistance, thermal stability, and long-term reliability under thermal cycling - essential for industrial control systems operating continuously at –40°C to +85°C without derating.

How does the 20 ns access time of IDT7142LA20JG8 impact system-level timing budgets?

The 20 ns tAA (address access time) of IDT7142LA20JG8 sets a hard lower bound on memory-read latency for each port. In systems with 50 MHz processors, this allows up to 100% bus utilization without wait states - enabling zero-cycle penalty reads in tightly coupled DSP/FPGA interfaces. Combined with 20 ns tRC, it supports sustained throughput of 50 million words per second per port.