Renesas 7142LA25JGI

Overview

7142LA25JGI from IDT is a 2K × 8 dual-port static RAM configured as a SLAVE device in MASTER/SLAVE memory expansion systems, supporting independent asynchronous read/write access on left and right ports, 25 ns max read cycle time (tRC), industrial temperature range (–40°C to +85°C), and 2 V data retention capability - used in real-time avionics bus arbitration and redundant control memory subsystems.

For engineers reviewing the 7142LA25JGI datasheet, 7142LA25JGI pinout, 7142LA25JGI application, or 7142LA25JGI equivalent, this page delivers verified timing parameters, BUSY-input arbitration behavior, LA-series low-power standby current specs (1 µA full standby), flatpack package mechanical data, and validated alternatives for 16-bit-or-wider dual-port SRAM designs.

Technical Context

The 7142LA25JGI implements true dual-port architecture with fully independent address, control, and I/O buses per port - no internal multiplexing or shared timing paths. Its BUSY pin functions strictly as an input (unlike the MASTER 7132), enabling write-inhibit gating when contention is detected by the MASTER device.

It supports CE-controlled and R/W-controlled write cycles with defined tWC = 25 ns, tWP = 15 ns, and tBDD ≤ 35 ns for port-to-port arbitration recovery. The LA variant uses CMOS process optimization to achieve 1 µA full-standby current (ISB3) at VCC = 5 V and retains data down to 2 V, making it suitable for battery-backed fail-safe memory applications.

Key Specifications

Pinout & Package

7142LA25JGI is supplied in a 48-pin flatpack (FP48) package with 0.75″ × 0.75″ footprint and 0.11″ height, hermetically sealed for high-reliability environments. Pin 1 is index-marked; all VCC (pins 24, 48) and GND (pins 1, 25) must be externally decoupled.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1371BV25 and IDT7132LA25JGI, the 7142LA25JGI uniquely delivers SLAVE-specific BUSY input behavior, 2 V data retention, and pin-for-pin compatibility within the IDT7132/7142 family - essential for drop-in replacement in existing MASTER/SLAVE layouts without redesign.

Availability

7142LA25JGI is available at Aetrix Electronics and suitable for avionics data buffering, redundant flight control memory, industrial PLC I/O mapping, and medical imaging frame buffer applications requiring stable component supply, long-term obsolescence management, and MIL-PRF-38535-compliant traceability.

Supply support for 7142LA25JGI 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 high-performance memory, timing, and interface solutions for communications, computing, and industrial markets.

The IDT7132/7142 product line was designed specifically for deterministic dual-port memory applications requiring hardware-based arbitration, battery backup, and industrial/military reliability - targeting aerospace, defense, and safety-critical embedded systems.

FAQ

What is the function of BUSYL and BUSYR on the 7142LA25JGI?

On the 7142LA25JGI, BUSYL and BUSYR are dedicated input pins that receive arbitration signals from a MASTER device (e.g., IDT7132). When asserted low, they internally inhibit write operations to the corresponding port - ensuring no conflicting writes occur during simultaneous access to the same memory location. This behavior is fixed and non-configurable.

Does the 7142LA25JGI support standalone operation without a MASTER device?

Yes, the 7142LA25JGI can operate standalone: BUSYL and BUSYR may be tied high (via pull-up resistors) to disable arbitration, enabling independent read/write access on both ports. However, concurrent writes to identical addresses will result in undefined data - hardware arbitration requires pairing with an IDT7132 MASTER.

What is the maximum clock frequency supported by the 7142LA25JGI for continuous read cycles?

The 7142LA25JGI does not use a clock; it is an asynchronous SRAM. Its maximum sustained read rate is determined by tRC = 25 ns, yielding up to 40 million reads per second per port. No external clock signal is required - timing is governed solely by CE, OE, and address setup/hold constraints.

Can the 7142LA25JGI retain data when VCC drops below 4.5 V?

Yes - the LA variant guarantees data retention down to VCC = 2.0 V, as confirmed in Table 6 of the datasheet. Below 2.0 V, leakage increases and retention is not assured. For reliable hold operation, maintain VCC ≥ 2.0 V using a backup source such as a supercapacitor or lithium coin cell.

Is the 7142LA25JGI pin-compatible with the 7142SA25JGI?

Yes - both share identical FP48 packaging, pinout, and DC/AC timing specifications except for standby current. The LA version reduces ISB3 from 5 µA (SA) to 1 µA and adds 2 V data retention; all control, address, and I/O pins map identically, enabling direct substitution in power-sensitive designs.