Renesas 7142LA20J

Overview

IDT7142LA20J 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 systems, supporting independent asynchronous read/write access on left and right ports with 20 ns read cycle time, TTL-compatible 5V ±10% operation, and battery-backed data retention down to 2V - used in real-time avionics bus controllers requiring concurrent CPU and DMA access to shared memory.

For engineers reviewing the IDT7142LA20J datasheet, IDT7142LA20J pinout, IDT7142LA20J application, or IDT7142LA20J equivalent, key selection criteria include BUSY input functionality (not output), 1 mW standby power, industrial temperature range (–40°C to +85°C), and compatibility with IDT7132 master devices for 16-bit+ word width expansion without external arbitration logic.

Technical Context

The IDT7142LA20J implements a true dual-port SRAM architecture with fully independent left/right address, control, and I/O buses, enabling simultaneous non-conflicting accesses. Its BUSY pin functions strictly as an input - unlike the IDT7132 master - to receive write-inhibit signals during port-to-port address contention.

It supports two distinct power-down modes: ISB1/ISB2 (TTL-level CE inputs, ~25 mA standby) and ISB3/ISB4 (CMOS-level CE inputs, 0.2 mA typical), with full data retention at V_CC = 2.0 V. The device uses CMOS process technology and requires no external clock or refresh circuitry.

Key Specifications

Pinout & Package

Package: 48-pin Flatpack (FP48), hermetically sealed ceramic package with 0.75 in × 0.75 in footprint and 0.11 in height, suitable for high-reliability aerospace and industrial applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1371D-20ZC and IS61LV25616AL-20TQLI, the IDT7142LA20J uniquely delivers hardware-enforced port arbitration via BUSY input, 2V data retention, and drop-in compatibility with IDT7132 masters - making it irreplaceable in deterministic real-time systems where write collision avoidance must be guaranteed at silicon level.

Availability

IDT7142LA20J is available at Aetrix Electronics and suitable for avionics data buffering, industrial PLC dual-port memory, and medical imaging frame store applications requiring stable component supply, long-term obsolescence management, and traceable sourcing for certified designs.

Supply support for IDT7142LA20J 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. IDT pioneered high-performance dual-port SRAM architectures for real-time embedded systems.

The IDT7142LA20J belongs to IDT's legacy 71xx dual-port SRAM family, designed specifically for deterministic, contention-free memory sharing between heterogeneous processors, DMA engines, and peripherals in mission-critical industrial and aerospace control systems.

FAQ

What is the function of the BUSY pins on the IDT7142LA20J?

The BUSYL and BUSYR pins on the IDT7142LA20J serve exclusively as inputs - unlike the IDT7132 master - and must be driven low by an external IDT7132 to inhibit writes during address contention. They are not open-drain outputs and require no pull-up resistors. This design ensures the IDT7142LA20J acts solely as a slave in MASTER/SLAVE configurations, with write gating performed internally when BUSY is asserted.

Does the IDT7142LA20J support true simultaneous read/write operations on both ports?

Yes, the IDT7142LA20J supports fully independent asynchronous read and write operations on left and right ports - provided addresses do not collide. When both ports access the same memory location concurrently, the BUSY input (driven by IDT7132) triggers automatic write inhibition on the delayed port, preserving data integrity. No external logic is needed for this arbitration.

What is the minimum supply voltage for data retention on the IDT7142LA20J?

The IDT7142LA20J guarantees data retention down to V_CC = 2.0 V, as specified in the "Data Retention Characteristics" section of its datasheet. At this voltage, ICCDR remains ≤4000 µA under industrial temperature conditions. Operation below 2.0 V is undefined and may result in data loss.

Can the IDT7142LA20J be used without an IDT7132 master device?

Yes - the IDT7142LA20J can operate as a standalone dual-port SRAM with both ports fully functional. However, its BUSY pins must be held high (non-active) via external pull-ups or logic, since they lack internal pull-ups and serve only as arbitration inputs. In standalone mode, software or external logic must manage address contention.

Which packages are available for the IDT7142LA20J, and is the FP48 RoHS-compliant?

The IDT7142LA20J is available in 48-pin Flatpack (FP48), 48-pin LCC (LC48), and 52-pin PLCC (PLG52) packages. Per IDT's ordering information, "Green parts available" confirms RoHS-compliant versions exist; the FP48 variant meets JEDEC J-STD-020 moisture sensitivity level 1 and is lead-free compatible.