Renesas 7142LA55C

Overview

IDT7142LA55C 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 55 ns read/write cycle time, TTL-compatible 5V ±10% operation, and industrial temperature range (–40°C to +85°C). It enables error-free 16-bit-or-wider memory architectures when paired with IDT7132 master RAMs in real-time digital signal processing and military avionics data buffers.

For engineers reviewing the IDT7142LA55C datasheet, IDT7142LA55C pinout, IDT7142LA55C application, or IDT7142LA55C equivalent, key selection criteria include BUSY input functionality for port arbitration, 1 µA full-standby current at CMOS-level inputs, battery-backed 2V data retention, and compatibility with 48-pin flatpack, LCC, DIP, and 52-pin PLCC packages.

Technical Context

The IDT7142LA55C implements independent left/right ports with separate address (A0–A10), control (CEL/CER, OEL/OER, R/WL/R/WR), and bidirectional I/O (I/O0–I/O7) lines, enabling fully asynchronous concurrent access. Its BUSY pin functions exclusively as an input-unlike the IDT7132 master-to gate write operations during address contention.

It uses CMOS fabrication for low-power operation: 110 mA typical dynamic current at 55 ns speed, 0.2 mA typical full-standby current (ISB3) with CMOS-level CE inputs, and 200 µW typical battery-retention power at 2V. The device supports both CE-controlled and R/W-controlled write timing with tWP = 30 ns minimum.

Key Specifications

Pinout & Package

Available in 48-pin flatpack (FP48), LCC (LC48), DIP (PDG48/SB48), and 52-pin PLCC (PLG52) packages. Pin functions are identical across all packages except for pin count and physical layout; FP48/LC48/PDG48/SB48 use 48 pins, while PLG52 adds four NC pins (pins 1, 49–51).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C136-55JC and IDT7132LA55C, the IDT7142LA55C uniquely provides dedicated BUSY input behavior and 2V data retention in a slave-only configuration - making it irreplaceable in battery-backed, expandable memory subsystems requiring hardware-enforced write inhibition.

Availability

IDT7142LA55C is available at Aetrix Electronics and suitable for digital signal processing buffers, military avionics data exchange, and industrial motion controllers requiring stable component supply across extended product lifecycles.

Supply support for IDT7142LA55C 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.

The IDT7132/7142 family was designed specifically for high-reliability, real-time embedded systems requiring concurrent memory access - targeting aerospace, defense, and industrial automation applications where deterministic timing and data integrity are critical.

FAQ

What is the primary functional distinction between IDT7142LA55C and IDT7132LA55C?

IDT7142LA55C is a slave-only dual-port SRAM with BUSY pins configured as inputs to receive arbitration signals from a master device, while IDT7132LA55C is the master device featuring open-drain BUSY outputs and on-chip arbitration logic. They are complementary - IDT7142LA55C cannot operate standalone in master mode and lacks internal arbitration circuitry.

Does IDT7142LA55C support true 2V data retention, and under what conditions?

Yes, IDT7142LA55C supports guaranteed 2.0 V data retention (VDR = 2.0 V) in LA versions only, with ICCDR current ranging from 100 µA to 4000 µA depending on grade. This mode activates when CE is held high and VCC drops to 2.0 V; data remains valid indefinitely as long as VCC ≥ 2.0 V and temperature stays within specification limits.

What are the mandatory external components required for proper BUSY signal routing with IDT7142LA55C?

IDT7142LA55C requires no external pull-up on BUSY pins since they are inputs - unlike IDT7132's open-drain BUSY outputs which need 270 Ω pull-ups. However, the driving IDT7132 master must have its BUSY outputs pulled up to 5V via 270 Ω resistors, and BUSY traces must be routed with controlled impedance to avoid timing skew in high-speed arbitration.

Can IDT7142LA55C be used in a standalone configuration without a master device?

Yes, IDT7142LA55C can operate standalone as a dual-port SRAM with independent left/right access, but BUSY arbitration is disabled - BUSY pins must be tied HIGH (via pull-up if driven by another source) to prevent unintended write blocking. All timing and electrical specs remain valid; only hardware contention resolution is forfeited.

Which packages are available for IDT7142LA55C, and are pinouts compatible across them?

IDT7142LA55C is offered in 48-pin flatpack (FP48), LCC (LC48), plastic DIP (PDG48), sidebraze DIP (SB48), and 52-pin PLCC (PLG52). Pin functions are identical for all 48-pin variants; PLG52 adds four no-connect pins (1, 49–51) but maintains signal pin equivalence for the first 48 positions - PCB layout requires package-specific footprints.