Renesas 7142SA100J8

Overview

7142SA100J8 from IDT is a 2K × 8 dual-port static RAM configured as a slave device in master/slave memory expansion architectures, supporting independent asynchronous read/write access on left and right ports with 100 ns maximum read cycle time (tRC), 5V ±10% supply, and industrial temperature range (–40°C to +85°C). It features BUSY input for port arbitration, TTL-compatible I/O, and 48-pin flatpack packaging - used in real-time avionics data buffers and redundant controller memory subsystems.

For engineers reviewing the 7142SA100J8 datasheet, 7142SA100J8 pinout, 7142SA100J8 application, or 7142SA100J8 equivalent, key selection criteria include its role as a slave-only dual-port SRAM with BUSY-input arbitration, 100 ns timing grade, SA power variant, and compatibility with IDT7132SA100J8 master devices in 16-bit+ width-expanded systems.

Technical Context

The 7142SA100J8 implements a fully independent dual-port architecture with separate address, control, and bidirectional I/O buses per port, enabling concurrent access without internal contention detection logic - unlike the master IDT7132, it lacks on-chip arbitration and relies entirely on external BUSY signaling. Its BUSY pin functions solely as an input to gate write operations during address collision events.

It supports two distinct power-down modes: ISB1 (both ports disabled, TTL-level inputs) and ISB3 (full CMOS-level standby), delivering 20 mA typical dynamic current and 1.0 mA full-standby current at 5V. The SA suffix denotes standard active power consumption (325 mW typ.), distinguishing it from LA low-power variants with battery retention.

Key Specifications

Pinout & Package

48-pin flatpack (FP48) package with 0.050″ lead pitch, side-brazed ceramic construction, and index mark at Pin 1. All VCC pins must be decoupled locally; all GND pins require low-inductance ground plane connection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT7142SA55J8 and CY7C1371DV33-100BGXI, the 7142SA100J8 delivers optimal cost-performance balance for 5V industrial systems requiring proven reliability, hermetic packaging, and seamless integration with existing IDT7132 master-based architectures - without voltage conversion or footprint changes.

Availability

7142SA100J8 is available at Aetrix Electronics and suitable for avionics data buffering, redundant controller memory, and industrial motion control applications requiring stable component supply, long-term obsolescence management, and MIL-PRF-38535-compliant sourcing.

Supply support for 7142SA100J8 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, acquired by Renesas Electronics in 2019.

The IDT7132/7142 family was designed specifically for deterministic, contention-free dual-port memory expansion in safety-critical real-time systems - emphasizing hardware-arbitrated coherency, industrial temperature resilience, and hermetic packaging for mission-critical reliability.

FAQ

Is the 7142SA100J8 pin-compatible with the IDT7132SA100J8 master device?

No, the 7142SA100J8 is not pin-compatible with the IDT7132SA100J8. While both share the same 48-pin flatpack footprint and core signal mapping, the BUSY pins function as inputs on the 7142SA100J8 but as open-drain outputs on the 7132SA100J8 - requiring external 270 Ω pull-up resistors on the master side. Direct substitution would disrupt arbitration signaling and cause write failures.

What is the maximum operating frequency supported by the 7142SA100J8 in a read-only configuration?

The 7142SA100J8 supports a maximum sustained read frequency of 10 MHz, derived from its 100 ns read cycle time (tRC). This assumes proper setup/hold timing compliance for address and control signals, and excludes any additional delays introduced by PCB trace length or load capacitance beyond the specified 30 pF test condition.

Does the 7142SA100J8 support battery backup data retention like some LA-series variants?

No, the 7142SA100J8 does not support battery backup data retention. Only LA-suffix variants (e.g., 7142LA100J8) provide 2V data retention capability. The SA designation indicates standard active power consumption (325 mW typ.) and absence of low-voltage retention circuitry - confirmed by missing VDR and ICCDR parameters in its DC electrical characteristics table.

Can the 7142SA100J8 operate reliably at 4.5V supply voltage?

Yes, the 7142SA100J8 is fully specified to operate at 4.5V minimum supply voltage per its Absolute Maximum Ratings and DC Operating Conditions tables. All timing parameters (including 100 ns tRC) and current consumption values remain valid across the full 4.5V–5.5V range, making it suitable for systems with brown-out tolerant 5V rails.

How is port arbitration handled when multiple 7142SA100J8 devices are used in parallel?

Port arbitration across multiple 7142SA100J8 devices requires a single IDT7132SA100J8 master to generate consolidated BUSY signals - each 7142SA100J8 receives the same BUSY output from the master. Using more than one master would create conflicting BUSY assertions and undefined write behavior, violating the documented master/slave expansion methodology.