Renesas 7142SA100CB

Overview

7142SA100CB from 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, 100 ns maximum read cycle time (tRC), TTL-compatible 5V ±10% supply, and industrial temperature range (–40°C to +85°C); used in real-time digital signal processing buffers where concurrent CPU and DSP access to shared memory is required.

For engineers reviewing the 7142SA100CB datasheet, 7142SA100CB pinout, 7142SA100CB application, or 7142SA100CB equivalent, key selection considerations include BUSY input behavior (not output), absence of on-chip arbitration logic, compatibility with IDT7132SA/LA master devices for 16-bit+ width expansion, and 48-pin flatpack (FP48) packaging with verified pin mapping.

Technical Context

The 7142SA100CB implements two fully independent address/data/control interfaces - left port (A0L–A10L, I/O0L–I/O7L, CEL/OEL/R/WL/BUSYL) and right port (A0R–A10R, I/O0R–I/O7R, CER/OER/R/WR/BUSYR) - enabling true simultaneous access without internal arbitration. It lacks on-chip arbitration logic and relies entirely on external BUSY signaling from a companion IDT7132 master.

As a SLAVE device, its BUSY pins (BUSYL, BUSYR) are dedicated inputs that internally inhibit write operations when asserted low; it does not generate BUSY signals. The device supports full standby power-down via CE control and retains data only under active 5V supply - battery backup (2V retention) is exclusive to LA variants, not applicable to this SA-grade part.

Key Specifications

Pinout & Package

7142SA100CB is packaged in a 48-lead flatpack (FP48), body size ≈ 0.75 in × 0.75 in × 0.11 in, with gull-wing leads and index mark. All VCC (pins 24, 48) and GND (pins 1, 25) connections 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 CY7C133-100AXC and IDT7142SA55CB, the 7142SA100CB delivers optimal balance of industrial temperature support, proven MASTER/SLAVE interoperability with IDT7132, and lower dynamic power - making it the preferred choice for cost-sensitive, thermally constrained embedded systems requiring guaranteed arbitration timing.

Availability

7142SA100CB is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and avionics sensor modules requiring stable component supply across extended production lifecycles.

Supply support for 7142SA100CB 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 family was designed specifically for real-time embedded systems requiring deterministic, collision-free dual-processor memory sharing - emphasizing hardware-based BUSY arbitration and industrial-grade reliability.

FAQ

Is 7142SA100CB a standalone dual-port RAM or does it require a companion device?

The 7142SA100CB is a SLAVE-only device and must be used with an IDT7132SA/LA master to implement full BUSY-based arbitration. It lacks on-chip arbitration logic and cannot operate independently in contention-prone environments. The 7142SA100CB relies on external BUSY signals from the master to gate write operations - confirming its role as a coordinated expansion component, not a self-contained dual-port solution.

What is the function of BUSYL and BUSYR pins on 7142SA100CB?

On the 7142SA100CB, BUSYL and BUSYR are dedicated input pins - not outputs - that accept active-low BUSY signals from an IDT7132 master. When asserted, they internally inhibit write operations on the corresponding port. This behavior is fixed per the SLAVE designation and differs fundamentally from the IDT7132, where those pins are open-drain outputs requiring 270 Ω pull-up resistors.

Does 7142SA100CB support battery backup data retention?

No, the 7142SA100CB does not support battery backup data retention. That feature is exclusive to LA-grade variants (e.g., IDT7142LA100CB), which specify 2V data retention capability. The "SA" suffix denotes standard power operation only, with full functionality requiring continuous 5V ±10% supply - confirmed by DC electrical characteristics tables and absence of VDR or ICCDR parameters in SA-spec sections.

Which package type is used for 7142SA100CB, and is it lead-free?

The 7142SA100CB is supplied in a 48-lead flatpack (FP48) package with gull-wing leads and approximate dimensions of 0.75 in × 0.75 in × 0.11 in. Per the datasheet's "Green parts available" note and ordering information, this variant is RoHS-compliant and lead-free - consistent with IDT's green initiative across commercial and industrial temperature grades.

Can 7142SA100CB be used without an IDT7132 master in non-contention applications?

Yes, the 7142SA100CB can operate without a master in applications where left and right port accesses are guaranteed non-overlapping - for example, time-multiplexed CPU/peripheral access with strict software coordination. In such cases, BUSYL and BUSYR may be tied high (via pull-up) or left unconnected, as the device functions as a basic dual-port SRAM with independent CE/OE/RW controls. However, hardware arbitration is forfeited.