Renesas 7140SA100PF8

Overview

7140SA100PF8 from IDT (Integrated Device Technology) is a 1K × 8 dual-port static RAM configured as a SLAVE device in MASTER/SLAVE memory expansion systems, supporting fully asynchronous left/right port access with 100 ns maximum read/write cycle time, 5 V ±10% single-supply operation, and industrial temperature range (–40°C to +85°C). It enables error-free 16-bit-or-wider memory systems without external arbitration logic.

For engineers reviewing the 7140SA100PF8 datasheet, 7140SA100PF8 pinout, 7140SA100PF8 application, or 7140SA100PF8 equivalent, key selection criteria include BUSY input behavior (not output), absence of on-chip arbitration logic, compatibility with IDT7130 MASTER devices, and support for CE-controlled or R/W-controlled write timing in real-time inter-processor communication systems.

Technical Context

The 7140SA100PF8 operates as a SLAVE dual-port SRAM with dedicated BUSY inputs (BUSYL, BUSYR) that must be driven by an external MASTER (e.g., IDT7130) to prevent simultaneous writes to shared addresses. It lacks internal arbitration logic and relies entirely on external BUSY signaling for conflict resolution.

Each port features independent control (CEL/CER, OEL/OER, R/WL/R/WR), address (A0L–A9L / A0R–A9R), and data (I/O0L–I/O7L / I/O0R–I/O7R) lines, enabling concurrent read/write operations across ports when no address contention occurs. The device supports TTL-compatible logic levels and requires pull-up resistors on open-drain INTL/INTR outputs.

Key Specifications

Pinout & Package

7140SA100PF8 is supplied in a 48-pin ceramic flatpack (FP48) package measuring approximately 0.75 in × 0.75 in × 0.11 in, with leads arranged in dual in-line configuration and pin 1 indexed by notch or dot.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C131-100AXC and AS7C31025B-10JCIN, the 7140SA100PF8 delivers optimized cost and simplicity for established 5 V industrial systems requiring SLAVE-only expansion with proven IDT MASTER/SLAVE interoperability.

Availability

7140SA100PF8 is available at Aetrix Electronics and suitable for real-time inter-processor communication, redundant control systems, and DSP co-processing applications requiring stable component supply across extended production lifecycles.

Supply support for 7140SA100PF8 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 timing, memory interface, RF, and high-performance computing solutions, now part of Renesas Electronics.

The IDT7140 product line was designed specifically for SLAVE-side memory expansion in MASTER/SLAVE dual-port SRAM architectures, targeting deterministic, low-latency inter-processor communication in industrial and military systems.

FAQ

What is the role of BUSYL and BUSYR on the 7140SA100PF8?

On the 7140SA100PF8, BUSYL and BUSYR are active-low input signals - not outputs - used exclusively to receive arbitration status from an external MASTER device (e.g., IDT7130). When asserted low, they inhibit writes to the corresponding port, preventing data corruption during address contention. The 7140SA100PF8 itself contains no arbitration logic and cannot drive BUSY signals.

Can the 7140SA100PF8 operate as a standalone dual-port RAM without a MASTER device?

No - the 7140SA100PF8 is designed strictly as a SLAVE device and lacks on-chip arbitration logic, BUSY output capability, and interrupt generation logic required for autonomous operation. It must be paired with a compatible MASTER such as the IDT7130 to resolve port conflicts and manage inter-processor handshaking; standalone use will result in undefined write behavior during contention.

What is the maximum supported clock frequency for synchronous interfaces using the 7140SA100PF8?

While the 7140SA100PF8 is fully asynchronous, its 100 ns access time supports reliable operation with system clocks up to 10 MHz when interfaced to microcontrollers or FPGAs using standard read/write strobes. Timing margins must account for board trace delays and setup/hold requirements - the tRC (100 ns), tAA (100 ns), and tWP (55 ns) parameters define the hard limits for cycle-based interfacing.

Does the 7140SA100PF8 support battery backup or low-voltage data retention?

No - the 7140SA100PF8 is the SA (standard power) variant and does not support battery backup or data retention below 4.5 V. For 2 V data retention capability, the LA variant (e.g., 7140LA100PF8) must be selected, which specifies ICCDR ≤ 4000 µA at VCC = 2.0 V and TA = +25°C, enabling operation from backup batteries in power-fail scenarios.

Which packages are available for the 7140SA100PF8, and what does 'PF8' signify?

The 'PF8' suffix in 7140SA100PF8 denotes the 48-pin ceramic flatpack (FP48) package with 0.050-inch lead pitch. This package is distinct from DIP, LCC, PLCC, and TQFP variants - FP48 provides hermetic sealing and superior thermal performance for industrial and military applications, with body dimensions of approximately 0.75 in × 0.75 in × 0.11 in.