Renesas 7130LA55PFI

Overview

7130LA55PFI from IDT (Integrated Device Technology) is a high-speed 1K × 8 dual-port static RAM configured as a MASTER device with on-chip arbitration logic, 55 ns maximum read/write cycle time, 1 mA typical standby current, and battery-backed data retention down to 2 V. It enables full-speed 16-bit-or-wider memory systems when paired with IDT7140 SLAVE devices in industrial control and real-time DSP co-processing applications.

For engineers reviewing the 7130LA55PFI datasheet, 7130LA55PFI pinout, 7130LA55PFI application, or 7130LA55PFI equivalent, key selection considerations include its open-drain BUSY output requiring external pull-up, TTL-compatible 5 V ±10% supply, industrial temperature range (–40°C to +85°C), and mandatory use of CE/R/W-controlled write timing for port-to-port contention resolution.

Technical Context

The 7130LA55PFI implements fully asynchronous dual-port operation with independent left/right address, control, and I/O buses. Its on-chip arbitration logic resolves simultaneous access to the same memory location by asserting BUSYL/BUSYR outputs - open-drain signals that require external pull-up resistors and inhibit writes when low.

It supports two distinct write modes: R/W-controlled (where R/W = VIL initiates write) and CE-controlled (where CE = VIL initiates write), with timing parameters including tWP = 30 ns (min), tWC = 55 ns (min), and tBDD = 55 ns (max) for BUSY-disable-to-valid-data delay during port-to-port reads after writes.

Key Specifications

Pinout & Package

48-pin plastic DIP (PDG48) package, 0.600-inch body width, 0.300-inch row spacing, through-hole mount compatible with standard 0.100-inch grid PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C024AV-55AXC and IDT7140LA55PFI, the 7130LA55PFI uniquely integrates arbitration logic and open-drain BUSY/INT outputs - making it the sole choice for self-contained, low-latency dual-processor memory sharing without external logic or voltage translation.

Availability

7130LA55PFI is available at Aetrix Electronics and suitable for industrial PLCs, real-time DSP co-processors, redundant safety controllers, and battery-backed configuration storage requiring stable component supply across extended product lifecycles.

Supply support for 7130LA55PFI 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, interface, and RF solutions, now part of Renesas Electronics.

The IDT7130/7140 family was designed specifically for deterministic, low-latency dual-processor memory sharing in industrial automation, telecommunications infrastructure, and military computing - prioritizing hardware arbitration, battery retention, and wide-temperature reliability over density or cost.

FAQ

What is the minimum VCC required for data retention in the 7130LA55PFI?

The 7130LA55PFI guarantees data retention down to VCC = 2.0 V, as specified in Table 7 (Data Retention Characteristics). At this voltage, ICCDR is ≤4000 µA for industrial/military grades, enabling reliable hold during brownout conditions. This feature is exclusive to LA variants and not supported in SA versions.

Does the 7130LA55PFI require external pull-up resistors on BUSY and INT pins?

Yes, the 7130LA55PFI's BUSYL, BUSYR, INTL, and INTR pins are open-drain outputs and require external pull-up resistors to VCC. The datasheet specifies 4.7 kΩ as the recommended value (Figure 3, AC Test Conditions), ensuring proper logic-high levels and noise margin during arbitration and interrupt signaling.

Can the 7130LA55PFI operate as a standalone 8-bit memory without a SLAVE device?

Yes, the 7130LA55PFI functions fully as a stand-alone 8-bit dual-port SRAM. Its on-chip arbitration logic, BUSY outputs, and interrupt flags remain active and usable in single-device configurations. The SLAVE pairing (with IDT7140) is optional and only required when expanding to 16-bit or wider data paths.

What is the meaning of "MASTER" in the context of the 7130LA55PFI?

"MASTER" denotes that the 7130LA55PFI contains integrated port arbitration logic and drives BUSY outputs to manage contention. Unlike SLAVE devices (e.g., IDT7140), it autonomously resolves simultaneous left/right access and asserts BUSY to block conflicting writes - eliminating need for external arbitration circuitry in dual-processor systems.

Which package type does the 7130LA55PFI use, and what are its mechanical dimensions?

7130LA55PFI uses the PDG48 (48-pin plastic DIP) package, with body dimensions of approximately 0.55 inch × 0.61 inch × 0.19 inch (13.97 mm × 15.49 mm × 4.83 mm). Pin 1 is marked by a notch or dot, and the layout follows standard DIP numbering (counterclockwise from top-left corner).