Renesas 7130LA20J

Overview

7130LA20J 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, 20 ns maximum read cycle time, 1 mW typical standby power, and 2 V data retention capability. It enables concurrent asynchronous access from left and right ports in real-time interprocessor communication systems.

For engineers reviewing the 7130LA20J datasheet, 7130LA20J pinout, 7130LA20J application, or 7130LA20J equivalent, key selection criteria include bus contention handling via BUSY flag arbitration, INT/INTR port-to-port signaling, battery-backed data retention at 2 V, TTL-compatible 5 V ±10% operation, and industrial temperature range support (–40°C to +85°C).

Technical Context

The 7130LA20J implements fully asynchronous dual-port architecture with independent address, control, and I/O buses per port. Its on-chip arbitration logic resolves simultaneous access conflicts by asserting open-drain BUSYL/BUSYR outputs-requiring external pull-up resistors-and supports priority-based write inhibition when address matches occur.

It features dedicated interrupt signaling (INTL/INTR) for cross-port event notification and supports both CE-controlled and R/W-controlled write cycles. The LA variant includes CMOS-level full-standby mode (ISB3 = 0.2 mA typ.) and guaranteed 2 V data retention (VDR = 2.0 V), distinguishing it from SA versions.

Key Specifications

Pinout & Package

7130LA20J is packaged in a 48-pin ceramic flatpack (FP48) with 0.75″ × 0.75″ body size and side-brazed construction for hermetic reliability. Pin 1 is index-marked; all VCC pins require local decoupling, and all GND pins must be connected to ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT7140LA20J and CY7C024AV-20AXC, the 7130LA20J uniquely combines MASTER arbitration, 2 V retention, and industrial-grade 5 V operation in a single 48-pin FP package-making it irreplaceable in legacy avionics and industrial control where power integrity and deterministic contention resolution are non-negotiable.

Availability

7130LA20J is available at Aetrix Electronics and suitable for real-time interprocessor communication, digital signal processing buffering, avionics data logging, and industrial PLC memory expansion requiring stable component supply across extended product lifecycles.

Supply support for 7130LA20J 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) was a fabless semiconductor company specializing in timing, memory interface, RF, and high-performance silicon solutions before its acquisition by Renesas Electronics in 2019.

The IDT7130/7140 family was designed specifically for deterministic, contention-free dual-ported memory applications in military, industrial, and communications infrastructure-emphasizing arbitration robustness, low-power retention, and wide temperature operation.

FAQ

What is the function of the BUSYL and BUSYR pins on the 7130LA20J?

The BUSYL and BUSYR pins on the 7130LA20J are open-drain arbitration status outputs indicating port contention. When asserted LOW (with external pull-up), they block write operations to the respective port during address collisions. Both pins are outputs only on the MASTER 7130LA20J; on SLAVE devices like IDT7140LA20J, they serve as inputs. This mechanism ensures deterministic resolution without external logic.

Does the 7130LA20J support true simultaneous read/write operations from both ports?

Yes, the 7130LA20J supports fully asynchronous concurrent access: one port can read while the other writes, provided addresses differ. If both ports access the same address, on-chip arbitration asserts BUSYL or BUSYR to inhibit the later-arriving write. Valid data from the winning port appears after tBDD delay (25 ns max for 20 ns version), preserving data integrity without system-level intervention.

What is the significance of the "LA" suffix in 7130LA20J?

The "LA" suffix in 7130LA20J denotes the Low-Power, Battery-Backup variant. It delivers 1 mW typical standby power (vs. 5 mW for SA) and guarantees data retention down to 2.0 V (VDR), enabling operation from backup batteries or supercapacitors during main power loss. This distinguishes it from the "SA" (Standard Active) version, which lacks retention capability.

Can the 7130LA20J operate in a 3.3 V system?

No, the 7130LA20J is specified exclusively for 5.0 V ±10% (4.5–5.5 V) operation and is not 3.3 V compatible. Its input thresholds (VIH = 2.2 V min, VIL = 0.8 V max) and output drive strength assume 5 V rails. Attempting 3.3 V operation violates Recommended DC Operating Conditions and risks undefined behavior, especially in arbitration and retention modes.

How does the interrupt functionality work between ports on the 7130LA20J?

The 7130LA20J uses INTL (left port) and INTR (right port) open-drain signals to notify the opposite port of events. Writing to address 3FFH on the left port sets INTR; writing to 3FEH on the right port sets INTL. These flags remain asserted until cleared by corresponding reset addresses, enabling hardware-triggered, low-latency interprocessor messaging without polling or shared registers.