Renesas 7007S20J

Overview

7007S20J from IDT (Integrated Device Technology) is a high-speed 32K × 8 dual-port static RAM with true independent left/right ports, 20 ns maximum access time (industrial grade), 5 V ±10% single-supply operation, and on-chip semaphore and interrupt logic - used in real-time inter-processor communication systems such as industrial PLCs and embedded dual-CPU controllers.

For engineers reviewing the 7007S20J datasheet, 7007S20J pinout, 7007S20J application, or 7007S20J equivalent, key selection considerations include BUSY arbitration timing (tBDD ≤ 30 ns), master/slave configuration via M/S pin, simultaneous read capability, and 80-pin TQFP packaging for high-density board layouts.

Technical Context

The 7007S20J implements fully asynchronous dual-port architecture with separate address, data, and control buses per port (A0L–A14L/I/O0L–I/O7L/R/WL/CEL/OEL on left; A0R–A14R/I/O0R–I/O7R/R/WR/CER/OER on right), enabling concurrent read/write operations without external arbitration logic. Its on-chip arbitration logic resolves contention via BUSYL/BUSYR flags and supports both address-match and CE-controlled BUSY assertion modes.

It integrates dedicated semaphore registers (8 flags, addressed by A0–A2) accessible when SEM = VIL and CE = VIH, and interrupt flags (INTL/INTR) triggered by writes to fixed addresses (7FFE_H, 7FFF_H). All I/Os are TTL-compatible with push-pull BUSY/INT outputs and tri-state data drivers controlled by OE and CE.

Key Specifications

Pinout & Package

7007S20J is packaged in an 80-pin thin quad flatpack (TQFP) with exposed thermal pad, pin pitch 0.5 mm, body size 14 mm × 14 mm × 1.4 mm. Pin 1 marked by dot; pin numbering follows standard counter-clockwise sequence from top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-20AC and R1EX24032AS0C-20#U0, the 7007S20J uniquely integrates full hardware arbitration (BUSY), semaphore registers, and interrupt mailboxes in a single 80-pin package - reducing system-level logic count and guaranteeing deterministic inter-processor timing without software intervention.

Availability

7007S20J is available at Aetrix Electronics and suitable for industrial automation, avionics data concentrators, and medical imaging subsystems requiring stable component supply, extended temperature operation, and long-lifecycle support.

Supply support for 7007S20J 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 7007S20J belongs to IDT's legacy dual-port SRAM product line, designed specifically for deterministic inter-processor communication in real-time embedded systems where hardware-enforced concurrency control is mandatory.

FAQ

What is the maximum operating temperature range supported by the 7007S20J?

The 7007S20J is rated for industrial temperature operation from −40°C to +85°C. This specification is confirmed in the Absolute Maximum Ratings table and DC Operating Conditions section of the official IDT datasheet DSC 2940/16. It does not support extended military-grade ranges (−55°C to +125°C) unless explicitly ordered as a 7007M variant - the 7007S20J part number denotes industrial-grade qualification.

Does the 7007S20J support simultaneous read operations from both ports to the same memory address?

Yes, the 7007S20J supports true simultaneous reads from both ports to the same memory location. This capability is explicitly stated in the Features section ("True Dual-Ported memory cells which allow simultaneous reads of the same memory location") and is inherent to its dual-port SRAM cell architecture - no BUSY assertion or arbitration delay occurs during concurrent reads.

How is master/slave configuration implemented on the 7007S20J?

Master/slave configuration on the 7007S20J is controlled solely by the M/S pin: when M/S = H (high), BUSYL and BUSYR function as push-pull outputs indicating port contention; when M/S = L (low), BUSYL and BUSYR become inputs that inhibit writes when driven low by a master device. This allows flexible cascading of multiple 7007S20J units for wider data buses without external logic.

What are the valid address ranges for interrupt mailbox functionality in the 7007S20J?

The 7007S20J uses fixed addresses 7FFE_H (32766 decimal) to assert the left-port interrupt flag (INTL) and 7FFF_H (32767 decimal) to assert the right-port interrupt flag (INTR). These are documented in Truth Table III and the Functional Description section. Writes to these addresses with appropriate CE/R/W conditions trigger the respective flags; reads clear them.

Is the 7007S20J pin-compatible with other members of the IDT7007 family such as the 7007L or 7007X25 variants?

Yes, the 7007S20J is pin-compatible with all 80-pin TQFP variants in the IDT7007 family, including 7007L and 7007X25. The pin configuration diagram PNG80(4) applies identically across speed grades and temperature grades in this package. Differences are limited to AC timing parameters and DC current specs - no PCB layout change is required when substituting within the same package option.