Renesas 7007S20JI

Overview

IDT7007S20JI 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/interrupt arbitration logic - used in real-time inter-processor communication systems such as industrial PLCs and dual-CPU embedded controllers.

For engineers reviewing the 7007S20JI datasheet, 7007S20JI pinout, 7007S20JI application, or 7007S20JI equivalent, key selection considerations include BUSY flag timing under M/S = VIH configuration, tBDD delay for port-to-port read-after-write validation, and compatibility with 80-pin TQFP layout constraints in space-constrained control modules.

Technical Context

The 7007S20JI 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 simultaneous non-contention reads of identical memory locations. It supports MASTER/SLAVE cascading via M/S pin to expand data width beyond 8 bits without external logic.

On-chip arbitration includes push-pull BUSY outputs (not open-drain), semaphore flag registers (8 flags, addressed by A0–A2), and interrupt flags (INTL/INTR) triggered by writes to dedicated mailbox addresses (7FFE_H/7FFF_H). All timing parameters - including tBAA (BUSY access), tSAA (semaphore access), and tINS/tINR (interrupt set/reset) - are specified at 20 ns max for industrial temperature range (−40°C to +85°C).

Key Specifications

Pinout & Package

7007S20JI is packaged in an 80-pin thin quad flatpack (TQFP) with 0.5 mm pitch, body size 14 mm × 14 mm × 1.4 mm. All VCC pins must be connected to 5 V supply; all GND pins must be connected to system ground.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-20AC and R1EX24032AS0I#U0, the 7007S20JI uniquely integrates hardware semaphore, interrupt mailbox, and MASTER/SLAVE cascading in a single industrial-grade package - reducing design risk and validation effort for safety-critical dual-processor systems.

Availability

7007S20JI is available at Aetrix Electronics and suitable for industrial PLCs, avionics data concentrators, railway interlocking systems, and medical imaging subsystems requiring stable component supply across extended product lifecycles.

Supply support for 7007S20JI 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 sensor solutions, now part of Renesas Electronics since 2019.

The IDT7007 family was designed specifically for deterministic inter-processor communication in real-time embedded systems - emphasizing hardware arbitration, low-latency access, and industrial reliability over density or cost-per-bit.

FAQ

What is the maximum operating temperature range for the 7007S20JI?

The 7007S20JI is rated for industrial temperature operation from −40°C to +85°C. This specification is validated per the manufacturer's datasheet revision DSC 2940/16 (September 2019) and applies to all AC and DC electrical characteristics, including tAA = 20 ns max, BUSY timing, and semaphore access. It is not rated for military or extended commercial ranges.

Does the 7007S20JI support true simultaneous read operations from both ports to the same memory address?

Yes, the 7007S20JI implements true dual-port SRAM cells that allow concurrent reads from both left and right ports to identical memory locations without contention or timing penalty. This capability is explicitly stated in the "Features" section of the datasheet and confirmed by the functional block diagram showing independent I/O paths and arbitration logic.

How does the M/S pin affect BUSY signal behavior in the 7007S20JI?

When M/S = HIGH, the 7007S20JI operates as a MASTER: BUSYL and BUSYR are push-pull outputs indicating port contention. When M/S = LOW, it operates as a SLAVE: BUSYL and BUSYR become inputs that inhibit writes when driven LOW by a MASTER device - enabling cascaded multi-device configurations without external logic.

What are the valid interrupt mailbox addresses for the 7007S20JI?

The 7007S20JI uses fixed interrupt mailbox addresses: writing to address 7FFE_H asserts the left-port INTL flag, and writing to 7FFF_H asserts the right-port INTR flag. Clearing is performed by reading those same addresses. These locations are reserved for interrupt use only when the feature is enabled; otherwise, they function as standard SRAM locations.

Is the 7007S20JI pin-compatible with other members of the IDT7007 family, such as the 7007L variant?

No - the 7007S20JI (industrial 20 ns, 80-pin TQFP) is not pin-compatible with the 7007L (commercial 15 ns, 68-pin PLCC). Package type, pin count, and thermal pad configuration differ fundamentally. Migration requires PCB redesign; however, logic-level timing and register mapping remain consistent across the IDT7007 family.