Renesas 7024S15JI8

Overview

7024S15JI8 from IDT is a high-speed 4K × 16 true dual-port static RAM with 15 ns maximum read cycle time, TTL-compatible 5V ±10% supply, and industrial temperature range (–40°C to +85°C). It supports simultaneous independent access from left and right ports, on-chip semaphore arbitration, and battery-backed data retention down to 2V. It is used in real-time embedded systems requiring concurrent CPU/DSP memory access, such as radar signal processors and telecom line cards.

For engineers reviewing the 7024S15JI8 datasheet, 7024S15JI8 pinout, 7024S15JI8 application, or 7024S15JI8 equivalent, this page delivers verified specifications, validated pin functions, confirmed industrial-grade timing behavior, and peer-validated alternatives for dual-port SRAM selection in deterministic multi-processor architectures.

Technical Context

The 7024S15JI8 implements fully asynchronous dual-port operation with separate address, control, and I/O buses per port. Its on-chip arbitration logic resolves contention via BUSY flag signaling and master/slave configuration (M/S pin), enabling error-free cascading in 32-bit+ word systems without external logic.

It integrates full hardware semaphore support across eight flags (addressed by A0–A2), with dedicated SEM, INT, and BUSY signals per port. The device uses CMOS process technology and supports both byte-select (UB/LB) and chip-enable (CE) power-down modes, delivering 750 mW typical active and 5 mW typical standby power.

Key Specifications

Pinout & Package

7024S15JI8 is packaged in an 84-pin Plastic Leaded Chip Carrier (PLCC), body size ≈ 1.15 in × 1.15 in × 0.17 in, with gull-wing leads and internal heat slug for thermal dissipation in high-density layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C133-15VC and AS7C34096B-15JCIN, the 7024S15JI8 uniquely supports hardware-expandable multi-SRAM topologies via M/S pin and offers tighter BUSY-to-data timing (tBDD ≤ 30 ns), making it optimal for deterministic real-time systems requiring scalable shared memory.

Availability

7024S15JI8 is available at Aetrix Electronics and suitable for radar signal processing, telecom line card buffering, and motor control co-processor interfaces requiring stable component supply across extended product lifecycles.

Supply support for 7024S15JI8 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, and RF solutions, acquired by Renesas in 2019.

The IDT7024 family was designed specifically for deterministic, low-latency inter-processor communication in military, industrial, and telecom infrastructure - emphasizing hardware arbitration, battery retention, and expandable dual-port topology.

FAQ

What is the guaranteed maximum access time for the 7024S15JI8 under industrial temperature conditions?

The 7024S15JI8 guarantees a maximum read cycle time (tRC) of 15 ns across the full industrial temperature range (–40°C to +85°C) and 5.0 V ±10% supply, as specified in the AC Electrical Characteristics table for the "7024X15" speed grade. This value is production-tested and applies to both ports independently.

Does the 7024S15JI8 support battery backup operation, and what is the minimum retention voltage?

Yes, the 7024S15JI8 supports battery backup operation with a minimum data retention voltage of 2.0 V (VDR), as confirmed in the Data Retention Characteristics table. At this voltage, the device maintains stored data indefinitely while drawing ≤4000 µA (typical 100 µA) in retention mode.

How does the M/S pin affect BUSY signal behavior in a multi-device 7024S15JI8 configuration?

When M/S = HIGH, the 7024S15JI8 operates as a Master: BUSYL and BUSYR are output-only flags indicating port contention. When M/S = LOW, it operates as a Slave: BUSYL and BUSYR become inputs, allowing upstream Master devices to control access - enabling hierarchical arbitration in cascaded 32-bit+ memory systems.

Can both ports of the 7024S15JI8 perform simultaneous reads to the same memory location without conflict?

Yes, the 7024S15JI8 uses true dual-port memory cells that allow fully concurrent reads from both left and right ports to identical addresses. No arbitration or BUSY assertion occurs in this case - valid data appears on both I/O buses within tAA (≤15 ns) of respective address setup.

What package type does the 'J' suffix denote in the 7024S15JI8 part number?

The 'J' suffix in 7024S15JI8 specifies an 84-pin Plastic Leaded Chip Carrier (PLCC) package, as documented in IDT's ordering information and confirmed in the Pin Configurations section. This package features gull-wing leads, JEDEC-standard footprint, and is RoHS-compliant.