Renesas 7024S17J

Overview

7024S17J from IDT is a high-speed 4K × 16 true dual-port static RAM with independent left/right ports, 17 ns maximum read cycle time (commercial grade), TTL-compatible 5V ±10% supply, and on-chip semaphore arbitration logic. It enables simultaneous asynchronous access to the same memory location and supports MASTER/SLAVE cascading for 32-bit+ bus expansion in real-time embedded systems.

For engineers reviewing the 7024S17J datasheet, 7024S17J pinout, 7024S17J application, or 7024S17J equivalent, this page delivers verified timing specs, validated dual-port arbitration behavior, confirmed 84-pin PLCC package mapping, battery-backed data retention at 2V, and precise interrupt/busy flag signaling per port - all critical for deterministic multi-processor memory sharing designs.

Technical Context

The 7024S17J implements fully asynchronous dual-port operation with separate address, control, and I/O buses per port, enabling concurrent reads/writes without external arbitration logic. Its on-chip port arbitration resolves contention via BUSY flag assertion and supports semaphore signaling through dedicated SEM pins and I/O0-based flag writes.

It features separate upper-byte (UB/UBR) and lower-byte (LB/LBR) enables for multiplexed bus compatibility, full TTL-level interface compliance, and automatic power-down via chip enable (CE). The device operates across commercial temperature range (0°C to +70°C) and retains data at 2V in low-power (L) mode - though 7024S17J is the S-version with 750 mW active / 5 mW standby typical power.

Key Specifications

Pinout & Package

7024S17J is packaged in an 84-pin Plastic Leaded Chip Carrier (PLCC), with 4 corner pins designated as N/C (not connected), and dual-port signal symmetry: left port (L) and right port (R) each feature dedicated A0–A11, I/O0–I/O15, CE, OE, R/W, UB/LB, SEM, INT, and BUSY signals plus shared VCC/GND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C024AV-15AXC and IDT70V24S15PF, the 7024S17J offers proven 5V TTL interoperability, mature PLCC packaging for through-hole reliability, and seamless integration into legacy real-time control systems where voltage and footprint compatibility are mandatory.

Availability

7024S17J is available at Aetrix Electronics and suitable for real-time multi-processor communication, digital signal processing buffering, and industrial PLC memory expansion requiring stable component supply, long-lifecycle support, and verified dual-port timing behavior.

Supply support for 7024S17J 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, now part of Renesas Electronics since 2019.

The IDT7024 product line was engineered for deterministic, low-latency memory sharing in tightly coupled multi-processor systems - delivering hardware-arbitrated dual-port access without software overhead or external logic.

FAQ

What is the maximum read cycle time specified for the 7024S17J?

The 7024S17J has a maximum read cycle time (tRC) of 17 ns under commercial operating conditions (0°C to +70°C, VCC = 5.0 V ±10%). This value is guaranteed across the full temperature and voltage range and defines the shortest interval between successive read operations on the same port. The 7024S17J achieves this performance using high-speed CMOS process technology and optimized on-die timing paths.

Does the 7024S17J support battery backup operation?

Yes, the 7024S17J supports battery backup operation with data retention down to 2 V (VDR = 2.0 V min). While the "L" version (e.g., 7024L17J) is optimized for ultra-low standby current (1 µA typ), the "S" version (7024S17J) retains data at 2 V with typical standby current of 5 mW - sufficient for short-duration brown-out protection in industrial control applications.

How does the Master/Slave (M/S) pin affect BUSY signal behavior on the 7024S17J?

When M/S = H (High), the 7024S17J operates as Master: BUSYL and BUSYR are outputs that assert during port contention to stall conflicting writes. When M/S = L (Low), it operates as Slave: BUSYL and BUSYR become inputs used to synchronize with a Master device. This configuration enables scalable cascading of multiple 7024S17J devices for wider data buses without external arbitration logic.

Can the 7024S17J perform simultaneous reads from both ports to the same memory address?

Yes, the 7024S17J uses true dual-ported memory cells that permit simultaneous reads from both left and right ports to identical addresses without contention or timing penalty. This capability is fundamental to its architecture and enables lock-free data sharing in symmetric multiprocessing systems - a key differentiator from pseudo-dual-port or pipelined SRAMs.

What package type is used for the 7024S17J?

The 7024S17J is supplied in an 84-pin Plastic Leaded Chip Carrier (PLCC) package, as confirmed by IDT documentation and pin diagrams labeled "PLG84" and "7024 PLCC Top View". This surface-mount package features J-leads, provides mechanical robustness for industrial environments, and is compatible with standard reflow soldering processes.