Renesas 7024S25J8

Overview

7024S25J8 from IDT is a high-speed 4K × 16 true dual-port static RAM with independent left/right ports, 25 ns max read cycle time (commercial grade), TTL-compatible 5V ±10% supply, and on-chip semaphore arbitration logic-used in real-time inter-processor communication systems requiring simultaneous memory access without external logic.

For engineers reviewing the 7024S25J8 datasheet, 7024S25J8 pinout, 7024S25J8 application, or 7024S25J8 equivalent, key selection considerations include dual-port arbitration timing (tBDD ≤ 30 ns), battery-backed data retention at 2V (IDT7024L variant), master/slave BUSY flag behavior, and 84-pin PLCC package compatibility with legacy military/industrial backplanes.

Technical Context

The 7024S25J8 implements fully asynchronous dual-port operation with separate address, control, and I/O buses per port, enabling concurrent read/write to any memory location-including simultaneous reads of the same address. Its on-chip arbitration logic resolves port contention via BUSY flag signaling and supports semaphore flag management across both ports using A0–A2 addressing.

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 supports battery backup mode only in the L-version-not applicable to the S-version denoted by "S" in 7024S25J8.

Key Specifications

Pinout & Package

7024S25J8 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 standard JEDEC MO-047A outline. Pin 1 marked by corner notch; pin numbering clockwise from notch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C133-25JC and AS7C34098B-25JC, the 7024S25J8 delivers integrated hardware arbitration-reducing BOM count and eliminating timing-critical external logic-making it uniquely suited for deterministic real-time inter-processor communication.

Availability

7024S25J8 is available at Aetrix Electronics and suitable for real-time inter-processor communication, digital signal processing buffering, and industrial PLC memory expansion requiring stable component supply and long-term obsolescence management.

Supply support for 7024S25J8 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 Electronics in 2019.

The IDT7024 family was designed for high-reliability dual-access memory applications in aerospace, defense, and industrial control-prioritizing deterministic arbitration, TTL compatibility, and legacy package support over density or ultra-low power.

FAQ

What is the maximum operating frequency supported by the 7024S25J8?

The 7024S25J8 does not operate on a clock; its speed is defined by timing parameters. With a 25 ns maximum read cycle time (tRC), it supports sustained random access rates up to 40 MHz (1/25 ns). Actual system throughput depends on address setup (tAS = 0 ns), hold (tOH = 3 ns), and output enable timing (tAOE ≤ 13 ns), all verified under commercial temperature and 5V ±10% supply conditions.

Does the 7024S25J8 support battery backup for data retention?

No-the 7024S25J8 is the "S" (standard power) version and does not support battery backup. Data retention at 2V is exclusive to the "L" (low-power) variant (e.g., 7024L25J8). The 7024S25J8 requires continuous 5V supply for memory retention; loss of VCC results in immediate data loss.

How does the Master/Slave (M/S) pin affect BUSY pin functionality on the 7024S25J8?

When M/S = HIGH, the 7024S25J8 configures as Master: BUSYL becomes an output flag indicating internal port contention, while BUSYR is unused. When M/S = LOW, it configures as Slave: BUSYR becomes an input that must be driven by a Master device's BUSYL, and BUSYL is disabled. This enables hardware handshaking in cascaded configurations without external logic.

Can the 7024S25J8 perform simultaneous read operations on both ports to the same memory address?

Yes-the 7024S25J8 uses true dual-port memory cells that permit concurrent reads from both left and right ports to identical or different addresses. No BUSY assertion occurs during simultaneous reads, and output timing (tAA, tAOE) applies independently per port, enabling lock-free data sharing in symmetric multiprocessing environments.

What package type is used for the 7024S25J8, and is it RoHS compliant?

The 7024S25J8 uses an 84-pin Plastic Leaded Chip Carrier (PLCC) package, per JEDEC MO-047A, with body dimensions ≈ 1.15 in × 1.15 in × 0.17 in. It is a green part (halogen-free, lead-free finish) per IDT's ordering information-fully RoHS compliant and compatible with standard PLCC sockets and reflow profiles.