Renesas 7024S25GB

Overview

7024S25GB from IDT is a high-speed 4K × 16 true dual-port static RAM with independent left/right ports, 25 ns maximum read cycle time (tRC), 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 7024S25GB datasheet, 7024S25GB pinout, 7024S25GB application, or 7024S25GB equivalent, key selection criteria include dual-port arbitration timing (tAPS = 5 ns), BUSY flag behavior under contention (tBDD ≤ 30 ns), battery-backed data retention at 2V (IDT7024L variant), and compatibility with 84-pin PGA, PLCC, Flatpack, or 100-pin TQFP footprints.

Technical Context

The 7024S25GB implements full hardware port arbitration with dedicated BUSY output (MASTER) / BUSY input (SLAVE) signaling and eight fully supported semaphore flags accessed via A0–A2. Its dual independent address/data/control buses allow concurrent reads/writes without external logic.

It features separate upper-byte (UB/UBR) and lower-byte (LB/LBR) enables for multiplexed bus compatibility, and supports both RAM access (SEM = VIH) and semaphore register access (SEM = VIL) using shared I/O pins - all operating fully asynchronously from either port.

Key Specifications

Pinout & Package

7024S25GB is packaged in an 84-pin Plastic Leaded Chip Carrier (PLCC), with 42 pins per side, body size ≈ 1.15 in × 1.15 in × 0.17 in. All VCC and GND pins must be connected per datasheet note.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C024AV-25AXC and IDT70V24S25PF, the 7024S25GB uniquely supports native 5V operation, hardware MASTER/SLAVE expansion via M/S pin, and industrial temperature range in PLCC - making it the only drop-in replacement for legacy 5V dual-processor systems requiring guaranteed BUSY arbitration timing.

Availability

7024S25GB is available at Aetrix Electronics and suitable for industrial PLCs, avionics controllers, and telecom line cards requiring stable component supply, long-lifecycle support, and verified dual-port arbitration behavior.

Supply support for 7024S25GB 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 high-performance silicon solutions, now part of Renesas Electronics.

The IDT7024 family was designed specifically for real-time embedded systems requiring deterministic interprocessor communication - delivering hardware-enforced memory coherency without software overhead.

FAQ

What is the maximum operating frequency supported by the 7024S25GB?

The 7024S25GB has a maximum read cycle time (tRC) of 25 ns, corresponding to a theoretical maximum operating frequency of 40 MHz for continuous sequential access. However, actual system frequency depends on address setup/hold times, bus turnaround, and arbitration overhead - typical sustained throughput is ~30–35 MHz in well-designed 5V bus interfaces.

Does the 7024S25GB support battery backup operation?

The 7024S25GB is the "S" (standard power) variant and supports data retention down to 2V, but it is not characterized or guaranteed for long-term battery backup operation. For certified battery-backed retention, the "L" variant (e.g., 7024L25GB) is specified with 100–4000 µA retention current at 2V and is recommended for applications requiring guaranteed 2V data hold.

How does the M/S pin affect BUSY signal behavior in the 7024S25GB?

In the 7024S25GB, the M/S pin configures BUSY functionality: when M/S = HIGH, BUSYL/BUSYR operate as open-drain push-pull outputs indicating port contention; when M/S = LOW, they become inputs for slave devices in MASTER/SLAVE cascades. This enables automatic hardware arbitration across multiple 7024S25GB devices without external logic.

Can the 7024S25GB perform simultaneous read operations from both ports to the same memory address?

Yes - the 7024S25GB uses true dual-ported memory cells that permit simultaneous reads from both left and right ports to identical addresses without conflict, delay, or data corruption. This capability is fundamental to its use in lock-free interprocessor communication and real-time frame buffering applications.

What package type is used for the 7024S25GB part number?

7024S25GB is supplied in an 84-pin Plastic Leaded Chip Carrier (PLCC) package, with dimensions approximately 1.15 in × 1.15 in × 0.17 in. Pin compatibility is maintained across IDT7024 variants in PLCC, PGA, Flatpack, and TQFP packages - though footprint and thermal characteristics differ.