Renesas 7024S35FB

Overview

7024S35FB from IDT is a high-speed 4K × 16 true dual-port static RAM with independent asynchronous left/right ports, 35 ns maximum read cycle time (tRC), TTL-compatible 5V ±10% supply, and on-chip semaphore arbitration logic-designed for real-time inter-processor communication in embedded control systems.

For engineers reviewing the 7024S35FB datasheet, 7024S35FB pinout, 7024S35FB application, or 7024S35FB equivalent, this device supports simultaneous read/write access to shared memory, battery-backed data retention down to 2V, and master/slave cascading for 32-bit+ bus expansion without external logic.

Technical Context

The 7024S35FB implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port, enabling concurrent access to any memory location-including simultaneous reads of identical addresses. Its on-chip arbitration logic resolves contention via BUSY flag signaling and priority-based semaphore management.

It supports two distinct operational modes: RAM access (CE = VIL, UB/LB = VIL, SEM = VIH) and semaphore register access (CE = VIH or UB&LB = VIH, SEM = VIL), with dedicated timing parameters for each-including tSAA (semaphore address access) and tSWRD (semaphore write-to-read delay).

Key Specifications

Pinout & Package

7024S35FB is packaged in a 100-pin TQFP (PNG100) with 0.5 mm pitch, 14 mm × 14 mm footprint, and 1.4 mm height. Pin assignments follow standard dual-port layout with mirrored left/right I/O, address, and control groups.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C133-35JC and IS61LV25616AL-10TL, the 7024S35FB delivers integrated hardware arbitration, true simultaneous access, and 5V compatibility-reducing BOM count and eliminating timing uncertainty from external logic paths.

Availability

7024S35FB is available at Aetrix Electronics and suitable for industrial PLC communication, avionics data exchange, and medical imaging buffer applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for 7024S35FB 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 7024S35FB belongs to IDT's legacy high-speed dual-port SRAM product line, engineered for deterministic inter-processor communication in real-time embedded systems demanding sub-40 ns latency and hardware-enforced synchronization.

FAQ

What is the maximum operating temperature range for the 7024S35FB?

The 7024S35FB is specified for industrial temperature operation from –40°C to +85°C. This rating is confirmed in the Absolute Maximum Ratings table and DC Electrical Characteristics section of the official datasheet, and applies specifically to the 'S' speed grade variant in the 100-pin TQFP package.

Does the 7024S35FB support battery backup operation, and what voltage is required?

Yes, the 7024S35FB supports battery backup data retention at VCC = 2.0 V minimum, with typical retention current of 100 µA and maximum of 4000 µA across military and industrial grades. This capability is explicitly documented in the Data Retention Characteristics table (Table 10) and waveform Figure 5.

How does the Master/Slave (M/S) pin affect BUSY signal behavior in the 7024S35FB?

When M/S = H (high), BUSY is an output flag indicating port contention; when M/S = L (low), BUSY becomes an input used by slave devices to detect master-initiated arbitration. This dual-role configuration is defined in the Pin Names table and Truth Table I, and enables hierarchical cascading without external logic.

What is the purpose of the SEM (semaphore) pins on the 7024S35FB, and how are they accessed?

The SEML and SEMR pins enable access to eight hardware semaphore flags stored in dedicated registers. These are addressed via A0–A2 and controlled using CE/UB/LB logic levels per Truth Table II. The 7024S35FB uses dedicated SEM control-not general memory mapping-to provide atomic lock/unlock operations between ports.

Can the 7024S35FB be used in a 32-bit data bus configuration, and how is that achieved?

Yes-the 7024S35FB supports 32-bit expansion via Master/Slave cascading: two devices operate in tandem with one configured as master (M/S = H) and the other as slave (M/S = L), using BUSY flag handshaking to coordinate access. This method is explicitly described in the Features section and functional block diagram of the datasheet.