Renesas 7024S55FB

Overview

7024S55FB from IDT is a high-speed 4K × 16 true dual-port static RAM with independent left/right ports, 55 ns maximum read cycle time, TTL-compatible 5V ±10% supply, and industrial temperature range (–40°C to +85°C). It supports simultaneous asynchronous access, on-chip semaphore signaling, and master/slave cascading for 32-bit+ bus expansion in real-time embedded memory systems.

For engineers reviewing the 7024S55FB datasheet, 7024S55FB pinout, 7024S55FB application, or 7024S55FB equivalent, key selection considerations include BUSY-flag arbitration timing (tBDD ≤ 30 ns), battery-backed data retention at 2V (IDT7024L variant), and 100-pin TQFP package compatibility with multiplexed bus control via separate UBL/LBL and R/WL/R/WR signals.

Technical Context

The 7024S55FB implements fully asynchronous dual-port operation with independent address, control, and I/O buses per port-enabling concurrent reads/writes to the same memory location without contention. Its on-chip arbitration logic resolves port conflicts using BUSY flag assertion and M/S-selectable master/slave mode.

It integrates full hardware semaphore support (8 flags addressed by A0–A2), interrupt flag generation (INTL/INTR), and separate upper- and lower-byte enables (UBL/LBL, UBR/LBR) for byte-level granularity. The device operates in standard TTL voltage levels and supports power-down via CE-driven standby modes with ISB3 ≤ 5 µA (L version) or 15 µA (S version).

Key Specifications

Pinout & Package

7024S55FB is housed in a 100-pin TQFP (PNG100) package measuring 14 mm × 14 mm × 1.4 mm, with exposed thermal pad (not electrically connected). All VCC pins require decoupling to GND; all GND pins must be solidly tied to system ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C024AV-55AXC and AS7C34098B-55TIN, the 7024S55FB uniquely delivers industrial-temperature operation, hardware semaphore support, and M/S-configurable BUSY arbitration - enabling drop-in deployment in safety-critical dual-CPU systems without redesigning arbitration logic.

Availability

7024S55FB is available at Aetrix Electronics and suitable for industrial motion controllers, avionics data buffers, and medical imaging subsystems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 7024S55FB 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 semiconductor company specializing in timing, memory interface, RF, and sensor solutions, now part of Renesas Electronics since 2019.

The IDT7024 family was designed specifically for deterministic, contention-free memory sharing between independent processors or bus masters in real-time embedded systems - emphasizing hardware arbitration, low-latency access, and robust industrial reliability.

FAQ

What is the maximum operating speed of the 7024S55FB?

The 7024S55FB has a maximum read cycle time (tRC) of 55 ns, corresponding to a theoretical peak bandwidth of approximately 18.2 MB/s per port. This rating is guaranteed across the full industrial temperature range (–40°C to +85°C) and 5.0 V ±10% supply, making it suitable for deterministic real-time applications where worst-case timing must be assured.

Does the 7024S55FB support battery backup for data retention?

The 7024S55FB is the "S" (standard power) variant and does not support battery backup. However, its pin-compatible "L" variant (e.g., 7024L55FB) provides data retention at 2 V with ICCDR ≤ 4 mA - confirmed in datasheet Table 10. For battery-backed operation, specify the "L" suffix and ensure VCC ≥ 2.0 V during retention mode.

How does the M/S pin configure master/slave operation in the 7024S55FB?

When M/S = HIGH, the 7024S55FB operates as a master: BUSYL and BUSYR become outputs that assert during port contention. When M/S = LOW, it operates as a slave: BUSYL and BUSYR become inputs, allowing external master devices to control arbitration. This enables seamless cascading of multiple 7024S55FB units for wider data buses without external logic.

Can the 7024S55FB perform simultaneous read operations on both ports to the same address?

Yes - the 7024S55FB uses true dual-port SRAM cells, allowing concurrent reads from identical addresses on left and right ports with no timing penalty or conflict. This capability is fundamental to its use in mirrored buffer or broadcast scenarios, and is explicitly confirmed in the Functional Block Diagram and Features section of the datasheet.

What package type is used for the 7024S55FB?

The 7024S55FB is supplied in a 100-pin Thin Quad Flatpack (TQFP) package, designated PNG100 in IDT documentation. Its dimensions are 14 mm × 14 mm × 1.4 mm with gull-wing leads, optimized for automated SMT assembly and thermal performance in industrial PCB layouts.