Renesas 7024L55GB

Overview

7024L55GB from IDT is a high-speed 4K × 16 true dual-port static RAM with independent left/right ports, 55 ns max read cycle time, TTL-compatible 5V ±10% supply, and 2V data retention capability. It supports simultaneous asynchronous access to the same memory location and implements on-chip semaphore arbitration for inter-processor communication in real-time embedded systems.

For engineers reviewing the 7024L55GB datasheet, 7024L55GB pinout, 7024L55GB application, or 7024L55GB equivalent, key selection criteria include dual-port contention resolution timing (tBDD ≤ 30 ns), low standby current (1 µA typ. in full CMOS standby), battery-backed data retention at 2V, and Master/Slave BUSY flag coordination for cascaded 32-bit+ memory expansion.

Technical Context

The 7024L55GB employs fully asynchronous dual-port architecture with separate address, control, and I/O buses per port, enabling concurrent read/write operations without external arbitration logic. Its on-chip arbitration logic resolves port conflicts via BUSY flag signaling and supports semaphore flag access through dedicated SEM pins and A0–A2 addressing.

It integrates full hardware semaphore signaling across ports using I/O0–I/O15 for flag read/write, with tSWRD = 5 ns write-to-read latency and tSPS = 5 ns contention window. The device operates in commercial/industrial temperature ranges (–40°C to +85°C) and supports battery backup mode with VCC down to 2V while retaining data.

Key Specifications

Pinout & Package

7024L55GB is packaged in a 100-pin Thin Quad Flatpack (TQFP), body size 14 mm × 14 mm × 1.4 mm, lead pitch 0.5 mm. Pinout conforms to IDT's standard dual-port RAM layout with mirrored left/right I/O banks, dedicated semaphore and interrupt flags, and Master/Slave select (M/S).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C136-55JC and AS7C34098B-55TIN, the 7024L55GB delivers integrated hardware arbitration and semaphore management in a single package, reducing system-level complexity and improving determinism in multi-processor designs - critical for industrial control and avionics where timing predictability is mandatory.

Availability

7024L55GB is available at Aetrix Electronics and suitable for industrial PLC communication modules, avionics flight control interfaces, and medical imaging data buffers requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.

Supply support for 7024L55GB 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 family was designed specifically for high-reliability dual-processor and real-time embedded systems requiring deterministic memory sharing, hardware arbitration, and battery-backed data retention - targeting industrial automation, aerospace, and medical instrumentation.

FAQ

What is the maximum operating temperature range for the 7024L55GB?

The 7024L55GB is rated for industrial temperature operation from –40°C to +85°C. This specification is confirmed in the Absolute Maximum Ratings table and DC Electrical Characteristics section of the official IDT datasheet, and applies to all speed grades including the 55 ns variant. It does not support military-grade –55°C to +125°C operation.

Does the 7024L55GB support true simultaneous read operations on both ports to the same memory address?

Yes, the 7024L55GB features true dual-ported memory cells that allow concurrent reads from identical addresses on the left and right ports without conflict or timing penalty. This capability is explicitly stated in the Features section and verified by the functional block diagram showing independent address decoders and I/O control per port.

How does the 7024L55GB implement hardware semaphore signaling between ports?

The 7024L55GB implements hardware semaphores using eight dedicated flag registers addressed by A0–A2 and controlled via SEML/SEMR pins. When SEM is active, I/O0 writes the flag value and all 16 I/O lines read it back. Timing parameters tSWRD = 5 ns and tSPS = 5 ns ensure fast, race-free flag handoff between ports without software intervention.

What is the minimum supply voltage required to retain data in the 7024L55GB during power loss?

The 7024L55GB retains stored data down to 2.0 V (VDR), as specified in Table 10 (Data Retention Characteristics). At this voltage, typical data retention current is 100 µA, and the device maintains valid contents indefinitely as long as VCC remains ≥2.0 V - a key feature of the "L" (low-power) variant used in the 7024L55GB.

Can the 7024L55GB be used in a Master/Slave configuration to expand memory width beyond 16 bits?

Yes, the 7024L55GB supports Master/Slave cascading via the M/S pin: set M/S = H on the Master device to output BUSY, and M/S = L on Slaves to accept BUSY as input. This enables error-free 32-bit or wider word systems without external logic, as documented in the IDT7024 description and functional block diagram.