Renesas 7008L55PF

Overview

IDT7008L55PF from Integrated Device Technology (IDT) is a high-speed 64K × 8 true dual-port static RAM with independent left/right ports, 55 ns maximum access time, TTL-compatible 5 V ±10% supply, and integrated semaphore/arbitration logic for inter-processor communication in real-time embedded systems.

For engineers reviewing the IDT7008L55PF datasheet, IDT7008L55PF pinout, IDT7008L55PF application, or IDT7008L55PF equivalent, key selection considerations include its 55 ns read cycle time, 1 mW typical standby power, Master/Slave BUSY arbitration capability, and support for simultaneous asynchronous access to shared memory without external logic.

Technical Context

The IDT7008L55PF implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port-enabling concurrent read/write operations on the same memory location. Its on-chip arbitration logic resolves contention via BUSY flag assertion based on address match or CE timing, with tAPS = 5 ns priority setup time.

It integrates full hardware semaphore signaling across eight flags (A0–A2), accessible only when CE = VIH and SEM = VIL, and supports interrupt generation via dedicated mailbox addresses (FFFE_H/FFFF_H). All outputs-including BUSY and INT-are non-tri-state totem-pole (push-pull).

Key Specifications

Pinout & Package

Package: 100-pin Thin Quad Flatpack (TQFP), 0.5 mm pitch, RoHS-compliant, body size 14 mm × 14 mm × 1.4 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-55AXC and AS7C364B-55JCIN, the IDT7008L55PF uniquely delivers 5 V native operation, integrated M/S arbitration, and hardware semaphore - reducing BOM count and PCB area in real-time dual-CPU designs.

Availability

IDT7008L55PF is available at Aetrix Electronics and suitable for real-time inter-processor communication, industrial PLC memory expansion, and avionics data concentrator buffer applications requiring stable component supply, long-term lifecycle support, and industrial temperature compliance.

Supply support for IDT7008L55PF 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

Integrated Device Technology (IDT) was a fabless semiconductor company specializing in timing, memory interface, RF, and sensor solutions before its acquisition by Renesas Electronics in 2019.

The IDT7008L55PF belongs to IDT's high-speed dual-port SRAM product line, designed specifically for deterministic, low-latency shared memory in multi-processor embedded systems requiring hardware arbitration and interrupt signaling.

FAQ

What is the maximum access time specification for the IDT7008L55PF?

The IDT7008L55PF has a maximum address access time (tAA) of 55 ns over the full industrial temperature range (–40°C to +85°C). This value is production-tested and guaranteed for both left and right ports under VCC = 5.0 V ±10% and specified AC test conditions. The 55 ns rating applies to read cycles with CE and OE active; write cycle time (tWC) is also 55 ns max.

Does the IDT7008L55PF support true simultaneous read operations from both ports?

Yes, the IDT7008L55PF uses true dual-port SRAM cells that allow concurrent read operations from identical or different memory locations on the left and right ports with no internal contention. Each port has independent address, control, and data paths - enabling fully asynchronous access without performance penalty or arbitration delay for reads.

How does the BUSY arbitration logic function in Master versus Slave configuration on the IDT7008L55PF?

When M/S = VIH (Master), BUSYL and BUSYR are push-pull outputs asserting low to block writes during address contention; when M/S = VIL (Slave), they become inputs that internally inhibit writes when driven low by a Master device. The IDT7008L55PF's BUSY logic resolves conflicts via tAPS = 5 ns setup time and tBDD ≤ 55 ns disable-to-data delay.

What are the power consumption characteristics of the IDT7008L55PF in standby mode?

The IDT7008L55PF achieves 1 µA typical full standby current (ISB3) when both ports are disabled using CMOS-level CE inputs (> VCC − 0.2 V) and all inputs held at valid logic levels. In TTL-level standby (CE = VIH), ISB1 is 20 mA max. This ultra-low 1 µA figure enables energy-sensitive applications like battery-backed industrial controllers.

Can the IDT7008L55PF be used without enabling the semaphore or interrupt features?

Yes - the IDT7008L55PF operates as a standard dual-port SRAM when semaphore (SEM = VIH) and interrupt (FFFE_H/FFFF_H) functions are unused. Addresses FFFE_H and FFFF_H remain fully accessible as regular memory locations, and SEM/INT pins can be tied high or left unconnected without affecting basic read/write functionality.