Renesas 7008L20JGI

Overview

IDT7008L20JGI from Integrated Device Technology (IDT) is a high-speed 64K × 8 true dual-ported static RAM with independent left/right ports, 20 ns max access time, TTL-compatible 5V ±10% operation, and integrated semaphore/arbitration logic for inter-processor communication in real-time embedded systems.

For engineers reviewing the IDT7008L20JGI datasheet, IDT7008L20JGI pinout, IDT7008L20JGI application, or IDT7008L20JGI equivalent, key selection criteria include BUSY flag arbitration timing (tBDD ≤ 20 ns), low standby power (1 mW typ.), Master/Slave cascading support via M/S pin, and industrial temperature range (–40°C to +85°C) compliance.

Technical Context

The IDT7008L20JGI implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port-enabling simultaneous read/write operations to the same memory location without contention. Its on-chip arbitration logic resolves port conflicts using BUSY flag assertion based on address match or CE timing, with tAPS = 5 ns priority setup.

It supports semaphore signaling across eight flags (A0–A2 addressed), interrupt generation via dedicated mailbox addresses (FFFEH/FFFFH), and automatic power-down via dual chip enables (CE0/CE1). The device operates exclusively at 5V ±10% with push-pull BUSY/INT outputs and non-tri-state output drivers.

Key Specifications

Pinout & Package

Package: 100-pin Thin Quad Flatpack (TQFP), body size ≈ 14 mm × 14 mm × 1.4 mm, lead pitch 0.5 mm, exposed thermal pad (GND-connected).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-20AC and R1EX24064AS0I#U0, the IDT7008L20JGI uniquely delivers true dual-port parallel access, hardware semaphore support, and 20 ns industrial-grade timing in a single 5V device-making it irreplaceable for deterministic inter-processor communication.

Availability

IDT7008L20JGI is available at Aetrix Electronics and suitable for industrial motion control, avionics data acquisition, real-time inter-processor communication, and digital signal processing co-processing requiring stable component supply across extended temperature ranges.

Supply support for IDT7008L20JGI 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 signal conditioning solutions before its acquisition by Renesas Electronics in 2019.

The IDT7008L20JGI belongs to IDT's high-speed dual-port SRAM product line, designed specifically for deterministic, low-latency inter-processor communication in industrial, aerospace, and telecom infrastructure systems.

FAQ

What is the operating voltage range for the IDT7008L20JGI?

The IDT7008L20JGI operates at a nominal supply voltage of 5.0 V with a tolerance of ±10%, meaning it functions reliably from 4.5 V to 5.5 V. This TTL-compatible voltage range eliminates the need for level shifters when interfacing with legacy 5V microcontrollers, FPGAs, or peripheral ICs. All DC electrical characteristics-including VIH, VIL, VOL, and VOH-are specified within this range and validated across the full industrial temperature span (–40°C to +85°C).

How does the BUSY arbitration logic work in the IDT7008L20JGI?

The IDT7008L20JGI implements hardware-based BUSY arbitration using either address-match detection or CE timing control. When both ports attempt simultaneous writes to the same address, the BUSY flag (BUSYL or BUSYR) asserts within tBAA ≤ 20 ns to block the later port. The M/S pin configures the device as Master (BUSY outputs) or Slave (BUSY inputs), enabling cascaded multi-device systems. Critically, tAPS = 5 ns ensures deterministic priority resolution-no software polling or delay loops required.

Can the IDT7008L20JGI be used in Master/Slave configurations for 16-bit data buses?

Yes-the IDT7008L20JGI supports seamless Master/Slave cascading via the M/S pin to build 16-bit or wider memory systems. When configured as Master (M/S = VIH), BUSY signals act as outputs to coordinate timing; as Slave (M/S = VIL), they become inputs that inhibit local writes. This architecture allows multiple IDT7008L20JGI devices to operate in lockstep without external arbitration logic, maintaining full-speed error-free operation across expanded data widths.

What is the purpose of the semaphore function in the IDT7008L20JGI?

The IDT7008L20JGI integrates eight hardware semaphore flags, accessed via A0–A2 and controlled by SEML/SEMR. These flags enable atomic resource locking between processors-e.g., one port writes "0" to claim a flag, the other reads it to check availability. Unlike software semaphores, this hardware implementation requires no CPU cycles, avoids race conditions, and guarantees consistency even during power transitions. Semaphore access occurs independently of main RAM, using dedicated CE/SEM control per port.

Does the IDT7008L20JGI support interrupt generation, and how is it implemented?

Yes-the IDT7008L20JGI provides dedicated interrupt flags (INTL and INTR) triggered by writes to mailbox addresses FFFEh (left port interrupt) and FFFFh (right port interrupt). When the right port writes to FFFEh, INTL asserts; the left port clears it by reading FFFEh. Similarly, INTR is set by left-port writes to FFFFh and cleared by right-port reads. Both flags are push-pull outputs requiring power-up initialization, and their timing (tINS/tINR ≤ 20 ns) ensures responsive event notification in hard real-time systems.