Renesas 7008L20JI8

Overview

IDT7008L20JI8 from Integrated Device Technology (IDT) is a high-speed 64K × 8 true dual-port static RAM with independent left/right ports, 20 ns max access time, TTL-compatible 5V ±10% supply, and integrated semaphore/arbitration logic for inter-processor communication in real-time embedded systems.

For engineers reviewing the IDT7008L20JI8 datasheet, IDT7008L20JI8 pinout, IDT7008L20JI8 application, or IDT7008L20JI8 equivalent, key selection considerations include BUSY flag arbitration timing (tBDD ≤ 20 ns), low standby power (1 mW typ.), industrial temperature support (–40°C to +85°C), and 100-pin TQFP package compatibility with memory coherency protocols.

Technical Context

The IDT7008L20JI8 implements fully asynchronous dual-port operation with separate address, control, and I/O buses per port, enabling simultaneous read/write access to any memory location without contention. Its on-chip hardware supports master/slave configuration via M/S pin, where BUSY acts as output (VIH) or input (VIL) depending on mode.

It integrates dedicated semaphore logic (8 flags addressed by A0–A2), interrupt signaling (INTL/INTR tied to FFFE/FFFF addresses), and port-to-port arbitration using push-pull BUSY outputs with tAPS = 5 ns setup time. All control signals - CE0/CE1, R/W, OE - operate at TTL/CMOS levels with defined VIH/VIL thresholds.

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, RoHS-compliant green variant available.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C136-20JC and AS7C364B-20TIN, the IDT7008L20JI8 uniquely delivers integrated hardware arbitration (BUSY), semaphore flags, and interrupt mailboxes in a single 100-pin TQFP package - reducing BOM count and improving determinism in tightly coupled multi-processor systems.

Availability

IDT7008L20JI8 is available at Aetrix Electronics and suitable for industrial PLC data exchange, dual-CPU real-time control, and telecom line card buffering requiring stable component supply across extended production lifecycles.

Supply support for IDT7008L20JI8 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), now part of Renesas Electronics, is a fabless semiconductor company specializing in timing, memory interface, and RF solutions for communications and computing infrastructure.

The IDT7008L20JI8 belongs to IDT's high-speed dual-port SRAM product line, designed specifically for deterministic inter-processor communication in industrial automation, telecom, and test equipment where hardware-enforced memory coherency is critical.

FAQ

What is the maximum operating temperature range for the IDT7008L20JI8?

The IDT7008L20JI8 is rated for industrial temperature operation from –40°C to +85°C. This specification is validated across all electrical parameters including access time (20 ns max), standby current (0.2 mA typ.), and BUSY arbitration timing (tBDD ≤ 20 ns). The 100-pin TQFP package maintains thermal integrity under sustained load in enclosed enclosures.

Does the IDT7008L20JI8 support true simultaneous read operations on both ports?

Yes, the IDT7008L20JI8 implements true dual-port static RAM cells that allow independent, asynchronous reads from both left and right ports to the same or different memory locations without conflict. No BUSY assertion occurs during concurrent reads, and output timing (tOH, tLZ) remains fully specified per port.

How does the BUSY arbitration logic function in master/slave configuration?

In master mode (M/S = VIH), BUSYL/BUSYR are outputs that assert low when port contention is detected on matching addresses; in slave mode (M/S = VIL), they become inputs that inhibit writes when driven low by the master. The IDT7008L20JI8 uses tAPS = 5 ns setup time to determine arbitration priority, ensuring deterministic resolution without software overhead.

What are the power consumption characteristics of the IDT7008L20JI8 in standby mode?

The IDT7008L20JI8 achieves 0.2 mA typical standby current (ISB3) when both ports are disabled with CMOS-level inputs (CE > VCC − 0.2 V). This ultra-low power state is enabled automatically via CE0/CE1 control and requires no additional sequencing - critical for energy-constrained industrial gateways and remote sensors.

Can the IDT7008L20JI8 be used without enabling the semaphore or interrupt features?

Yes, the IDT7008L20JI8 operates as a standard dual-port SRAM when SEM and INT pins are left unconnected or unused. Address locations FFFE and FFFF function as regular memory cells if interrupts are disabled, and semaphore flags remain inactive unless SEML/SEMR are asserted with CE = VIH. All core memory functionality remains fully available.