Renesas 7008L35G

Overview

IDT7008L35G from Integrated Device Technology (IDT) is a high-speed 64K × 8 true dual-ported static RAM with independent left/right ports, 35 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 IDT7008L35G datasheet, IDT7008L35G pinout, IDT7008L35G application, or IDT7008L35G equivalent, key selection considerations include BUSY flag arbitration timing (tBDD ≤ 35 ns), low standby power (1 mW typ.), dual chip enables per port, M/S master/slave cascading capability, and industrial temperature support (–40°C to +85°C).

Technical Context

The IDT7008L35G implements fully asynchronous dual-port operation with separate address, control, and I/O buses for left and right ports-enabling simultaneous read/write access to any memory location. Its on-chip arbitration logic uses push-pull BUSY outputs (not tri-state) and supports both address-match and CE-controlled BUSY assertion modes.

It integrates eight hardware semaphores addressed via A0–A2, accessed only when CE = VIH and SEM = VIL, with write-to-I/O0/read-from-all-I/Os protocol. Interrupt flags (INTL/INTR) are triggered by writes to dedicated mailbox addresses (FFFE_H/FFFF_H) and cleared by corresponding reads.

Key Specifications

Pinout & Package

Package: 100-pin Thin Quad Flatpack (TQFP), body size ≈ 14 mm × 14 mm × 1.4 mm; RoHS-compliant, green part option available.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-35AXC and AS7C36256P-35JC, the IDT7008L35G uniquely delivers 64K × 8 density with integrated hardware arbitration, 5 V simplicity, and M/S-configurable cascading - making it optimal for cost-sensitive, real-time embedded systems where deterministic inter-processor communication is mandatory.

Availability

IDT7008L35G is available at Aetrix Electronics and suitable for motor control systems, industrial PLCs, avionics data concentrators, and medical imaging subsystems requiring stable component supply with guaranteed long-term availability.

Supply support for IDT7008L35G 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) is a fabless semiconductor company specializing in timing, memory interface, RF, and sensor signal conditioning solutions for communications, computing, and industrial markets.

The IDT7008L35G belongs to IDT's high-speed dual-port SRAM product line, designed specifically for real-time embedded systems requiring deterministic inter-processor communication, low-latency shared memory, and industrial-grade reliability.

FAQ

What is the maximum operating temperature range certified for the IDT7008L35G?

The IDT7008L35G is specified for industrial temperature operation from –40°C to +85°C. This rating is verified across all electrical parameters including 35 ns access time, BUSY arbitration timing (tBDD ≤ 35 ns), and standby current (ISB3 ≤ 0.2 mA). It is not qualified for commercial-only grades (0°C to +70°C).

How does the M/S pin affect BUSY pin functionality in the IDT7008L35G?

When M/S = VIH, the IDT7008L35G operates as a Master: BUSYL and BUSYR become push-pull outputs that assert during port contention. When M/S = VIL, it operates as a Slave: BUSYL and BUSYR become inputs that must be driven externally to inhibit writes - enabling hardware-synchronized multi-device configurations without external logic.

Can the IDT7008L35G support 16-bit data bus expansion, and how is it implemented?

Yes, the IDT7008L35G supports 16-bit expansion using its MASTER/SLAVE architecture. Two devices are cascaded with M/S = VIH on the master and M/S = VIL on the slave. The master's BUSY outputs drive the slave's BUSY inputs, enabling full-speed, error-free 16-bit operation without external arbitration logic or timing compensation.

What are the power consumption characteristics of the IDT7008L35G in standby mode?

In full standby (ISB3), with both ports disabled using CMOS-level inputs (CE > VCC − 0.2 V), the IDT7008L35G consumes 0.2 mA typical (1 mW at 5 V). With TTL-level inputs (ISB1), it draws 30 mA typical. The dual CE0/CE1 structure allows selective port shutdown - e.g., ISB4 = 80 mA typical when one port is active and the other is in CMOS standby.

How are interrupt flags (INTL/INTR) generated and cleared in the IDT7008L35G?

INTL asserts when the right port writes to address FFFE_H; INTR asserts when the left port writes to FFFF_H. Both flags clear automatically upon reading their respective mailbox addresses. Initialization requires power-up reset of INTL/INTR lines, and operation depends on proper CE/OE/R/W sequencing per Truth Table IV in the IDT7008L35G datasheet.