Renesas 7005L35JI8

Overview

7005L35JI8 from IDT is a high-speed 8K × 8 dual-port static RAM with true independent left/right ports, 35 ns maximum read cycle time (tRC), 2 V data retention capability, and industrial temperature range (–40°C to +85°C). It enables simultaneous asynchronous access to the same memory location and supports master/slave cascading for 16-bit+ systems in real-time control and communications buffers.

For engineers reviewing the 7005L35JI8 datasheet, 7005L35JI8 pinout, 7005L35JI8 application, or 7005L35JI8 equivalent, key selection criteria include BUSY arbitration timing (tBDD ≤ 35 ns), semaphore flag support (8 flags via A0–A2), low standby current (1 mA typ.), and TQFP-64 packaging compatibility with PCB layout constraints.

Technical Context

The 7005L35JI8 implements fully asynchronous dual-port operation with separate address, control, and I/O buses per port. Its on-chip arbitration logic resolves contention using either chip-enable (CE) or address-match priority, with tAPS = 5 ns setup time ensuring deterministic BUSY assertion.

It integrates full hardware semaphore signaling (SEML/SEMR) and interrupt generation (INTL/INTR) with dedicated flag addresses (e.g., 1FFF_H sets INTR). The device uses CMOS process technology and supports battery backup via 2 V VCC retention mode with ICCDR ≤ 4000 µA across military/industrial grades.

Key Specifications

Pinout & Package

64-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 CY7C028V-35AXC and AS7C38097A-35TCN, the 7005L35JI8 uniquely combines industrial temperature operation, integrated semaphore logic, and 2 V data retention in a compact 64-pin TQFP-making it optimal for ruggedized embedded systems requiring robust inter-processor coordination without external logic.

Availability

7005L35JI8 is available at Aetrix Electronics and suitable for industrial automation, avionics data exchange, telecom line card buffering, and real-time control systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 7005L35JI8 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, RF, and sensor solutions, now part of Renesas Electronics since 2019.

The IDT7005 product line was designed specifically for deterministic, low-latency inter-processor communication in real-time embedded systems-emphasizing hardware arbitration, semaphore signaling, and battery-backed data integrity.

FAQ

What is the maximum operating temperature range supported by the 7005L35JI8?

The 7005L35JI8 is rated for industrial temperature operation from –40°C to +85°C. This specification is confirmed in the "Maximum Operating Temperature and Supply Voltage" table and applies to all speed grades including the 35 ns version. It is not rated for military-grade (–55°C to +125°C) operation, which requires distinct part numbering (e.g., 7005L35JQI).

Does the 7005L35JI8 support true simultaneous read access to the same memory location from both ports?

Yes, the 7005L35JI8 features true dual-ported memory cells that permit simultaneous reads of the same address from left and right ports without contention or arbitration delay. This capability is explicitly stated in the "Features" section and verified by the functional block diagram showing independent I/O control paths for each port.

How does the BUSY arbitration logic function in master/slave configuration for the 7005L35JI8?

When M/S = H (master), BUSYL and BUSYR are push-pull outputs asserting during port-to-port contention; when M/S = L (slave), they become inputs that inhibit writes upon assertion. The 7005L35JI8 implements two arbitration modes: CE-controlled (tBAC/tBDC) and address-match (tBAA/tBDA), both with tAPS = 5 ns priority setup time.

What is the data retention voltage requirement for the 7005L35JI8, and how is it implemented?

The 7005L35JI8 supports data retention at VCC ≥ 2.0 V, as specified in Table 9 ("Data Retention Characteristics"). This is achieved via internal circuitry that maintains SRAM cell state during brown-out or battery-backup operation, with ICCDR ≤ 4000 µA at 2 V - eliminating need for external retention capacitors or regulators.

Can the 7005L35JI8 be used in a 16-bit data path system, and if so, how?

Yes, the 7005L35JI8 supports 16-bit expansion via master/slave cascading. One device operates as master (M/S = H) and another as slave (M/S = L); the BUSY outputs of the master drive BUSY inputs of the slave, enabling synchronized 16-bit access without external logic. This method is documented in the "Description" section and functional block diagram.