Renesas 7005L35PFI

Overview

7005L35PFI from IDT is a high-speed 8K × 8 (64 Kbit) dual-port static RAM with true independent left/right ports, 35 ns max read cycle time, TTL-compatible 5V ±10% supply, and industrial temperature range (–40°C to +85°C). It supports simultaneous asynchronous access, on-chip semaphore arbitration, and battery backup data retention down to 2V.

For engineers reviewing the 7005L35PFI datasheet, 7005L35PFI pinout, 7005L35PFI application, or 7005L35PFI equivalent, this device is selected for real-time inter-processor communication, shared memory in redundant control systems, and high-reliability embedded data buffering where port contention management and deterministic BUSY/INT signaling are critical.

Technical Context

The 7005L35PFI implements fully asynchronous dual-port architecture with separate address, data, and control buses per port (A0L–A12L/I/O0L–I/O7L vs. A0R–A12R/I/O0R–I/O7R), enabling concurrent reads/writes without internal arbitration delay. Its hardware semaphore logic uses A0–A2 to select among eight flags, accessed via dedicated SEM/CE polarity inversion.

Port arbitration is implemented via push-pull BUSY outputs (M/S = H) or inputs (M/S = L), with tAPS = 5 ns priority setup time and tBDD ≤ 35 ns disable-to-valid-data delay. Interrupts are edge-triggered and cleared by specific address writes (e.g., 1FFE_H resets INTL), requiring no external logic for inter-port signaling.

Key Specifications

Pinout & Package

7005L35PFI is housed in a 64-pin TQFP (PNG64) package with 0.5 mm pitch, thermally enhanced for industrial ambient operation. Pin functions are strictly segregated per port, with no shared address or data lines between left and right sides.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-35AC and IS61LV5128-35TLI, the 7005L35PFI delivers integrated hardware arbitration, semaphore, and interrupt support in a compact TQFP - reducing BOM count by ≥3 discrete ICs and eliminating timing-critical PCB routing for arbitration signals.

Availability

7005L35PFI is available at Aetrix Electronics and suitable for real-time inter-processor communication, redundant control system memory, and industrial Ethernet gateway buffering requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 7005L35PFI 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 high-performance timing, memory, and interface solutions, now part of Renesas Electronics.

The IDT7005 family was designed specifically for deterministic, low-latency shared-memory architectures in aerospace, industrial automation, and telecom infrastructure - prioritizing hardware arbitration integrity over raw density or cost.

FAQ

What is the maximum operating temperature range for the 7005L35PFI?

The 7005L35PFI is rated for industrial temperature operation from –40°C to +85°C. This range is explicitly confirmed in the datasheet's "Maximum Operating Temperature and Supply Voltage" table and applies to all speed grades including the 35 ns variant. It is not rated for commercial (0°C to +70°C) or military (–55°C to +125°C) extremes.

Does the 7005L35PFI support true simultaneous read operations on both ports to the same memory location?

Yes, the 7005L35PFI implements true dual-ported memory cells that allow simultaneous reads from the same address on left and right ports without contention or delay. This is explicitly stated in the "Features" section and verified by the "Truth Table I" showing non-contention read modes with CE and OE asserted independently per port.

How does the M/S pin affect BUSY signal behavior in the 7005L35PFI?

When M/S = H (high), BUSYL and BUSYR are push-pull outputs indicating port contention status; when M/S = L (low), they become inputs accepting BUSY signals from a master device. This configuration enables cascaded master/slave topologies for 16-bit+ word systems, as documented in the functional description and pin table notes.

What voltage is required for data retention in the 7005L35PFI, and what is the associated current draw?

The 7005L35PFI retains data at VCC = 2.0 V minimum, with data retention current (ICCDR) ranging from 100 µA typical to 4000 µA maximum across military and industrial temperature ranges. This 2V capability is exclusive to the "L" (low-power) version and is validated in Table 9 of the datasheet.

Can the 7005L35PFI be used without external arbitration logic in a dual-processor system?

Yes - the 7005L35PFI includes full on-chip hardware arbitration via BUSY signaling, semaphore registers, and interrupt flags. No external logic is needed for basic contention resolution or inter-processor synchronization, as confirmed by the "On-chip port arbitration logic" feature and timing waveforms showing automatic BUSY assertion during address match.