Renesas 7005L15PFI8

Overview

7005L15PFI8 from IDT is a high-speed 8K × 8 (64 Kbit) true dual-port static RAM with independent left/right ports, 15 ns max read cycle time (tRC), TTL-compatible 5 V ±10% supply, 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+ bus expansion in real-time inter-processor communication systems.

For engineers reviewing the 7005L15PFI8 datasheet, 7005L15PFI8 pinout, 7005L15PFI8 application, or 7005L15PFI8 equivalent, key selection criteria include its 15 ns access timing, low-power active/standby current (700 mW / 1 mW typ.), on-chip semaphore and interrupt logic, BUSY arbitration, and TQFP-64 packaging for space-constrained embedded control designs.

Technical Context

The 7005L15PFI8 implements fully asynchronous dual-port operation with separate address, data, and control buses per port (A0L–A12L/I/O0L–I/O7L/R/WL/CEL/OEL/BUSYL/INTL/SEML on left; symmetric right-side signals). Its on-chip arbitration logic resolves port contention via BUSY flag assertion-either CE-controlled or address-match–triggered-with priority set-up time (tAPS = 5 ns) ensuring deterministic resolution.

It integrates full hardware semaphore support (8 flags addressed by A0–A2), interrupt generation (INTL/INTR) triggered by write to specific addresses (e.g., 1FFE_H sets INTL), and battery backup capability (2 V data retention). The device uses CMOS process for low power and withstands >2001 V ESD, with all I/Os TTL-compatible and push-pull BUSY/INT outputs.

Key Specifications

Pinout & Package

7005L15PFI8 is housed in a 64-pin TQFP (PNG64) package with 0.5 mm pitch, body size 14 mm × 14 mm × 1.4 mm. All VCC pins require local decoupling; all GND pins must be connected to system ground plane for signal integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C024AV-15AXC and IDT70V25L15PF, the 7005L15PFI8 uniquely delivers 5 V TTL compatibility, industrial temperature rating, and drop-in replaceability in legacy dual-port memory sockets - critical for cost-sensitive retrofit programs where board re-spin is prohibited.

Availability

7005L15PFI8 is available at Aetrix Electronics and suitable for real-time inter-processor communication, industrial PLC memory expansion, and avionics data logging requiring stable component supply across extended production lifecycles.

Supply support for 7005L15PFI8 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, and RF solutions, acquired by Renesas in 2019.

The IDT7005 family was designed specifically for deterministic, low-latency shared memory in dual-processor systems - emphasizing hardware arbitration, semaphore support, and industrial reliability over generic SRAM performance.

FAQ

What is the maximum operating frequency supported by the 7005L15PFI8?

The 7005L15PFI8 does not operate at a fixed clock frequency but supports asynchronous access with a maximum read cycle time (tRC) of 15 ns. This corresponds to a theoretical peak throughput of 66.7 million reads per second per port. Actual system bandwidth depends on address/data setup/hold timing and bus protocol overhead - the 7005L15PFI8 datasheet specifies tAA ≤ 15 ns and tACE ≤ 15 ns under commercial conditions, confirming its suitability for high-speed burst transfers in real-time control loops.

Does the 7005L15PFI8 support battery backup operation, and what voltage is required?

Yes, the 7005L15PFI8 supports battery backup operation with guaranteed data retention at VCC = 2.0 V, as specified in Table 9 of the datasheet. This low-voltage retention mode draws ≤4000 µA (max) in military grade, enabling long-term memory preservation during main power loss. The device automatically enters retention mode when VCC drops below the threshold while CE remains asserted, making it ideal for flight data recorders and industrial black-box loggers requiring fail-safe storage.

How does the BUSY arbitration logic work between the left and right ports of the 7005L15PFI8?

The 7005L15PFI8 implements hardware BUSY arbitration using either CE-controlled or address-match–triggered methods. When M/S = H (master), BUSYL/BUSYR are outputs that assert LOW to block conflicting writes. Priority is determined by tAPS = 5 ns setup time: the port whose address and enable signals stabilize first wins arbitration. If tAPS is violated, arbitration becomes indeterminate. As a slave (M/S = L), BUSY inputs inhibit writes - ensuring deterministic conflict resolution without external logic in multi-device configurations.

Can the 7005L15PFI8 be used in a MASTER/SLAVE configuration, and how is it implemented?

Yes, the 7005L15PFI8 supports MASTER/SLAVE cascading via the M/S pin. When M/S = H, BUSY signals are outputs; when M/S = L, they become inputs. In a two-device system, one is configured as master (driving BUSY) and the other as slave (receiving BUSY), enabling seamless 16-bit data bus expansion without additional glue logic. The datasheet confirms this topology supports "full-speed, error-free operation" in 16-bit-or-more word systems, with pin-to-pin compatibility across the IDT7005 family simplifying layout reuse.

What are the key differences between the 'S' and 'L' versions of the IDT7005, and why choose the 7005L15PFI8?

The 'S' version (e.g., 7005S15PFI8) has higher active power (750 mW typ.) and standby current (5 mW typ.), while the 'L' version (7005L15PFI8) reduces these to 700 mW and 1 mW respectively - a 80% standby reduction. The 'L' variant also enables battery backup operation at 2 V, which the 'S' version does not support. Choose 7005L15PFI8 for industrial applications demanding extended low-power operation, fail-safe data retention, and thermal efficiency in enclosed enclosures.